A City For Promoting Sustainable Environment An Environmental Sciences Essay Example

A City For Promoting Sustainable Environment An Environmental Sciences Essay Introduction Hammarby Sjostad is really ambitious lodging undertaking in Stockholm and regarded as the environment friendly solution of Sweden. This is one of the best and outstanding developments towards sustainability in the universe. In Hammarby Sjostad plans integrated with eco/cycle theoretical account and environmental plan facet. The ends of the Hammarby development undertaking is to cut down entire impact on the environmental facets by half compared to similar developed metropoliss and besides recycling all waste H2O and waste merchandises into renewable energy beginning ( Pruitt, 2009 ) . Purposes and aims This survey is aimed to obtain practical cognition about sustainable engineering and development with different systems of energy and stuff flow advancing sustainable environment. Location and Population This topographic point is located in Sodertalje Kommun of Stockholms Lan in Sweden. It is situated in the geographical co-ordinates between 59AÂ ° 17 0 North and 17AÂ ° 27 0 East. The country consists of about 250 hectares of land. The Hammarby Sjostad has planned to supply 11,000 residential units for 25,000 people. A entire 35,000 people will remain for life and working intent in the country. Stockholm City Council, Fortum, Stockholm Water Company and Stockhom Waste direction Authority plans together to construct this metropolis with defferent developers. History of the metropolis We will write a custom essay sample on A City For Promoting Sustainable Environment An Environmental Sciences specifically for you for only $16.38 $13.9/page Order now We will write a custom essay sample on A City For Promoting Sustainable Environment An Environmental Sciences specifically for you FOR ONLY $16.38 $13.9/page Hire Writer We will write a custom essay sample on A City For Promoting Sustainable Environment An Environmental Sciences specifically for you FOR ONLY $16.38 $13.9/page Hire Writer The Hammarby country was first built due to the demand of developing an industrial country in 1917. In that clip little and some big graduated table industries were established with the seaport activities. Both the seaport activities and unplanned industries caused to high pollution and contaminated country. During the 1990s, the turning demand of lodging required to do a reestablishment of this metropolis for a new residential development. Still that clip the concerns were thriving. After holding several programs with different settled companies, in 1996 and 1997 the initial program was changed to back up for command for Olympic Games 2004 host metropolis. For this intent and ambitious end was set undermentioned twice ( dual ) as good . Unfortunately Stockholm was unable to be host metropolis for Olympic Games. But it was a good enterprise for be aftering Hammarby metropolis and the environmental end and developing a sustainable metropolis program was kept and further redeveloped. The initial mark to construct this edifice to do certain comfy lodging with lake position sight, beautiful natural landscape and recreational topographic points, good communicated route and transit system near to the Central Stockholm. Until today half of the metropolis is developed and the whole undertaking will be complete within 2016. Methodology The methodological analysis of the survey contains three facets: A field survey to the Hammarby sjostad territory A field visit was carried out in 14 September, 2010 at Hammarby Sjostad. An debut talk was organized by the infocenter GlasshusETT . The talk was focused on the history, development and different be aftering scenario of sustaianblity of the territory. There was a field visit with group after the talk to see the different system of the Hammarby Model practically. Group treatment As the undertaking work is divided into different groups, different undertakings were distributed among the group members and organize all together to finalise the study. There were several group meetings were arranged prior to subject this study. Literature Review The whole instance survey was carried out by the supplied reading stuffs. Besides library plants with relevant field provide particular cognition about sustainable environment and metropolis planning. Internet beginnings besides play a critical function for informations and information aggregation. Questions Review Environmental Aspects of the Hammarby Sjostad The methodological analysis to specify the most of import factors, are based on the urban ecosystem appraisal. The urban ecosystems satisfy human demands by moving as a beginning for resources and a sink for waste ( Meirong et al, 2010 ) . As ecosystem, to a big extent, the most of import environmental facets of the Hammarby Sjostad territory are the waste, energy and H2O system. The precedence list is given below: Waste as resource: Presents wastes are considered as resources if it managed and followed by environmental solutions. In hammarby Sjostad waste Eco-friendly energy District warming and colling system chiefly gets energy from the production of domestic wastes. Solar cells, solar panels and fuel cells installed to supply the energy required for public country. Less H2O cleansing agent sewerage The initial end of the Hammarby Sjostad is to cut down H2O ingestion by 50 % . Eco-friendly installing with ingestion degree of H2O makes it different by cut downing the emphasis of H2O demand burden. Cleaner sewerage is treated and reused on agricultural land. Biogas from sewerage sludge is produced. Storm H2O of street ensures decontamination rate as it treated locally and so dispatch into Hammarby sjo . Green roofs with sedum workss adsorb rain H2O without blending it to the lake. Eco-design and building stuff The design of the edifice substructure and its building stuffs are healthy and environment friendly. Transpotation system Well communicating system through ferry, SL coach, and ropeway system has connected with the major countries of the metropolis with the cardinal Stockholm. Private vehicle auto pool system and broad rhythm lane and foot way plays an of import function to cut down green house gas. Balanced ecosystem To hold a balanced ecosystem, there are two ecoducts are installed covering with flora. Reserve forest and diversion topographic point The Parkss and forest in the metropolis besides plays an of import function of the urban system for following ground: The wood and Parkss serve as pathwaies for occupants, but besides for corridor for animate beings and workss. Green infinite could be compensated for in signifier of biotopes that benefit the biological diverseness in the immediate country. Energy Beginnings of the Hammarby Several sorts of energy are used in Hammarby metropolis country: electricity, heat, fuel. The electricity is provided both by the national grid and by the Hogdalen s combined heat and power works. The electricity of the grid comes from outside of the territory. The fuel beginning of the power works is combustible waste. Those wastes are composed by nutrient, packaging and paper waste. The heat usage in the territory warming comes from the Hammarby heat works and the Hogdalen works. The Hammarby heat works is powered by the biofuel produced by the organic waste and the H2O waste of the territory. The warming system for the full Hammarby country is supplied from 2 beginnings: Energy recovery from waste incineration Energy recovery from waste H2O intervention procedure Energy beginning in: Hogdalan heat and power works. Hammarby heat works Biofuel from nature Solar energy Drinking H2O plant/ lake Malaren Sjostaden s and Henriksdal s waste H2O intervention works Energy beginning out: electric / biogas vehicles Purified waste H2O to the sea Treated storm H2O through lake Hammarby Sjo Different System Borders within the Flow Model The Hammarby theoretical account defines different system boundary lines through it differnt material flow. The three chief systems contain and command all these flow. These are describes below: Energy system Biofuel from nature is converted into territory warming and electricity District warming system and electricity is converted from combustible waste Treated effluent converted into territory warming and electricity Solar energy is converted into electrical energy and heating H2O. Water and Sewage system Biogas is produced from the sewerage sludge Residual from biogas production, the biosolids is used for agribusiness as fertiliser Rain from roofs either adsorbs by green roofs or drained into Hammarby Sjo Storm H2O from street is treated and so drained into Hammarby Sjo . Lake Malaren provides the supply H2O of the territory. Waste system Auomatic waste disposal system is installed Combustible waste is converted into warming and electricity of the territory Biosolids are produced from organic wastes and used as fertiliser All reclaimable stuffs are recycled. The energy system of the hammarby theoretical account is truly a good illustration for advancing sustainability and likely the best system. For each individual item utilizations of energy is conserdered for the user ingestion. Producing of heat and electricity from the combustible wastes is of import which can cut down the emphasis of demand of the electricity supply. Biofuel is used for warming and electricity intent every bit good as fuel in public conveyance. Solar energy is besides introduced for energy production though it is non suited with the Swedish clime status and expensive procedure. But the attempt for using every individual advantage from the nature without haltering environment provides the metropolis excess ordinary value for energy ingestion facets. All the electricity is considered as Good environmental pick labeled and eco-friendly. The waste and H2O system is besides of import and has similar direction in other developed metropoliss but the energy ingestion and f low system of Hammarby territory makes itself distinguishable and function theoretical account for others. Energy Consumption To cipher the full energy ingestion of the territory, it is necessary to place all the energy entities and its consumer such as house, office, conveyance etc. Then it is calculated the measure of energy ( electricity, heat, Sun radiation, waste, nutrient, fuel ) for all the entities devouring. Another manner is merely to see the energy come ining through the boundary line of the territory but making this the energy coming from interior beginnings ( or energy transmutation ) of the territory will be omitted. But this energy is besides consumed. To hold the largest attack the energy used to construct and level the territory must besides been taken in history. The energy ingestion end within 2015 was fixed during the clip of the rebuilt of Hammarby Sjostad. Table 1. Energy Consumption Goal Set Energy Use Kwh / M2 Heating A ; electricity, initial end ( 2000 ) 60 Heating A ; electricity, updated end ( 2005 ) 100 Achieved warming A ; electric, best 2006 ordinances for new edifice ( BBR ) , end 110 ( Beginning: www.secureproject.org ) The high energy marks did non carry through its end. The measuring informations is non available to the populace. For the H2O ingestion, the chief mark was set to entree 100 l/person/ twenty-four hours and during the period from July 2006 to July 2007, the mean ingestion was 141,9 l/person/day. Though the end was non achieved still it was better than other country while in Stockholm on mean ingestion is 200 l/ person/day ( www.secureproject.org ) . The initial ends for energy were set to 60 KWh/m2 which was updated to 100 KWh/m2 in 2005 ( Table 1 ) . Biogas merchandises, RES and reuse of waste heat coupled with energy ingestion expeditiously in edifices. About 23000 dozenss sludge treated with the production of 3,500,000 M3 biogas ( www.hammarbysjostad.se/glashusett ) . The best public presentation was achieved so far from two multifamily constructing blocks, holmen and Grynnan, where PV cells were installed in frontages, balconies and Windowss with the entire peak power 46 KW and production 32 MWh. The sum of produced energy is used to necessitate of 70 % of the energy for icebox and deep-freeze. An energy balance equation is frequently used for ciphering energy ingestion which can be implemented here Where Ein is the energy that flows in to the system, Prod is produced energy, Eout is the energy that flow out from the system and Ack is the accrued energy in the system. Local Inhabitants Influences With the increasing population and economic growing of the Hammarby Sjostad, there is an inevitable influence by the occupants of the territory. As the territory has good developed transit system including different foot way and bike lane. Private auto utilizing is non encouraged here. So about 80 % of the occupants and workers are utilizing public conveyance, bike or on pes. Thus they are playing a important function to cut down traffic burden and dodo fuel consume to guarantee the pollution free environment. The eco-friendly auto of auto pool system provides the personal demand of holding auto in pressing period. The dwellers of the metropolis is good known about the waste direction and they do their regard about screening of wastes until today and eventually to gain it ethier automatic vacuity system or manus over the risky waste to GlashusEtt waste aggregation point. Thus they are playing an of import function to cut down the energy loss for screening waste every bit good as to recycle it for bring forthing biogas. The H2O ingestion of the country is 100 to 140 l/person/day whereas otherpart of Stockholm dwellers use 200 l/person/day. The ingestion manner of H2O usage reveals about their consciousness about sustainability. The low flower system of the lavatory, rinsing machines and dish washers, air sociable lights-out is installed for eco-friendly environment comparison to those of Stockholm metropolis or other metropoliss. The imhabitants response with any acitivities or run organized for the eco-friendly environment. For illustration, in 2005 a run organized against the usage of bacteriacide triclosan, a risky substance used in toothpaste. After the run the analysis of triclosen was found with smaller sum comparison to old clip. Sustainable Urban Planning and Design Design for Sustainability At the planning and designing of the metropolis, the first precedence was given to advance sustainability of the environment without hamering the nature. The optimisation of the resources and the coordination of different energy systems with high tech sustainable engineering make its end closer and easier. Eco-design The chief focal point of the industrial ecology is sustainable development and environment by optimizing the use of natural resources. The life rhythm of the merchandises and resources and its proficient systems defines the sustainability of industrial society. The design of the edifice substructure and its building stuffs are environment friendly. Fuel cells and the edifice double-gazed facade heighten the eco-design of the edifice. Green Roofs Most of the edifices roofs are designed as green roofs covering in stonecrop or sedum workss. This particular eco design non merely brings the attractive force but besides has sustainable impacts. The workss on the roof protect drain to cloacas by adsorbing rain H2O. Vacuum system for solid waste and garbage sorting The solid domestic wastes fractions are sorted and collected through an belowground waste aggregation system. The waste is collected in the belowground room through vacuity suction, one fraction at a clip. The containers in the resistance are collected without lorries that cut down vehicle traffic in the country. It besides avoids workers to transport heavy burden. Hazardous wastes are collected in GlasshusEtt edifice. Construction stuffs All the stuffs used for the building was considered for environmental position. For illustration, the seeable stuffs for facade and on the land of the edifice, stuffs used inside the edifice shell, all the equipments and installing procedure are tested as sustainable, healthy, dry and eco-friendly merchandises. Solar panels and Cells In some of the edifices solar panel has installed to heat the H2O system of the full edifice which reduces the energy ingestion from the cardinal beginning. Some edifice is designed with the solar cells in which Sun visible radiation is harnessed and produces electric energy. A individual solar cell system consists of one square metre can supply 100 kWh/yr. This sum is tantamount to 3 square metre of family energy. Storm H2O from street Storm H2O ( rain H2O, snowmelt H2O ) from the street is collected, purified and released into Hammarby Canal. For purification sand filters and unreal filter wetland is used. Storm H2O besides infiltrated in to the land or drain to Sickla Canal, Hammarby Canal or Danvik Canal. Storm H2O Drain Channel is constructed to have rain H2O from environing houses and gardens via drainage system. This channel H2O besides enhances the beautification of the country. The H2O so runs to Basins named equiliser and eventually to the lake. Biogas All the domestic organic waste and sludge are used to bring forth biogas. Biogas is used for the cookery intent in the country and besides as fuel in eco-friendly autos and coachs. A individual family can bring forth such sum of waste stuffs that can supply sufficient sum of biogas for gas cooker. Biogas is the most environment friendly and sustainable signifier of fuel at nowadays. Communication System Hammarby Sjostad has eco friendly communicating system and energy salvaging vehicles. Private autos are non encouraged here. Well communicating system through Tvarbanan ropeway, coachs, ferry, auto pool etc has less environmental impact in the transit system cut downing traffic burden every bit good as devouring without fossil fuel. Heating and Cooling System Domestic wastes are used as energy beginning in the heat and power works which is used to go around territory warming and chilling system in Hammarby Sjostad. Ecoduct It is the most advanced and efficient solution to maintain biodiversity and ecosystem without any perturbation. In this territory two ecoducts are installed covering with flora. This two broad Bridgess connects two different side of the route in such a manner that animate beings can travel without holding job due to broad route and traffic system. Industrial Ecology Approach All the eco-friendly urban planning and design promotes the sustainability towards industrial ecology attack. Since 1917, it has been developing as an industrial country that had led to a higher pollution rate of the country including dirt, H2O and air. The whole environment became unhealthy and menace to the dwellers. After reconstructing the metropolis, until today it is one of the environment friendly sustainable metropoliss of the universe. So the design and planning has a great function to accomplish this end. The land uses converted from old brownfield sites to attractive residential countries with batch of recreational topographic points including green public infinites. The energy used in the metropolis is from the renewable fuels and biogas produced from the domestic waste. All the edifice has efficient energy ingestion. Water supply is maintained with the standard high quality with new engineering and reuse of H2O and sewerage after handling with maximal degree and released into nearby canals. The possible upper limit recycling system is introduced for the domestic wastes with the latest automatic vacuity. Transportation system of the metropolis is besides considered for the sustainable environment and less fuel ingestion rate. It has fast, attractive conveyance system including ferry, auto pools, eco-friendly auto, pes and rhythm way promoting cut down of private auto uses. All the stuffs used for the building of the edifice are healthy and environment friendly. Soil decontamination and ecoducts guarantee biodiversity of local flora and insects. Now this metropolis is regarded as the decontaminated country announced by the Stockholm s Environment and Health Administration. All these installations and sustainable development of the Hammarby Sjostad promotes the industrial ecology attack guaranting the undermentioned standards: Industrial metamorphosis Eco-design Dematerialization and decarbonisation Industrial sysmbiosis Eco-industrial park Eco-efficiency Pollution control Reuse, Recovery and Recycling Waste minimization Cleaner production and clean Technology Life rhythm and environmental impact appraisal Integrated planning, advanced eco-solutions and engineerings. Discussions To construct an environment friendly lodging undertaking it is necessary to concentrate and see many different facets that influences the environment. Hammarby Sjostad undertaking tried to convey concentration to every individual issue. It was non easy to reconstruct a extremely contaminated unplanned metropolis into a developed and wholly uncontaminted and pollution free metropolis. Hammarby Sjostad provides a alone illustration of wastrel direction and biogas production. The modern engineering of vacuity system makes easier to command waste direction and decline transporting vehicle that cut down traffic burden and fuel. The best production comes through the organic wastes bring forthing biogas which is used for cooking intent of the edifices. Combustible wastes are used to bring forth energy at Hogdalan combined heat and powerplant as a beginning of the power coevals and warming system of the territory. Private vehicle auto pool system and broad rhythm lane and foot way plays an o f import function to cut down green house gas. All the families are equipped with low blushing lavatory to cut down H2O ingestion. Hammarby Sjostad present a alone and different system to roll up storm H2O and rain H2O in the street and to handle it before let go ofing it to the lake while it is non considered in any other metropolis allowing storm H2O straight release to lake. However, all the building stuffs used for constructing up this metropolis are healthy, dry and environmentally sound. Energy ingestion process besides enhances the sustainability of the metropolis utilizing renewable energy. From the above treatment on this instance survey of Hammarby Sjostad, it can be easy recommended for constructing any sustainable metropolis to see following major standards: Eco-design for the metropolis sing environmental impacts during its whole life rhythm Eco-efficiency following maximal usage of ferenewable wer resources and making less waste and pollution Introducing industrial metamorphosis Eco-industrial park effort to cut down waste and pollution by sharing resources expeditiously collaborating with concern and local community Ensure industrial mutualism Decisions It is said that developing metropoliss ever destroy the natural environment but in the instance of Hammarby Sjostad wholly go different. Allready the metropolis is proved its achievement towards sustainability without haltering the natural environment every bit good as pollution and taint free country. The metropolis provides the best engineering with incorporate environmental solutions. Though the metropolis has long manner to turn out itself as a existent sustainable metropolis, still it can be regarded as a function theoretical account of existent estate development in industrial ecology attack.

The Language of Education!

The Language of Education! The language of education has always been of a supreme importance. This problem becomes even more important nowadays since the migration processes in the contemporary world is very active and the national and consequently linguistic situation is permanently changing. The US is characterized by high levels of migration and the growth of population is partially provided with new immigrants who arrive in this country often without proper education and knowledge of the local language.Naturally in such circumstances the state has to cope with the problem of linguistic diversity and focus on the bilingual education as a possible way out from the difficulties that are created for national minorities because of language.However, the problem, or to put it more precisely the necessity to introduce bilingual education, is not new for the US and within the 20th century, especially in its second half, the state attempts to solve this problem on both levels, federal and state.English: 14th Amendme nt of the United States Const...As a result, different programs and legislative acts were implemented in order to provide all nations and national minorities with the possibility to receive education in their own language along with the official language of the whole country.Such programs and laws have been started not just because of a political will of some politicians, but the moving force of the introduction of bilingual education were juridical precedents which were the results of quite numerous court cases. These court cases aimed at the solution of the problem of a traditional education based in English only and providing national minorities with equal rights to receive the education as any other citizen of the United States.One of the first, and yet most famous and significant court cases concerning in a way the problem of bilingual education was the Brown v. Board of education (of Topeka)...

Types of business entities and legal characteristics of Essay

Types of business entities and legal characteristics of proprietorships and partnerships - Essay Example For this reason, it becomes logic and less involving in coming up with other options of sharing profits apart from the dividends. One way used to evade double taxation is by putting all family members on a salary. The salary paid to employees is taxed at the corporation level. However, this is only legal if all shareholders have a well defined job description. If there is any form of over payment or illogical rewarding of salaries, the process may be termed to be illegal (Murphy & Higgins, 2011). In another way, the family members can restrict themselves from taking dividends and borrow money instead. If a shareholder borrows money from a company, the amount is not taxable and in all interest generated from the lease are directed in the company. According to Murphy & Higgins (2011) leasing of assets by the family to the company is also a legal way of evading double taxation. In this scenario, the family members will greatly rely on the compensation rates paid to leased assets. In other cases, the leasing of assets also involves easing of human resources. In the leasing process, the profits stay in the company and the family members have the right to acquire the benefits paid from their leased assets (Murphy & Higgins,

King Lear #1 Essay Example | Topics and Well Written Essays - 500 words

King Lear #1 - Essay Example The cad! My heart went out to the beautiful girl. So little, so young, standing there; dishonored only for having been honest, it was just too unfair! I could not stand to see her insulted that way. After all, even the most poor of my people was more gallant than this knave. When Lear asked me my opinion on the matter, going so far as to suggest my refusing her: I spoke my mind. I told him that now that Cordelia was alone, penniless and wronged, I found myself loving her, wanting to protect her even more. I told him that it mattered not to me if Lear disowned her, she was more than enough dower all by herself. These men astound me. Are they no better than cattle, to be bought and sold like this? And what of the King himself? Blinded by flattery? Well, â€Å"No fool like an old fool†, as they say in France. I shall turn in for the night now, but my heart is glad. From now, my nights and days shall be shared with a maiden as fair as she is virtuous. This evening at King Lear’s court I was amazed to find the love of my life Cordelia silently weeping in a corner while the King berated her. As he began to explain his reason for calling me and Burgundy there, I understood that it was because he had decided to disinherit his youngest daughter. The news verily made me reel. Was she not his most precious? Did he not only yesterday speak to me about how dearly he loved the girl? And yet today, only because she refused to flatter him, he was banishing her. Burgundy, that dishonorable excuse of a Duke, turned down her hand. Now that she was without a dower, he said he could not accept her to be his bride. Well, too bad for him! I could not have been gladder. Now that they were insulting the girl and she was left all alone, I felt even more tenderly toward her. And I made my opinion quite clear too! I said to Lear that I should be honored to have his daughter for my bride. It was not important to me whether she had a fat sum of mon ey following her or whether it was

Assignment Example | Topics and Well Written Essays - 750 words - 122

Assignment Example Firstly, I would like to express my satisfaction with the writing of this play. Indeed, by composing it, Euripides was out to demonstrate his literary prowess. In his writing, the author effectively used the element of characterization. He made a good choice of characters that would make it much easier for him to deliver his intended message to the audience. Each of the characters was given a name and role that perfectly suits them. They include Medea, Jason, Children, Glauce, Creon, Aegeus, Messenger, Nurse and the Tutor. Each of these played a very significant role in promoting the continuity of the play and developing its themes. The interaction between the protagonist and other characters was quite impressive. The role played by characters like Medea and Jason helped in demonstrating how the Ancient Greek society was discriminative and bias towards the womenfolk. All these were clearly brought out by the manner in which the author empowered his characters. If it were not for them , the play would not have enjoyed an uninterrupted continuity. Besides, the play has adequately utilized the aspect of theme. In his composition, the author was very much concerned about a particular message he was intending to pass to his target audience. Apart from using appropriate characters to help in doing this, he chose a good setting that suits the play. Essentially, Corinth is one of the historical Greek cities that can be used to understand the Ancient Greek history by shedding more light on how the Greeks interacted amongst themselves and with their gods on the day to day basis. With characters like Medea as a protagonist, the author would not struggle to explore the themes of position of women in the society, love, pride and revenge. The theme of love was produced as a result of the love affair between Medea and Jason and later Jason and

Human Comfort And Thermal Comfort Engineering Essay

Human Comfort And Thermal Comfort Engineering Essay Abstract: The main purpose of the HVAC system is to achieve clean indoor air quality and human comfort (thermal comfort), there are many HVAC systems a designer or owner has the option to select based on the factors such as the type of the building, architecture, location, shape, surrounding climate, occupancy, envelop, level and frequency of activities, and the system operation schedule. In addition to the above base factors that an HVAC system is expected to be selected upon, the energy consumption, system efficiency, initial and operational cost, and finally, feasibility (short and long term rebound positive effect) are of the owners and designers critical concerns. This paper will discuss the elements of a typical feasible high performance low cost, fine tuned HVAC DDC integrated system to achieve the best for users, owners, and environment. 1. Introduction HVAC and its associated auxiliaries system are major energy consumers in a building, the rapid development of the advanced technology nowadays boosts the HVAC system feasibility as more complex control systems are developed for this industry and additional fine-tune, prompt response, standardized communication, ease of control and monitor, and remote accessibility. The BMS/DDC (Building Management System/ Direct Digital Control) integrated system is the core of a good feasible high-efficient HVAC system. The BMS is the most recent High-Tech energy management system that manage a building performance to the maximum desirable pre-determined set of parameters which able to control, monitor, adjust, save and record mostly all of the building facilities and utilities when integrated with all of the compatible buildings Sub-LANs, a DDC is one of those LANs and can communicate with other control LANs under the supervision of the BMS. BMS is able to supervise, control, adjust and record the illumination, electric power control, HVAC, security and observation, magnetic card and access, fire alarm, lifts, and other engineering systems. Integrated with the BMS, the DDC performs the HVAC control management and communicates with the other building controllers via the BMS to achieve integration based on a specified, programmed event sequence. I The DDC is the heart of an efficient HVAC system, it finely tunes the digital/analog input/output communication between sensors, probes, stand-alone controllers, LANs controllers, and finally the controlled element which could be an actuator that adjust the process variable (flow, temperature, level, or pressure), and allows for a feedback signal to further adjust the desired process set-point. This whole process is reported in a real-time manner to the BMS system for further coordination with the other buildings controllable systems to achieve integration based on the pre-programmed parameters. In order to achieve the highest human comfort, energy saving, and a long term rebound effect strategy, The BMS/DDC system should be interlocked and integrated with a high-efficient and feasible HVAC system, this combination can awards energy saving, system and environment sustainability, human comfort, and business feasibility. An Optimal Air System is a good example of a low-coast, high-performance, energy-efficient and a good investment for long-term rebound pay-back effect. Optimal Air System concept is based on the low temperature supply system that needs, less energy consumption by the most energy consumer auxiliary that is the fan, this affects the sizing of the ducts (less duck size), air handling units and fan motors, all of which will be smaller and results in a system that requires less space and uses less power. As this paper focuses on the HVAC/DDC integrated system application for human comfort, energy saving, and feasibility (long-term rebound effect), I will discuss and focus on the DDC and Optimal Air System integration for the above purposes and define characteristics, elements, and functions of both systems. II 2. DDC DDC has became the latest and the most recently used system for HVAC controls after the pneumatic and electromechanical control systems, digital pre-programmable controllers can handle extensive digital/analog data process from inputs (sensors, tranceducers and transmitters) that tyapically mesure temperature, flow, humidity, pressure or level, and outputs to final controlled devices to adjust a process variable based on a preset parameters, also recives a feedback signals from inputs again to further adjust signal command errors for best results based again on the setpoints. Digital inputs are Dry contacts from a control device, analog inputs are voltage and current signals that mesure variables such as humidity, pressure, level or flow form sensing devices and converted to percentage. Digital outputs are of 1 or 0 binary that either stops or starts equipments via a relay, analog outputs are voltage or current signals that control a process variable control devices such as valves, m otors or dampers. The DDC program code may be customized for intended use such as: Time schedule, sequence of operation, trend logs, alarms. 2.1 Elements of a DDC As described above, the three functional elements needed to perform the functions of a DDC system are: a) A measurement element (Sensor, prob, Transmitter, Transducer) b) An error detection element (Digital/Analog/pneumatic Controller, PCU) c) A final control element (Motor/Piston Actuator, VFD, VSD, Relay) 2.2 DDC controled mediums The DDC controls two variables: I. A controlled variable is the process variable that is maintained at a specified value or within a specified range. II. A manipulated variable is the process that is acted on by the control system to maintain the controlled variable at the specified value or within the specified range. 1 2.3 Functions of DDC system In any DDC, the four basic functions that occur are: a) Measurement b) Comparison c) Computation d) Correction 3. DDC LAN-WAN Configuration DDC is where mechanical and electrical systems and equipment are joined with microprocessors that communicate with each other and to a central computer BMS. This computer and controllers in the building Management system can be networked to the internet or serve as a stand alone system for the local peer-to-peer controller network only Fig 1. Additionally, the controllers themselves do not need a computer to operate efficiently as many of these controllers are designed to operate as stand-alone controllers and control the specific equipment they are assigned to control. Fig 1. Typical peer-to-peer controller network [1] 2 With a few exceptions, each DDC or building automation controller holds their own programs and has the ability to communicate to other DDC building automation controllers. It is important for the DDC or building automation controllers to communicate to each other. If the network fails for whatever reason then the system may still function (because the DDC controllers in a BMS system are stand-alone) but it will not function as efficiently as designed. The DDC/BMS system can be configured as independent (localized) closed-system, or DDC open-system based on accessibility options required by a group of buildings managed by a single company or property management firm (centralized), or a single property to be monitored and controlled by its own (localized) Fig 2. Fig 2. DDC/BMS LAN/WAN configuration [2] 3 3.1 BACnet compatibility BACnet is the term commonly used to refer to the ANSI/ASHRAE Standard 135- 1995, adopted and supported by the American National Standards Institute (ANSI) and the American Society of Heating Refrigeration and Air-Conditioning Engineers (ASHRAE). BACnet stands for Building Automation and Control network. BACnet is a true, non-proprietary open protocol communication standard conceived by a consortium of building management, system users and manufacturers [3]. A closed protocol is a proprietary protocol used by a specific equipment manufacturer. An open protocol system uses a protocol available to anyone, but not published by a standards organization. A standard protocol system uses a protocol available to anyone. It is created by a standards organization. Open Systems: An open system is defined as a system that allows components from different manufacturers to co-exist on the same network. These components would not need a gateway to communicate with one another and would not require a manufacturer specific workstation to visualize data. This would allow more than one vendors product to meet a specific application requirement. The DDC/BMS BACnet based LANs and Sub-LANs can be accessed, controlled and monitored from remote locations via the Internet trough a centralized data management system which is capable of collecting data from multiple sites. This is accomplished by connecting with a gateway for collecting data from the lighting and air-conditioning control systems installed in each building or factory, and the center server for providing data collection, database and web server functions along with security measures applied to all transmitted data. Based on the capability of real-time monitoring and analysis of actual energy consumption such as electricity and gas from a remote location by using a web browser, this system is able to achieve the maximum level of energy saving in buildings and factories which in turn, reduce the emissions and the environmental impacts by taking advantage of its cost effectiveness and by limiting the required energy for a specific application or function. 4 Fig 3, Integrated BACnet based WEB Browser BMS Control System Layout [4] 5 4. DDC/BMS integrated features, application and functions 4.1 Energy saving DDC/BMS allows the owner to set up schedules of operation for the equipment and lighting systems so that energy savings can be realized when the building or spaces in the building are unoccupied. Have algorithms as reset schedules for heating plants, static pressure control, and other systems where energy savings can be realized through these predictive programs. 4.2 Human comfort (thermal Comfort) DDC/BMS system allows the equipment optimal start with pre-scheduled program. Optimal start is allowing the equipment to be brought on in an ordered and sequential manner automatically on a schedule before the building is reoccupied so that space set points can be realized before occupation. Event sequence programming features allow the system to compare space temperature, outside air conditions, and equipment capabilities so that the equipment can be turned on at an appropriate time to ensure space set points are achieved before occupation. Have trim and respond capabilities. Based on zone demand the set point for various heating and cooling sources will change according to demand from the zones. For instance, in a Variable Air Volume system, all the VAV boxes are served from a central air handling unit. If all the zones are at set point then the supply air temperature set point of the air handler is automatically changed to prevent mechanical cooling from occurring when it is unnecessary. When the zones grow warmer the supply air temperature set point is automatically lowered to allow mechanical cooling to satisfy demand. In conjunction with the appropriate mechanical system set-up, offer economizing based on enthalpy calculations and/or CO2 set point control. 4.3 Long-term rebound effects Offer load shedding when power companies are at peak demand and need business and industry to cut-back on power usage to prevent black outs. Building Management systems for instance, allow the owner to cycle various things off like water heaters or drinking fountains where use of these things- 6 -will not be noticed even though they are off. Management companies who acquire a good DDC/BMS can set up the system to bill tenants for energy usage (fewer employees required). 4.4 Proactive Ability to send alarms via email, pager, or telephone to alert building managers and/or technicians of the developing problems, and system failures. 4.5 Other applications and compatibilities Have the ability to monitor energy usage including the ability to meter electric, gas, water, steam, hot water, chilled water, and fuel oil services. Have the communications abilities to be integrated with other buildings via WAN setup using the standardized TCP/IP family of protocols. It is BACnet base web browser compatible and other open source communication protocol which allows the system to be accessed via the web browser from remote locations. (Refer to 4.2) 5. High-performance Low-energy HVAC design Recall the Introduction, In addition to BMS/DDC System application for energy saving and high HVAC system performance, a green HVAC system design will achieve all aspects of comfort, energy saving, low initial and operational capital costs, and adds more efficient performance in conjunction with the DDC system, an example of such green HVAC system would be an Optimal Air System [5]. Optimal Air System concept, idea and example are taken from McQuay Air Conditionning/2002 McQuay International/Application Guide AG 31-005 as an example to illustrate its benefits for energy saving, human comfort, lower initial cost and long term rebound effects. Optimal Air systems uses less energy than conventional systems on an annual basis, for example, In a conventional system, supply air temperatures run between 54Â °F -57Â °F from the air handling unit. With duct heat gain, the supply air ranges from approximately 56Â °F-59Â °F out of the air diffuser. 7 In Optimal Air System, supply air temperature run between 45-52Â °F from the air handling unit to optimize energy consumption, reduce first capital cost and improve humidity control. Optimal Air has for years been extensively used in grocery stores and is gaining increasing popularity in comfort cooling applications such as offices and schools. 5.1 Advantages There are several benefits of Optimal Air that make it an attractive system for use in a wide variety of applications. It Saves Space and Reduces Energy and Construction Costs, increases the amount of sensible heat that each CFM delivered to a zone can absorb. While 50Â °F air may not seem much colder than 55Â °F air, the delta T rises from 20Â °F to 25Â °F. That is an increase of 25%. This affects the sizing of the ducts, air handling units and fan motors, all of which will be smaller and results in a system that requires less space and uses less power. In many applications, fans can use more power annually than refrigeration (chillers, condensing units, pumps, and compressors). An example of annual 10-story building energy usage of 200,000 square-feet of HVAC components, the fan energy use is high because the fans operate every hour the building is occupied providing minimum air movement, ventilation air, heating, etc. In this case, an Optimal Air system would have a very real impact on overall energy costs. Fig 4, Annual HVAC Energy Usage [6] 8 5.2 Less Humidity, more comfort Optimal Air systems take more moisture out of the return and ventilation air mixture as it passes over the cooling coil. The lower moisture content in the supply air reduces the Psychrometric balance point humidity level in the conditioned space. This allows the space temperature to be set higher while achieving the same comfort level for occupants and further reduces the supply air quantity and fan power requirement. 5.3 Quieter and Improve Indoor Air Quality (IAQ) The lower air volume required for Optimal Air systems makes them quieter than conventional systems. Fan sound generation is a function of fan type, static pressure and air volume. By reducing air volume (and often the total fan static pressure) Optimal Air systems generate lower fan sound which can result in more desirable space conditions. This reduced sound generation can also be used to reduce the cost of any required noise attenuation in critical applications. The lower required air volume can also be used to reduce filter face velocities, allowing more efficient filters to be used without high energy cost penalties. The lower air temperature and resultant humidity levels also reduce the chance of mold growth in the air handling units, ducts or the occupied space. The example of the building above requires a supply air of 26,667 CFM. The HVAC system is floor by floor VAV air handling units with a two chiller primary secondary system, Optimal air works equally well with applied rooftop units or indoor vertical self-contained units. Table 1, HVAC system performance with optimal air system [7] 9 Table 1 shows the HVAC system performance as the supply air temperature, to the duct, is lowered. It is important to differentiate between supply air temperature off the cooling coil and supply air temperature into the duct. To accommodate the lower supply air temperature, the chilled water supply temperature (CWST) was gradually lowered, the air handling unit coils deepened to allow for closer approaches, and chiller performance was adjusted to deal will the increased lift. Because of their basic operating differences, DX rooftop and self-contained systems may have a different Optimal Air temperature than a chilled water system. When considering multiple system options, it is important to use Energy Analyzer for each in order to identify the best option. 5.4 Optimal Air Balance Point Reduced fan energy must be traded off against increased refrigeration energy. This trade off varies with the type of building, the type temperature control system, the type air conditioning system and geographic locale. Therefore, the optimal supply air temperature is different for every job. When only energy costs are a factor and no thermal storage is involved, this optimal supply air temperature generally falls in the 47Â °F -52Â °F range. It can be determined by comparing total system energy consumption with varying supply air temperatures using an energy analysis program. 5.5 Space Design Temperature and Related Comfort Temperature, humidity, air velocity and mean radiant temperature directly influence occupant comfort. Conventional designs are usually based on maintaining 75Â °F and 50% RH (Relative Humidity) in the occupied space. Figure 5 shows the ASHRAE comfort zone where 80% of the people engaged in light office work are satisfied. As the relative humidity is lowered, the space air temperature can be raised and still provide occupant comfort. The leaving air condition from the air handling unit is the primarily control of the relative humidity in the occupied space. The internal moisture gains from people, kitchens, etc, as well as infiltration also play a part. 10 Fig 5, Equivalent comfort chart [8] In most climates, the lower the supply air temperature, the lower the humidity ratio and the drier the space. Figure 5 shows sensible heat ratio lines for conventional, Optimal and low supply air temperatures. As the space relative humidity is lowered, the space temperature set-point rises from 74Â °F to 78Â °F. 5.6 ASHRAE Compliance The 1999 and 2001 version of ASHRAE Standard 90.1, Energy Standard for Buildings except Low Rise Residential Buildings [9], has mandatory requirements for refrigeration equipment and prescriptive requirements for fan work. The Standard recognizes that Optimal Air systems improve fan work significantly and provides credits to account for improved fan performance. In addition, refrigeration system performance is rated at conventional conditions or special tables are provided to account for non-standard operating conditions (as is the case with centrifugal chillers). In either case, ASHRAE Standard 90.1 does not penalize Optimal Air systems. 11 5.7 Design Considerations Design of refrigeration and air handling equipment for an Optimal Air system is similar to the design of a conventional air temperature system. Attention must be paid, however, to air distribution, controls and duct design. Conventional diffusers, when properly applied, will work with Optimal Air. Controls also require only minor changes from conventional systems. In particular, programming of economizer controls and supply air temperature reset. Finally, the ducting system must be sized for the reduced air volume to take full advantage of the potential capital savings. Duct insulation and sweating should also be reviewed to provide a trouble free system. Not every building type is a good candidate for Optimal Air. When air volumes are dictated by air turnover rates, such as some health care applications, Optimal Air offers no advantage. In fact, there would be increased reheat costs. Office buildings are a strong candidate for Optimal Air. They have high sensible heat ratios and typically less than 20% ventilation loads. Schools can also be a possibility. Generally speaking, as the percentage ventilation load increases, Optimal Air becomes less attractive. Location and climate also impact whether or not Optimal Air is a good candidate. Locations where weather provides significant economizer hours between 45 and 55Â °F will limit the savings. Ultimately, each project must be checked by performing the applicable specific calculations. The following should be considered: Load and Balance Point calculations, Space Temperature Set-point evaluation, Design Load Calculation, Primary and Secondary System Selection, Parallel, mixing or series VAV-Fan powered boxes, Perimeter Heating, Air Distribution, Diffusers (based on air flow and the throw distance calculation), Duct design (considering duct heat gain, sweating and insulation). 5.8 System Life-Cycle Analysis Evaluating different engineering solutions is always part of a good proposal. Optimal Air systems are no different. 12 In the case of Optimal Air, there may be no need to do any calculations because Optimal Air systems cost less to build (lower capital cost) and have the same operating cost as conventional systems (assuming the balance point was used for the design). Duct sizing will decrease almost linearly with reduction in air volume. The installed cost will not change linearly because of the labor portion. A 20% reduction in air volume can result in 80% savings of the 20% reduction or 16% overall savings in sheet metal cost. On the plus side, there are less pounds of steel and fewer man-hours to install it. On the minus side there is more insulation. Terminal boxes and diffusers will be a wash since there are fewer of them but the equipment cost will be higher than conventional equipment. HVAC equipment will cost about the same. This is conservative because the air handling equipment will cost less and refrigeration equipment will be slightly more. There is typically more capital invested in air handling than refrigeration. Building envelope should be the same for new construction. In the case of retrofit applications, it will depend on the quality of the existing building. The cost of space may also need to be evaluated. Not accounting for space savings is conservative. There will be space savings but they may be difficult to realize. If enough plenum height savings can be realized to add another floor within the same building envelope, then that rentable space should be accounted for. Simple payback calculations do not take into account the cost of money, taxes and depreciation, inflation, maintenance or increases in the cost of energy. A more complete analysis should include Internal Rate of Return (IRR) and net present value (NPV). In the HVAC industry, many projects fail simple back (they are in the 5-year range) while passing IRR (they offer a 25% rate of return). Software analysis tools can be used to perform both energy and life-cycle analysis that include simple payback, IRR and NPV. 13 6. Conclusion Building owners and designers faced with increased concerns for energy saving and environmental stewardship search for cost effective system options for their projects. The DDC, integrated with a high-performance low-energy HVAC system as the Optimal Air system can deliver both low first costs and reduced energy costs in a new construction and retrofit applications. This integrated system will not only meet the efficiency and sustainability of its performance at the desired set-parameters, but when designed with advanced selection tools, installed with the most advanced DDC/BMS system, and supported by trained operators, will achieve both energy saving and long term rebound effect (pay-back), maximum human thermal comfort, in addition, it allows building owners to compare predicted energy use to actual performance, this leads to a flexible budgeting, further future system adjustment and energy consumption cut-back. The whole integrated DDC/BMS HVAC system function will also contribute in the environmental impacts reduction. In todays challenging energy efficiency, building owners need proven system that delivers the necessary performance to meet their integrated environmental sustainability and business goals [10].

Advancements in Medical Technology Essay -- Ecploratory Essays

Advancements in Medical Technology Advancements in technology, especially advancements in computers, have caused a major impact on today’s society.â€Å"More specifically, profound effect on modern day medicine.†[instruct.lanagara.ba.ca 1.] [1] It has changed almost every aspect of the medical field, from the instruments used to the medicines prescribed to the operations preformed.â€Å"New technologies allow healthcare professionals to save people they never could have saved before.†[collegeview.com 1.] [2] â€Å"The 20th-century has brought with it many advancements in medicine.† [utep.edu 1.] [3]Below is a list of the then most important advancements, none of which would have been possible without improvements in technology. The Ten Most Important Discoveries of the Century 1 Antibiotics (Penicillin) 2 Anesthesia 3 Polio Vaccine 4 Birth Control Pill 5 Open Heart Surgery 6 Organ Transplant 7 Medical Imagery (x-rays, MRI, CAT scans) 8 Anti-inflammatory (Aspirin) 9 Ambulance Services 10 Genetic Based Research [4] Almost every instrument in the medical field has become computerized.Everything from thermometers to CAT scans is either a type of computer itself or is monitored by a computer.They calculate and factor all the data leaving rarely any information to be determined.Thus, allowing for more efficient results because it reduces the risk of human error.Plus, since other healthcare professionals are busy caring for the patients new jobs are created to operate the computerized instruments.â€Å"Carefully designed instruments have given researchers the opportunity to better understand biological processes.† [instruct.langara.ba.ca 1.] [5]Microscopes, for example, have allowed organism and cells to be studied a... ...d be significantly increased. Advancements in technology have positively affected the medical field more than any other professional field.Without technology researchers would not be able to discover new medicine and new way of preventing disease.Doctors would not be able to receive such accurate testing results and they would not be able to perform nearly as many surgeries as they can with improved technology.Who knows what even more technological advancements will mean for all of medicine and for all of society. Bibliography Advancements in Medicine.[On-line]. Available:http://www2.utep.edu Medicine and Health.[On-line]. Available: http://www.collegeview.com Technological Advancements in Medicine.[On-line]. Available: http://www.instruct.langara.bc.ca Wilmore, Jack H. and David L. Costill. â€Å"Physiology of Sports and Exercise.† 2nd ed. 1999.