【正文】 e performance of the CHP system and determines of each of these parameters [1]. Five major areas where CHP systems can be optimized in order to maximize profits have been identified as optimization of heat to power ratio, equipment selection, economic dispatch, intelligent performance monitoring and maintenance optimization [6].Many mercial buildings such as universities and hospitals have installed CHP systems for meeting their growing energy needs. Before the University of Dundee installed a 3 MW CHP system, first the objectives for setting up a cogeneration system in the university were laid and then accordingly the equipment was selected. Considerations for patibility of the new CHP setup with the existing district heating plant were taken care by some alterations in pipe work so that neither system could impose any operational constraints on the other [5]. Louisiana State University installed a CHP system by contracting it to Sempra Energy Services to meet the increase in chilled water and steam demands. The new cogeneration system was linked with the existing central power plant to supplement chilled water and steam supply. This project saves the university $ million each year in energy costs alone and 2,200 emissions are equivalent to 530 annual vehicular emissions. 大 連海洋大學(xué) 2021 屆畢業(yè)設(shè)計(jì) 外文翻譯（英文） Another example of a mercial CHP setup is the Mississippi Baptist Medical Center. First the energy requirement of the hospital was assessed and the potential savings that a CHP system would generate [10]. CHP applications are not limited to the industrial and mercial sector alone. CHP systems on a microscale have been studied for use in residential applications. The cost of UK residential energy demand is calculated and a study is performed that pares the operating cost for the following three micro CHP technologies: Sterling engine, gas engine, and solid oxide fuel cell (SOFC) for use in homes [9]. The search for different types of fuel cells in residential homes finds that a dominant cost effective design of fuel cell use in micro – CHP exists that is quickly emerging [3]. However fuel cells face petition from alternate energy products that are already in the market. Use of alternate energy such as biomass bined with natural gas has been tested for CHP applications where biomass is used as an external bustor by providing heat to partially reform the natural gas feed [16]. A similar study was preformed where solid municipal waste is integrated with natural gas fired bustion cycle for use in a wastetoenergy system which is coupled with a heat recovery steam generator that drives a steam turbine [4]. SYSTEM DESIGN CONSIDERATIONS Integration of a CHP system is generally at two levels: the system level and the ponent level. Certain tradeoffs between the ponent level metrics and system level metrics are required to achieve optimal integrated cooling, heating and power performance [18]. All CHP systems prise mainly of three ponents, a power generating equipment or a turbine, a heat recovery unit and a cooling device such as an absorption chiller. There are various parameters that need to be considered at the design stage of a CHP project. For instance, the chiller efficiency together with the plant size and the electric consumption of cooling towers and condenser water pumps are analyzed to achieve the overall system design [20]. Absorption chillers work great with micro turbines. A good example is the Rolex Reality building in New York, where a 150 kW unit is hooked up with an absorption chiller that provides chilled water. An advantage of absorption chillers is that they don’t require any permits or emission treatment [2] Exhaust gas at 800176。F es out of the turbine at a flow rate of 48,880 lbs/h [7]. One important constraint during the design of the CHP system was to control the final temperature of this exhaust gas. This meant utilizing as much heat as required from the exhaust gas and subsequently bringing down the exit temperature. After running different iterations on temperature calculations, it was decided to divert 35% of the exhaust air to the heat exchanger while the remaining 65% is directed to go up the stack. This is achieved by using a diverter damper. In addition, diverting 35% of the gas relieves the problem of back pressure buildup at the end of the turbine. A diverter valve can also used at the inlet side of the heat exchanger which would direct the exhaust gas either to the heat exchanger or out of the bypass stack. This takes care of variable loads requirement. Inside the heat exchanger, exhaust gas enter the shell side 大 連海洋大學(xué) 2021 屆畢業(yè)設(shè)計(jì) 外文翻譯（英文） and heats up water running in the tubes which then goes to the absorption chiller. These chillers run on either steam or hot water. The absorption chiller donated to the University runs on hot water and supplies chilled water. A continuous water circuit is made to run through the chiller to take away heat from the heat input source and also from the chilled water. The chilled water from the absorption chiller is then transferred to the existing University chilling system unit or for another use. Thermally Activated Devices Thermally activated technologies (TATs) are devices that transform heat energy for useful purposed such as heating, cooling