According to the third conference of parties (COP3), Japan has set a target of reducing greenhouse gas emissions by 6% by the year 2010. Cogeneration system is a recently potent method which its environmental benefits, through the highly efficient utilization of fuel that is related to reduction emissions. The particular purpose of this paper is to support the selection of cogeneration technologies by acquiring the optimal useful thermal energy and electrical power from system with

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... cy balance method and fuel saving approaching method. When a micro gas turbine (MGT) is operated under ambient condition, the discharged hot gases from the MGT may be expanded at its exhaust stage and cooled by an exhaust heat exchanger which composes with a single stage absorption heat exchanger. The performance and annual total fuel saving amount of cogeneration plant will be investigated and compared with separated production of heat and power system. Eventually, this cogeneration plant will be reduced the fuel consumption rate in operation that will be also reduced the emissions and fuel cost when the system will gain highly efficiency of thermal energy and electrical power. 200 analysis and support to realize that system is operated with sufficient efficiency or not. Acquisition from analysis performance simulation of the CGS could be expressed in the following and it can be supported to develop the cumulative the CGS plants. Nomenclature COP : coefficient of performance c p : specific heat at constant pressure, kJ/kg K C R : capacity ratio of the EHE FESI : fuel energy saving index h : enthalpy, kJ/kg I m,C : Irreversibility of air compressor, kW I m,T : Irreversibility of turbine, kW LHV : lower heating value, MJ/m 3 m 1 : exhaust mass flow rate, kg/s m c : cold fluid mass flow rate, kg/s m coa : correction mass flow rate, kg/s m f : fuel mass flow rate, kg/s m h : hot fluid mass flow rate, kg/s m w : water mass flow rate, kg/s N c : compressor work-done, kW n cor : correction speed of the MGT, rpm n r : rated speed of the MGT, rpm N t : turbine work-done, kW NTU : number of transfer unit P e : electrical power, kW Q c : sum of heat quantity from condenser and absorber, kW Q e : cooling capacity, kW Q g : heat medium capacity, kW Q h : heating capacity, kW Q th,ehr : exhaust heat recovery, kW Q th,exe : exhaust thermal heat, kW Q th,f : fuel thermal heat, kW Q th,loss : exhaust heat loss, kW r : exhaust heat to power ratio SQ e : standard cooling capacity, kW SQ h : standard heating capacity, kW t 3 : exhaust temperature, ˚C t 5 : outlet temperature of the EHE, ˚C t 8e : inlet temperature for cooling cycle, ˚C t 8h : inlet temperature for heating cycle, ˚C Greek symbols