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In the combined cooling, heating and power system, electricity is produced by prime mover. Recovered heat from the prime mover supplies heating and cooling demands. In this research, primary energy saving and carbon dioxide emission reduction are employed to evaluate the performances of cchp system compared with conventional system for residential buildings in Tehran. The combined cooling, heatig and power system follows Maximum electrical or thermal demand and Maximum rectangle electrical or thermal demand management. The results indicate that cchp system for residential five, eleven-storey buildings, in maximum rectangle electrical demand, maximum rectangle thermal and maximum electrical demand modes is the best strategy, if cooling demand is produced by absorption chiller and electric chiller. In the best strategy, primary energy saving and carbon dioxide emission reduction are 13% and 12%, respectively. If cooling demand is produced only by absorption chiller, primary energy saving and carbon dioxide emission reduction are decreased. In this case, maximum electrical and thermal demands are the worst strategies. In the worst case, energy consumption and carbon dioxide emission in cchp are increased 39% and 56% compared to the conventional system, respectively. Payback period in these strategies are calculated 5.5 and 7 years for 11 and 5 tories.

Keywords: combined cooling, heating and power- energy saving- carbon dioxide emission reduction- absorption chiller

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