This paper discusses the evaluation of a proposed combined heat and power (CHP) system for Jin Mao Tower (JM Tower), a commercial building in the centre of Shanghai. Because of the essential similarity in climate condition and latitude between Shanghai and Tokyo, electricity and heating consumption estimates are based on available Tokyo data. However this study does point out degree-days in order to guarantee the accuracy of energy consumption intensities of Shanghai. Two types of energy supply

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... systems are considered: conventional and CHP. Environmental impact and economic efficiency are evaluated regarding the efficiency of both systems. Relative to the conventional system, CHP is capable of reducing the primary energy consumption by 23% and CO 2 emission by 36%. The total annual running cost savings -the sum of energy, maintenance, and labour costs -are 11.8 million RMB, with a payback period of 3.8 years.