Since the urbanlization in China is accelerating, the effect of heat-release of building cooling system on urban climate is bigger and bigger. Aimed at this situation, taking the case of 6-7 August 2010, (typical sunny day case in the Beijing area in summer), to carry out the research about the building energy model and the anthropogenic heat release of cooling system. It's found that the electrical energy consumption of different uses of the buildings has different diurnal variations, and it's also mostly related to meteorological factors. Based on these foundations, the simulation to energy consumption and heat-rejection of cooling system (air-condition) is performed with the modified Build Energy Model(BEM). Firstly, according to the features of the diurnal variations of electrical energy consumption, simulate the heat rejection of disparate uses of buildings. Analysis shows that among the thermal load, the percent of heat conducted by walls and windows is more than 60%, the rate of heat produced by humans and equipment is about 30% and received through the ventilation is 5%~6%. Secondly, a sensitivity analysis of a few parameters vastly affecting the result is carried out. The most important factor of building parameters is building height, when it varies from 18.3 m to 12 m and 6 m, the building heat-release will decrease 24.3% and 49.6% respectively. The second important parameters following building height are wall-conduction and ventilation coefficient.The heat-release can rapidly raise 94.4% while the target temperature falling from 25℃ to 24℃. Finally, the result of distribution of sensible heat and latent heat is calculated with the rate of the diverse air-condition in China, the value is 12.69 W·m-2 and 45.87 W·m-2 (about 22% of the peak value is sensible heat and the remaining part is latent heat in a single day). These results will laid the foundation for building thermal effect on urban climate research.
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