8月25日上午8：30-12：00，主题为"Simulation of Heat Pump System（热泵系统模拟）"在北京国际会议中心308会议室召开。
The estimation of seasonal performance factor (SPF) of heat pumps is still not an easy task. Several simple methods have been developed in the past but they usually give non accurate values. These discrepancies can be due to the method itself because the COP of the heat pump is not a linear function of the source and sink temperatures, or because the calculation is based on manufacturer performance charts of the heat pump, which, according to our experience, are never the real performance as determined by on site measurements. We present a simple method based on month-average performance of the heat pump. Firstly, we show that month-average quantities give the same results as the experimental ones (error less than 0.7%). We then define a month-average thermodynamic cycle which represents all the experimental cycles of the month. Secondly, we develop a model to predict the characteristics of the month-average cycle. These can be correlated to experimental values measured on the system. The total running time of the heat pump for each month can be obtained when the heat loss curve of the dwelling is available. The model predicts an SPF value close to the experimental one (error less than 1%).