Research on the influence of air temperature on the performance of lake water heat pump
The temperature has great influence on the performance of lake water source heat pump.The lake heat balance model is established,and the relationship between lake temperature and air temperature is obtained.Then,the building cooling load and the per-formance parameters of lake water source heat pump are calculated.Taking a project in Nanjing as an example,the simulation results show that the lake temperature in summer is 3～8℃ lower than the air temperature and the intake temperature of the lake water source heat pump is below 32℃ due to the influence of temperature.The increase of the temperature in summer causes the rise of the lake water temperature,both the building cooling load and the energy consumption of LWHP go up similarly,which leads to the de-crease of the coefficient of performance(COP)of LWHP,and the COP in summer is kept between 3.8 to 6.6.In winter,the lake temperature is 3 to 8℃ higher than the air temper-ature,and the intake temperature of LWHP is basically kept above 5℃,which can ensure the normal operation of LWHP.The COP rising rate increases from small to large with the increase of the air temperature,and it stays between 3.5 to 5.8.
temperaturelake water heat pumpcooling loadcoefficient of performance
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