Collaborative control of frequency and opening of electronic expansion valve in variable flow water source heat pump system
In order to improve the operational performance of variable flow water source heat pump system,constant compressor frequency variable expansion valve opening and constant valve opening variable frequency experiments were carried out,and a joint frequency-valve opening regulation strategy was proposed and cooperative control experiments were conducted.The effect of this strategy on the performance of water source heat pump systems was investigated.The results show that the regulation range of the electronic expansion valve decreases at lower frequencies,and can be expanded by increasing the chilled water temperature appropriately,the valve opening corresponding to the maximum heat production and the optimum CoP are the same.When the frequency is 45-55 Hz,the regulation interval is small,and changing the chilled water inlet temperature has little effect on the regulation characteristics of the frequency,heat production increases with the rise of frequency,COP decreases with the rise of frequency,according to the user's different needs to choose a better frequency value,this strategy increases the maximum COP of the system at both operating conditions by 10％and 9.9％over the use of valve opening adjustment only,and by 6.5％and 7.6％over the use of frequency adjustment.
water source heat pumpcompressorelectronic expansion valvecollaborative controlCOP
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