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Fang LIU, Ph.D., P.E., Shanghai University of Electric Power
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Weiquan Zhu, Shanghai University of Electric Power
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Yang Cai, Shanghai University of Electric Power
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The experimental performances of a dual-mode CO2 heat pump system coupled with hot and cold thermal storage is investigated in this paper. This combined system was tested by controlling compressor frequency, expansion valve opening and hot and cold circulation water flow rates. Experimental results show that high compressor frequency benefits the combined system performances. Expansion valve opening affects the thermal stratification of thermal storage tanks very slightly. Low hot and cold water flow rates are good for the thermal stratification of thermal storage tanks although high water flow rates can enhance the COP of heat pump system; and thermal stratification in thermal storage tanks is one of the most important impact factors on the COP of heat pump.
