With the concept of building a green low-carbon campus proposed,solar collector air-source heat pump technology has been widely used in universities.In order to better analyze and evaluate the energy conservation and carbon reduction effects of the solar collector air-source heat pump hot water system,a parallel solar collector air-source heat pump(SC-ASHP)hot water system for a university dormitory building is developed,the annual actual operation of this system is analyzed,and a comparative study with the operation of a single air-source heat pump(ASHP)hot water system is conducted.The results show that,the typical peak water consumption period of the dormitory building is from 18:00 to 22:00,which is favorable for the parallel solar collector air source heat-pump hot water system to use solar energy to heat the water tank in the daytime,and the remaining insufficient part is compensated by the heat pump.The power consumption per ton of water can be used as a key parameter to evaluate the operation effect of the hot water system.The power consumption per ton of water in the parallel solar collector air-source heat pump hot water system decreases gradually with the increase of ambient temperature Ta,and decreases first and then increases with the increase of inlet water temperature Tin.When Ta and Tin are both 11.5 ℃,the power consumption per ton of water in the system reaches the minimum.This is because when Tin＞11.5 ℃,it is not conducive to heat release of the heat pump condenser,the heat pump efficiency decreases,and the power consumption per ton of water in the hot water system increases accordingly.The power consumption per ton of water in the parallel solar collector air-source heat pump hot water system is generally lower than that in the single air-source heat pump hot water system,and the heat pump has the largest impact on the power consumption per ton of water in the system.Compared with the single air-source heat pump hot water system,the parallel solar collector air-source heat pump hot water system saves 41,800 kW·h of electricity annually on average,and reduces the indirect CO2 emissions by 41.67 tCO2 annually on average,which has obvious energy conservation and carbon reduction effects.
power consumption per ton of watersolar collector air-source heat pump technologyhot water systeminlet water temperatureenergy conservation effect
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