Measurement and simulation of air-soil regenerative heat pump system
In order to solve the problem of soil heat imbalance caused by the operation of the single-heating soil source heat pump system in cold areas,an air heat exchange unit is added on the basis of the soil source heat pump system in a community in Handan to form an air-soil regenerative heat pump system.In the heat storage season,the measured data is used to analyze the water temperature at the inlet and outlet of the buried pipe and heat storage under typical working conditions.The results show that when the outdoor temperature is high,the inlet water temperature and heat storage of the buried pipe are relatively high,which is conducive to the heat storage of the buried pipe.The Trnsys soft-ware is used to establish a system simulation model to analyze the influence of various fac-tors on the soil temperature rise.The simulation results show that appropriately increasing the heat exchange area of the air heat exchanger and the air flow rate can in-crease the soil temperature rise value,but the temperature rise trend gradually flattens out.When the heat transfer coefficient of the air heat exchanger is 40.0 W/(m2·K)and the target soil temperature rise is 3.0℃,two solutions are obtained according to the fit-ting curve of the soil temperature rise:the solution one is with air flow rate of 150×103 m3/h and the air heat exchange area of 9 494.4 m2;the solution two is with air heat exchange area of 13 494.4 m2 and air flow rate of 105×103 m3/h.Each linear meter of the buried pipes in solution one and two should be matched with 0.086 m2 and 0.123 m2 of air heat exchanger area.After 10 years of continuous operation of the air-soil regenerative heat pump system,the soil temperature of solution one and two drops by 0.23℃ and 0.21℃,respectively.The unit heating area costs of the two solutions are 13.85 yuan and 12.67 yuan,respectively.The solution two is better than the solution one.
soil source heat pumpair heat exchangerheat storagesoil temperature rise
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