Theoretical analysis on regulating modes of air source heat pump system for central heating
Air source heat pump(ASHP)has been widely used in Northern China for central heating.However,there is few research on its regulating modes till now.To im-prove the energy-saving effect of AHSP,a simulation model considering the energy loss caused by frosting/defrosting and on-off,is developed.Based on this model,three regula-ting modes suitable for ASHP are proposed.Then the central heating systems in Beijing and six other cities are investigated using this model.The results show that both the ener-gy loss corrections of frosting/defrosting and on-off have evident impacts on the power consumption and seasonal coefficient of performance(SCOP);the power consumption of unit is increased by 3.85％-17.41％,and SCOP of unit is decreased by 3.72％-14.83％caused by frosting/defrosting correction.The influence of the energy loss caused by on-off decreases gradually with the increase of heating area.Using different regulating modes,power consumption of ASHP unit changes slightly,while the energy-saving rate of water pump could reach 80.97％-86.46％,and the energy-saving rate of system could reach 8.47％-11.87％.
air source heat pumpcentral heatingenergy loss correction of frosting/defrostingenergy loss correction of on-offregulating
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