相变蓄热太阳能空气源热泵复合供暖性能研究OA

A solar air-source heat pump combined heat-ing system with a phase-change thermal storage water tank(hereinafter referred to as the combined heating system)is proposed.The air-source heat pump in the system is equipped with a defrosting heat exchanger,enabling heating while defrosting.The conventional combined heating system(without phase-change mate-rials in the hot water storage tank,and the air-source heat pump not equipped with a defrosting heat ex-changer,only realizing defrosting by switching the flow direction of the refrigerant through a four-way valve)is taken as the comparison system.Combined with practi-cal cases,a simulation method is used to comparatively analyze the indoor temperature stability,power con-sumption,and system coefficient of performance(COP)of the two systems,and simulate and calculate the heating proportion of the solar collector,phase-change thermal storage water tank,and air-source heat pump in the combined heating system.Compared with the conventional combined heating sys-tem,the combined heating system can maintain stable indoor temperature during the defrosting phase,effec-tively improving heating quality.The power consump-tion of the combined heating system during the heating period is 1,822.38 kW·h,while that of the conven-tional combined heating system is 2,105.19 kW·h.Compared with the conventional combined heating sys-tem,the power consumption of the combined heating system during the heating period is reduced by 13.4％.The monthly COP of the combined heating system is higher than that of the conventional combined heating system.The average COP of the combined heating sys-tem and the conventional combined heating system dur-ing the heating period is 3.58 and 3.16.The combined heating system mainly uses phase-change heat storage water tank and air-source heat pump for heating at night.With the increase of the heating proportion of so-lar collectors at sunrise,it can completely rely on solar collectors for heating around noon.