分液热泵空调系统的制热性能研究

随着热泵空调的普及,热泵空调的能耗占比不断增大,其节能问题成为了关注焦点。换热器对系统性能有着重要的影响,如何通过改进换热器来提升系统性能则成为了研究的热点。其中分液冷凝器作为一种新型的换热设备,能对系统制冷性能产生积极影响。但热泵空调系统在制热工况下,分液冷凝器变成气液分离式蒸发器,其系统制热性能尚未可知。通过实验研究,调整毛细管长度和制冷剂充注量,发现在国家标准工况下分液热泵空调系统的最大制热量比原系统高4.50%,C OP比原系统高7.93%,所对应的毛细管长度为700 mm,制冷剂充注量为700 g。且制冷剂过充注的情况下,分液热泵空调系统的制热性能比较稳定。

Heating performance of a heat pump air conditioning system with liquid-separation

Heat pump air conditioning system is becoming more and more popular. It consumes a large percentage of the total energy consumption all over the world, and its energy saving is the major concern. The heat exchangers significantly influence the system performance. How to improve the system efficiency by the heat exchanger has received the increasing attention. The liquid-separation condenser is a newly developed heat exchanger that positively impacts the cooling performance of the system. When it operates at heating mode, the liquid-separation condenser becomes liquid-separation evaporator, and its influence on the heating performance of the system has never been reported. This paper presents an experimental study on the heating performance of the heat pump air conditioning system with a liquid-separation evaporator under the nominal operating condition based on Chinese standard. The maximum heating performance is achieved by adjusting the capillary tube length and refrigerant charge, its maximum heating capacity is 4.50% higher than that of the prototype heat pump air conditioning system, COP is 7.93% higher than that of the prototype system. And the corresponding capillary tube length is 700mm and the refrigerant charge is 700g. Moreover, its performance is relatively steady at the conditions of overcharged refrigerant.