一种新型变浓度热泵系统的实验研究

Experimental Study on New Variable Composition Heat Pump System

为了解决空气源热泵系统冬季制热量不足的问题,提出了一种新型变浓度容量调节热泵系统,使用环保型工质R32/R134a进行了固定工况下变浓度稳态实验和变工况下定浓度和变浓度稳态性能对比实验．实验结果表明:固定工况下系统的制热量、压缩机耗功量和性能系数均随着低沸点质量分数的增加而增加;变工况下的变浓度运行比定浓度运行能更好地抑制制热量的下降,当蒸发器进口温度为-14℃时可使系统的性能系数提高5%,表现出相对于常规系统更节能的优势．实验结果验证了提出的实验装置具有调节系统循环工质浓度和随负荷变化调节系统容量的调节特性．

A new heat pump system with variable composition was proposed to enhance heating capacity of air source heat pumps in winter. Experimental research was conducted under different operating conditions using mixture refrigerant R32/R134a. The results show that heating capacity, power consumption and coefficient of performance （COP） of the system increased as the com- position of the highly volatile component of the mixture refrigerant increased. Compared with constant compositions, the heating capacity of the system with variable compositions at lower ambient temperatures was higher and its COP could increase by 5% when the inlet temperature of the evaporator was -14℃. The capacity of the heat pump can be continuously adjusted to meet the requirements of the heating load.