带气液调配蒸发器空气源热泵热水器的实验研究

Experimental Study on Air-source Heat Pump Water Heater with Vapor-liquid Adjustment Evaporator

气液调配蒸发器通过调整干度和质量流速实现传热性能提升。分别将两个管程布置为4-2-4-6-4(蒸发器1)和5-4-3-4-4(蒸发器2)的气液调配蒸发器用于热泵热水器中(分别为系统A和系统B)进行实验,并进行了对比研究。结果表明:相比于蒸发器1,蒸发器2制冷剂分布更均匀,且蒸发器侧压降减小了10.91%。在名义工况下,相比于系统A,系统B制热量减少1.69%,功率也减少1.45%,两个系统COP基本相同。系统B的排气压力比系统A小26.35~84.78 kPa,更有利于压缩机的安全运行;在不同的环境温度下,系统B的压缩机功耗均小于系统A,当环境温度为30℃时,系统B的性能比系统A提高了2.1%。

A vapor-liquid adjustment evaporator exhibits superior heat transfer performance by adjusting vapor quality and mass flux.In this study,two vapor-liquid adjustment evaporators with circuitries of 4-2-4-6-4(evaporator 1)and 5-4-3-4-4-4(evaporator 2)are applied to heat pump water heaters(respectively referred to as systems A and B),and an experimental comparative study is conducted.The results show that compared with that in evaporator 1,the refrigerant is more uniformly distributed in evaporator 2,and its pressure drop is reduced by 10.91%.Under nominal working conditions,the heating capacity and power consumption of system B are reduced by 1.69%and 1.45%,respectively,compared to system A;the coefficients of performance(COPs)of the two systems are generally the same.The pressure at the compressor outlet of system B is 26.35-84.78 kPa lower than that of system A;this range is conducive to the safe operation of the compressor.At different ambient temperatures,the power consumption of the compressor of system B is lower than that of system A.When the ambient temperature is 30℃,the COP of system B is 2.1%higher than that of system A.