空气源热泵热水器系统性能优化研究

Research on Optimize System Performance of Air Source Heat Pump Water Heater

空气源热泵热水器在常年高温地区具有广泛的应用市场,为了使系统性能最优化,提高能源利用率,利用空气源热泵热水器实验台,模拟夏季高温下室内环境,对其系统性能进行了实验研究。通过对比不同环境温度下、不同循环水流量和不同电子膨胀阀开度下系统参数的变化,得出一系列结果：系统能效比Ccop（coefficient of performance）随周围环境温度上升先快速增大后缓慢变大;周围环境温度越低,压缩机排气温度越高;在实验温度为23～35℃区间内Ccop平均值在4.0左右,最高可达到5.2。通过控制电子膨胀阀的开度调节制冷剂流量,可准确控制蒸发器出口过热度,解决了系统变工况下运行不稳定的问题,提高了系统的能效比Ccop。

Air source heat pump water heater is used widely in the area of high temperatures all the year round. In order to optimize the system performance and improve the energy utilization rate, by using the system operation performance of air source heat pump and the simulation of indoor environment of high temperature in summer, the system performance was studied. By comparation of the system parameters of different environmental temperatures, different cycle water flows and different electronic expansion valves, the experimental results were obtained. The Coop of heating system first increased rapidly with surroundings temperature rise, and then became larger slowly. The surroundings temperature was lower, and the discharge temperature of the compressor was higher. The medium value of Coop was 4.0 in experimental temperature between 23℃ and 35 ℃, and the highest Ccop was 5.2. Electronic expansion valve adjusted by rapidly regulating refrigerant flow can more accurately control the exit superheat, and it can solve the operating problem of stability and improve Ccop.