室外工况对蓄能型空气源热泵热水机组性能的影响

EFFECT OF OUTDOOR CONDITIONS ON CHARACTERISTICS OF ENERGY-STORAGE AIR SOURCE HEAT PUMP WATER HEATER UNIT

为了解室外参数改变对蓄能型空气源热泵热水机组性能的影响,研制实验样机,在不同的室外环境工况下,对机组在多种模式下的性能进行对比实验研究。结果表明,蓄热模式下,机组平均EER随室外温度的降低而减小,且蓄热时间随室外温度的降低而延长。在蓄热蓄冷模式下,机组能回收近一半的蒸发冷量,加大蓄冷罐的容积可增加回收制冷量,有利于提高机组平均EER。机组在供热水模式下,由于循环热水流量较大,对蓄热罐内水扰动较强,会出现供水中断的情况,中断时间随室外温度的降低而延长。

In order to understand the effect of parameters of outdoor air on characteristics of energy-storage air source heat pump water heater unit, the prototype was developed and some experimental tests on performance of unit in different operation modes were conducted. The results showed that the mean EER and energy-saving impact reduces with the decrease of temperature of outdoor air in the mode of energy storage. However, the time of energy storage is extended with the decrease of temperature of outdoor air. In the mode of heat storage and cooling storage, the unit can recover half of the cooling of evaporator and the enlargement of capacity of tank of cooling storage can increase the cooling amount. In the mode of supplying hot water, there exists a break of hot water supply because the high flowrate of circulation water causes intensive disturbance in the tank of heat storage. Moreover, the time of break is prolonged with the decrease of temperature of outdoor air.