The ambient temperature and the water temperature in the tank are important factors affecting the performance of air source heat pump water heater(ASHPWH),the coefficient of performance(COP) about an air source heat pump water heater during water heating and hot water supplying were tested in enthalpy-difference test-bed.The main tested results are as follows:theCOP of ASHPWH is more than 3 when the water demand is guaranteed at the temperature of 45 ℃ with the ambient temperature above 20 ℃,theCOP of ASHPWH is more than 4 when the water demand is guaranteed at the temperature of 50 ℃ with the ambient temperature above 30 ℃,theCOP of ASHPWH maintains at around 2 when the water demand is guaranteed at the temperature of 40 ℃ with the ambient temperature below 2 ℃.In accordance with the typical annul average daily temperature distribution,5 temperature ranges are divided.The operating performance of each temperature range was characterized by theCOP of the water heating stage under 5 tested conditions.Considering the influence of seasonal cold degree on the frequency of water consumption,given constant heating capacity,the annul performance of the tested ASHPWH is evaluated respectively in cold area,hot summer and cold winter area,hot summer and warm winter area.It is shown that ASHPWH is most applicable in hot summer and warm winter area,it also has the potential to be used in cold areas.%环境及水箱温度是影响空气源热泵热水器运行性能的重要因素,借助焓差试验台测试了5个不同环境温度条件下热水器的非用水及用水过程的能效系数.结果表明,在20℃以上环境中,保证45℃供水时,热水器COP均为3以上,尤其在30℃以上环境中,提供50℃用水时COP达到4以上;在2℃及以下环境中,保证40℃用水时COP维持在2左右.按照标准年日平均温度分布划分5个温度区间,分别以已经测试的5个工况中用水加热阶段的能效表征每个温度区间的运行性能,给定日用水制热量,考虑寒冷程度对用水频率的影响,评价了寒冷地区、夏热冬冷地区及夏热冬暖地区的全年运行综合能效,结果表明:夏热冬暖地区空气源热泵热水器最具适用性,寒冷地区也具有推广使用的潜力.
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