摘要
试验对比一台户用整体式空气源热泵机组的3种除霜方案:旁通制冷膨胀阀、风机提前启动和热气旁通融霜。结果表明,用外径16 mm的铜管旁通制冷膨胀阀是比较适合测试样机的除霜方法,在-3℃/90%工况下除霜时间由205 s缩短至99 s;当除霜温度设定为0℃时,提前启动风机可以避免系统的高低压出现大幅度的波动;而热气旁通融霜会导致机组的制热能力下降,但有利于机组在低温工况下的运行稳定性。最后对试验需要改进的地方进行简要说明。
Compares and analyzes three defrosting methods for the household air-source heat pump experimentally： by-pass refrigeration expansion valve,fan pre-start and hot gas by-pass defrosting.The experiment results show that the by-pass refrigeration expansion valve with an OD16 mm copper tube is a better defrosting method,the defrosting time is reduced from 205 s to 99 s under-3 ℃/90%;the method of fan pre-start can avoid the large pressure fluctuation with the setting defrosting temperature of 0 ℃;the third method is beneficial to the operation stability of unit under the low temperature condition,but leads to lower heating capacity.Finally,illuminates simply some improvement advices for the experiment.
出处
《制冷与空调》
2011年第5期62-66,共5页
Refrigeration and Air-Conditioning
关键词
户用
空气源
热泵机组
除霜
翅片管换热器
household
air-source
heat pump unit
defrosting
finned tube heat exchanger
