HEAT PUMP WITH IMPROVED DEFROST CYCLE AND METHOD OF DEFROSTING A HEAT EXCHANGER
    1.
    发明申请
    HEAT PUMP WITH IMPROVED DEFROST CYCLE AND METHOD OF DEFROSTING A HEAT EXCHANGER 审中-公开
    具有改进的缺陷循环的热泵和除热换热器的方法

    公开(公告)号:US20130312436A1

    公开(公告)日:2013-11-28

    申请号:US13477973

    申请日:2012-05-22

    IPC分类号: F25D21/06 F25B41/04 F25B47/02

    摘要: Heat pumps with improved defrost cycles, methods of defrosting heat exchangers, and methods of improving the effectiveness of defrost cycles of heat pumps, for example, having a microchannel outdoor heat exchanger. A defrost valve in a refrigerant conduit opens during a defrost cycle to deliver hot refrigerant gas to a portion of the heat exchanger that otherwise defrosts more slowly or less completely than other portions of the heat exchanger. Particular embodiments pass hot refrigerant gas through a header of the heat exchanger, such as a bottom header. In a number of embodiments, the defrost valve is open only during a portion of the defrost cycle. Further, in some embodiments, the fan that is used to blow air through the heat exchanger is operated in a reversed direction during at least part of the defrost cycle to counteract natural convection through the heat exchanger.

    摘要翻译: 具有改善的除霜循环的热泵,除热换热器的方法,以及提高热泵除霜循环的有效性的方法,例如具有微通道室外热交换器。 在除霜循环期间,制冷剂导管中的除霜阀打开,以将热的制冷剂气体输送到热交换器的一部分,否则与热交换器的其它部分相比,其除霜更慢或更少。 特定实施例使热的制冷剂气体通过热交换器的集管,例如底部集管。 在许多实施例中,除霜阀仅在除霜循环的一部分期间打开。 此外,在一些实施例中,用于吹送空气通过热交换器的风扇在除霜周期的至少一部分期间以相反的方向操作以抵消通过热交换器的自然对流。