制冷剂流量控制法在风冷热泵除霜中的应用

摘要

Based on the difference of refrigerant flux between refrigeration operating condition and heating operating condition in a heat-pump air-conditioning system, the refrigerant flux in the heat-pump air-conditioning system was controlled by refrigerant flux control method. And the combined method with refrigerant flux control and hot gas bypass defrosting was applied in heat-pump defrosting. The results show that the heat-pump air-conditioning cycling system with refrigerant flux control can be used to restrain or retard frosting in the surface of outdoor heat-exchanger while this system works in order. When the surface of outdoor heat-exchanger was already covered with frost, this system could be used to accelerate defrosting or shorten defrosting time.%根据热泵空调系统中制冷工况和制热工况时制冷剂流量的差别,采用制冷剂流量控制法对热泵空调系统中的制冷剂流量进行控制,并将制冷剂流量控制法与热气旁通法除霜相结合应用于热泵除霜过程中。结果表明,在控制制冷剂流量的热泵空调系统中,系统正常运行时,该循环系统能抑制或减缓室外换热器表面的结霜;当室外换热器表面结霜时,则可加速除霜,缩短除霜时间。