Abstract
CO2 heat pump is a new type refrigeration equipment of energy saving, environmental protection and high efficiency, it is the basic direction of future sustainable development in HVAC. But it runs in winter, because of the influence of the external environment will be the formation of frost on the evaporator surface, thereby reducing the heat capacity of heat pump units, even in normal operation. Combined with the practical application of CO2 heat pump, the design of a PLC based intelligent defrosting system; this system is a good solution to the CO2 heat pump, low temperature and high humidity environment of the defrosting problem.
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