Method for judging defrosting of heat pump water heater
A technology for heat pump water heaters and outdoor unit heat exchangers, applied in refrigeration and liquefaction, lighting and heating equipment, damage protection, etc., can solve the problem of endless frost, unstable heat fluctuations, and poor judgment of outdoor heat transfer Whether the device is frosted or not, to achieve accurate control, restore heating operation, and improve heating efficiency
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[0020] The invention will be described in detail below with reference to the drawings and embodiments.
[0021] In the present invention, a special defrosting temperature sensor is separately arranged on the outdoor heat exchanger, and the position of the defrosting temperature sensor is set after the evaporation temperature sensor, and is determined according to the refrigerant flow direction of the outdoor heat exchanger in the heating cycle. The temperature difference between the defrosting temperature sensor and the original evaporation temperature sensor, that is, the heat exchange effect of the refrigerant in the outdoor heat exchanger, is used to determine whether the outdoor heat exchanger is frosted and whether the defrosting is complete.
[0022] figure 1 It is a schematic diagram of the outdoor unit heat exchanger of the air source heat pump water heater. In the heating mode, the outdoor heat exchanger is used as the evaporator. In this embodiment, the outdoor unit heat e...
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