Heat pump water heater defrosting control method and heat pump water heater using method

Abstract

The invention discloses a heat pump water heater defrosting control method and a heat pump water heater using the method. In a heat pump water heater control program, an operation method of adding a forced opening defrosting mode is adopted, so that under the conditions that the weather is very severe and the automatic defrosting fails, the defrosting mode is automatically converted into defrosting at the set time or the manual forced defrosting by users, the defrosting can be continuously carried out, the heating efficiency of the heat pump water heater is enhanced, and the operation reliability is improved. In addition, the heat pump water heater using the method has the advantages that through the monitoring by a monitoring device and the structure matching of an outdoor heat exchanger coil pipe sensor, an outdoor environment sensor, a water inlet monitoring sensor and a water outlet monitoring sensor, the monitoring device controls the operation sequence of the compressor, a gas-liquid separator, a heat exchanger, an electronic expansion valve, a condenser and a four-way valve, the work medium flowing direction is changed, the operation method of adding the forced opening defrosting mode is adopted in the heat pump water heater control program, the operation is convenient, and the structure is reasonable.

Description

technical field [0001] The invention relates to the field of heat pump systems, in particular to a defrosting control method for a heat pump water heater and a heat pump water heater using the method. Background technique [0002] When the current air source heat pump water heater is heating, the fin heat exchanger absorbs heat energy from the air, transports the heat to the water heat exchanger through the refrigerant, exchanges heat with water, and releases the heat into the water storage tank. In winter, the outdoor ambient temperature is low, and the heat energy absorbed by the fin heat exchanger from the air will cause the surface temperature of the heat exchanger to be very low, which can reach or even be far below 0 degrees. Therefore, when the heat pump water heater runs for a long time, frost will form on the surface of the fin heat exchanger, and even ice will form in the cold winter. Frost or ice attached to the surface of the fin heat exchanger will greatly red...

AI Technical Summary

Problems solved by technology

For example, the outdoor environment is very cold, the outdoor ambient temperature sensor and the fin heat exchanger temperature sensor are frozen, isolated from the outside environment, and the temperature of the sensor will no longer change, then the heat pump water heater will not enter the defrosting process, and the heating effect of the heat pump water heater will be improved. and reliability will become poor

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