A defrosting control method for an intelligent heat pump

Abstract

The invention discloses a defrosting control method for an intelligent heat pump. The defrosting control method for the intelligent heat pump comprises the following steps: according to the starting operation time t1 of a heat pump and the coil pipe temperature T1 of an evaporator, carrying out first-time defrosting judgment; combining with an atmosphere situation to give different defrosting judgment ways; after a difference value between environment temperature and the coil pipe temperature of the evaporator during a rain weather is greater than or equal to a set value, entering a defrostingprocess; during non-rain weathers, according to the water level of condensate water, carrying out subsequent defrosting judgment; when the condensate water is in the presence in a condensate water pan, shortening defrosting time intervals; when the condensate water is in the absence in the condensate water pan, prolonging a defrosting time interval; taking a previous defrosting time interval as areference for the judgment of each defrosting time interval so as to guarantee that the defrosting operation is similar to the operation working condition of the heat pump so as to determine the defrosting time interval; after the defrosting process is started, when the coil pipe temperature of the evaporator achieves a certain value, exiting the defrosting process so as to save energy while comfortable hot water supply experience is provided for users.

Description

technical field [0001] The invention relates to the field of water heaters, in particular to an intelligent heat pump defrosting control method. Background technique [0002] The heat pump cycle can transfer the energy of the low-temperature heat source to the high-temperature heat source. The cycle often includes components such as compressor, evaporator, condenser and expansion valve. However, when the heat pump water heater operates at a lower outdoor temperature in winter, the surface temperature of the evaporator is easy to reach Below zero, the surface of the evaporator is prone to frost. Thick frost will block the air flow on the surface of the evaporator and affect the water heating capacity of the heat pump water heater. Long-term operation may cause a protective shutdown of the system and affect the service life of the entire system. . [0003] Common defrosting methods include stopping the defrosting to let the frost on the surface of the evaporator melt by itsel...

AI Technical Summary

Problems solved by technology

[0002] The heat pump cycle can transfer the energy of the low-temperature heat source to the high-temperature heat source. The cycle often includes components such as compressor, evaporator, condenser and expansion valve. However, when the heat pump water heater operates at a lower outdoor temperature in winter, the surface temperature of the evaporator is easy to reach Below zero, the surface of the evaporator is prone to frost. Thick frost will block the air flow on the surface of the evaporator and affect the water heating capacity of the heat pump water heater. Long-term operation may cause a protective shutdown of the system and affect the service life of the entire system.

[0003] Common defrosting methods include stopping the defrosting to let the frost on the surface of the evaporator melt by itself, and the other is to change the flow direction of the working fluid through the reversing valve and use reverse cycle defrosting. The normal supply of hot water greatly affects the performance of the heat pump water heater, so making a correct judgment on the defrosting frequency and defrosting interval of the heat pump water heater can greatly improve the performance of the heat pump water heater, provide a comfortable user experience and Energy saving

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