Intelligent type defrosting control system for heat pump

Abstract

The invention discloses an intelligent type defrosting control system for a heat pump. The intelligent type defrosting control system for the heat pump comprises a control unit, an environment temperature probe, an evaporator temperature probe, a condensate water level detector, a rainwater sensor and a timer, and the bottom of a condensate water receiving tray is provided with a drainage opening.The position, away from the condensate water receiving tray, of the drainage opening is provided with a solenoid valve. The system performs defrosting judgment of the first time after sensing the starting-up operation time t1 of the heat pump and the temperature T1 of an evaporator coil; in the rainwater weather, the system senses the temperature T1 of the evaporator coil and the environment temperature TE and determines the defrosting time interval; in the non-rainwater weather, the system senses the condensate water level and conducts subsequent defrosting judgment with the defrosting timeof last time as reference; and after the defrosting process is started, after the temperature T1 of the evaporator coil is higher than the preset temperature TS2, the system quits from the defrostingprocess. By means of the intelligent type defrosting control system, the comfortable water using experience can be provided for users, and energy waste caused by frequent defrosting conducted in winter is avoided.

Description

technical field [0001] The invention relates to the field of water heaters, in particular to an intelligent heat pump defrosting control system. 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 methods of defrosting include stopping the machine to defrost and let the frost on the surface of the evaporator melt by itself. 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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