Heat pump assembly, defrost control method and storage medium

Abstract

The present invention proposes a heat pump assembly, a defrosting control method, and a storage medium, wherein the heat pump assembly includes: a first temperature sensor disposed on a finned heat exchanger; one end of a first refrigerant return branch is disposed on a first On the refrigerant inflow branch, the other end of the first refrigerant branch is set on the second refrigerant outflow branch; one end of the second refrigerant return branch is set on the second refrigerant inflow branch, and the other end of the second refrigerant branch is set on the second refrigerant branch. A refrigerant outflow branch; the first control valve and the second control valve control the conduction of the second refrigerant return branch when the temperature of the first outlet pipe is lower than the defrosting temperature and the temperature of the second outlet pipe is greater than or equal to the defrosting temperature , when the temperature of the second outlet pipe is lower than the defrosting temperature and the temperature of the first outlet pipe is greater than or equal to the defrosting temperature, the first refrigerant return branch is controlled to be turned on. Through the technical solution of the invention, the probability of failing to enter the defrosting mode due to uneven frosting of the finned heat exchanger is reduced.

Description

technical field [0001] The present invention relates to the field of air source heat pumps, in particular to a heat pump assembly, a defrosting control method and a computer-readable storage medium. Background technique [0002] In the related art, when the heat pump components are heating and running at a lower ambient temperature, the finned heat exchanger is prone to frosting. For a single system component, when there are multiple finned heat exchangers, due to Uneven frosting on the wind side heat exchanger is caused by the difference in air intake conditions and the deviation of the system pipeline. [0003] The current defrosting scheme is to judge defrosting based on a certain heat exchanger parameter. There will be situations where the frost layer on one side of the heat exchanger is thick enough to meet the defrosting conditions, while the frost layer on the other side is thinner, and the system does not enter the defrosting situation. When a single system componen...

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Problems solved by technology

[0002] In the related art, when the heat pump components are heating and running at a lower ambient temperature, the finned heat exchanger is prone to frosting. For a single system component, when there are multiple finned heat exchangers, due to Uneven frosting on the wind-side heat exchanger due to differences in air intake conditions and system piping deflection

[0003] The current defrosting scheme is to judge defrosting based on a certain heat exchanger parameter. There will be situations where the frost layer on one side of the heat exchanger is thick enough to meet the defrosting conditions, while the frost layer on the other side is thinner, and the system does not enter the defrosting situation. When a single system component runs for a long time under the condition that one finned heat exchanger has a thicker frost layer and the other has a thinner frost layer, the heat transfer efficiency will be low, and at the same time, there will be shutdown protection phenomena such as system high pressure protection. so as to reduce the operating efficiency of the components

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