Electronic expansion valve control method and refrigerant circulation system

Abstract

The invention provides an electronic expansion valve control method and a refrigerant circulation system. The control method comprises the steps of acquiring a current actual degree of superheat delta' and a current actual degree of supercooling epsilon' of the refrigerant circulation system; obtaining a first comparing result by comparing the actual degree of superheat delta' with a preset degree of superheat threshold value delta or a preset degree of superheat range [delta 1, delta 2], wherein the delta 1 is a first degree of superheat threshold value, and the delta 2 is a second degree ofsuperheat threshold value; obtaining a second comparing result by comparing the actual degree of supercooling epsilon' and a preset degree of supercooling threshold value epsilon or a preset degree of supercooling range [epsilon 1, epsilon 2], wherein the epsilon 1 is a first degree of supercooling threshold value, and the epsilon 2 is a second degree of supercooling threshold value; and adjusting the opening degree of an electronic expansion valve by comprehensively comparing the first comparing result and the second comparing result. According to the control method of the electronic expansion valve, heat exchange capacity and energy efficiency of the system can be improved while gas suction with liquid is avoided, the structure of system is not changed, and the production cost of the system is not increased.

Description

technical field [0001] The invention relates to the field of automatic control of a refrigerant circulation system, in particular to a control method of an electronic expansion valve and a refrigerant circulation system. Background technique [0002] Existing refrigerant circulation systems such as heat pump systems generally adjust the opening of the electronic expansion valve according to the degree of suction superheat to meet system reliability under different working conditions. When operating under low temperature conditions, it is basically difficult for the evaporator to have superheat (that is, the superheat is 0 or a negative value), which leads to unreliable adjustment of the opening of the electronic expansion valve under low temperature conditions, which in turn affects the performance and operation reliability of the heat pump system. . Contents of the invention [0003] In view of this, one of the objectives of the present invention is to provide a method f...

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Problems solved by technology

[0002] Existing refrigerant circulation systems such as heat pump systems generally adjust the opening of the electronic expansion valve according to the degree of suction superheat to meet system reliability under different working conditions. When operating under low temperature conditions, it is basically difficult for the evaporator to have superheat (that is, the superheat is 0 or a negative value), which leads to unreliable adjustment of the opening of the electronic expansion valve under low temperature conditions, which in turn affects the performance and operation reliability of the heat pump system.

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