Air conditioning defrosting method

Abstract

The invention discloses an air conditioning defrosting method, and relates to the field of air conditioners. The method can be used for optimizing air conditioning defrosting. The air conditioning defrosting method comprises the following steps that a refrigerant circulating system of an air conditioner is in a heating cycle; whether each second heat exchanger meets the start defrosting conditionor not is judged, wherein the start defrosting condition refers that the exhaust temperature TP of a compressor is larger than the start defrosting exhaust set temperature TPS; and if the second heatexchangers meet the defrosting condition, each second heat exchanger is switched to a defrosting mode according to a set sequence; and the defrosting mode refers to break a heating circulation branchwhere the to-be-defrosted second heat exchanger is located, and the outlet of the compressor is enabled to be in communication with a bypass branch of the to-be-defrosted second heat exchanger. According to the technical scheme, bypass branch defrosting is adopted, the defrosting entering condition of the second heat exchangers is set, thus defrosting is carried out under the proper condition, thetemperature of the defrosting refrigerant is guaranteed, the defrosting effect is improved, and the defrosting duration is shortened.

Description

technical field [0001] The invention relates to the field of air conditioners, in particular to an air conditioner defrosting method. Background technique [0002] For low-temperature heating air-cooled screw units, the fins of the outdoor heat exchanger are evaporators during heating, and the fins will frost due to the low air temperature. If the frost is not defrosted in time, the frost layer attached to the fin surface will affect the heat transfer. The conventional defrosting method is to use a four-way reversing valve. By switching the four-way valve and reverse circulation of the refrigerant, the outdoor heat exchanger is defrosted. [0003] The inventor found that at least the following problems exist in the prior art: the existing defrosting method needs to switch the four-way valve, and the long-term operation of the four-way valve will cause mechanical strain; in addition, defrosting through the reverse cycle of the refrigerant will affect the comfort of the user ...

AI Technical Summary

Problems solved by technology

[0003] The inventor found that at least the following problems exist in the prior art: the existing defrosting method needs to switch the four-way valve, and the long-term operation of the four-way valve will cause mechanical strain; in addition, defrosting through the reverse cycle of the refrigerant will affect the comfort of the user to experience

Images