Method for preventing frost from being formed on evaporator and air conditioner

Abstract

The invention provides a method for preventing frost from being formed on an evaporator and an air conditioner. The method for preventing frost from being formed on the evaporator comprises the stepsthat condenser outer plate temperature is obtained in a low-temperature refrigeration mode; if the condenser outer plate temperature is lower than a condenser outer plate temperature threshold value,the continuous working time of condenser refrigeration is obtained; if the continuous working time of condenser refrigeration is greater than a condenser refrigeration working time threshold value, adefrosting mode is enabled, wherein the continuous working time is the continuous refrigeration working time of the condenser after the condenser outer plate temperature is lower than the condenser outer plate temperature threshold value. According to the method for preventing frost from being formed on the evaporator and the air conditioner, the frosting situation of the evaporator can be accurately judged during low-temperature refrigeration by detecting the condenser outer plate temperature and the operating situation of a compressor, thus frost is effectively prevented from being formed onthe evaporator, and the abnormal situation is avoided.

Description

technical field [0001] The invention relates to the technical field of air conditioners, in particular to a method for preventing evaporator from frosting under the condition of low-temperature refrigeration and an air conditioner. Background technique [0002] At present, air conditioner refrigeration prevents the evaporator from frosting mainly by sensing the temperature in the middle of the evaporator and judging the frosting situation of the evaporator, and then defrosting by stopping the compressor and turning on the inner fan. Generally, there is no problem in use, but in special cases, the outdoor temperature is too low and there is a cooling demand at the same time, resulting in too low system pressure and too low evaporation pressure, resulting in partial frost on the evaporator, and the temperature in the middle of the evaporator is the temperature of the superheated refrigerant, which cannot Accurately determine the frosting condition of the evaporator. Contents...

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Problems solved by technology

[0002] At present, air conditioner refrigeration prevents the evaporator from frosting mainly by sensing the temperature in the middle of the evaporator and judging the frosting situation of the evaporator, and then defrosting by stopping the compressor and turning on the inner fan. Generally, there is no problem in use, but in special cases, the outdoor temperature is too low and there is a cooling demand at the same time, resulting in too low system pressure and too low evaporation pressure, resulting in partial frost on the evaporator, and the temperature in the middle of the evaporator is the temperature of the superheated refrigerant, which cannot Accurately determine the evaporator frost situation

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