Defrosting control method for intelligent air cooling heat pump

Abstract

The invention discloses a defrosting control method for an intelligent air cooling heat pump, belonging to the field of refrigeration and air conditioning. The method comprises the following steps: when an air conditioner is started for heating, a controller detects the outdoor ambient temperature and the temperature of a coiled tube of an outdoor heat exchanger; when the temperature of the coiled tube of the outdoor heat exchanger is lower than the preset frosting temperature of the coiled tube, the coiled tube is judged to be frosted, and the difference between the outdoor ambient temperature and the temperature of the coiled tube of the outdoor heat exchanger at the moment is recorded as the initial frosting temperature difference of the coiled tube; and then the difference between the outdoor ambient temperature and the temperature of the coiled tube of the outdoor heat exchanger is dynamically recorded and judged, and when the difference between the difference and the initial frosting temperature difference of the coiled tube recorded previously is greater than the temperature difference of a preset allowable frosting thickness, and the operation time of a compressor is longer than the preset unstable operation time of the compressor, the air conditioner enters a defrosting mode. The invention has the beneficial effects that: defrosting is carried out only when frost is formed, the defrosting frequency of the compressor and time for defrosting every time are reduced, an unnecessary defrosting period is reduced, and the effects of saving electricity and prolonging the service life of equipment are achieved.

Description

technical field [0001] The invention belongs to the technical field of air conditioners. Specifically, it is an intelligent air-cooled heat pump defrosting control method. Background technique [0002] When the air-cooled heat pump unit is running in winter, when the temperature of the outdoor heat exchanger coil is lower than the dew point temperature, condensed water will be generated on the surface, and once the condensed water is lower than 0°C (varies according to the regional atmospheric pressure value), frost will form . If the surface of the heat exchanger coil is frosted due to low temperature, it will inevitably reduce the efficiency of heat exchange. Although the condensed water freezes during frosting, the total amount of latent heat exchange is still equal, but the ice layer on the coil will not only reduce the heat exchange area, but also reduce the air volume that can pass through. As the frost builds up, the air-to-coil heat exchange efficiency, that is, t...

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Problems solved by technology

However, due to the two-way limitation of the running time of the compressor and the temperature of the outdoor heat exchanger coil, in this method, the unit should not defrost and enter the defrosting, and defrosting is required but the defrosting is postponed; if the air humidity is very high In a large environment, when the frost layer on the surface of the heat exchanger is very thick, which has seriously affected the air volume and heat exchange effect, and it is urgent to defrost, but the running time of the compressor has not reached the set time, the unit is still at a relatively low evaporation temperature It not only affects the heating effect of the unit, but also consumes a lot of energy. For example, in a low-temperature environment and the air moisture content is relatively small, even if there is no frost on the surface of the heat exchanger, when the running time of the compressor is up, it must enter the chemical state. Therefore, the normal heating operation time of the unit is greatly reduced, the energy consumption increases, and the heating effect is affected

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