Defrosting control method for air source heat pump unit

Abstract

The invention provides a defrosting control method for an air source heat pump unit. The air source heat pump unit is provided with an outdoor ambient temperature sensor, an outdoor ambient humidity transmitter and a surface air cooler fin temperature sensor. A control unit of the air source heat pump unit is connected with the outdoor ambient temperature sensor, the outdoor ambient humidity transmitter and the surface air cooler fin temperature sensor. The defrosting control method comprises the following steps that 1, the dew point temperature is calculated through the outdoor temperature and the outdoor humidity; 2, the air source heat pump unit enters into first defrosting; 3, the air source heat pump unit enters into automatic defrosting; and 4, the air source heat pump unit exits defrosting. The defrosting control method for the air source heat pump unit has the beneficial effects that in a region with the large humidity, the air source heat pump unit is accurately controlled toenter into and exit defrosting, so that accumulating of frost on a surface air cooler is avoided, and defrosting is clean and thorough; and when the temperature is low, whether the air source heat pump unit needs to enter into defrosting or not is judged accurately, so that the situation that the unit frequently enters into defrosting is avoided, intelligent judgment and automatic adjustment of the defrosting time and interval are achieved, the heating effect of the air source heat pump unit is improved, and energy consumption is low.

Description

technical field [0001] The invention relates to the technical field of air source heat pump units, in particular to a defrosting control method for air source heat pump units. Background technique [0002] The current air source heat pump unit judges whether the air source heat pump unit enters defrosting according to the outdoor ambient temperature, fin temperature and defrosting interval. The defrosting process does not heat. At this time, if the exhaust gas temperature is low and the weather is too cold, the defrosting will often operate, which will make the indoor heating effect worse. [0003] The current air source heat pump unit has worse heating effect in areas with high humidity. In areas with high humidity, after the air source heat pump unit runs for several defrosting cycles, when the ambient temperature is close to 2°C, the defrosting interval is related to the ambient temperature. If the ambient temperature is high, the defrosting interval will be longer, resu...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a defrosting control method for air source heat pump units to solve the problem of poor heating effect caused by wrong defrosting of current air source heat pump units in areas with high humidity

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