Defrosting method of air conditioner air-cooled heat pump unit and air conditioner air-cooled heat pump unit

Abstract

The invention provides a defrosting method of an air conditioner air-cooled heat pump unit, which includes the following steps: step 1 judging whether operation time timing from exit of last defrosting meet requirements for defrosting spacing interval before starting defrosting; step 2 if the requirements for defrosting spacing interval can be met, performing defrosting, and if the requirements cannot be met, returning to step 1. The defrosting spacing interval can be determined according to the following steps: when the last defrosting exits, detecting fin temperature of an evaporator and comparing the detected temperature with a set temperature; when the fin temperature is larger than the set temperature, choosing time value for the defrosting spacing interval according to the last defrosting time; and when the fin temperature is smaller than the set temperature, choosing the defrosting spacing interval as a fixed value. The invention further provides the air conditioner air-cooled heat pump unit, which comprises a defrosting controller for controlling the unit to perform defrosting in the chosen defrosting spacing interval according to the evaporation fin temperature and outdoor environment temperature, so that the defrosting spacing interval can be reasonable.

Description

technical field [0001] The invention relates to, in particular, to a defrosting method for an air-conditioning air-cooled heat pump unit and an air-conditioning air-cooled heat pump unit. Background technique [0002] Along with the raising of people's living standard, the popularization rate of air conditioner increases year by year. In refrigeration systems, frosting is one of the most common phenomena in system operation. For heat pump air conditioners in heating operation, when the surface temperature of the evaporator is lower than zero, frost will appear on the surface of the heat exchanger. If the frost on the heat exchange surface is not removed in time, it will block the air passage and reduce the heat transfer area. The flow resistance of the air increases significantly, the heat exchange efficiency decreases, and the overall performance of the unit decreases. Accurate control of defrosting time and times in heat exchanger operation and defrosting cycles is the k...

AI Technical Summary

Problems solved by technology

When the unit is in a low-temperature and high-humidity environment, the frosting speed will be very fast, causing the surface temperature of the evaporator to reach the set value, but the running time does not meet the requirements, and the defrosting cannot be performed, and the problem of unclean defrosting will occur.

When the unit is in a high temperature and low humidity environment, the frosting speed is slow, so that the surface temperature of the evaporator and the running time meet the requirements, but there is little frosting on the surface of the evaporator, and the unit enters the defrosting operation, which will cause unnecessary power consumption and user supply water temperature fluctuations

Therefore, the defrosting interval control in the prior art is unreasonable

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