An adaptive defrosting method for air-cooled heat pump units

Abstract

The invention discloses a self-adaption defrosting method of an air-cooled heat pump unit. Before the unit starts defrosting, the method comprises following steps: S1, whether the difference value of the temperature of a first fin and the temperature of a second fin is larger than the frost deposit temperature difference or not is judged, and if the difference value is larger than the frost deposit temperature difference, the step S2 is executed, wherein the fin temperature meeting the frost deposit condition time is the first fin temperature, and the fin temperature meeting the defrosting condition time is the second fin temperature; S2, whether the frost deposit time meets the preset time interval or not is judged, if the frost deposit time meets the preset time interval, defrosting is carried out, or the step S1 is executed; the method has the beneficial effects that according to different defrosting retreating conditions, the frost deposit temperature difference and the preset time interval of next-time defrosting can be determined, the defrosting state of the air-cooled heat pump unit can be accurately pre-judged, the air-cooled heat pump unit can be effectively controlled to execute the defrosting action, the effects that defrosting is effectively achieved, defrosting is not needed when no frost deposit exists, and defrosting is accurate are achieved, and the energy efficiency is improved.

Description

technical field [0001] The invention relates to the field of air conditioning, and more specifically relates to an adaptive defrosting method for an air-cooled heat pump unit. Background technique [0002] When the air-cooled heat pump unit is running in winter, due to the low ambient temperature, frost will appear on the fin heat exchanger. Due to the existence of the frost layer, the heat transfer resistance between the heat exchanger and the ambient air increases, which reduces the ability of the heat exchanger to absorb heat. Therefore, if the defrosting is not timely and effective, the operating efficiency of the heat pump unit in winter will be greatly reduced. Existing air-cooled heat pump units usually use the reverse defrosting method, but this defrosting method must consume energy during the defrosting process, and some commonly used defrosting methods are based on the outdoor temperature and the fin temperature. According to the basis, there are more or less some...

AI Technical Summary

Problems solved by technology

Due to the existence of the frost layer, the heat transfer resistance between the heat exchanger and the ambient air increases, which reduces the ability of the heat exchanger to absorb heat. Therefore, if the defrosting is not timely and effective, the operating efficiency of the heat pump unit in winter will be greatly reduced.

Existing air-cooled heat pump units usually use the reverse defrosting method, but this defrosting method must consume energy during the defrosting process, and some commonly used defrosting methods are based on the outdoor temperature and the fin temperature. According to the basis, there are more or less some problems, such as redundant defrosting actions, or not sending out signals when defrosting is required.

[0003] Therefore, the existing defrosting methods all have the following disadvantages: 1) There may be redundant defrosting actions, resulting in insufficient heating

2) It may not be possible to completely defrost, resulting in low heating efficiency

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