Defrosting control method for air conditioning unit

Abstract

The invention belongs to the technical field of air conditioners, particularly relates to a defrosting control method for an air conditioning unit, and aims to solve the problem that when an existing air conditioning unit uses a fixed preset coil pipe temperature and preset defrosting interval time for determination, misjudgment is likely to occur. Therefore, the defrosting control method comprises the steps that under the condition that the number of times of operating an outdoor unit defrosting mode after the air conditioning unit is started this time exceeds a preset number of times, a duration of operating the outdoor unit defrosting mode last time of the air conditioning unit is obtained; if the duration of operating the outdoor unit defrosting mode last time of the air conditioning unit is smaller than a first preset duration or larger than a second preset duration, preset defrosting interval time and / or a preset defrosting coil pipe temperature used during last defrosting determination are / is corrected; and according to the corrected preset defrosting coil pipe temperature and / or the preset defrosting interval time, the opportunity for the air conditioning unit to enter the outdoor unit defrosting mode this time is determined, so that the optimal opportunity for the air conditioning unit to enter the outdoor unit defrosting mode can be effectively determined.

Description

technical field [0001] The invention belongs to the technical field of air conditioning, and in particular relates to a defrosting control method for an air conditioning unit. Background technique [0002] When the air conditioner unit is operating in the heating condition in a low temperature environment, the outdoor heat exchanger is prone to frosting. When the frosting is serious, it will affect the heat exchange between the outdoor heat exchanger and the outdoor environment, resulting in the heating effect At this time, it is necessary to defrost in time. Many existing defrosting control methods are judged by the difference between the coil temperature of the outdoor heat exchanger and the outdoor ambient temperature. For example, when the difference exceeds a certain threshold and the interval between two defrosting exceeds the preset time to defrost. Of course, in some cases, other judgment conditions may also be added to judge the timing of defrosting; however, when...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the above-mentioned problems in the prior art, that is, to solve the problem that misjudgments easily occur when the existing air-conditioning units use fixed preset coil temperature and defrosting interval time for judgment, the present invention provides an air-conditioning unit A defrosting control method, the defrosting control method includes: in the case that the number of times the air conditioning unit runs the outdoor unit defrosting mode exceeds a preset number of times after the air conditioning unit is started this time, obtaining the defrosting mode of the outdoor unit that the air conditioning unit last operated The duration of the defrosting mode; if the last time the air conditioner unit operates the outdoor unit defrosting mode is less than the first preset duration or greater than the second preset duration, the preset defrosting interval used for the last defrosting judgment Time and / or preset defrosting coil temperature are corrected; according to the corrected preset defrosting coil temperature and / or preset defrosting interval time, it is judged when the air conditioner unit enters the outdoor unit defrosting mode this time ; Wherein, the first preset duration is less than the second preset duration

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