Defrosting control method for heat pump unit and air conditioner heat pump unit adopting defrosting control method

Abstract

The invention relates to a defrosting control method for a heat pump unit and the air conditioner heat pump unit adopting the defrosting control method. The situations such as inaccurate judgment of the frosting condition, conduction of defrosting operation under the frostless condition and incomplete defrosting are avoided, the comfort level of an air conditioner is improved, and energy is saved. The real-time temperature of an external coil pipe is monitored, the thickness of a frost layer is judged according to change conditions of the temperature of the external coil pipe and the duration, defrosting is performed when the frost layer has the certain thickness, and defrosting conditions can be adjusted in real time according to temperature and humidity change after running of the unit, so that the unit is adapted to different actual environments.

Description

technical field [0001] The invention belongs to the technical field of air-conditioning defrosting, and in particular relates to a defrosting control method of a heat pump unit and an air-conditioning heat pump unit using the defrosting control method. Background technique [0002] When the ordinary heat pump air conditioner is in heating operation, frost will form when the temperature of the outdoor heat exchanger is lower than the freezing temperature of water. The frost layer increases the thermal resistance and reduces the total heat transfer coefficient of the heat exchanger. When the frost is thicker, the heat transfer effect of the condenser will deteriorate, which will weaken the heating effect of the system. At this time, defrosting treatment is required. [0003] At present, the defrosting methods of air conditioners are generally as follows: 1. Timed defrosting; 2. Judging and calculating according to the ambient temperature and condenser temperature to determine ...

AI Technical Summary

Problems solved by technology

[0004] Timed defrosting consumes a lot of energy, and the latter two methods have inaccurate data, or the simulation of the working conditions is incomplete and there are differences between the actual conditions, the stored data does not match the actual operating environment of the unit, and self-correction and adjustment cannot be performed according to the actual situation. Inaccurate judgment of frost formation leads to frost-free defrosting or frost-free defrosting, which reduces the comfort of the air conditioner and also causes energy waste

Therefore, the existing common defrosting methods cannot specifically and accurately detect whether the air conditioner is frosted and perform defrosting operations in a timely and effective manner. The defrosting effect is not ideal.

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