Method and control system for detecting defrosting of air source heat pump based on infrared thermal imaging

Abstract

The invention discloses a method and control system for detecting defrosting of an air source heat pump based on infrared thermal imaging. The system comprises a compressor, a gas and liquid separator, a four-way reversing valve, an indoor heat exchanger, an electronic expanding valve, an outdoor heat exchanger, an infrared thermal imaging instrument, a digital processor, a memorizer, a video outputting device, a temperature and humidity recorder and other parts, wherein the infrared thermal imaging instrument, the digital processor and the memorizer are relevant to defrosting control. According to the system, by means of a reverse cycle work condition and control logistics, defrosting of the system is achieved; and by means of the system and the method, the mistaken defrosting condition can be effectively avoided, the defrosting energy consumption is reduced, and the beneficial effects of energy conservation and environmental protection are achieved. The infrared thermal imaging instrument is dual-purpose, can output surface temperature and surface condition common videos, can control the defrosting work condition in winter, and can detect the blockage condition of an outdoor unitin summer. By means of the system, not only can the defrosting condition be controlled, the outdoor unit condition videos can also be uploaded and output, and a worker can perform overhauling conveniently.

Description

technical field [0001] The invention relates to the field of defrosting control of air source heat pumps, in particular to a method for detecting frosting of air source heat pumps based on infrared thermal imaging technology and a corresponding defrosting control method. Background technique [0002] The air source heat pump unit is a heat pump device that is widely used in building HVAC installations at this stage. Air source heat pumps are widely used in winter heating because of their easy installation, energy saving and emission reduction. During winter operation, the biggest problem encountered is the frosting problem on the surface of the outdoor heat exchanger. As the thickness of the frost layer increases, the thermal resistance between the heat exchanger and the air increases; The heat exchange condition of the air source heat pump unit deteriorates, which greatly affects the operation of the unit. In severe cases, the compressor will stop and cannot work normally....

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Problems solved by technology

[0012] In order to solve the problems existing in the prior art, the present invention provides a defrosting method and control system for air source heat pumps based on infrared thermal imaging detection, which solves the problem of high energy consumption in the operation of defrosting units in the prior art

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