Research on image recognition frost measurement technology for air-source heat pumps based on light adaptation

The development of image recognition technology provides a new technical way for air-source heat pump heat exchanger frost measurement, but changes in the outdoor lighting environment will affect the accuracy of image recognition frost measurement. The method of compensating light by non-point source is proposed, the reference illuminance surface source is selected, the frost threshold correction coefficient is used to compensate for the lighting environmental impact, and the image recognition frost measurement technology for air-source heat pump based on light adaptation is developed and applied to a practical project. The results show that under the test conditions of different lighting environments, the defrosting timing of the unit is basically the same, the COP attenuation rate is 18%, and the increase in wind pressure difference fluctuates in the range of 5.45 to 5.68 Pa, which solves the interference of outdoor lighting environment changes on image recognition, and provides a feasible technical solution for the application of image recognition frost measurement technology in the defrost control of air-source heat pump.