Defrosting control system and method for air source heat pump

Abstract

The invention discloses a defrosting control system and method for an air source heat pump. According to the defrosting control system, based on an original system structure for the air source heat pump, a temperature sensor and cameras for camera-shooting the frosting condition of the surface of an outdoor side heat exchanger are arranged on the outer portion of the outdoor side heat exchanger, the surface of the outdoor side exchanger is coated with underlying color significantly different from frost color, the temperature of accessories of the outdoor heat exchanger is detected by the temperature sensor, the system defrosting function is enabled when the set temperature is reached, meanwhile the cameras are activated and opened automatically, and the frosting condition of the surface of the outdoor heat exchanger can be monitored in real time.

Description

technical field [0001] The invention relates to a defrosting control system and method for an air source heat pump. Specifically, a machine learning algorithm and an image processing technology are used to control the defrosting to improve the defrosting efficiency. Background technique [0002] Frosting is a key issue affecting the operating efficiency of air source heat pump units. When the ambient temperature is low and the fin temperature of the outdoor heat exchanger is lower than zero, the moisture in the air will directly turn into a frost layer and adhere to the surface of the evaporator. The frost layer will change from thin to thick, gradually blocking the air passage, and rapidly increasing the thermal resistance. The increase in thermal resistance leads to a decrease in evaporation temperature and a decrease in heat absorption. As long as the evaporation temperature of the air source heat pump is lower than 0°C, a frost layer will appear on the surface of the e...

AI Technical Summary

Problems solved by technology

Existing defrosting control methods include: 1) timing defrosting method; 2) heat exchanger surface temperature-time defrosting control method; 3) pressure-temperature defrosting control method; 4) heat exchanger surface and air temperature difference Frost control method; the above defrost control method measures variables that affect the frosting process, such as temperature, pressure, time, etc. Although it can be used as a basis to control the start of defrosting, it cannot be judged when the defrosting ends. Because the length of the defrosting time, when to stop the defrosting cycle depends on the thickness and density of the frost layer (that is, the quality of the frost layer), and also depends on the ambient temperature, humidity and other parameters, and there are too many influencing factors

The above defrosting control methods have not overcome the disadvantage of poor adaptability of defrosting control to unit working conditions, and unnecessary defrosting will still occur

In this way, the operating efficiency of the unit is reduced, and energy is greatly wasted

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