Capacitance method intelligent defrosting device and control method

Abstract

The invention discloses a capacitance method intelligent defrosting device and a control method. Based on a refrigerating system, a defrosting device and a control system, a parallel plate capacitor,an insulating material, a finned tube evaporator, an intermediate relay, an intelligent capacitance instrument, an electric heater, a programmable logic controller (PLC) and other parts coordinate with each other to complete operation. The capacitance method intelligent defrosting device can accurately define a defrosting starting and stopping control point through a capacitance value of the parallel plate capacitor under a complicated and changeable frosting environment, the defects that defrosting is insufficient, and due to ineffective defrosting, the system is high in energy consumption, large in room temperature and humidity fluctuation and the like are avoided, the energy saving effect is remarkable, and the safety is high. In addition, a power changing electric heater can achieve intelligent heat quantity changing defrosting of different positions of the evaporator according to the difference of capacitance values of various parallel plates, so that the defrosting efficiency isimproved, and the energy saving purpose is achieved.

Description

technical field [0001] The invention relates to the fields of low-temperature refrigeration, refrigeration and heating, ventilating and air-conditioning, and more specifically, relates to a capacitance-based intelligent defrosting device and a control method. Background technique [0002] The evaporator is one of the necessary equipment in the refrigeration system, and its excellent heat transfer performance is related to the operating efficiency of the entire system. The evaporator of the air-conditioning system or the low-temperature refrigeration system operating at low temperature in winter is very prone to frosting, especially in the high-humidity food freezing and refrigeration environment, the frosting of the evaporator is more serious, and the formation of the frost layer increases the heat transfer. The heat transfer performance of the evaporator is significantly reduced due to thermal resistance. Therefore, achieving a frost-free environment for the evaporator or e...

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Problems solved by technology

For example, the photoelectric control method, although it can accurately test the thickness of the frost layer through the laser, but due to the randomness of the frosting, there are many test points and the investment cost is high.

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