Defrosting control method and refrigerating system

Abstract

The invention provides a defrosting control method and a refrigerating system, and relates to the technical field of refrigerating device.The defrosting control method comprises the steps that during the operation period of the refrigerating system, the outdoor dry-bulb temperature and the relative humidity are obtained; judging whether the refrigerating system is in a frosting working condition or not according to the outdoor dry-bulb temperature and the relative humidity; when the refrigerating system is in the frosting working condition, the pressure difference P between an air inlet and an air outlet of the refrigerating system is obtained; and comparing the pressure difference P between the air inlet and the air outlet of the refrigerating system with a set pressure difference value, and executing preset subsequent processing based on a comparison result. The intelligent defrosting system is provided from the temperature condition and the humidity condition of frosting and the direct influence, namely the influence of front and back pressure difference, of frosting on the finned tube heat exchanger, the temperature, the humidity and the front and back pressure difference serve as defrosting judgment parameters, it is guaranteed that a unit defrosts when being frosted and does not defrost when not being frosted, and therefore the comprehensive energy efficiency and the operation reliability of the system are improved.

Description

technical field [0001] The invention relates to the technical field of refrigeration equipment, in particular to a defrosting control method and a refrigeration system. Background technique [0002] When the refrigeration unit is working, the finned tube heat exchanger is an evaporator. When the surface temperature of the evaporator is lower than 0°C, frosting will occur. With the increase of operating time, the thickening of the frost layer leads to the increase of the air resistance between the fins, which makes the heat transfer efficiency of the heat exchanger decrease. Therefore, defrosting treatment must be carried out. [0003] At present, the commonly used defrosting methods are four-way valve heat pump defrosting, hot gas defrosting or electric heating defrosting. These defrosting methods usually use thermocouples or platinum resistance sensors to detect the surface temperature of the finned tubes of the evaporator and the running time of the compressor to contro...

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a defrosting control method and a refrigeration system to solve the problems existing in the prior art that the refrigeration system adopts temperature and time, the temperature difference between the inlet and outlet air and the When the suction pressure is judged as a defrosting parameter, there is a technical problem of misdefrosting or not defrosting

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