A pre-type anti-frost and defrosting method

Abstract

The invention discloses a front-type frost prevention and defrosting method. The purpose of the present invention is to provide a front-type defrosting method. The present invention is characterized in the following steps: A. predict frosting amount, set up the sample training database of frosting amount prediction network; B. preprocessing of sample training database, training the samples of database, including normalization, initial value setting Determine and calculate the error; C. Establish a forecasting network for the amount of frosting, select a network training algorithm with the smallest error, set the learning rate to automatically learn from 0-1, obtain the best learning rate, and establish a network for predicting the amount of frosting ; D. Test the frosting amount prediction network, given the environmental variables and evaporator structure parameters, calculate the amount of frosting, and compare with the real value; E. Adjust the amount of supplementary heat, according to the frosting amount prediction obtained in steps A-D value, adjust the supplementary heat of the heat pump evaporator, so as to achieve effective frost prevention and defrosting. The invention is mainly used for preventing and defrosting the surface of the evaporator of the heat pump system.

Description

technical field [0001] The invention relates to a method for preventing and defrosting, in particular to a front-type method for preventing and defrosting. Background technique [0002] Heat pump air conditioning systems are widely used in the air conditioning industry. However, in winter, as the outdoor ambient temperature decreases, frost crystals will condense on the surface of the evaporator of the air conditioning system. Most evaporators are composed of multiple rows of working medium tubes, and uneven heat transfer is prone to uneven frosting. The traditional defrosting methods include reverse defrosting and hot gas bypass defrosting. When the external conditions are bad, it is difficult for the system to absorb heat from the environment, making these two methods difficult to realize. However, electric auxiliary heat defrosting can give the system energy from the outside to make it run, but there is no reliable amount of frosting to quantify the amount of auxiliary ...

AI Technical Summary

Problems solved by technology

However, in winter, as the outdoor ambient temperature decreases, frost crystals will condense on the surface of the evaporator of the air conditioning system. Most evaporators are composed of multiple rows of working medium tubes, and uneven heat transfer is prone to uneven frosting

The traditional defrosting methods include reverse defrosting and hot gas bypass defrosting. When the external conditions are bad, it is difficult for the system to absorb heat from the environment, making it difficult to realize these two methods

However, electric auxiliary heat defrosting can give the system energy from the outside to make it run, but there is no reliable amount of frosting to quantify the amount of auxiliary heat added. At present, most devices use too large or even several times The supplementary heating of the electric auxiliary heat will not only fail to improve the defrosting of the evaporator according to local conditions, but also cause a lot of energy waste, and the existing defrosting method will lead to a significant decrease in the output heat of the heat pump during the defrosting process, affecting Effect

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