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A method for intelligent defrosting of refrigeration system based on electronic expansion valve opening

A technology of electronic expansion valve and refrigeration system, which is applied in the direction of refrigerators, refrigeration components, refrigeration and liquefaction, etc., can solve the problems of large amount of frost in the evaporator, decrease in refrigeration efficiency, and affect the refrigeration effect, etc., and achieve broad market prospects and social economy. Value, rapid response, and the effect of improving overall operating efficiency

Inactive Publication Date: 2021-03-19
NANKAI UNIV
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Problems solved by technology

At present, the defrosting of the refrigeration system mostly adopts the method of timing defrosting, and the defrosting control is carried out according to a fixed time interval. If the frost is not timely, the amount of frost in the evaporator will be too large, and the cooling efficiency of the system will decrease.

Method used

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  • A method for intelligent defrosting of refrigeration system based on electronic expansion valve opening
  • A method for intelligent defrosting of refrigeration system based on electronic expansion valve opening

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specific Embodiment approach

[0020]Seefigure 1 A method of intelligent defrosting based on electronic expansion valve opening degree, judges the evaporator frost by the end of the refrigeration cycle, and the intelligent set defrost control is achieved. This intelligence method includes the following control steps:

[0021]1) After the system is turned on, enter the standby mode, waiting for the library temperature to reach a predetermined high temperature power-up temperature; after the library temperature reaches the high temperature power-on temperature, the system enters the refrigeration state, first enter the refrigeration preparation state, determine the shortest stop time of the compressor, It is determined that the high and low pressure pressure is poor, the electronic expansion valve is adjusted to the preset opening degree;

[0022]2) When the cooling condition is satisfied, the evaporative fan, condensed fan, then open the compressor, enter the normal refrigeration state; during the refrigeration process,...

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Abstract

The invention relates to a method for intelligent defrosting of a refrigeration system based on the opening degree of an electronic expansion valve. The method uses a fuzzy PID algorithm combined with an electronic expansion valve to control the superheat parameter of the refrigeration system, and on this basis, utilizes the strong reliability of the entire refrigeration system. With the characteristics of repeatability and time lag, modern intelligent technologies such as Internet of Things technology and fuzzy control are comprehensively used, and the end opening of the last refrigeration cycle of the electronic expansion valve and the reference opening of the electronic expansion valve are used as parameters, combined with intelligent algorithms, to judge the cooling effect. The frosting condition of the system evaporator, and enter the defrosting process of the refrigeration system as needed, and complete the defrosting of the refrigeration system on demand. The application of this technology realizes the intelligent prediction and discrimination of the amount of frost in the evaporator, provides a reliable basis for realizing the on-demand defrosting of the refrigeration system, improves the overall operating efficiency of the refrigeration system, and achieves the purpose of effectively saving energy and reducing consumption.

Description

Technical field[0001]The present invention relates to refrigeration techniques, intelligent control techniques, and more particularly to a method of smart defrosting based on electronic expansion valve opening degree.Background technique[0002]Defrost control has always been the technical difficulty of refrigeration systems, especially commercial frozen refrigeration systems, and the quality of defrosting effects directly affects the operating stability and operational efficiency of the entire refrigeration system. How to determine the amount of frost of the evaporator, thereby achieving the desired intelligent defrost, which has become a core problem of defrosting control. Now the refrigeration system of the refrigeration system uses the fixed time defrosting, in accordance with fixed intervals, it is difficult to adapt to complex conditions of changing articles in the cold storage, it is easy to cause excessive defrosting to affect cooling effects, or divide The frost does not caus...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F25B49/02F25B41/31F25B47/02F25D17/04
CPCF25B49/02F25B47/02F25D17/04F25B41/31Y02B30/70
Inventor 程如岐陈绍慧鲁晓翔张颖高艺孙学良
Owner NANKAI UNIV
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