Computer simulation performance computation method of refrigeration system under frosting working condition

Abstract

The invention discloses a computer simulation performance computation method of a refrigeration system under a frosting working condition. The computer simulation performance computation method comprises the following steps of respectively establishing a wet air physical property computing module, a coolant physical property computing module, a condenser structure computing module, an evaporator structure computing module and an evaporator frosting computing module; and establishing a refrigeration circulation system computing module. On the basis of simulating the variation of a frost layer of an evaporator, the variation of the whole refrigeration circulation operation situation is caused due to the variation of evaporation temperature. Through the computer simulation performance computation method disclosed by the invention, design can effectively avoid the system abnormal work risk due to frosting; simultaneously, effective geographic data is effectively provided for defrosting control of a refrigeration system, and the refrigerating output and the energy efficiency ratio of the refrigeration system are more effectively improved. Computing time is subjected to uniform step length partition firstly, and complex iteration computation is carried out on the structure and heat exchange parameter in a program by utilizing computer accessory appliances. The method in the invention realizes the dynamic simulation of a whole system under the frosting working condition.

Description

technical field [0001] The invention relates to a computer-aided design technology in refrigeration and low-temperature technology, in particular to a computer simulation performance calculation method of a refrigeration system under frosting conditions. Background technique [0002] Simulation and simulation of refrigeration equipment using computer-aided technology has become the main means of developing various refrigeration products. With the vigorous development of computer technology, the computing power of computer has also been significantly improved. More and more enterprises have put their attention into simulation and simulation, and at the same time, they have also used computer-aided technology to make design and development work reach an unprecedented height. [0003] Frosting phenomenon generally exists in refrigeration, low temperature, air conditioning, aerospace, chemical machinery and other fields. When moist air flows over a surface that is cooler than i...

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Problems solved by technology

[0007] One field is the evaporative heat transfer under dry conditions. Wu Yezheng's "Guidelines for the Design of Small Refrigeration Devices" (first edition, Beijing: Machinery Industry Press, 1998) introduced a refrigeration cycle simulation calculation method, but this The disadvantage of this method is that it does not deal with the inevitable frosting problem in low temperature environment

However, this method separates the evaporator from the refrigeration system and does not consider the impact of the evaporator on the entire refrigeration system due to frosting. It cannot truly and effectively reflect the operation status of each equipment in actual work, and cannot meet the requirements of the designer.

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