Design and Fabrication of a Liquid Floodback Protection System in Positive Displacement Compressors of Air Conditioners Systems

Document Type : Research Paper

Authors

1 Department of Engineering, Islamic Azad University, Chalous Branch, Iran

2 Electronics Department, Islamic Azad Unviersity, E-branch, Tehran, Iran

3 Department of Aeronautical Science, Iran Space Research Center, Ministry of Science, Research and Technology, Tehran, Iran

Abstract

Positive displacement compressors are one of the most important and expensive components of the vapor compression refrigeration cycle, it is very important to protect this equipment during operation and against destructive phenomena. The compressive mechanism of this type of compressors is based on the compressibility of gases and the pressure increases by reducing the volume and compressing the refrigerant gas. One of the destructive phenomena that causes main failure and mechanical damage to this type of compressors is the liquid flood back that occurs when liquid refrigerant returns to the compressors suction line. This research focuses on design, fabricate and test a protecting system to protect the compressor against liquid flood back. This protecting system is based on electronic processing of effective parameters including operating pressure, operating temperature, superheat temperature, superheat degree and type of refrigerant. The protection system processes based on the relevant thermodynamic formulas and issues the appropriate command based on the processing result. Validated researches prove electronic processing method is better than mechanical processing. The protection system installed successfully on a 30 ton Positive displacement compressor with R-22 refrigerant.
 

Keywords

References

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Journal of Petroleum Research
Volume 31, 1400-6 - Serial Number 121
March and April 2022
Pages 71-88

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