Fault Detection in Compression Refrigeration System with a Fixed Orifice and Rotary Compressor

Document Type : Research Article

Authors

1 Young Researchers and Elite Club, Khomeinishahr Branch, Islamic Azad University, KhomeiniShahr, Isfahan, Iran

2 Islamic Azad University Khomeinishahr Branch, isfahan, iran

Abstract

In compression refrigeration systems such as air conditioning, chiller, split unit, which the refrigerant gas compression is used for cooling, the operation of the device is always dependent   on parameters such as pressure, the temperature of different points, and consumed ampere. A tangible change in each of these items represents the existence of a potential fault in the cycle. The basic problem often arises from the fact that there is a time gap between the occurrence of fault and detection of it by the operator, causing damage to the device irreparably and the coefficient of performance is affected. Simulation has been performed by changing the refrigerant gas charge from 40% to 150%, causing condenser and evaporator clogging up to 30% and 60%, and also creating leakage in the compressor and fault detection and diagnosis is done with these parameters. In this paper, it is shown that a slight change in any of these parameters causes a change in the operation of the refrigeration cycle. In this study, Fault detection it was shown that the superheat value in refrigerant overcharge fault increasing to 16.5°C  and in dirty condenser fault decreasing to 2.1°C and reduced evaporator air flow fault decreasing to 1.7°C. Also sub-cooling value in refrigerant undercharge, dirty condenser, reduced evaporator air flow, compressor failure fault decreasing to 4.2°C, 12.6°C, 12.8°C, 10°C.

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References

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AUT Journal of Mechanical Engineering
Volume 4, Issue 2
June 2020
Pages 277-286

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