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

10.22060/ajme.2019.16081.5802

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. This fault can impose severe damage to the cycle in the short or long term, or in many cases, reduce the refrigeration cycle efficiency and increase energy consumption. 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. Five temperature and pressure sensors are developed to obtain the five most important temperature and pressure in vapor compression cycle equipment: compressor discharge line temperature, condensing pressure, liquid line temperature, evaporating pressure, and suction line temperature. 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 (FDD) 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.

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