Investigation Of Exergy Analysis In Vapour Compression Refrigeration System

William Granetin, Thomas (2015) Investigation Of Exergy Analysis In Vapour Compression Refrigeration System. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

The “ Exergy Analysis in Vapour Compression Refrigeration System ” project. This project’s focus is to investigate on the exergy analysis in vapour compression refrigeration system. Exergy analysis is a thermodynamics method which enables the evaluation and improvement for the refrigeration system in term of performance and efficiency based on the second law of thermodynamics. The main purpose of this final year project is to investigate the exergy loss for each component and to evaluate the heat transfer performance of the vapour compression refrigeration system. For this project, the scopes are to evaluate all the parts in the refrigeration system including evaporator, condenser, compressor and expansion valve, to check the temperature and pressure for each parts using thermometer sensor and pressure gauges, to analyze the collected data in estimating the amount of exergy loss for each components and assessing the second law efficiency through formulated calculation. Using experimental method, a refrigeration system ET412C with vapour compression cycle is used to gain and collect for this project’s analysis. The QH and WIn value increases with the increasing ambient temperature while the QL maintains its value steadily. The COPR is directly proportional with the second law efficiency but inversely proportional with the increasing ambient temperature. Exergy loss for compressor shows a significant increase, expansion valve remains constant, slight decrease and gradually increase in evaporator and gradually decreases in condenser with the increasing of ambient temperature. At 33 degree Celcius, compressor shows the highest exergy loss around 5 W while condenser is lowest at 0.2 W. The result shows the overall exergy loss for the refrigeration system is directly proportional to the increasing ambient temperature. As for this project’s conclusion, COP and second law of efficiency are dependent towards the value of exergy loss. Therefore, evaluation of heat transfer performance through exergy analysis is proven effective as the objectives are achieved for this final stage project.

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