Exergetic Investigation of a R1234yf Automotive Air Conditioning System with Internal Heat Exchanger

Year 2018, Volume: 21 Issue: 2, 103 - 109, 30.05.2018

Mehmet Direk , Mehmet Selçuk Mert , Fikret Yüksel , Alper Keleşoğlu

https://doi.org/10.5541/ijot.357232

Cited By: 13

Abstract

This study presents the exergetic
investigation of an automotive air conditioning (AAC) system with the
refrigerant R1234yf experimentally. The air-conditioning system is based on the
conventional mechanical compression refrigeration cycle. An internal heat
exchanger (IHX) has been added to the system in order to provide performance
enhancement. The influence of the IHX investigated at different compressor
speeds and air stream temperatures. Experimental measurements were collected by
using a data-acquisition system, and the results were obtained by performing
exergetic analysis. The exergy destruction, exergy efficiency and the total
exergy destruction per cooling capacity were calculated. The analysis results
were compared with a baseline system which operates with the refrigerant R134a.
Furthermore, an empirical correlation was proposed for the determination of the
total exergy destruction per cooling capacity for various compressor speeds for
evaluating the system performance without doing further experiments. As a
result, the exergetic efficiency of the system was improved by introducing IHX
to the system. Moreover, it was observed that the temperature rise in the air stream
decreased the exergy efficiency and increased the total exergy destruction per
cooling capacity. 

Keywords

Automobile air conditioning; exergy analysis; internal heat exchanger; R1234yf.

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