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ISSN Print: 2472-9477 ISSN Online: 2472-9493

International Journal of Energy Policy and Management

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Experimental Evaluation on Exergy Analysis of Vapour Compression Refrigeration System Using LPG with TiO₂-Nanoparticle

International Journal of Energy Policy and Management
Vol.2 , No. 1, Publication Date: Aug. 8, 2017, Page: 1-8

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Authors

[1]	Luke Onyekwere Ajuka, Mechanical Engineering Department, University of Ibadan, Ibadan, Nigeria.
[2]	Kamilu Moradeyo Odunfa, Mechanical Engineering Department, University of Ibadan, Ibadan, Nigeria.

Abstract

A domestic refrigerator designed to work with R-134a was used as a test unit to assess the possibility of using LPG (R290/R600a: 50% 50%), an environmental-friendly refrigerant with TiO₂ nano-lubricant. The performance of the refrigerator using various concentrations of 15nm particle size of TiO₂ nano-lubricant at 0.1, 0.2 and 0.4wt% with LPG were investigated and compared with the performance of the refrigerator when R-134a was used as refrigerant. The evaporator temperature effects on energy consumption, coefficient of performance, exergetic efficiency and exergetic defects in the compressor, condenser, capillary tube and evaporator of the refrigeration system were examined. The results show that for LPG + TiO₂ (0.4wt%), LPG + TiO₂ (0.2wt%), LPG + TiO₂ (0.1wt%), and LPG (Pure) respectively, the COP is 15.4, 22.7, 12.4, and 9.38% higher than HFC-134a, the compressor consumed 29.9, 34.6, 23.6 and 18.3% less energy for LPG + TiO₂ (0.4wt%), LPG + TiO₂ (0.2wt%), LPG + TiO₂ (0.1wt%), and LPG (Pure) respectively less energy than that of HFC-134a, and the exergetic efficiencies were LPG + TiO₂ (0.4wt%), LPG + TiO₂ (0.2wt%), LPG + TiO₂ (0.1wt%), and LPG (Pure) respectively 7.8, 8.6, 6.5, and 6.0% higher that of HFC-134a at 29°C ambient temperature. The COP, energy consumption, exergy efficiency and other result obtained in this experiment shows that LPG mixed with TiO₂ nanoparticle particularly at 0.2 wt.% concentration can be used as refrigerant in the domestic refrigerator.

Keywords

Environmental-Friendly Refrigerant, Energy Consumption, LPG, COP, Exergetic Efficiency, Exergetic Defects

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