The use of TiO₂ nanoparticles to reduce refrigerator ir-reversibility

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• 作者：Venkataramana Murthy V. Padmanabhan^a ; ^{vpvrmurthy@gmail.com} ; Senthilkumar Palanisamy^b ; ¹ ; ^{cryosenthil@yahoo.com}
• 关键词：Nanoparticles ; Hydrocarbons mixture ; Vapour-compression refrigeration system ; Coefficient of performance ; Ir-reversibility ; Exergy efficiency
• 刊名：Energy Conversion and Management
• 出版年：2012
• 期刊代码：13_01968904
• 类别：pw
• 出版时间：July, 2012
• 卷：59
• 期：Complete
• 页码：122-132
• 文件大小：1333 K

摘要

The ir-reversibility at the process of a vapour-compression refrigeration system (VCRS) with nanoparticles in the working fluid was investigated experimentally. Mineral oil (MO) with 0.1 g L^鈭? TiO₂ nanoparticles mixture were used as the lubricant instead of Polyol-ester (POE) oil in the R134a, R436A (R290/R600a-56/44-wt.%) and R436B (R290/R600a-52/48-wt.%)VCRSs. The VCRS ir-reversibility at the process with the nanoparticles was investigated using second law of thermodynamics. The results indicate that R134a, R436A and R436B and MO with TiO₂ nanoparticles work normally and safely in the VCRS. The VCRSs total ir-reversibility (529, 588 and 570 W) at different process was better than the R134a, R436A and R436B and POE oil system (777, 697 and 683 W). The same tests with Al₂O₃ nanoparticles showed that the different nanoparticles properties have little effect on the VCRS ir-reversibility. Thus, TiO₂ nanoparticles can be used in VCRS with reciprocating compressor to considerably reduce ir-reversibility at the process.