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<p>Nanofluids have demonstrated significant potential to improve the efficiency of heat transfer systems, particularly in refrigeration applications. This study experimentally investigates the effects of Fe<sub>3</sub>O<sub>4</sub> nanoparticles (0.15% mass fraction) dispersed in POE RL32-3MAF compressor oil on the performance of a 5-ton R22 vapor compression chiller, alongside the impact of outdoor temperature variations (33–39&#xa0;°C). System parameters were monitored at four critical points in the refrigeration cycle (evaporator outlet, compressor outlet, condenser outlet, and expansion valve outlet) under both nanofluid-enhanced and base oil conditions. Key findings reveal that the nanolubricant enhances cooling capacity by 5% and improves the coefficient of performance (COP) by 2% on average, despite a marginal 3% increase in compressor power consumption. Outdoor temperature exhibited a pronounced influence, with each 2&#xa0;°C rise reducing COP by approximately 10%. Furthermore, the compressor’s electrical input power consistently exceeded its thermodynamic power by 10%, with the discrepancy intensifying at higher ambient temperatures. These results highlight the dual role of nanolubricants in boosting system efficiency while mitigating performance degradation under thermal load variations.</p>

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Experimental investigation of Fe3O4 nano-oil and outdoor temperature effects on a 5-ton R22 vapor compression chiller performance

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月1日

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  • Mahdi Mohseni,
  • Amir Hossein Fathollahi

摘要

Nanofluids have demonstrated significant potential to improve the efficiency of heat transfer systems, particularly in refrigeration applications. This study experimentally investigates the effects of Fe3O4 nanoparticles (0.15% mass fraction) dispersed in POE RL32-3MAF compressor oil on the performance of a 5-ton R22 vapor compression chiller, alongside the impact of outdoor temperature variations (33–39 °C). System parameters were monitored at four critical points in the refrigeration cycle (evaporator outlet, compressor outlet, condenser outlet, and expansion valve outlet) under both nanofluid-enhanced and base oil conditions. Key findings reveal that the nanolubricant enhances cooling capacity by 5% and improves the coefficient of performance (COP) by 2% on average, despite a marginal 3% increase in compressor power consumption. Outdoor temperature exhibited a pronounced influence, with each 2 °C rise reducing COP by approximately 10%. Furthermore, the compressor’s electrical input power consistently exceeded its thermodynamic power by 10%, with the discrepancy intensifying at higher ambient temperatures. These results highlight the dual role of nanolubricants in boosting system efficiency while mitigating performance degradation under thermal load variations.