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Comparative assessment of the VCR system performance utilizing R600a and R134a, integrated with CuO-MWCNT composite nanoparticles for minimizing environmental impact.

Author(s) : AKHTAR M. J., RAJPUT S. P. S.

Type of article: IJR article

Summary

A promising strategy involves suspending nanoparticles into eco-friendly refrigerants to form nanorefrigerants, which significantly improve thermophysical and heat transfer properties. This study presents a comparative assessment of a vapor compression refrigeration (VCR) system utilizing CuO, MWCNT, and CuO-MWCNT composite nanoparticles dispersed in polyolester (POE) or mineral oil (MO), paired with R134a and R600a refrigerants. Experiments were conducted with varying nanoparticle concentrations (0.1%, 0.3%, 0.5%, and 0.7% wt%) mixed in 200 ml of lubricant and charged with 200 g of R134a and 120 g of R600a. Performance parameters such as pressure ratio, pull-down time, power consumption, and coefficient of performance (COP) were recorded over 115 minutes. Environmental impact was evaluated using Total Equivalent Warming Impact (TEWI), alongside exergy efficiency (EE), total exergy destruction, and economic analysis via plant cost rate. The results reveal superior system performance using CuO-MWCNT/MO/R600a compared to CuO-MWCNT/R134a/ POE. Significant improvements are noted in pressure ratio, compressor work, and pull-down time. The highest COP enhancements were 13.22% (R134a) and 16.04% (R600a), while EE improved by 38.98% and 42.78%, respectively, compared to their pure refrigerant baselines. Additionally, CuO-MWCNT/MO/R600a achieved a TEWI and exergy destruction reduction of 6.58% and 27.66%.

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Details

  • Original title: Comparative assessment of the VCR system performance utilizing R600a and R134a, integrated with CuO-MWCNT composite nanoparticles for minimizing environmental impact.
  • Record ID : 30034352
  • Languages: English
  • Subject: Technology
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 179
  • Publication date: 2025/11
  • DOI: http://dx.doi.org/https://doi.org/10.1016/j.ijrefrig.2025.08.001

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