<abstract xmlns="http://www.w3.org/1999/xhtml">

Nano-enhanced refrigerants are substances in which the nanoparticles are suspended in the refrigerant at the desired concentration. They have the potential to improve the performance of refrigeration and air-conditioning systems that use vapour compression. This study focuses on the thermal conductivity of alumina (Al2O3) and cupric oxide (CuO) nanoparticles immersed in 2,3,3,3-tetrafluoropropene (R1234yf). The thermal conductivity of nano-refrigerants was investigated using appropriate models from earlier studies where the volume concentration of particles and temperatures were varied from 1% to 5% and from 273 K to 323K, respectively. The acquired results are supported by prior experimental investigations on R134a-based nano-refrigerants undertaken by the researchers. The main investigation results indicate that the thermal conductivity of Al2O3/R1234yf and CuO/R1234yf is enhanced with the particle concentrations, interfacial layer thickness, and temperature. Also, the thermal conductivity of Al2O3/R1234yf and CuO/R1234yf decreases with particle size. The thermal conductivity of Al2O3/R1234yf and CuO/R1234yf nano-refrigerants become enhanced with a volume concentration of nano-sized particles by 41.2% and 148.1% respectively at 5% volume concentration and 323K temperature. The thermal conductivity of Al2O3/R1234yf reduces with temperature, by upto 3% of nanoparticle addition and after that, it enhances. Meanwhile, it declines with temperature, by upto 1% of CuO nanoparticle inclusion for CuO/R1234yf. CuO/R1234yf has a thermal conductivity of 16.69% greater than Al2O3/R1234yf at a 5% volume concentration. This paper also concludes that, among the models for thermal conductivity study, Stiprasert’s model is the most accurate and advanced.
</abstract>

Nano-enhanced refrigerants are substances in which the nanoparticles are suspended in the refrigerant at the desired concentration. They have the potential to improve the performance of refrigeration and air-conditioning systems that use vapour compression. This study focuses on the thermal conductivity of alumina (Al2O3) and cupric oxide (CuO) nanoparticles immersed in 2,3,3,3-tetrafluoropropene (R1234yf). The thermal conductivity of nano-refrigerants was investigated using appropriate models from earlier studies where the volume concentration of particles and temperatures were varied from 1% to 5% and from 273 K to 323K, respectively. The acquired results are supported by prior experimental investigations on R134a-based nano-refrigerants undertaken by the researchers. The main investigation results indicate that the thermal conductivity of Al2O3/R1234yf and CuO/R1234yf is enhanced with the particle concentrations, interfacial layer thickness, and temperature. Also, the thermal conductivity of Al2O3/R1234yf and CuO/R1234yf decreases with particle size. The thermal conductivity of Al2O3/R1234yf and CuO/R1234yf nano-refrigerants become enhanced with a volume concentration of nano-sized particles by 41.2% and 148.1% respectively at 5% volume concentration and 323K temperature. The thermal conductivity of Al2O3/R1234yf reduces with temperature, by upto 3% of nanoparticle addition and after that, it enhances. Meanwhile, it declines with temperature, by upto 1% of CuO nanoparticle inclusion for CuO/R1234yf. CuO/R1234yf has a thermal conductivity of 16.69% greater than Al2O3/R1234yf at a 5% volume concentration. This paper also concludes that, among the models for thermal conductivity study, Stiprasert’s model is the most accurate and advanced.

Predictive Analysis on the Influence of Al2O3 and CuO Nanoparticles on the Thermal Conductivity of R1234yf-Based Refrigerants

Department of Thermal and Energy Engineering, School of Mechanical Engineering

Department of Automatic Control and Robotics, Faculty of Electrical Engineering

Acta Mechanica et Automatica

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Predictive Analysis on the Influence of AlO and CuO Nanoparticles on the Thermal Conductivity of R1234yf-Based Refrigerants

Nano-enhanced refrigerants are substances in which the nanoparticles are suspended in the refrigerant at the desired concentration. They have the potential to...

Predictive Analysis on the Influence of Al₂O₃ and CuO Nanoparticles on the Thermal Conductivity of R1234yf-Based Refrigerants

Online veröffentlicht: 25. Juli 2024

Seitenbereich: 474 - 482

Eingereicht: 28. Juni 2023

Akzeptiert: 30. Dez. 2023

DOI: https://doi.org/10.2478/ama-2024-0050

Schlüsselwörter
heat transfer fluid, nanoparticles, nano-refrigerants, thermal conductivity models, thermo-physical properties, nanofluids, temperature, volume concentration

© 2024 Baiju S. Bibin et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Predictive Analysis on the Influence of Al2O3 and CuO Nanoparticles on the Thermal Conductivity of R1234yf-Based Refrigerants

Online veröffentlicht: 25. Juli 2024

Seitenbereich: 474 - 482

Eingereicht: 28. Juni 2023

Akzeptiert: 30. Dez. 2023

DOI: https://doi.org/10.2478/ama-2024-0050

Schlüsselwörterheat transfer fluid, nanoparticles, nano-refrigerants, thermal conductivity models, thermo-physical properties, nanofluids, temperature, volume concentration

© 2024 Baiju S. Bibin et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Predictive Analysis on the Influence of Al₂O₃ and CuO Nanoparticles on the Thermal Conductivity of R1234yf-Based Refrigerants

Schlüsselwörter
heat transfer fluid, nanoparticles, nano-refrigerants, thermal conductivity models, thermo-physical properties, nanofluids, temperature, volume concentration