Effect on Energy Efficiency and Emissions of Duplex Circuit Air-Cooled Centralized Air-Conditioning System using HFC134a/SiO2 Nano-Fluid

Year 2026, Volume: 10 Issue: 1, 155 - 163, 16.12.2025

Dr. Shıvakumar Nagareddy , Ravi Subramanyam , Vijay Govindarasu

https://doi.org/10.31127/tuje.1676459

Abstract

To reduce the emissions from an air-conditioning system, the air-cooled chiller unit is equipped with duplex compressors-condensers parallel circuit where it used SiO2/HFC134a nano-refrigerant. Also to minimize the power consumption of centralized air-conditioning system, only the required space (inside rooms excluding the corridor areas) was installed with evaporator unit, and the in/out pipe lines were effectively insulated. The experimental scientific data were noted for base refrigerant HFC134a and also for SiO2/HFC134a nano-refrigerant at two dissimilar concentrations of 0.20% and 0.30% SiO2 . From the evaluated results, it was concluded that the cooling capacity and COP (coefficient of performance) of the nano-refrigerant with 0.20% and 0.30% SiO2 concentrations are increased by 4.68% and 2.54%; and 17.39% and 13% respectively when compare with base refrigerant HFC134a. The annual power consumption (and/or) annual CO2 emissions of nano-refrigerant with 0.20% and 0.30% SiO2 concentrations of are decreased by the same amounts of 10.83% and 9.29% respectively when compare with base refrigerant HFC134a. The SiO2/HFC134a nano-refrigerant with 0.20% of SiO2 concentration shown better results in terms of cooling capacity, COP, energy consumption and CO2 emissions.

Keywords

Nano-refrigerant , SiO2/HFC134a , Air-Conditioning , Nano-FLuid , Cooling Capacity

Ethical Statement

Authors were declare that the submitted research article is original one and is not submitted to any other journal or elsewhere.

Supporting Institution

Chennai Institute of Technology, Chennai, India.

Project Number

nil

Thanks

Authors thank the management of the supporting institute for providing the facility inside the campus to conduct this research work.

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