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

Dr. Shıvakumar Nagareddy; Ravi Subramanyam; Vijay Govindarasu

doi:10.31127/tuje.1676459

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

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

Supporting Institution

Chennai Institute of Technology, Chennai, India.

Project Number

nil

Ethical Statement

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

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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Details

Primary Language

English

Subjects

Computational Methods in Fluid Flow, Heat and Mass Transfer (Incl. Computational Fluid Dynamics), Fluid Mechanics and Thermal Engineering (Other)

Journal Section

Research Article

Authors

Dr. Shıvakumar Nagareddy ^*
0000-0001-9084-9101
India

Ravi Subramanyam
0000-0003-1778-6516
India

Vijay Govindarasu
0009-0000-3220-8947
India

Early Pub Date

November 6, 2025

Publication Date

December 16, 2025

Submission Date

April 15, 2025

Acceptance Date

November 3, 2025

Published in Issue

Year 2026 Volume: 10 Number: 1

DOI

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

IZ

https://izlik.org/JA63KR33KY

Cite

RIS / Bibtex

APA

Nagareddy, D. S., Subramanyam, R., & Govindarasu, V. (2025). Effect on Energy Efficiency and Emissions of Duplex Circuit Air-Cooled Centralized Air-Conditioning System using HFC134a/SiO2 Nano-Fluid. Turkish Journal of Engineering, 10(1), 155-163. https://doi.org/10.31127/tuje.1676459

AMA

1.Nagareddy DS, Subramanyam R, Govindarasu V. Effect on Energy Efficiency and Emissions of Duplex Circuit Air-Cooled Centralized Air-Conditioning System using HFC134a/SiO2 Nano-Fluid. TUJE. 2025;10(1):155-163. doi:10.31127/tuje.1676459

Chicago

Nagareddy, Dr. Shıvakumar, Ravi Subramanyam, and Vijay Govindarasu. 2025. “Effect on Energy Efficiency and Emissions of Duplex Circuit Air-Cooled Centralized Air-Conditioning System Using HFC134a SiO2 Nano-Fluid”. Turkish Journal of Engineering 10 (1): 155-63. https://doi.org/10.31127/tuje.1676459.

EndNote

Nagareddy DS, Subramanyam R, Govindarasu V (December 1, 2025) Effect on Energy Efficiency and Emissions of Duplex Circuit Air-Cooled Centralized Air-Conditioning System using HFC134a/SiO2 Nano-Fluid. Turkish Journal of Engineering 10 1 155–163.

IEEE

[1]D. S. Nagareddy, R. Subramanyam, and V. Govindarasu, “Effect on Energy Efficiency and Emissions of Duplex Circuit Air-Cooled Centralized Air-Conditioning System using HFC134a/SiO2 Nano-Fluid”, TUJE, vol. 10, no. 1, pp. 155–163, Dec. 2025, doi: 10.31127/tuje.1676459.

ISNAD

Nagareddy, Dr. Shıvakumar - Subramanyam, Ravi - Govindarasu, Vijay. “Effect on Energy Efficiency and Emissions of Duplex Circuit Air-Cooled Centralized Air-Conditioning System Using HFC134a SiO2 Nano-Fluid”. Turkish Journal of Engineering 10/1 (December 1, 2025): 155-163. https://doi.org/10.31127/tuje.1676459.

JAMA

1.Nagareddy DS, Subramanyam R, Govindarasu V. Effect on Energy Efficiency and Emissions of Duplex Circuit Air-Cooled Centralized Air-Conditioning System using HFC134a/SiO2 Nano-Fluid. TUJE. 2025;10:155–163.

MLA

Nagareddy, Dr. Shıvakumar, et al. “Effect on Energy Efficiency and Emissions of Duplex Circuit Air-Cooled Centralized Air-Conditioning System Using HFC134a SiO2 Nano-Fluid”. Turkish Journal of Engineering, vol. 10, no. 1, Dec. 2025, pp. 155-63, doi:10.31127/tuje.1676459.

Vancouver

1.Dr. Shıvakumar Nagareddy, Ravi Subramanyam, Vijay Govindarasu. Effect on Energy Efficiency and Emissions of Duplex Circuit Air-Cooled Centralized Air-Conditioning System using HFC134a/SiO2 Nano-Fluid. TUJE. 2025 Dec. 1;10(1):155-63. doi:10.31127/tuje.1676459

Cited By

Model Order Reduction of Vehicle Air-Conditioning Loop with Neural Networks

Engineering Perspective

https://doi.org/10.64808/engineeringperspective.1817878