Numerical and thermo-energy analysis of cycling in automotive air-conditioning operating with hybrid nanolubricants and R1234YF

Mohd Zaki, Sharif and Azmi, Wan Hamzah and Mohd Fairusham, Fairusham Ghazali and Nurul Nadia Mohd, Zawawi and Hafiz Muhammad, Ali (2023) Numerical and thermo-energy analysis of cycling in automotive air-conditioning operating with hybrid nanolubricants and R1234YF. Numerical Heat Transfer, Part A: Applications, 83 (9). pp. 935-957. ISSN 1521-0634

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Abstract

Studies on automotive air-conditioning (AAC) systems involving compressor on-off cycling are still limited. This study focuses on improving the cycling of the AAC system using hybrid nanolubricants and hydrofluoroolefin-1234yf refrigerant. A dynamic model for an AAC system with a thermostatic switch that controls the on-off compressor was developed. The model was built in MATLAB Simulink and based on the state-space model using the fundamental conservation principles at the condenser, evaporator, and expansion valve. The experimental data were used to calculate the AAC system pressure, compressor, heat transfer coefficient of the condenser-evaporator, and expansion valve setting. The validation of the experimental data and the predicted data by the simulation suggested that the dynamic model could predict the AAC system’s performance within ±5% deviation. The AAC system operating with Al2O3-SiO2/PAG nanolubricants has a lower temperature cycling frequency than the AAC system with the original PAG lubricant, representing less energy consumed. In addition, the AAC system with hybrid nanolubricants was performed with lower power consumption and significantly higher cooling capacity than the original system. The present simulation confirmed the feasibility of hybrid nanolubricants for application in an AAC system with a thermo-static switch.

Item Type:	Article
Uncontrolled Keywords:	Automotive air-conditioning, cooling capacity, cycling simulation, dynamic model, hybrid nanolubricants, power consumption
Divisions:	Faculty of Mechanical and Manufacturing Engineering Technology
Depositing User:	Norfaradilla Idayu Ab. Ghafar
Date Deposited:	19 Jun 2024 09:39
Last Modified:	19 Jun 2024 09:39
URI:	http://eprints.utem.edu.my/id/eprint/27097
Statistic Details:	View Download Statistic

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