Performance of liquid-line magnets and CNT nano-lubricant in a refrigerator with varying mass charge of R600a refrigerant

Adelekan, D.S and Ohunakin, O.S. and Paul, B.S. and Jen, Tien-Chien (2024) Performance of liquid-line magnets and CNT nano-lubricant in a refrigerator with varying mass charge of R600a refrigerant. Journal of Thermal Analysis and Calorimetry, 149. pp. 8161-8172.

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Abstract

Improving the performance of drop-in hydrocarbon refrigerants for the increasing in-flow of conventional refrigerators to Nigeria is a necessary sustainable strategy. This experimental study investigates the enhancement limits of a liquid-line magnetic field, CNT nano-lubricant, and a combination of both on an R134a domestic refrigerator with 40–70 g each of R600a refrigerants. The study compares the performance of R600a refrigerant without enhancements (pure) and with two pairs of 3000 Gauss liquid-line mounted O-ring permanent magnets (Mag), 0.2 g L−1 concentration of CNT nano-lubricant (Nano), and both liquid-line magnet and CNT nano-lubricant (Mag-Nano). Test parameters include evaporator air temperature, discharge pressure, power consumption, coefficient of performance (COP), and total equivalent warming impact (TEWI). The results show that enhancement methods led to higher COP in the range of 16.64–42.38%. At the same time, evaporator air temperature, discharge pressure, power consumption, and TEWI were lower by 9.76% to 20.96%, 17.75% to 34.26%, 5.22% to 13.42%, and 5.88% to 10.86%, respectively. In conclusion, the proposed enhancement techniques in the refrigeration system provide normal, safe, and efficient operation.

Item Type:	Article
Uncontrolled Keywords:	Nano-lubricant  Refrigerator  MWCNT  Liquid-line magnet  R600a  R134a
Subjects:	T Technology > TJ Mechanical engineering and machinery T Technology > TP Chemical technology
Divisions:	Faculty of Engineering, Science and Mathematics > School of Engineering Sciences
Depositing User:	Patricia Nwokealisi
Date Deposited:	13 Jan 2025 15:37
Last Modified:	13 Jan 2025 15:37
URI:	http://eprints.covenantuniversity.edu.ng/id/eprint/18694

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