Vol. 15 | No. 3 |1812-1815| July - September | 2022 ISSN: 0974-1496 | e-ISSN: 0976-0083 | CODEN: RJCABP http://www.rasayanjournal.com http://www.rasayanjournal.co.in Rasayan J. Chem., 15(3), 1812-1815(2022) http://doi.org/10.31788/RJC.2022.1536807 This work is licensed under a CC BY 4.0 license. PERFORMANCE EVALUATION OF VARYING NANOPARTICLES DERIVED FROM ALOE VERA PLANT FOR DOMESTIC REFRIGERATION SYSTEM S. A. Afolalu 1 , O. M. Ikumapayi 1, , O. Okwilagwe 2 , O. O. Yusuf 3 and O. R. Oloyede 1 1 Department of Mechanical and Mechatronics Engineering, Afe Babalola University, Ado Ekiti, 360101, Nigeria 2 Department of Mechanical Engineering, Covenant University, KM. 10 Idiroko Road, Canaan Land, Ota, 112212, Nigeria 3 Department of Microbiology, Obafemi Awolowo University, Ile-Ife, 220282, Nigeria  Corresponding Author: Ikumapayi.omolayo@abuad.edu.ng ABSTRACT The production of Zinc oxide (ZnO) nanoparticles was made from the aloe vera plant which served as the reductant and this was mixed with mineral oil to decrease compressor effort in order to raise the efficiency of a domestic vapour compression refrigeration system. The nanoparticles were dissolved in mineral oil at different proportions of 1.50 grams, 1.25 grams, 1.00 grams, 0.75 grams as well as 0.5 grams each in 250 ml. The system was monitored for about three hours forty-five minutes (225 minutes) per sample, and the parameters for comparison are the discharge temperatures, pull-down time, and net refrigeration effect. The results indicate a reduction in discharge temperature by 4-10% from 0.2 wt. %, 0.5 wt. %, and 0.6 wt. %, and a lower pull downtime of 40% from 0.2 wt. % concentration as compared to the values from the control specimen, which contained pure mineral oil. Keywords: Nanotechnology, Nanoparticle, Refrigeration, Refrigerant, Lubricating Oil. RASĀYAN J. Chem., Vol. 15, No.3, 2022 INTRODUCTION Long before refrigerators (fridges and freezers) came into existence, people found out that food was more preserved in the wintertime than during summer. Hence, the use of natural ice began. Large chunks of ice in polar or cold regions would be cut out and transported manually by a team over a long distance to be sold out to others who would keep the ice in their food “storage rooms” with heat-insulated walls using sawdust. 1-2 Later on, the addition of salts like sodium nitrates and common salts were discovered to “bring down” the temperature of the water. 3 Refrigeration, in thermodynamic terms, is the process of moving heat from a low-temperature reservoir to a high-temperature reservoir. Refrigeration is simply absorbing heat from a material. 4 There are four major components in any refrigeration system: the evaporator, the compressor, the condenser, as well as the expansion valve or throttling valve. 5 A refrigerant is a liquid or gaseous fluid that produces cooling. This substance absorbs heat at a low-temperature level in one location and rejects it at a higher temperature and pressure level in another location. 6 Hydrocarbons and hydrofluorocarbons are common refrigerants. Another fluid used in the refrigeration system is a lubricant or lubricating oil. The lubricant is essential in lubricating the compressor and other metal components that are susceptible to rust. This, in turn, reduces the heat produced during friction and prolongs the life of the parts by reducing wear and tear. For refrigerator manufacturers, this entails developing specific blends that are suitable for the coolant, the refrigerator, and the surroundings. The lubricant uses the heat from the refrigeration process to increase its vapour pressure, allowing it to disperse to the compressor and other heated components. The lubricant to be used mainly depends on the compressor's capacity in British thermal units. 7-8 However, in as much as there are many advantages of using lubricating oils in a refrigeration system, they pose several concerns. Among these concerns are environmental and human health issues in the disposal of used oil and production costs. 9 After reviewing various literature using nano lubricants and nanorefrigerants experimentally, that nano lubricants can upgrade the thermal and mechanical performance