THERMAL SCIENCE

International Scientific Journal

EXPERIMENTAL INVESTIGATION ON THE INFLUENCE OF NANOFLUIDS USED AS HEAT TRANSFER FLUID IN PHASE CHANGE MATERIAL BASED THERMAL ENERGY STORAGE SYSTEM

ABSTRACT
The present study investigated the enhancement of energy conservation under the principles of pure substances that exercise phase change throughout charging and discharging processes. This work primarily focused on the thermal energy storage system, where the working medium charges the PCM namely (paraffin wax and stearic acid) that is normally encapsulated in spherical balls. The potentiality in charging of working medium was examined upon blending heat transfer fluid with four nanoparticles (Al2O3, CuO, TiO2, and MgO). Several volume concentration levels (0.2%, 0.5%, and 0.8%) were considered for afore mentioned nanoparticles under the influence of assumed flow rates (2, 4, and 6 L per minute). The experi-ments were carried out with various nanofluids used as heat transfer fluid for dif-ferent flow rates and volume concentrations. The results showed that there is a considerable amount of reduction in charging time, in case of 6 L per minute, 0.8% volume concentration and PCM as paraffin wax, around 27.22% for TiO2 nanofluid, 36.66% for Al2O3 nanofluid, 40.90% for CuO nanofluid, and 63.63% for MgO nanofluid, and PCM used as stearic acid, around 26.31% for TiO2 nanofluid, 42.10% for Al2O3 nanofluid, 47.36% for CuO nanofluid, and 68.42% for MgO nanofluid, when compared with water as the conventional heat transfer fluid. From the results, it was observed that the effect of particle concentration played an important role in the heat transfer process. During the discharging pro-cess, 210 L of hot water withdrawn with paraffin wax used as PCM and 198 L of hot water withdrawn with stearic acid used as PCM.
KEYWORDS
PAPER SUBMITTED: 2019-10-04
PAPER REVISED: 2020-01-10
PAPER ACCEPTED: 2020-01-20
PUBLISHED ONLINE: 2020-02-08
DOI REFERENCE: https://doi.org/10.2298/TSCI191004060R
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2021, VOLUME 25, ISSUE Issue 1, PAGES [643 - 652]
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© 2024 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence