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EFFECT OF ROUGHNESS GEOMETRY ON HEAT TRANSFER AND FRICTION CHARACTERISTICS OF PCM STORAGE UNIT FOR NIGHT COOLNESS STORAGE IN SUMMER SEASON

ABSTRACT
This paper presents a theoretical analysis of thermal storage unit using phase change material (PCM) as storage medium. Storage unit consists of parallel rectangular channels for the air flow which are separated by phase change storage material. The purpose of storage unit is to absorb the night coolness and to provide cooled air at comfort temperature during day time in summer season. MATLsimulation tool has been used to compute the air temperature variation with location as well as time, charging and discharging time of storage unit. Phase change material used for analysis is selected in such a way that it’s Melting point lies between comfort temperature and minimum night ambient temperatures. The air flow rate needed for charging of PCM is approximately four times greater than the flow rate required during day time to achieve comfort temperature for approximately eight hours, due to limited summer night time (only eight hours). The length of storage unit for which NTU value is greater than or equal to five will give the exit air temperature equal to PCM temperature for the case of latent heat utilization. It is found that artificial roughness on the duct surface effectively reduces the length of storage unit in the cost of some extra pressure drop across the duct.
KEYWORDS
PAPER SUBMITTED: 2011-05-11
PAPER REVISED: 2012-02-10
PAPER ACCEPTED: 2012-02-10
DOI REFERENCE: https://doi.org/10.2298/TSCI110511023S
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2013, VOLUME 17, ISSUE 2, PAGES [365 - 375]
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© 2019 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, 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