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Heat transfer enhancement of phase change materials by ﬁns under simultaneous charging and discharging
journal contributionposted on 2023-05-19, 18:57 authored by Joybari, MM, Haghighat, F, Seddegh, S, Al-Abidi, AA
Due to the inherent intermittency of renewable energy sources such as solar, latent heat thermal energy storagein phase change materials (PCMs) has received considerable attention. Among several techniques to enhance PCMs’ thermal conductivity, the majority of studies have focused on ﬁn integration due to its simplicity, ease of manufacturing, and low cost. In this study, utilization of extended surfaces (by longitudinal ﬁns) was investigated by development of a numerical model to study the performance of a triplex tube heat exchanger (TTHX) equipped with a PCM under simultaneous charging and discharging (SCD). Governing equations were developed and numerically solved using ANSYS Fluent v16.2. Three conventional ﬁn geometries and six developed ﬁn conﬁgurations were compared based on the temperature, liquid fraction, and natural convectionbehavior under both SCD and non-SCD conditions. The intensity of natural convection was investigated for diﬀerent ﬁns for the inside heating/outside cooling scenario based on the solid–liquid interface evolution overtime. The results indicated that since the buoyancy forces induce upward melted PCM motion, the inner hot tube requires ﬁns on its lower half, while the outer cold one should be extended from its upper half. It was concluded that the case with 3 hot tube ﬁns and 1 cold tube ﬁn is most compatible with natural convection and provides the best performance under SCD conditions.
Publication titleEnergy Conversion and Management
Department/SchoolSchool of Engineering
PublisherPergamon-Elsevier Science Ltd
Place of publicationThe Boulevard, Langford Lane, Kidlington, Oxford, England, Ox5 1Gb
Rights statement© 2017 Elsevier Ltd. All rights reserved.