不同配置下金属泡沫复合相变材料在三层管潜热储存系统中的同时充放电

IF 1 Q4 ENGINEERING, CHEMICAL

Chemical Product and Process Modeling Pub Date : 2023-05-04 DOI:10.1515/cppm-2023-0003

Md Tabrez Alam, Anoop K. Gupta

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引用次数: 0

摘要

相变材料（PCM）一方面具有高潜热，但另一方面热导率低，这限制了其在热能存储应用中的应用。因此，为了提高PCM的热性能，已经采用了各种技术。本数值工作旨在估计三管换热器（TTHX）的七种不同配置（M1–M7）中，在同时充放电（SCD）条件下，使用两侧的传热流体（HTF）的铜金属泡沫（MF）的影响。从优化的角度考虑了五种不同的PCM和复合PCM（CPCM）体积相等的配置。RT55（熔化温度=327 K）被视为PCM。基于PCM的热物理性质和加热管上的热边界条件，无量纲控制参数如瑞利数（Ra）、普朗特数（Pr）和斯特凡数（Ste）分别取1.79×105、30和0.21。报道了熔体分数、潜热储存、温度等值线、稳态熔体分数和相应的熔融时间的典型结果。在2的固定持续时间内，对所有配置产生的性能进行了比较 h.MF的定位在很大程度上影响潜热存储单元中的传热机制。结果表明，由于浮力诱导的对流增强，MF的底侧定位可以提高储热能力。在所有模型中，M3预测了在最短的稳态熔融时间（t ss≈66）内最高的稳态熔融分数（λ$\lambda$ss≈0.62） min），然后是M6型号（λss≈0.58，t ss≈65 分钟）。优化设计（M3型）显示～75 % 潜热储存比纯PCM（M1）情况增强。有趣的是，一个人也可以达到～17.2 % 使用模型M3比M2具有更高的增强，但仅具有比在全多孔结构（M2）中使用的MF质量的一半的MF质量。

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Simultaneous charging and discharging of metal foam composite phase change material in triplex-tube latent heat storage system under various configurations

Abstract Phase change material (PCM) has high latent heat on one hand albeit low thermal conductivity on the other hand which restricts its utilization in thermal energy storage applications. Therefore, to improve thermal performance of PCM, various techniques have been employed. This numerical work intends to estimate the effect of copper metal foam (MF) in the seven various configurations (M1–M7) of triple-tube heat exchanger (TTHX) under simultaneous charging and discharging (SCD) conditions using heat transfer fluids (HTF) both the sides. Five distinct configurations with equal volumes of PCM and composite PCM (CPCM) have been considered for optimization standpoint. RT55 (melting temperature = 327 K) is taken as PCM. Based on thermo-physical properties of PCM and thermal boundary conditions on the heated tube, the dimensionless controlling parameters such as the Rayleigh number (Ra), Prandtl number (Pr), and Stefan number (Ste) were taken as 1.79 × 105, 30, and 0.21, respectively. Typical results on melt fraction, latent heat storage, temperature contours, and steady-state melt fraction and corresponding melting time have been reported. Performance yielded by all the configurations was compared for a fixed duration of 2 h. The positioning of MF largely affects the heat transfer mechanism in the latent heat storage unit. Results show that the bottom-side positioning of MF can boost the heat storage due to enhanced buoyancy-induced convection. Among all the models, M3 predicts the highest steady-state melt fraction (λ$\lambda $ ss ≈ 0.62) in the shortest steady-state melting time (t ss ≈ 66 min), followed by model M6 (λ ss ≈ 0.58, t ss ≈ 65 min). The optimized design (model M3) shows ∼75 % latent heat storage enhancement than pure PCM (M1) case. Interestingly, one may also achieve ∼17.2 % higher enhancement using model M3 than M2 but with only half of the mass of MF than that used in full porous configuration (M2).

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来源期刊

Chemical Product and Process Modeling ENGINEERING, CHEMICAL-

CiteScore

2.10

自引率

11.10%

发文量

期刊介绍： Chemical Product and Process Modeling (CPPM) is a quarterly journal that publishes theoretical and applied research on product and process design modeling, simulation and optimization. Thanks to its international editorial board, the journal assembles the best papers from around the world on to cover the gap between product and process. The journal brings together chemical and process engineering researchers, practitioners, and software developers in a new forum for the international modeling and simulation community. Topics: equation oriented and modular simulation optimization technology for process and materials design, new modeling techniques shortcut modeling and design approaches performance of commercial and in-house simulation and optimization tools challenges faced in industrial product and process simulation and optimization computational fluid dynamics environmental process, food and pharmaceutical modeling topics drawn from the substantial areas of overlap between modeling and mathematics applied to chemical products and processes.