Performance investigation of a lab-scale latent heat storage prototype - Numerical results
Performance investigation of a lab-scale latent heat storage prototype - Numerical results
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DOI：
10.1016/j.enconman.2016.12.075
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发表时间：
2017-03-01
影响因子：
10.4
通讯作者：
Muthukumar, P.
中科院分区：
文献类型：
--
作者：
Niyas, Hakeem;Prasad, Sunku;Muthukumar, P.
在目前的研究中，数值分析的充电和放电特性的实验室规模的潜热存储（LHS）原型。建立了管壳式换热器LHS样机性能分析的数学模型。采用有效热容（EHC）方法考虑相变材料（PCM）的潜热，采用Boussinesq近似考虑PCM熔融层的浮力效应。为了正确地模拟PCM中的速度，增加了达西定律的源项。使用基于有限元的软件产品COMSOL Multiphysics 4.3a求解模型中涉及的控制方程。根据模型的放电时间，对埋管数和埋管上的翅片数进行了优化。各种性能参数，如充电/放电时间，储能/放电速率和熔体分数进行了评价。数值预测的模型在充电和放电过程中的温度变化进行了比较，从实验室规模的LHS原型提取的实验数据，发现它们之间有很好的协议。(C)2016爱思唯尔有限公司版权所有
In the current study, numerical analysis of the charging and discharging characteristics of a lab-scale latent heat storage (LHS) prototype is presented. A mathematical model is developed to analyze the performance characteristics of the LHS prototype of shell and tube heat exchanger configuration. Effective heat capacity (EHC) method is implemented to consider the latent heat of the phase change material (PCM) and Boussinesq approximation is used to incorporate the buoyancy effect of the molten layer of the PCM in the model. For proper modeling of velocities in the PCM, Darcy law's source term is added. The governing equations involved in the model are solved using a finite element based software product, COMSOL Multiphysics 4.3a. The number of embedded tubes and fins on the embedded tubes are optimized based on the discharging time of the model. Various performance parameters such as charging/discharging time, energy storage/discharge rate and melt fraction are evaluated. Numerically predicted temperature variations of the model during charging and discharging processes were compared with the experimental data extracted from the lab-scale LHS prototype and a good agreement was found between them. (C) 2016 Elsevier Ltd. All rights reserved.