Numerical analysis of charging and discharging performance of a thermal energy storage system with encapsulated phase change material

被引：112

作者：

Bellan, Selvan ^{[1
]}

Gonzalez-Aguilar, Jose ^{[1
]}

Romero, Manuel ^{[1
]}

Rahman, Muhammad M. ^{[2
,3
]}

Goswami, D. Yogi ^{[2
,4
]}

Stefanakos, Elias K. ^{[2
,5
]}

Couling, David ^{[6
]}

机构：

[1] IMDEA Energy Inst, Mostoles 28935, Spain

[2] Univ S Florida, Clean Energy Res Ctr, Tampa, FL USA

[3] Univ S Florida, Dept Mech Engn, Tampa, FL 33620 USA

[4] Univ S Florida, Dept Chem & Biomed Engn, Tampa, FL USA

[5] Univ S Florida, Dept Elect Engn, Tampa, FL 33620 USA

[6] EON New Build & Technol Ltd, Nottingham NG11 0EE, England

来源：

APPLIED THERMAL ENGINEERING | 2014年 / 71卷 / 01期

关键词：

Latent thermal energy storage; Thermocline system; Encapsulated phase change material; Molten salt; Concentrating solar power; LATENT-HEAT STORAGE; PCM CAPSULES; PACKED-BEDS; GAS-FLOW; CONDUCTIVITY;

D O I：

10.1016/j.applthermaleng.2014.07.009

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

The objective of this paper is to develop a two dimensional two-phase model to study the dynamic behavior of a packed bed thermal energy storage system, which is composed of spherical capsules of encapsulated phase change material (PCM-sodium nitrate) and high temperature synthetic oil (Therminol 66) as heat transfer fluid. The heat transfer coefficient is calculated based on the phase change process inside the capsule by enthalpy formulation model and the flow inside the system is predicted by solving the extended Brinkman equation. After model validation, the developed model is used to investigate the influence of capsule size, fluid temperature (Stefan number), tank size (length and diameter), fluid flow rate and the insulation layer thickness of tank wall on the performance of the system. The dynamic behavior of the system, subjected to partial charging and discharging cycles, is also analyzed. It is found that increasing the capsule size, fluid flow rate, or decreasing the Stefan number, results in an increase in the thermocline region which finally decreases the effective discharge time and the total utilization. (C) 2014 Elsevier Ltd. All rights reserved.

引用

页码：481 / 500

页数：20

共 45 条

[1] Numerical analysis of a cool-thermal storage system with a thermal conductivity enhancer operating under a freezing condition [J].