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Thermal performance analysis of multi-slab phase change thermal energy storage unit with heat transfer enhancement approaches

机译：热传递增强方法多板相变热能存储单元的热性能分析

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摘要

A novel multi-slab thermal energy storage (TES) unit with NaNO3 as PCM is designed for concentrating solar thermal power plants due to its easy manufacture and high energy storage density. A numerical model, based on the k - epsilon turbulence model, is used in studying the thermal performance of the system. To enhance the efficiency, two heat transfer enhancement methods are compared with the original unit, which is adding plate fins or 10 wt%EG into NaNO3. The numerical model is validated to be reliable for simulating the heat transfer with natural convection by a lab-built rig. The numerical results show that adding fins shortens the phase change time by up to 18% with an HTF flow rate of 4.0 x 10(-3) m(3)/s in each channel and adding 10 wt%EG is the most effective way to enhance the heat transfer. The role of natural convection in heat transfer is analyzed. In practical applications, the sensible heat during the charging/ discharging process cannot be neglected, which occupies 45%-55% of the total heat stored/released. This paper is expected to provide a detailed investigation of the thermal performance of the unit with two different thermal enhancement methods to give some rational advice in optimizing the system design and operation. (c) 2021 Elsevier Ltd. All rights reserved.
机译：由于其易于制造和高能量存储密度，具有纳米作为PCM的新型多板热能存储（TES）单元。基于K - Epsilon湍流模型的数值模型用于研究系统的热性能。为了提高效率，将两种传热增强方法与原始单元进行比较，该方法将板翅片或10wt％加入纳米3。验证数值模型可靠，用于模拟实验室内置钻机的自然对流传热。数值结果表明，添加翅片在每个通道中的HTF流量为4.0×10（3）m（3）/ s的HTF流速缩短相变时间，并加入10wt％，例如最有效的方式增强传热。分析了自然对流在热传递中的作用。在实际应用中，不能忽视充电/放电过程中的明智热量，其占据总热量/释放的总热量的45％-55％。本文预计将详细调查与两种不同的热增强方法的单位热性能进行详细调查，以提供一些合理的建议，以优化系统设计和操作。 （c）2021 elestvier有限公司保留所有权利。

著录项

  • 来源
    《Renewable energy》 |2021年第7期|46-56|共11页
  • 作者

    Zhou Dan; Wu Shaowen; Wu Zhigen; Yu Xingjuan;

  • 作者单位

    Tongji Univ Coll Environm Sci & Engn State Key Lab Pollut Control & Resource Reuse Shanghai 200092 Peoples R China|Univ Glasgow James Watt Sch Engn Glasgow G12 8QQ Lanark Scotland;

    Tongji Univ Coll Environm Sci & Engn State Key Lab Pollut Control & Resource Reuse Shanghai 200092 Peoples R China;

    Tongji Univ Coll Environm Sci & Engn State Key Lab Pollut Control & Resource Reuse Shanghai 200092 Peoples R China|Shanghai Inst Pollut Control & Ecol Secur Shanghai Peoples R China;

    Tongji Univ Coll Environm Sci & Engn State Key Lab Pollut Control & Resource Reuse Shanghai 200092 Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Thermal energy storage (TES); Phase change material (PCM); Expanded graphite (EG); Turbulent flow; Enhanced heat transfer;

    机译：热能储存（TES）;相变材料（PCM）;膨胀石墨（例如）;湍流;增强的传热;

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