Performance investigation of sleeve tube heat exchanger filled with multi-layer phase change materials

Ning WANG; Chenyu ZHANG; Hongtao XU; Jianfei ZHANG

doi:10.11949/0438-1157.20190609

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Performance investigation of sleeve tube heat exchanger filled with multi-layer phase change materials

Fluid dynamics and transport phenomena | 更新时间：2020-06-24

- Performance investigation of sleeve tube heat exchanger filled with multi-layer phase change materials
- CIESC Journal Vol. 70, Issue S2, Pages: 191-200(2019)
- 作者机构：
  
  1.上海理工大学能源与动力工程学院，上海市动力工程多相流动与传热重点实验室，上海 200093
  2.西安交通大学热流科学与工程教育部重点实验室，陕西西安 710049
- 作者简介：
- 基金信息：
- DOI：10.11949/0438-1157.20190609
  CLC： TK 512
- Received：02 June 2019，
  
  Revised：2019-06-19，
  
  Published：05 September 2019
- 稿件说明：
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王宁, 张晨宇, 徐洪涛, 张剑飞. 填充多级相变材料的套管式储热器性能研究[J]. 化工学报, 2019, 70(S2): 191-200

WANG Ning, ZHANG Chenyu, XU Hongtao, ZHANG Jianfei. Performance investigation of sleeve tube heat exchanger filled with multi-layer phase change materials[J]. CIESC Journal, 2019, 70(S2): 191-200
王宁, 张晨宇, 徐洪涛, 张剑飞. 填充多级相变材料的套管式储热器性能研究[J]. 化工学报, 2019, 70(S2): 191-200 DOI： 10.11949/0438-1157.20190609.

WANG Ning, ZHANG Chenyu, XU Hongtao, ZHANG Jianfei. Performance investigation of sleeve tube heat exchanger filled with multi-layer phase change materials[J]. CIESC Journal, 2019, 70(S2): 191-200 DOI： 10.11949/0438-1157.20190609.

摘要

提出一种填充三级相变材料的水平套管式储热器，并建立该储热器的综合性能评价指标，基于该指标数值预测和研究了分隔壁面、翅片布置和方向等参数对系统综合性能的影响。结果表明：分隔壁面对PCM的自然对流有明显的抑制作用，且相变温度越高，抑制效果越显著；相对于无翅片结构，在各级PCM中布置翅片的储热器的综合储热效率提高了约2.27倍；不同翅片布置方向下PCM液相率的变化可分为两个不同阶段，且均匀布置的翅片结构（Case2）具有较优的综合性能；各级PCM间熔化速率的不均匀性是制约系统整体储热性能的关键因素；Case5的翅片布置方式使各级PCM间熔化速率的均匀性明显改善，与Case2相比，其综合储热效率提高了28.30%。

Abstract

A horizontal sleeve tube heat exchanger filled with three-layer phase change materials is proposed

and a comprehensive storage density evaluation criterion of the heat storage device is established. Based on the criterion

the effects of separated walls

fin arrangements and direction are numerically predicted and investigated. The results show that the natural convection of PCM (phase change material) is significantly suppressed by separated walls

and the higher the phase change temperature

the more significant the suppression effect. Compared with the sleeve tube heat exchanger without fins

the comprehensive thermal storage efficiency for the exchanger with fins in each layer PCM is improved by 2.27 times. The variations of PCM liquid fraction can be divided into two different stages under various fin arrangement directions

and the evenly arranged fin structure (Case2) has superior thermal storage performance. The non-uniformity of the PCM melting rate in each layer is a key factor that restricts the overall system performance of the thermal storage characteristics. Compared with Case2

the uniformity of the melting rate between different-layer PCMs can be significantly improved by Case5

and the comprehensive thermal storage efficiency is improved by 28.30%.

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references

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