Thermal Performance of Cold Storage Packed Bed for Air Conditioning with Modified Composite PCM Based on Eutectic Hydrated Salts

Huang Jinyan; Yin Yonggao

doi:10.12465/j.issn.0253-4339.2025.02.098

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Thermal Performance of Cold Storage Packed Bed for Air Conditioning with Modified Composite PCM Based on Eutectic Hydrated Salts

更新时间：2025-04-15

- Thermal Performance of Cold Storage Packed Bed for Air Conditioning with Modified Composite PCM Based on Eutectic Hydrated Salts
- Journal of Refrigeration Vol. 46, Issue 2, Pages: 98-108(2025)
- 作者机构：
  
  东南大学能源与环境学院　南京　 210096
- 作者简介：
  
  Yin Yonggao, male, professor, School of Energy and Environment, Southeast University, 86-13611515279, E-mail: y.yin@seu.edu.cn. Research fields: solution dehumidification and low-grade heat utilization, energy-saving in novel heat pump and air conditioning system, energy storage technology for building carbon neutrality.
- 基金信息：
- DOI：10.12465/j.issn.0253-4339.2025.02.098
  CLC： TB64;TK02
- Received：20 November 2023，
  
  Revised：22 December 2023，
  
  Accepted：2024-01-31，
  
  Published：16 April 2025
- 稿件说明：
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Huang Jinyan, Yin Yonggao. Thermal Performance of Cold Storage Packed Bed for Air Conditioning with Modified Composite PCM Based on Eutectic Hydrated Salts[J]. Journal of refrigeration, 2025, 46(2): 98-108.
DOI：

Huang Jinyan, Yin Yonggao. Thermal Performance of Cold Storage Packed Bed for Air Conditioning with Modified Composite PCM Based on Eutectic Hydrated Salts[J]. Journal of refrigeration, 2025, 46(2): 98-108. DOI： 10.12465/j.issn.0253-4339.2025.02.098.

摘要

针对蓄冷空调温度需求，研制一种以Na

·10H

O和Na

HPO

·12H

O为基材的复合相变蓄冷材料，其相变温度为8.3 ℃，相变潜热为151.3 kJ/kg，与前期工作相比，其潜热值提升14.24%。同时提出一种使用球形封装单体封装该相变材料（PCM）的填充床蓄冷装置，并采用EDEM软件对其建立无序堆积三维物理模型，研究单体尺寸、换热流体（HTF）入口温度和流量等参数对填充床蓄冷性能的影响。结果表明：减小单体尺寸、降低HTF入口温度和提升HTF入口流量均能加快装置的蓄冷过程，缩短蓄冷时间。HTF入口温度由2 ℃升至4 ℃时，填充床的蓄冷量和蓄冷密度降低5%，平均蓄冷速率降低41.93%，压降基本不变。然而单体尺寸对填充床蓄冷量和蓄冷密度等参数的影响并未表现出明显规律，在工程应用中需根据实际情况而定。研究结果可为填充床装置在蓄冷空调领域的推广应用提供理论指导。

Abstract

A composite cold storage phase change material (PCM) based on Na

·10H

O and Na

HPO

·12H

O was developed to meet the temperature requirements of cold storage air conditioning. The phase change temperature was 8.3 ℃

with a latent heat of 151.3 kJ/kg

representing a 14.24% increase in latent heat compared to previous works. Additionally

a novel thermal energy storage device utilizing spherical encapsulated PCM within a packed bed was proposed. A three-dimensional physical model of the packed bed was constructed using EDEM software to study the effects of sphere capsule size

inlet temperature

and heat transfer fluid (HTF) flow rate on the system's thermal performance. Results show that reducing the sphere capsule size

lowering the HTF inlet temperature

and increasing the HTF flow rate accelerate the thermal energy storage process and reduce charging time. For instance

when the HTF inlet temperature increases from 2 ℃ to 4 ℃

the packed bed's cold storage capacity and density decrease by 5%

the average cold storage rate drops by 41.93%

and the pressure drop remains relatively constant. However

the effect of sphere capsule size on thermal energy storage capacity and density lacks a clear trend and depends on specific engineering applications. These findings offer theoretical guidance for the practical application and broader use of packed-bed thermal energy storage systems for air conditioning.

关键词

Keywords

references

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