4.7 Article

Performance assessment of open thermochemical energy storage system for seasonal space heating in highly humid environment

期刊

RENEWABLE ENERGY
卷 201, 期 -, 页码 204-223

出版社

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.renene.2022.10.075

关键词

Seasonal heat storage; Open thermochemical energy storage; Salt hydrate; Characterization; Agglomeration; Deliquescence

资金

  1. Science and Engineering Research Board India
  2. SERB, DST, INDIA [CRG/2021/000221]
  3. Department of Science and Technology, SwarnaJayanti Fellowship, Government of India [DST/SB/SJF/2021-22/07-G]

向作者/读者索取更多资源

This study investigates the dehydration and hydration process of strontium bromide salt in open TCES system under high humidity conditions through experiments and numerical simulations. The results show that the salt can agglomerate or deliquesce in high humidity environment, which affects the system performance.
Open thermochemical energy storage (TCES) systems compactly store heat as chemical energy and are appropriate as seasonal heat storage for space heating. Often salt hydrates are employed as the solid reactants in open TCES, which undergo reversible reactions with water vapour present in the ambient air. Depending on the ambient air conditions, the salt may agglomerate or deliquesce, affecting the system's performance. In this work, thermogravimetry (TGA), X-ray diffractometry (XRD), and scanning electron microscopy (SEM) techniques are used to characterize the strontium bromide salt. Subsequently, the dehydration and hydration of the reactive salt (SrBr2.6H2O) are investigated experimentally under high humidity conditions in a laboratory-scale setup of open TCES located in Mumbai, India. During dehydration, high ambient humidity causes deliquescence at the beginning, resulting in agglomeration as the salt dries during the process. Consequently, a low global conversion of 0.15 and a charging efficiency of 3.5 +/- 0.2% are achieved. During hydration, the dehydrated salt completely hydrates. Nevertheless, the salt deliquesces under high ambient humidity, resulting in increased heat capacity of the reactive bed and the formation of salt lumps. Consequently, a decreased local hydration rate is achieved. The reactive bed provides a maximum temperature lift of 2.1 K to the airflow and discharging efficiency of 35 +/- 2%. The results obtained from numerical simulations performed using the transient model of the reactive bed show good qualitative agreement with the experimental results.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.7
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据