Experimental Study of LiCl/LiBr-Zeolite Composite Adsorbent for Thermochemical Heat Storage
Experimental Study of LiCl/LiBr-Zeolite Composite Adsorbent for Thermochemical Heat Storage
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DOI：
10.3390/buildings12112001
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发表时间：
2022-11
期刊：
影响因子：
3.8
通讯作者：
Depeng Chen;Xin Chen;Zhiwei Ma;Yaodong Wang;A. Roskilly;Jian Zhou
中科院分区：
文献类型：
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作者：
Depeng Chen;Xin Chen;Zhiwei Ma;Yaodong Wang;A. Roskilly;Jian Zhou
基于吸附的热化学蓄热是一种很有前途的可用于季节性空间供暖的长期储能技术，已得到大量的研究和开发。本文研究了由LiCl + LiBr盐与3A分子筛制备的复合吸附剂的储热性能。实验测试了复合材料组的基本特性，发现含15wt%盐溶液的吸附复合材料具有优异的吸附速率和吸附容量，被认为是最佳的复合材料。此外，该复合材料的储热密度可高达585.3J/g，比纯沸石高出30.9%。使用3 kg的复合材料，使用实验室规模的反应器进行吸附储热实验。考察了空气流速和相对湿度对吸附性能的影响。结果表明，在15 m3/h的流量和70%的相对湿度下，复合材料的吸附热释放量最大，能量释放效率为74.3%。在此基础上，建立了吸附式蓄热系统和住宅模型，并利用TRNERGY软件对该系统的建筑采暖效果进行了评价。发现环境温度会影响吸附式蓄热系统的供热效果。该模型的性能系数（COP）高达6.67。与燃气锅炉供热系统相比，吸附式蓄热可以替代部分燃气消耗，实现节能。
Adsorption-based thermochemical heat storage is a promising long-term energy storage technology that can be used for seasonal space heating, which has received significant amount of efforts on the research and development. In this paper, the heat storage capacity of composite adsorbents made by LiCl + LiBr salt and 3A zeolite was investigated. The basic characteristics of composite material groups were experimentally tested, and it was found that the adsorption composite with 15 wt% salt solution had excellent adsorption rate and adsorption capacity, which was considered as the optimal composite material. Furthermore, the heat storage density of the composite material could be as high as 585.3 J/g, which was 30.9% higher than that of pure zeolite. Using 3 kg of the composite material, the adsorption heat storage experiment was carried out using a lab-scale reactor. The effects of air velocity and relative humidity on the adsorption performance were investigated. It was found that a flow rate of 15 m3/h and a relative humidity of 70% led to the most released adsorption heat from the composite material, and 74.3% of energy discharge efficiency. Furthermore, an adsorption heat storage system and a residential model were built in the TRNSYS software to evaluate the building heating effect of such heat storage system. It is found that the ambient temperature will affect the heating effect of the adsorption heat storage system. The coefficient of performance (COP) of this model is as high as 6.67. Compared with the gas boiler heating system, the adsorption heat storage energy can replace part of the gas consumption to achieve energy savings.