| Research on the chemical adsorption precursor state of CaCl_2-NH_3 for adsorption refrigeration |
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| 引用本文： | WANG Liwei,WANG Ruzhu,WU Jingyi & WANG Kai Institute of Refrigeration and Cryogenics,Shanghai Jiao Tong University,Shanghai 200030,China. Research on the chemical adsorption precursor state of CaCl_2-NH_3 for adsorption refrigeration[J]. 中国科学E辑(英文版), 2005, 48(1): 70-82. DOI: 10.1360/04ye0129 |
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| 作者姓名： | WANG Liwei WANG Ruzhu WU Jingyi & WANG Kai Institute of Refrigeration and Cryogenics Shanghai Jiao Tong University Shanghai 200030 China |
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| 作者单位： | WANG Liwei,WANG Ruzhu,WU Jingyi & WANG Kai Institute of Refrigeration and Cryogenics,Shanghai Jiao Tong University,Shanghai 200030,China |
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| 摘 要： | Environment and energy resources are two critical global problems. Adsorption re-frigeration, as an environmental friendly and energy saving technology [1], attracts moreand more attention in recent years. Adsorption refrigeration mainly includes physical adsorption and chemical adsorp-tion. As a type of chemical adsorption working pair, CaCl2-NH3 has the prominent ad-vantage of large adsorption quantity. However, CaCl2-NH3 also has several disadvan-tages, such as performance attenuat…
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Research on the chemical adsorption precursor state of CaCl2−NH3 for adsorption refrigeration |
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| Wang?Liwei,Wang?Ruzhu?Email author,Wu?Jingyi,Wang?Kai. Research on the chemical adsorption precursor state of CaCl2−NH3 for adsorption refrigeration[J]. Science in China(Technological Sciences), 2005, 48(1): 70-82. DOI: 10.1360/04ye0129 |
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| Authors: | Wang?Liwei,Wang?Ruzhu? author-information" > author-information__contact u-icon-before" > mailto:rzwang@sjtu.edu.cn" title=" rzwang@sjtu.edu.cn" itemprop=" email" data-track=" click" data-track-action=" Email author" data-track-label=" " >Email author,Wu?Jingyi,Wang?Kai |
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| Affiliation: | Institute of Refrigeration and Cryogenics, Shanghai Jiao Tong University, Shanghai 200030, China |
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| Abstract: | As a type of chemical adsorption working pair, the physical adsorption occurs first for CaCl2-NH3 because the effective reaction distance for van der Waals force is longer than that for chemical reaction force, and this physical adsorption state is named the precursor state of chemical adsorption. In order to get the different precursor states of CaCl2-NH3, the different distances between NH3 gas and Ca2+ are realized by the control of different phenomena of swelling and agglomeration in the process of adsorption. When the serious swelling exists while the agglomeration does not exist in the process of adsorption, experimental results show that the activated energy consumed by adsorption reaction increases for the reason of longer distance between Ca2+ and NH3, and at the same time the performance attenuation occurs in the repeated adsorption cycles. When the agglomeration occurs in the process of adsorption, the activated energy for the transition from precursor state to chemical adsorption decreases because the distance between NH3 gas and Ca2+ is shortened by the limited expansion space of adsorbent, and at the same time the performance attenuation does not occur. The adsorption refrigeration isobars are researched by the precursor state of chemical adsorption; results also show that the precursor state is a key factor for isobaric adsorption performance while the distribution of Ca2+ does not influence the permeation of NH3 gas in adsorbent. |
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| Keywords: | refrigeration chemical adsorption precursor state of chemical adsorption attenuation activated energy. |
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