Kinetics of water adsorption in microporous aluminophosphate layers for regenerative heat exchangers |
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| Authors: | Hendrik van Heyden Gunther Munz Lena Schnabel Ferdinand Schmidt Svetlana Mintova Thomas Bein |
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| Affiliation: | 1. Department of Chemistry and Biochemistry, University of Munich (LMU), Butenandtstraße 11, 81377 Munich, Germany;2. Fraunhofer-Institute for Solar Energy Systems (ISE), Heidenhofstraße 2, 79110 Freiburg, Germany;3. Laboratoire de Matériaux à Porosité contrôlée, UMR 7016 CNRS, 3 rue Alfred Werner, 68093 Mulhouse, France;1. Department of Mechanical Engineering, Sejong University, Seoul 143-747, Republic of Korea;2. Energy System R&D Group, Korea Institute of Industrial Technology, Chonan 331-825, Republic of Korea;1. Institute of Refrigeration and Cryogenics, Shanghai Jiao Tong University, Shanghai 200240, China;2. Engineering Research Centre of Solar Power and Refrigeration, MOE, China;3. Merchant Marine College, Shanghai Maritime University, Shanghai 201306, China;1. Department of Chemical System Engineering, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya-shi, Aichi 464-8603, Japan;2. Faculty of Mechanical Engineering, Institute of Science and Technology, Kanazawa University, Kakuma-machi, Kanazawa-shi, Ishikawa 920-1192, Japan;1. Shenzhen Key Laboratory of Laser Engineering, Shenzhen University, Shenzhen 518060, PR China;2. School of Chemistry and Chemical Engineering, TaiShan Medical University, Taian 271016, PR China;3. Department of Physics, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, PR China |
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| Abstract: | The performance of thick aluminophosphate molecular sieve layers for heat exchanger applications is evaluated. The aluminophosphate AlPO-18 (AEI structure type code) molecular sieve sorbent is coated on aluminium supports prior the sorption measurements. Two AlPO-18 samples with different morphological appearance, i.e. nano-sized crystals with monomodal size distribution and micron-sized crystals of varying sizes, are used to prepare layers with thickness in the range of 80–750 μm. As a binder component, polyvinyl alcohol (PVOH) was utilized in order to prepare mechanically stable layers, which are mechanically stable over numerous measuring cycles. The sorption measurements are conducted under canonical conditions at 40 °C. The AlPO-18 layers showed decreased mass flows with increasing the thickness. Additionally, the layers comprising nanosized crystals showed higher equilibrium loadings and faster kinetics compared to films based on micron-sized crystals. Following the kinetic studies of pressure, temperature and heat flow, it can be concluded that the heat transport is the rate limiting mechanism for thick aluminophosphate layers. Importantly, the diffusion limitation plays a role only for relatively thin microporous aluminophosphate layers (<200 μm). Below this thickness complete heat transfer is achieved within 2 min which allows fast heat exchanger cycles. Thus, the application of microporous aluminophosphate layers for heat transformation and storage applications is considered possible. |
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