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首页> 外文期刊>International Journal of Heat and Mass Transfer >Characterization of transport limitations in SAPO-34 adsorbent coatings for adsorption heat pumps
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Characterization of transport limitations in SAPO-34 adsorbent coatings for adsorption heat pumps

机译：吸附热泵的SAPO-34吸附剂涂层中传输限制的表征

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摘要

Adsorption heat pumps have become an increasingly viable technology to use waste heat or renewable thermal energy for heating and cooling. The power density of this emerging technology is limited by the rate of heat and/or mass transfer in the adsorption heat exchanger (AdHEX) which drives investment costs. This work presents an experimental analysis of the mass and heat transfer during water sorption on SAPO-34 coatings to determine the limiting transport mechanism in state-of-the-art AdHEX. Isochoric temperature swings were carried out and evaluated using a recently introduced method to determine the relative importance of heat and mass transport impedances. Coatings with thicknesses between 60 and 460 mu m were investigated and in all cases the sorption dynamics were limited by mass transport. Ragone plots were used to characterize the power and energy trade-off during thermal cycling of SAPO-34 in water vapor to identify the pareto-optimal cycle time for a specific coating thickness. With the knowledge of the rate-limiting mechanism, the overall transport rates of adsorbent coatings can systematically be improved to enhance transport rates in next-generation AdHEX. (C) 2018 Elsevier Ltd. All rights reserved.
机译：吸附式热泵已成为使用废热或可再生热能进行加热和冷却的越来越可行的技术。这项新兴技术的功率密度受到吸附式热交换器（AdHEX）中的热量和/或质量传递速率的限制，从而驱动了投资成本。这项工作提出了对SAPO-34涂料吸水期间质量和传热的实验分析，以确定最新型AdHEX的极限传输机理。使用最新引入的方法进行了等时温度波动，并进行了评估，以确定传热和传质阻抗的相对重要性。研究了厚度在60到460微米之间的涂层，在所有情况下，吸附动力学都受到质量迁移的限制。 Ragone图用于表征SAPO-34在水蒸气中的热循环过程中的功率和能量权衡，以确定特定涂层厚度的最佳循环时间。有了限速机制的知识，就可以系统地改善吸附剂涂层的总传输速率，以提高下一代AdHEX的传输速率。 （C）2018 Elsevier Ltd.保留所有权利。

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