Investigating ad/desorption kinetics of SAPO-34/graphite filled coatings by T-LTJ for energy-efficient sorption application

IF 6.9 2区工程技术 Q2 ENERGY & FUELS

Applied Thermal Engineering Pub Date : 2025-10-04 DOI:10.1016/j.applthermaleng.2025.128631

Davide Palamara , Edoardo Proverbio , Andrea Frazzica , Luigi Calabrese

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Abstract

This study assesses the performance of coated heat exchangers in order to favor heat and mass transfer for adsorption-based thermal energy storage and conversion systems. The investigation focused on the kinetic behavior of a novel composite coating composed of a sulfonated polyether ether ketone (S-PEEK) matrix, SAPO-34 zeolite, and exfoliated graphite (EG) as a conductive filler, applied on aluminum heat exchangers. Using the Thermal Large Temperature Jump (T-LTJ) method, a comparative kinetic analysis of a coating with 90 wt% zeolite and 5 wt% graphite filler was performed against a baseline zeolite-only coating under real operating conditions. Results show that EG significantly enhances adsorption kinetics, reducing characteristic times by 21 %–31 % and increasing maximum specific power by 24 %–29 %. This improvement is attributed to enhanced heat transfer due to EG’s thermal conductivity. Desorption kinetics showed marginal improvements, likely due to the inherent efficiency of the zeolite-only coating. The study confirms that even small amounts of EG effectively boost heat transfer and overall coating performance, especially during adsorption. This highlights the potential of EG for optimizing adsorbent coatings in adsorption heat transforming applications.

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用T-LTJ研究SAPO-34/石墨填充涂层的吸附/解吸动力学及其节能吸附应用

本研究评估了涂层热交换器的性能，以支持基于吸附的热能储存和转换系统的传热和传质。研究了以磺化聚醚醚酮（S-PEEK）为基体、SAPO-34沸石和剥离石墨（EG）为导电填料的新型复合涂层在铝热交换器上的动力学行为。采用热大温度跳变（T-LTJ）方法，在实际操作条件下，对含有90%沸石和5%石墨填料的涂层与仅含有沸石的基线涂层进行了对比动力学分析。结果表明，EG显著提高了吸附动力学，特征次数减少了21% ~ 31%，最大比功率提高了24% ~ 29%。这种改进是由于EG的导热性增强了传热。解吸动力学表现出微小的改善，可能是由于纯沸石涂层的固有效率。该研究证实，即使少量的EG也能有效地提高传热和整体涂层性能，特别是在吸附过程中。这突出了EG在优化吸附剂涂层在吸附热转化应用中的潜力。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Applied Thermal Engineering 工程技术-工程：机械

CiteScore

11.30

自引率

15.60%

发文量

1474

审稿时长

57 days

期刊介绍： Applied Thermal Engineering disseminates novel research related to the design, development and demonstration of components, devices, equipment, technologies and systems involving thermal processes for the production, storage, utilization and conservation of energy, with a focus on engineering application. The journal publishes high-quality and high-impact Original Research Articles, Review Articles, Short Communications and Letters to the Editor on cutting-edge innovations in research, and recent advances or issues of interest to the thermal engineering community.