Effect of geometry and operational parameters on the dehumidification performance of a desiccant coated heat exchanger

Venegas, Tomas; Qu, Ming; Nawaz, Kashif; Wang, Lingshi

doi:10.1080/23744731.2022.2077595

Title: Effect of geometry and operational parameters on the dehumidification performance of a desiccant coated heat exchanger

Journal Article · 30 May 2022 · Science and Technology for the Built Environment

DOI: https://doi.org/10.1080/23744731.2022.2077595 · OSTI ID:1887659

Venegas, Tomas ^[1]; Qu, Ming ^[1];

^[2];

^[2]

Purdue Univ., West Lafayette, IN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Solid desiccant dehumidification systems are an alternative to vapor-compression-based air dehumidification systems. They use solid desiccant materials to adsorb air moisture in space cooling. DCHE can integrate the cooling component in the heat exchanger to achieve higher dehumidification capacity. Comprehensive numeric modeling would be necessary to assist in the design and operation of the DCHE under development to achieve maximum performance. Here, we provide the details of a heat and mass transfer model developed for this purpose. The model aims to cover a gap in existing models by independently modeling heat transfer on the solid desiccant, fin, and tube. The model results were compared with an experimental reference for validation. The air outlet humidity and temperature results for dehumidification and regeneration showed a deviation lower than 15% from the experiment. The validated model was used to perform a parametric study for a series of design and operating conditions. The parametric analysis showed that an increase of 25% in desiccant layer thickness and thermal contact resistance between solid elements reduces moisture removal by 9.1% and 1%, respectively. These results indicate the need to independently model the desiccant layer.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Energy Efficiency Office. Building Technologies Office

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1887659

Journal Information:: Science and Technology for the Built Environment, Journal Name: Science and Technology for the Built Environment Journal Issue: 6 Vol. 28; ISSN 2374-4731

Publisher:: Taylor & FrancisCopyright Statement

Country of Publication:: United States

Language:: English

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