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Entropy 2018, 20(8), 595; https://doi.org/10.3390/e20080595

Thermodynamic Analysis of Irreversible Desiccant Systems

1
Interdisciplinary Institute for Thermal Energy Conversion Engineering and Mathematics, Waseda University, Shinjuku-ku, Tokyo 169-8555, Japan
2
DIEF—Department of Industrial Engineering of Florence, University of Florence, Via Santa Marta 3, 50139 Firenze, Italy
*
Author to whom correspondence should be addressed.
Received: 8 June 2018 / Revised: 2 August 2018 / Accepted: 6 August 2018 / Published: 9 August 2018
(This article belongs to the Special Issue Entropy: From Physics to Information Sciences and Geometry)
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Abstract

A new general thermodynamic mapping of desiccant systems’ performance is conducted to estimate the potentiality and determine the proper application field of the technology. This targets certain room conditions and given outdoor temperature and humidity prior to the selection of the specific desiccant material and technical details of the system configuration. This allows the choice of the operative state of the system to be independent from the limitations of the specific design and working fluid. An expression of the entropy balance suitable for describing the operability of a desiccant system at steady state is obtained by applying a control volume approach, defining sensible and latent effectiveness parameters, and assuming ideal gas behaviour of the air-vapour mixture. This formulation, together with mass and energy balances, is used to conduct a general screening of the system performance. The theoretical advantage and limitation of desiccant dehumidification air conditioning, maximum efficiency for given conditions constraints, least irreversible configuration for a given operative target, and characteristics of the system for a target efficiency can be obtained from this thermodynamic mapping. Once the thermo-physical properties and the thermodynamic equilibrium relationship of the liquid desiccant mixture or solid coating material are known, this method can be applied to a specific technical case to select the most appropriate working medium and guide the specific system design to achieve the target performance. View Full-Text
Keywords: thermodynamic mapping; desiccant systems; entropy balance thermodynamic mapping; desiccant systems; entropy balance
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Giannetti, N.; Yamaguchi, S.; Rocchetti, A.; Saito, K. Thermodynamic Analysis of Irreversible Desiccant Systems. Entropy 2018, 20, 595.

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