Optimization of adsorption isotherm types for desiccant air-conditioning applications

• Published in: Renewable Energy Vol. 121; pp. 441 - 450
• Main Authors: Sultan, Muhammad, Miyazaki, Takahiko, Koyama, Shigeru
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.06.2018; Elsevier BV
• Subjects: adsorbents; adsorption; Adsorption isotherms; Air-conditioning; Applications; Desiccants; drying; grinding; manufacturing; Optimization; renewable energy sources; rubber; sorption isotherms; temperature; tobacco; water vapor; Adsorption isotherms; Desiccants; Applications; Optimization; Air-conditioning
• ISSN: 0960-1481; 1879-0682
• DOI: 10.1016/j.renene.2018.01.045

The present study investigates five kinds of adsorbents for desiccant air-conditioning (DAC) applications. Each adsorbent yield distinctive water vapor adsorption isotherm that can be categorized as type-I, type-II, type-III, type-V, and type-linear on the basis of the International Union of Pure and Applied Chemistry (IUPAC) classification. Ideal DAC cycle is evaluated for the air-conditioning (AC) applications, and steady-state moisture cycled (MCSS) is estimated by means of adsorption isobars. Results showed that the adsorbent enabling type-linear adsorption isotherm gives maximum MCSS for industrial AC processes of matches manufacturing/drying/storage, rubber dipped goods storage and photo studio drying room. However, adsorbent enabling type-V adsorption isotherm is found the optimum adsorbent for tobacco stemming/stripping/softening and optical lenses grinding. For industrial AC process of dipped surgical articles; adsorbents enabling type-II, type-linear, and type-I adsorption isotherms are found the optimum choice at low (<68 °C), medium (68°C-87 °C), and high (>87 °C) regeneration temperatures, respectively. •Ideal temperature and humidity zones for various air-conditioning applications.•Adsorption modeling of five adsorbents enabling distinctive adsorption isotherms.•Optimization is made for IUPAC types of water vapor adsorption isotherms.•Different types of adsorption isotherms require different regeneration temperature.