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Computational Thermal Sciences: An International Journal
ESCI SJR: 0.244 SNIP: 0.434 CiteScore™: 0.7

ISSN Print: 1940-2503
ISSN Online: 1940-2554

Computational Thermal Sciences: An International Journal

DOI: 10.1615/ComputThermalScien.2013006349
pages 97-106

ANALYSIS OF HEAT AND MASS TRANSFER IN THE ADSORBENT BED OF A THERMAL WAVE ADSORPTION COOLING CYCLE

Ahmet Çağlar
Department of Mechanical Engineering, Akdeniz University, 07058 Antalya, Turkey
Cemil Yamali
Department of Mechanical Engineering, Middle East Technical University, 06531 Ankara, Turkey

ABSTRACT

A coupled heat and mass transfer analysis of the adsorbent bed of a thermal wave adsorption cooling cycle is performed. The adsorbent bed is modeled two dimensionally. Governing equations for energy, mass, and momentum transfers are solved by Comsol Multiphysics simultaneously. Variations of temperature, pressure, amount adsorbed, equilibrium adsorption capacity, and mass transfer coefficient for a finless tube adsorbent bed are presented with multicolored plots. The desorption process is simulated in the model. Results show that the adsorbent bed reaches the maximum cycle temperature uniformly after 5000 s. Uniform pressure assumption can be used in the bed due to a small pressure gradient during the process. The amount adsorbed decreases from 26.1% to 8.89% in 5000 s. The temperature front progresses along the bed creating a thermal wave. The thermal wavelength needs to be short to enhance the bed effectiveness regenerating more heat between the beds of the thermal wave cycle. It can be concluded that a parametric study is recommended for a future work in order to investigate the effects of design and operational parameters on the dependent variables and thermal wavelength.


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