Realistic minimum desorption temperatures and compressor sizing for activated carbon + HFC 134a adsorption coolers

Srinivasan, Kandadai and Dutta, Pradip and Saha, Bidyut Baran and Ng, Kim Choon and Prasad, Madhu (2013) Realistic minimum desorption temperatures and compressor sizing for activated carbon + HFC 134a adsorption coolers. In: APPLIED THERMAL ENGINEERING, 51 (1-2). pp. 551-559.

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Abstract

A low thermal diffusivity of adsorption beds induces a large thermal gradient across cylindrical adsorbers used in adsorption cooling cycles. This reduces the concentration difference across which a thermal compressor operates. Slow adsorption kinetics in conjunction with the void volume effect further diminishes throughputs from those adsorption thermal compressors. The problem can be partially alleviated by increasing the desorption temperatures. The theme of this paper is the determination the minimum desorption temperature required for a given set of evaporating/condensing temperatures for an activated carbon + HFC 134a adsorption cooler. The calculation scheme is validated from experimental data. Results from a parametric analysis covering a range of evaporating/condensing/desorption temperatures are presented. It is found that the overall uptake efficiency and Carnot COP characterize these bounds. A design methodology for adsorber sizing is evolved. (c) 2012 Elsevier Ltd. All rights reserved.

Item Type:	Journal Article
Publication:	APPLIED THERMAL ENGINEERING
Publisher:	PERGAMON-ELSEVIER SCIENCE LTD
Additional Information:	Copyright for this article belongs to the PERGAMON-ELSEVIER SCIENCE LTD, ENGLAND.
Keywords:	Activated carbon; Adsorption system; Compression; Efficiency; R134a
Department/Centre:	Division of Mechanical Sciences > Mechanical Engineering
Date Deposited:	17 Apr 2013 05:47
Last Modified:	17 Apr 2013 05:47
URI:	http://eprints.iisc.ac.in/id/eprint/46390

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