Performance evaluation of a two-stage air-cooled silica gel + water adsorption cooling system: Effect of key operational parameters

Madhuri, MR and Srinivasan, K and Dutta, P (2023) Performance evaluation of a two-stage air-cooled silica gel + water adsorption cooling system: Effect of key operational parameters. In: Applied Thermal Engineering, 232 .

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Abstract

The primary objective of this work is to extract some design criteria of the upper-stage adsorber bed in a two-stage two-bed adsorption cooling system. The second objective is to experimentally investigate the effects of air-cooled heat sink, and hot water source temperatures on the chiller performance. These studies are important as the adsorber bed design together with the input operational parameters determines the chiller performance. It was observed that the performance indicators, namely, cooling capacity (CC) and coefficient of performance (COP) exhibit opposite trends with the reduction in the temperature of the sink where heat of adsorption is rejected. The performance parameters are evaluated for heat source temperatures in the range of 75–85 °C against different half-cycle times. The CC and COP are found to vary between 148 - 324 W and 0.09–0.11 respectively depending on the heat source temperature and half cycle time. The novelty of the present work is in providing experimental evidence on influence of heat source temperatures on two-stage adsorption chillers when air cooling is adopted for all heat rejections to the ambient. Another key finding is that the upper stage performance is critical because of smaller volume and lower heat transfer area available in it compounded by higher uptake differences across which it operates.

Item Type:	Journal Article
Publication:	Applied Thermal Engineering
Publisher:	Elsevier Ltd
Additional Information:	The copyright for this article belongs to Elsevier Ltd.
Keywords:	Coefficient of performance; Cooling capacity; Silica gel + water adsorption cooling; Two-stage system
Department/Centre:	Division of Interdisciplinary Sciences > Interdisciplinary Centre for Energy Research Division of Mechanical Sciences > Mechanical Engineering
Date Deposited:	26 Jul 2023 06:45
Last Modified:	26 Jul 2023 06:45
URI:	https://eprints.iisc.ac.in/id/eprint/82554

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