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Adsorption analysis for theoretical modelling of silica gel desiccant wheels

conference contribution
posted on 06.12.2017, 00:00 by Ramadas Narayanan, W Saman, S White, M Goldsworthy
Desiccant evaporative cooling system is a potential environment-friendly alternative to conventional vapour compression chillers. A desiccant wheel is the heart of this heat driven cooling system and it uses a solid desiccant for dehumidification with silica gel being most widely used. The desiccant material is coated, impregnated or formed in a place on the supporting rotor structure. The matrix consists of multiple channels in the direction of axis of rotation of the wheel. Proper design of the wheel is very important for the successful operation of the system and theoretical models are very useful tool in predicting the performance and design optimization. One of the major difficulties in numerical modelling of the desiccant wheel is the lack of knowledge of adsorption equilibrium of porous medium.In this paper, adsorption equilibria of the silica gel is studied and the different theories existing to characterize the adsorption process and different equations for prediction of adsorption equilibria are compared and used in a theoretical model predicting the wheel performance. The results of the different models are compared with experimental data and conclusions are drawn.

History

Parent Title

EuroSun 2010 : International Conference on Solar Heating, Cooling and Buildings, 28 September - 1 October 2010, Graz, Austria.

Start Page

1

End Page

8

Number of Pages

8

Start Date

01/01/2010

ISBN-13

9783901425134

Location

Graz, Austria

Publisher

IEA-SHC

Place of Publication

Cedar, Mi

Peer Reviewed

No

Open Access

No

Era Eligible

No

Name of Conference

EuroSun : International Conference on Solar Heating, Cooling and Buildings

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