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Adsorption cycle modeling: Characterization and comparison of materials

: Nunez, T.; Henning, H.M.; Mittelbach, W.

Fulltext urn:nbn:de:0011-b-654973 (441 KByte PDF)
MD5 Fingerprint: 4fba09e382fd5defabc771f484500637
Created on: 25.7.2008

Schweigler, C. ; Bayerisches Zentrum für Angewandte Energieforschung -ZAE-:
International Sorption Heat Pump Conference 1999. Proceedings
Garching: ZAE Bayern, 1999
ISBN: 3-7846-1220-2
International Sorption Heat Pump Conference (ISHPC) <1999, München>
Conference Paper, Electronic Publication
Fraunhofer ISE ()
Energieeffiziente und solare Kühlung

The selection of the proper material for solid sorption heat transformation applications depends on the thermodynamic characteristics of the sorption pair. Knowing the thermodynamic properties of the material is essential for the development of new solid sorption devices. Due to the different operating conditions of each application (heat pump, refrigeration, heat storage) the optimal material pair may vary. Therefore, to ensure the right choice, first the thermodynamic characteristics are determined and parameterized with Dubinin’s theory of adsorption. It is shown that for the sorption pairs silica gel/water and zeolite/water this theory provides a suitable form of parameterization. In a second step, the potential of a material pair is analyzed only with Dubinin’s characteristic curve. A simple criteria based on the shape of the characteristic curve and on the operating conditions of the application proves to be very useful for a quick comparison of sorption pairs. The cycle performance of the chosen application is calculated in a third step in more detail. This calculation is based on a model which takes into account the equilibrium characteristics and the involved sensible heats in the actual operating conditions.