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Influence of adsorption cycle limitations on the system performance = Influence des limites du cycle à adsorption sur la performance du système
Cerkvenik, Boštjan ; Poredoš, Alojz ; Ziegler, Felix
The economics of heat driven heat pumps are governed by two thermodynamic quantities: the performance on the one hand and the size of the heat exchangers, which is required to obtain this ...performance, on the other hand. The aim of this paper is to discuss the influence of the main features of adsorption cycles in comparison to absorption cycles on these quantities. In our case, a Zeolite UCC16x40-type 13X has been taken as the adsorbent. The analysis has already been used for absorption heat pumps. In the case of adsorption and other solid sorption chillers, additional limitations appear, e.g. identical design of all adsorbers, incomplete heat recovery between adsorbers, cycling of inert mass, etc., which all contribute to a lowering of the system performance or to an increase of the exchange area required. To show the basic differences between absorption and adsorption cycle optimization, and also to show the impact of physical or technical limitations on the adsorption chiller performance, a detailed analysis has been performed. It is confirmed that it is mainly the lack of a solution heat exchanger which lowers the adsorption system COP and not physical properties of the working pair, so there is still a lot of room for improvement in the solid-sorption of heat pumps.
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