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ECN publication
Modelling of a waste heat driven silica gel/water adsorption cooling system comparison with experimental results
Verde, M.; Corberan, J.M.; Boer, R. de; Smeding, S.F.
Published by: Publication date:
ECN Efficiency & Infrastructure 6-5-2011
ECN report number: Document type:
ECN-M--11-060 Conference Paper
Number of pages: Full text:
14 Download PDF  

In this paper a mathematical model is developed to investigate the performance of a silica gel-water adsorption cooling system. The model is completely dynamic and it is able to calculate the sequential operation of a thermal compressor, evaporator and condenser. The thermal compressor comprises of two identical adsorbent beds operating out of phase in order to achieve a continuous cold production. A single adsorbent bed consisted of three plate-fin heat exchangers in which dry silica gel (Sorbil A) grains were accommodated between the fins. The model was validated by experimental data. The experimental tests were performed in a lab-scale adsorption chiller prototype specifically designed and realized to be driven by low grade waste heat (80-90°C) with a cooling source at 33°C for automobile air-conditioning purposes. The experimental tests were conducted using two different operation system configurations. In the first one, an auxiliary heat recovery circuit is included. In the second system configuration, the auxiliary heat recovery circuit is omitted. In both cases, the mathematical model was able to simulate the dynamic behaviour of the system. The model prediction showed very good agreement with experimental data. The validation of the mathematical model promotes the idea of it being able to simulate a variety of similar prototypes in the future. The heat recovery system was found to have a strong positive effect on the chiller’s COP, and a slight positive effect on the cooling power.

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