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Modelling of a waste heat driven silica gel-water adsorption cooling system: comparison with experimental results.

Author(s) : VERDE M., CORBERÁN J. M., BOER R. de, et al.

Summary

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. The single adsorbent bed consisted of a 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 modes. The first mode had no time delay between the switching of the outlet and inlet valves, so that there was no heat recovery. The second operation mode included a delay time in between the switching of the liquid circuit valves so that a part of the sensible heat contained in the liquid circuits is recovered, with the aim to increase the COP. The mathematical model was adapted to simulate the dynamic behaviour of the system under any of both operation modes. The model prediction showed very good agreement with experimental data. The heat recovery was found to have a strong positive effect on the system’s COP, and a slight positive effect on the cooling power. The validation of the mathematical model and the good results attained, show that the use of this kind of model is essential for the further development and optimisation of the operation of adsorption systems.

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Pages: 553-567

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Details

  • Original title: Modelling of a waste heat driven silica gel-water adsorption cooling system: comparison with experimental results.
  • Record ID : 30001253
  • Languages: English
  • Source: Sources/sinks Alternative to the Outside Air for Heat Pump and Air-conditioning Techniques (Alternative Sources - AS), Padua, Italy, April 5-7, 2011. / International Sorption Heat Pump Conference (ISHPC11), Padua, Italy, April 6-8, 2011.
  • Publication date: 2011/04/06

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