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Cooling power determination by measuring the adsorbed vapor mass variations: comparison of mass adsorption cooling power correlation and external fluid loop power measurement.

Number: AD-CO-1092

Author(s) : GANTENBEIN P., DAGUENET-FRICK X., BONT F., et al.

Summary

The cooling power of a closed solid sorbent – vapor/liquid sorbate system is depending on the thermo-physical properties of the material combination sorbent – sorbate and of the external heat sources and sinks. Beside the afore mentioned conditions, the geometrical structure of the sorbent - vapor flow configuration and the heat transfer in both the sorbent arrangement to a heat exchanger and in the liquid sorbate container are dominating power determining design requirements. A single vacuum chamber adsorption-desorption facility was designed and setup. The water vapor uptake in 7.5 kg of spherical shaped Fuji RD Silica Gel particles was measured in the adsorption-desorption fixed-bed hanging module by means of a beam balance. Considering the heat of evaporation, the cooling power was calculated and reached 1.5 kW or higher values. The comparison with the external fluid loop power – the evaporator power – showed good agreement. From another side, comparing the vapor mass uptake in this adsorption-desorption module with data from a single particle experiment shows a relative lower time resolved mass increase in the fixed bed. On the other hand a far longer possible adsorption (and desorption) cycle time – with a decreasing cooling power – is possible. This behavior can be explained by a pressure drop in the vapor flowing through the fixed bed and thus a longer time until saturation of all the sorbent particles – in the center of the module. With this setup the adsorption-desorption module – and the evaporatorcondenser unit – can be characterized and optimized.

Details

  • Original title: Cooling power determination by measuring the adsorbed vapor mass variations: comparison of mass adsorption cooling power correlation and external fluid loop power measurement.
  • Record ID : 30022805
  • Languages: English
  • Source: International sorption heat pump conference, ISHPC 2017, Tokyo august 7-10.
  • Publication date: 2017/08/07

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