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Characterization methodology of mass transfer within porous absorbers of solid-gas sorption heat pump.

Number: 0614

Author(s) : PUBILL A., STITOU D.

Summary

Solid-gas sorption heat pumps using ammonia present a clear advantage for heat and/or cold storage applications using an intermittent thermal source. Their operating principle allows for three distinct phases: a regeneration phase where the system is thermally recharged, an unlimited storage phase and an on demand combined cold and heat production phase. The basic system is composed of an evaporator/condenser and a reactor acting as a gaseous ammonia absorber.  The key element of this sorption technology lies in the reactor where a porous reactive composite is responsible for the sorption and desorption of the gaseous ammonia via a solid/gas reversible reaction. The quality of the heat transfer and the reactive gas diffusion in the porous material substantially impacts the power performance of the whole system. In particular, the gas diffusion quality is crucial when the reactor operates at low pressure, that is, for deep-freezing refrigeration. The present study has been inspired by Brace's pressure pulse decay well-known approach (Brace et al., 1968). It focuses on an original dynamic characterization methodology specifically developed for radial diffusion trough porous cylindrical blocks. An experimental test bench enables the measurement of the permeability of sample materials ranging from 10-13 to 10-15 m2, with either a static or a dynamic method. Such a characterization methodology and experimental equipment will ultimately allow to define the most relevant implementation of the reactive compound in a reactor for a required power performance.

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Pages: 8 p.

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Details

  • Original title: Characterization methodology of mass transfer within porous absorbers of solid-gas sorption heat pump.
  • Record ID : 30031638
  • Languages: English
  • Subject: Technology
  • Source: Proceedings of the 26th IIR International Congress of Refrigeration: Paris , France, August 21-25, 2023.
  • Publication date: 2023/08/21
  • DOI: http://dx.doi.org/10.18462/iir.icr.2023.0614

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