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Thermochemical storage in an ammonia chemical heat pump using chloride salt impregnated into carbon fabrics as binding and thermal conducting materials.

Author(s) : TOUZAIN P.

Summary

A chemical heat pump (thermochemical transformer) based on a reversible solid-gas reaction will be attractive if the process can store high energy density and if the heating or cooling power is high enough. For that, the reactor must contain a maximum quantity of reactive mixture and the kinetics of the gas sorption (or desorption) reaction must be sufficiently fast. In the case of ammonia-metallic chloride salt reaction, the uses of a salt-binder mixture (carbon, exfoliated graphite, graphite intercalation compounds and intercalated or impregnated carbon fibres) enhanced energy and power performances of the system. Another solution was found: the use of impregnated carbon fabrics. Several carbon textiles from different kinds of fibre precursors (rayon, polyacrylonitrile) and treatments (high treatment temperature, surface activation, etc.) were tested. Their gas permeability and thermal conductivity were determined. Ammonia sorption kinetics, reaction advancement, cycle reversibility and other thermophysical properties were measured. The method based on the modelling of the reactor was also used to determine the thermal conductivity of the impregnated textiles.

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Pages: 2004-2

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Details

  • Original title: Thermochemical storage in an ammonia chemical heat pump using chloride salt impregnated into carbon fabrics as binding and thermal conducting materials.
  • Record ID : 2005-2804
  • Languages: English
  • Source: Natural Working Fluids 2004: 6th IIR-Gustav Lorentzen Conference
  • Publication date: 2004/08/01

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