HEAT STORAGE USING THE LATENT HEAT OF FUSION OF A SUBSTANCE ADSORBED ON A POROUS MATRIX
Heat storage using the latent heat of fusion of a substance absorbed on a porous matrix The objective of the present work was to show the feasibility and the advantages of a new and original storage process, using the latent heat of fusion of a material (paraffine) absorbed on porous particles (activated carbon). A model was also presented to illustrate the process in order to understand the thermal behaviour, predict the performance and optimize the design and operation. The results are positive with regard to thermal efficiency. The average storage capacity of the present process is comparable to that of water tanks, or superior in a certain operating range, and considerably superior to that of pebble beds. Its dynamic behaviour is very close to that of a perfect stratified tank: the stratification in the tank is sharp and the reproducibility of the temperature profiles during successive cycles of charge and discharge is very good. Moreover, the pressure drop is acceptable. Very high internal heat transfer efficiency is also obtained when either water or air is used as heat transfer fluid. It has been shown that the complexity of the thermal behaviour of a storage system using latent heat is mainly due to the non-linearity of the enthalpy versus temperature relation. A simple model has been developed to explain the main features of this behaviour, using this enthalpy curve. Studies in sensible heat storage give the additional parameters that must be incorporated in a more elaborate model.
Bibliographic Reference: EUR 8167 FR (1983) MF, 180 P., BFR 240, BLOW-UP COPY BFR 900, EUROFFICE, LUXEMBOURG, POB 1003
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Record Number: 1989122058000 / Last updated on: 1987-01-01
Available languages: fr