Abstract
A rapid experimental procedure of interest in determining the suitability of salt hydrates to be used in chemical heat pumping is described. Thermogravimetry under controlled water vapour pressure is utilized as the key diagnostic method. The test procedure relies largely on two critical tests: a cycling and an inhibition test. The former gives information on the stoichiometric reversibility and hysteresis between the dehydration and rehydration branches, while the inhibition test yields more quantitative information about the extent of inhibition. The latter represents a source of irreversibility inherent to the salt hydrate system. The test procedure is discussed and illustrated using four different salt hydrates: barium chloride, sodium sulphide, magnesium chloride and lithium hydroxide.
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