Abstract
D-mannitol has been selected as phase change material for direct steam generation. Since its stability in air cannot be assured, according to previous studies, this paper deals with the behavior of this material under inert atmosphere. Using a device, specifically designed for this study at the Plataforma Solar de Almería, the thermal behavior of D-mannitol when cycled between 100°C and 190°C under inert atmosphere, up to 50 times, as well as its loss in mass when heated during a certain time in inert atmosphere is presented. After being cycled, a change in the melting temperature interval as well as in the supercooling range of temperatures is stated. In addition to this, a change in color and consistency after having a sample at 180°C for a determined period of time prove the degradation and hence then non-feasibility of the D-mannitol as PCM.
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