Phase Change Materials (PCM) oscillate between solid and liquid phase within a certain temperature range (Mansfield). When the environment’s temperature is higher than that of the PCM, heat transfers from the surroundings to the material, which creates a cooling effect and changes PCM’s state from solid to liquid. When the environment’s temperature is lower than that of the PCM, heat transfers from the PCM to the surroundings, generating a warming effect and PCM changes back to its solid state.
savEnrg PCM22P is an inorganic salt hydrate which freezes at temperatures below +16 degree C and melts at temperatures above +27 degree C. It's latent heat storage capacity is 185KJ/Kg and is tested for 3000 cycles. About 20Kg of this material is needed to store 1KW of thermal energy.