Thermal energy storage device - a system for storing of phases conversion enthalpy

摘要

The thermal accumulator comprises an assembly of substances having several change of state, particularly disodium phosphate with 12 water molecules, a tridimensional molecular structure stabilizer which forms tubular or network-like inclusion compounds, a crystallisation accelerator having a high cange of state temperature, such as tetrasodium diphosphate with 12 water molecules and a dispersing agent, such as sodium pyrophosphate. Mixtures of glucoside bond polysaccharides and //c-1,4-glucane are particularly appropriate as stabilizers. Furthermore, the accumulator may appropriately contain cross linking agents, such as methanol, ethanol and particularly formaldehyde as well as epitaxial inoculation crystals such as sodium thiosulfate crystals with 5 water molecules. The so defined thermal accumulator is advantageously obtained according to a process wherein the different components are subjected to ultrasonic waves of a frequency comprised between 30 and 60 Hz at a temperature comprised between 40 and 60`C. In order to extend the useful life of the accumulator, a bacteriostatic substance and a specific enzyme inhibitor may further by added.