Patent ID: 9618276
Date: 2017-04-11
CPC Classifications: F24D,F28D,Y02E

Claim:
1. A process for storing thermal energy by chemical reaction wherein a flow of heat transfer gas is circulated through a layer of a first hygroscopic salt A then through a layer of a second hygroscopic salt B, the gas being reactive with the salts A and B, the thermodynamic equilibrium curve of the salt A being located further to the left than that of the second salt B in a pressure-temperature phase diagram, the circulation of the flow of gas giving rise to a dehydration or hydration reaction both of the first salt A and of the second salt B; wherein the first salt A is selected from the double sulfate of aluminum and potassium (KA1(S04)2), strontium hydroxide Sr(OH)2, sodium sulfide Na2S and ammonium aluminum sulfate NH4A1(S04)2, while the second salt B is respectively selected from strontium bromide (SrBr2), sodium sulfide (Na2S), and nickel sulfate (NiS04).