Interesting, using Glauber Salt phase change to store heat.

http://www.allanstime.com/SolarHome/Eutectic_Salt/index.html

The different mixtures of Glauber's salts, for example, have about 50 to 80 cal./gram during the phase change. Water is 1 cal./gram/deg C. So if you cycle brick, for example, through about 5 degree Celsius change, you only have 1 cal./gram. In this case you have an advantage of 50 to 80 times the thermal storage with Glauber's salts as you do with brick.

hey slenzen, interesting article. Did not know it had to be a specific salt, or Glauber's salts. I thought as long as a definitive salinity level is reached you increase the energy storage/transfer.

Glauber's salts are used in Germany in herbal practice of naturopathy. In particular it is used for de-toxifying the body, ie. it is a colonic treatment. Just a side thought.

Yeah, I am surprised there isn't more info on this and more work in this area.