Experimental studies on seasonal heat storage based on stable supercooling of a sodium acetate water mixture

The investigations showed that the salt water mixture will supercool in a stable way if all salt hydrate crystals in the heat storage module are melted during the charge period, that a method to activate solidification of the supercooled salt water mixture using boiling CO2 in a small tank attached to the outer surface of the heat storage module is reliable, that the heat content of the heat storage module is as high as theoretically calculated, and that the durability of the heat storage module is good. The investigations also showed that the heat exchange capacity rate to and from the heat storage module is too low, and that heat transfer areas of the heat storage module are too small.