Abstract
A thermal energy storage unit employing lithium fluoride has been built to supply heat to a Stirling engine. The heat transport from the electric heating elements to the heat storage unit and from the latter to the heat sink is affected by the evaporation and condensation of sodium. The liquid sodium is transported with the aid of capillary structures, so that the system of heat transfer has the characteristics of a heat pipe. All the experiments were conducted with lithium fluoride as the heat-accumulation material. Much cheaper materials with practically the same properties are now available [1,2]. The experience gained with the storage unit built combined with later developments in the heat-pipe field and in the use of anti-corrosion inhibitors for the salt, have led to more sophisticated designs, which are described.
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