What is Underground Heat Accumulator

The chapter discusses various phase-transition heat-accumulating materials. Their application in heat pumps and their use for heat supply are presented. Phase-transition heat-accumulating materials in heat pipes are also considered, various types of heat pipes are presented. The installation of heat storage with phase-transition materials is presented. Along with phase-transition heat-accumulating materials, the chapter considers thermochemical heat-accumulating material of photochemical reactions of energy storage. As an example of a thermochemical heat-accumulating material, a solar power plant for thermochemical energy storage is presented. A developed computer program for the description of thermochemical reactions allows examining chemical and thermochemical reactions in multicomponent reciprocal systems, which can be carried out in the course of the reciprocal multicomponent systems. The computer program allows identifying thermochemical reactions occurring in mutual multicomponent systems, regardless of component and dependent on temperature.