Heat storages based on shape-stable phase-transitional material

This paper presents the research results of new types of heat storages (HS) with shape-stable phase-transitional material (PTM), called unpackaged. The researches were aimed at defining serviceability and operational efficiency of the new types of the HS. In the unpackaged HS, unlike the traditional ones, a working medium does not demand hermetic encapsulation during phase transfers from solid state into liquid state and backwards. The description of the physical and chemical properties of the heat-accumulating composite materials based on the paraffin and the production technology of such kind of shape-stable PTM is presented. As the working medium the heat-accumulating composite material based on the paraffin A-OAM-50 (V-TAM-50) with melting temperature of 53 °C was applied. Four specimens of the HS were used during experimental investigations. Analysis of thermal tests of the specimens was performed; it showed the effectiveness of the new types of the HS in state-of-the-art technology.