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Journal of Solar Energy
Volume 2016 (2016), Article ID 9075349, 8 pages
Research Article

PCM Heat Storage Charged with a Double-Reflector Solar System

1Department of Physics, Eduardo Mondlane University, Avenida Julius Nyerere 3455, P.O. Box 257, Maputo, Mozambique
2Department of Physics, Uppsala University, Uppsala, Sweden
3Department of Physics, Norwegian University of Science and Technology (NTNU), Trondheim, Norway
4Department of Energy and Process Engineering, Norwegian University of Science and Technology (NTNU), Kolbjørn Hejes vei 1B, 7491 Trondheim, Norway

Received 23 March 2016; Accepted 15 June 2016

Academic Editor: Charles M. Drain

Copyright © 2016 Amos Veremachi et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


A “Solar Salt” (NaNO3–KNO3 60 : 40 molar mixture) latent heat storage has been charged by direct solar illumination. Solar Salt as a Phase Change Material (PCM) can be an attractive small scale heat storage solution, as the melting temperature of about 220°C can be suitable for cooking purposes. The tests were made with a double-reflector setup. In this setup a secondary reflector positioned above the focal point of the primary reflector directs the rays onto a heat storage positioned below a hole in the primary reflector. The reflectors are tracking the sun, but the storage is stationary. The direct illumination of the absorber top plate during the tracking of the sun melted the salt in the storage through conducting fins. This is a system where portable heat batteries can be charged, during sunshine hours, and then provide heat for cooking during evening times.