Abstract
Theoretical investigations have shown that a solar heating system with a collector area of 36 m2 can fully cover the yearly heat demand of a low energy house in Denmark if the solar heating system is based on a 6000 l seasonal heat storage with sodium acetatate trihydrate (SAT) supercooling in a stable way. The heat storage is divided into a number of separate modules. A sandwich heat storage test module has been built with the phase change material (PCM) storage box in between two plate heat exchangers. The plate-heat-exchange at the top of the PCM storage box is used for discharge of the module while the plate-heat exchanger at the bottom is used for charge of the module. The test module has a length of approx. 2060 mm and a width of approx. 1330 mm. The height of the plate heat exchangers is 13 mm. Fluid flow in the plate heat exchanger is regulated by a number of parallel baffles.
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