TITLE:
Time-Temperature Charge Function of a High Dynamic Thermal Heat Storage with Phase Change Material
AUTHORS:
Johannes Goeke, Andreas Henne
KEYWORDS:
Thermal Storage, Phase Change Material (PCM), Plate Heat Exchanger, Dynamic Performance, Storage Charge Function
JOURNAL NAME:
Energy and Power Engineering,
Vol.7 No.2,
February
25,
2015
ABSTRACT: A thermal heat storage system with an energy content of 40 kWh and a temperature of 58°C will be presented. This storage system is suitable for supporting the use of renewable energies in buildings and for absorbing solar heat, heat from co-generation and heat pumps or electric heat from excess wind and solar power. The storage system is equipped with a plate heat exchanger that is so powerful that even with small temperature differences between the flow temperature and the storage temperature a high load dynamic is achieved. The storage system has a performance of 2.8 kW at 4 K and 10.6 kW at a temperature difference of 10 K. Thus, large performance variations in solar thermal systems or CHP plants can be buffered very well. Further a storage charge function Q(T, t) will be presented to characterize the performance of the storage.