In other world for many countries investment on new technologies which are still under the experimental stage of marketing, is too risky. While the emerging of new generation of storage mediums, such as lithium based batteries is revolutionizing the world of renewable energy storage systems, many counties are still far behind in the growing market of storage technologies due to budget-related issues and hindering policies. The development of proper storage medium for renewable sources with high intermittency (such as solar or wind) is an essential steps towards the growth of green energy development and enabling them to compete with fossil fuel resources in the current market. In the future, the model will be used to identify favorable procedures for implementing, optimizing and controlling ice energy storage systems in nonresidential buildings with waste heat recovery capability. The Stefan problem is utilized to conduct the validation and, moreover, a comparison with 13 months of measured data shows good agreement. The storage at the University of Bayreuth acts as heat source for a heat pump and is regenerated by the cooling water network delivering the waste heat, which can also be used as a direct source for the heat pump. Therefore, for the first time, a detailed numerical model of such a system is developed, validated and compared to long term measured data of a 500 m³ setup.

In order to design, evaluate and optimize such systems, analysis of its behavior by means of variational calculations are essential, which requires an adaptable model that is thoroughly validated.

However, investigations of ice energy storage systems for nonresidential buildings to use waste heat instead of solar benefit are missing. Several studies examine the suitability for residential buildings in combination with solar thermal power. Ice energy storage systems, as interface between the time-shifted occurring heat and cold demand of nonresidential buildings, are a promising technology to use waste heat arising inside buildings.

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