Compact and lossless heat storage

15. October 2019


An international consortium headed by AEE INTEC from Gleisdorf, together with partners that include EDF (FR), Vaillant (G) and TNO (NL) among others, has developed a new type of heat storage battery. The heat storage system based on thermochemical materials, which has already been put into operation in Warsaw (PL), facilitates the cost effective, compact and lossless storage of seasonal heat in existing buildings. The secret lies in the modular design of the prismatic storage module, which allows the available volume in a building to be used up to 20% more effectively than with the current type of cylindrical modules used. Granulated potassium carbonate (K2CO3) is used as the heat storage medium, which ensures improvements in performance, stability and energy density.


AEE INTEC develops compact and lossless seasonal heat storage for buildings

The main goal of the EU project is the development and demonstration of a heat battery, i. e. a new type of heat storage system based on thermochemical materials (TCM), which enables economical, compact and lossless seasonal heat storage in existing buildings.

Development of the create system
The CREATE system is characterized by a modular prismatic memory module design that is optimized for compactness and enables the use of the available volume in a building to be up to 20% more effective than with currently used cylindrical modules. Granulated potassium carbonate (K2CO3) is used as the storage material. As part of the project, a complete system with three modules and a total of 1,250 liters of K2CO3 was built and evaluated experimentally.
So far, the project was about

  1. Improving storage materials such as performance, stability and energy density;
  2. Development and optimization of a prismatic shaped absorber container to improve stackability and space requirements;
  3. Development and optimization of inexpensive evaporators / condensers;
  4. Optimization of the overall system based on laboratory experiments and annual system simulations.

The CREATE concept is implemented in a typical European apartment. In order to demonstrate the applicability of the thermochemical storage system and its operation under real conditions and to receive user feedback at an early stage, the CREATE system is installed in an orphanage in Warsaw, Poland. The climate at the location is characterized by cold winters and warm summers. Commissioning in Poland took place in early 2019 and was carried out by AEE INTEC.

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