What is thermochemical heat storage?

Thermochemical heat storage is a technology under development with potentially high-energy densities. The binding energy of a working pair, for example, a hydrating salt and water, is used for thermal energy storage in different variants (liquid/solid, open/closed) with strong technological links to adsorption and absorption chillers.

What is a sensible heat storage system?

Due to being less expensive than LH-TES and TCS systems, sensible heat storage is suitable for both residential and industrial applications wherein hot water tanks were used. However, SH-TES requires the appropriate design of the systems as well as large volumes because of its low energy density.

How are sensible and latent thermal storage systems developed at Fraunhofer ISE?

Different sensible and latent thermal storage systems with different operation temperatures are developed at Fraunhofer ISE from the material to the system level. At the material level, the development of PCS, the degradation of PCMs, and the compatibility of fillers for sensible storages is addressed in current research projects.

How efficient is high temperature latent heat storage?

As the airflow increased, the heat exchanging rate increased. The efficiency during charging and discharging ranged from 71.0 % to 98.3 % and 69.0 %–90.2 %. High temperature latent heat storage has gained increasing attention owing to its potential in the integration of renewable energy sources.

What is a sensible thermal energy storage?

In terms of their discharging method, the power conversion process is crucial. In terms of design type, sensible thermal energy storage with solid storage material can be divided into packed bed and fixed structure (for non-packed bed) and distinguished on the basis of the storage material used.

What are the challenges of latent thermal energy storage?

One of the main challenges for latent thermal energy storages is the phase change itself which requires a separation of the storage medium and HTF. Furthermore, PCMs usually have a low thermal conductivity, which limits the heat transfer and power of the storage.