Coupling system for electrical storage
Thermal coupling module combines electricity storage with heat supply.
Exhibitors
Location
Hall 11, Stand B06
Description
Batteries as intermediate storage units are essential for volatile renewable energy production. They store surplus energy and thus cover gaps in supply. Due to their high performance and efficiency (85 - 95 percent), lithium-ion batteries (LIB) are usually used for this purpose. The high flammability and limited service life of LIBs stand in the way of this.
In contrast, vanadium flow batteries (VFB) are non-flammable, promise a longer service life and a good economy of scale, making them popular despite higher investment costs and lower efficiency (65 - 75 percent). As LIBs have so far impressed with peak efficiency values, heat recovery has hardly been considered here. The use of waste heat has much more potential with VFBs.
A new type of heat transport system has been developed at KIT's battery technology centre that minimizes the disadvantage of low energy efficiency and energy density for VFBs and thus increases profitability. This so-called thermal coupling module (TKM) uses waste heat for heat recovery. The waste heat is generated in the electrolyte of the VFB and collects in the two tanks. A heat exchanger is embedded in each of the electrolytes to capture the heat there simply and efficiently. The thermal energy is then used in the closed system of the building technology to heat the building or to heat water. It is expected that this will increase the overall efficiency to around 85 percent. In addition to the original use of the VFB as an electrical storage unit, it also functions as a heat storage unit thanks to the TKM. For this purpose, heat is introduced into the storage tank by means of a heating element. This additional benefit increases the building's self-consumption rate, which leads to cost savings.
A demonstrator has been in full operation since fall 2023. KIT is looking for partners from the fields of building technology or energy storage to accompany the technology through to market maturity.
Contact
Karlsruher Institut für Technologie (KIT)
- Kaiserstr. 12
- 76131 Karlsruhe
- Germany
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