Energy storage mechanical design thermal management

What are thermo-mechanical energy storage systems?

Thermo-mechanical energy storage systems are based on transformations between mechanical and thermal energy. Internally, thermal energy storage might be combined with mechanical energy storage. The storage components are combined with standard components such as heat exchangers, compressors or turbines.

Are thermo-mechanical systems a promising option for future Bulk energy storage?

Due to the recent progress in thermal energy storage technology, the large variety of concurrent concepts and the application of mostly conventional components, thermo-mechanical systems are considered as a promising option for future bulk energy storage.

How does a thermal energy storage system work?

The steam exiting the compressor is de-superheated, condensed and subcooled in the thermal storage system. During discharging, the thermal energy provided by the thermal energy storage system is used to operate a conventional medium temperature Rankine cycle. This approach was already proposed in the early descriptions of the PTES concept .

What is a two-stage thermal energy storage system?

A two-stage cycle is applied; the maximum pressure at the exit of the compressor is 82 bar, the maximum temperature is 462 °C. Two underground packed bed thermal energy storage units are operated at different pressure levels. The calculated roundtrip efficiency of this concept is 67.5%. The main characteristics of this system are given in Table 2.

Can thermo-mechanical energy storage concepts be integrated into thermal power plants?

Thermo-mechanical energy storage concepts may be the basis for independent storage plants; some of these concepts may also be integrated into thermal power plants. Integration helps to reduce costs by the dual use of components and helps to ensure supply security.

Can thermal energy storage be combined with mechanical energy storage?

Internally, thermal energy storage might be combined with mechanical energy storage. The storage components are combined with standard components such as heat exchangers, compressors or turbines. Some of these components require modifications, other are identical to components used in the process industry or in power plants.