Calculation of cycle efficiency of compressed air energy storage system

How efficient are compressed air energy storage systems?

Compressed air energy storage (CAES) systems stand out for their high efficiency and affinity with the environment. In the present article a thermodynamic analysis of an operating cycle of a small scale CAES system with constant volume reservoir is conducted, taking into account three different operating conditions for compressed air storage walls.

How do compressed air storage systems use energy?

The modeled compressed air storage systems use both electrical energy (to compress air and possibly to generate hydrogen) and heating energy provided by natural gas (only conventional CAES). We use three metrics to compare their energy use: heat rate, work ratio, and roundtrip exergy efficiency (storage efficiency).

What is compressed air energy storage (CAES)?

Among the different energy storage methods, Compressed Air Energy Storage (CAES) is one of the most promising, being intensively studied nowadays due to its high efficiency and environmental affinity . A CAES power plant is basically a modification of a conventional gas turbine power plant.

What is a conventional compressed air energy storage system?

Schematic of a generic conventional compressed air energy storage (CAES) system. The prospects for the conventional CAES technology are poor in low-carbon grids [2,6–8]. Fossil fuel (typically natural gas) combustion is needed to provide heat to prevent freezing of the moisture present in the expanding air .

How efficient is compressed air energy storage in caverns?

It was found that an A-CAES efficiency in the range 60-70% is achievable when the TES system operates with a storage efficiency above 90%.. An accurate dynamic simulation model for compressed air energy storage (CAES) inside caverns has been developed. Huntorf gas turbine plant is taken as the case study to validate the model.

What is a dynamic simulation model for compressed air energy storage?

An accurate dynamic simulation model for compressed air energy storage (CAES) inside caverns has been developed. Huntorf gas turbine plant is taken as the case study to validate the model. Accurate dynamic modeling of CAES involves formulating both the mass and energy balance inside the storage..