Thermal issues of compressed air energy storage

Why is exergy analysis of compressed air energy storage important?

Comprehensive exergy analysis of the dynamic process of compressed air energy storage system with low-temperature thermal energy storage Unsteady characteristics of compressed air energy storage (CAES) systems are critical for optimal system design and operation control.

How does pressure affect thermal energy storage?

In all, the utilization of heat in the thermal energy storage can be affected by pressures in the air storage chamber with the power efficiency unchanged. Appropriate selection of pL and pH can not only ensure power efficiency, but store considerable heat energy for other applications. 5. Conclusions

Does air storage chamber temperature affect thermal efficiency of AA-CAES system?

Results show that with power efficiency unchanged, variation of temperature in air storage chamber has no effect on the utilization of heat in TES, and appropriate selection of pressure limits can regulate the utilization of heat and work, which may raise the power efficiency and the thermal efficiency of AA-CAES system at the same time.

What is compressed air energy storage?

Compressed air energy storage (CAES) is one of the many energy storage options that can store electric energy in the form of potential energy (compressed air) and can be deployed near central power plants or distribution centers. In response to demand, the stored energy can be discharged by expanding the stored air with a turboexpander generator.

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 happens when a compressed air storage tank is full?

During energy storage process, when the compressed air storage tank is about to be full, by converting an amount of compressed air to liquid air can still draw electrical energy from the grid. During energy release process, when the compressed air storage tank is to be empty, the liquid air storage tank provides air.