Up to day, 70% of the gross electricity (~ 20000 TWh) is produced via fossil fuel; to reduce this share and abate CO2 emissions the energy system will face a dramatic change in the near future consisting in a significant introduction of intermittent renewable energy sources. The implementation of this step change will be possible only through efficient and economic grid-scale electrical energy ...

Abstract. The tooth surface friction effects and the resulting contact temperature are important factors for dynamic characteristics of a gear-rotor system in compressed air energy storage (CAES). Therefore, 3∘ freedom finite-element model is set up which lubrication state gear pair, friction, surface, backlash unbalanced excitation considered. coefficient calculated according to variation stat...

Energy storage is a key issue when integrating large amounts of intermittent and nondispatchable renewable energy sources into electric power systems. To be able to maintain the instantaneous power balance and to compensate for the influence of power fluctuations that might result from renewable sources, flexible capability for power control is needed. Therefore, sufficient energy storage with ...

In recent years, there has been an increase in the use of renewable energy resources, which led to need for large-scale Energy Storage units electric grid. Currently, Compressed Air (CAES) and Pumped Hydro (PHES) are main commercially available storage technologies. However, these technologies restricted geographically can require fossil fuel streams heat air. Thus, is a develop novel that do n...

When storing gas in a salt cavern, it occupies most of the excavated volume, but lower part cavern inevitably contains residual brine, contact with gas. The design hydrogen and compressed air storage caverns requires to have thermodynamic model able accurately predict both phase properties such as densities, equilibrium (gas solubility water content vapour phase). This work proposes parameteriz...