Hybrid Compressed Air Energy System

The Hybrid Compressed Air Energy System generates electrical power from stored compressed air, at a temperature of $754 \mathrm{~K}(897 \mathrm{~F})$ and pressure of 49.1bar (712psia). The air properties are acquired via high speed four stage centrifugal impellers, driven by a permanent magnet machine, requiring 906 kW. Stored compressed air is reduced to 4.07bar (59 psia) to drive a radial turbine wheel, attached to a high- speed permanent magnet generator (PMG) to produce 403 kW. Residual turbine exhaust temperature from the turboalternator is then directed to an organic rankine-cycle (ORC) system that produces an additional 51 kW output power. This makes for a total of 454 kW output from the turbo-alternators. An additional energy system, using the initial stored compressed air energy, applies fired hydrogen fuel (via a combustor assembly) to the turbine stage inlet at pressure 4.07 bar (59 psia). This is considered the Hybrid Compressed Air Energy System. Introduction of fired hydrogen fuel increases the turbo-alternator turbine stage inlet temperature from $754 \mathrm{~K}(897 \mathrm{~F})$ to $1255 \mathrm{~K}(1800 \mathrm{~F})$. This is a like system to the prior described. However, with a much higher PMG output of 806 kW from the turbo-alternator. The residual turbine exhaust gas is directed to an ORC system that produces 343 kW. For a total of 1149 kW.