Dry Screw vs.
Outline of both systems
Advantages of Dry Screw
High Performance Response
Dry Screw Compressor/expander can adjust input/output power with extreme flexibility by wide adaptability of rotational speed. It realizes a high-performance response to the requirement signal (charge/discharge).
In contrast, Turbo compressor does not fit as Renewable Energy Storage as they do not have flexibility to requirement signal.
Achieved Highest Pressure as Dry Screw Type
KOBELCO has successfully upgraded Dry Screw Compressor capable to be used with high pressure (653psi+), which will fit as an alternative of GT-CAES (Turbo compressor is standard) and realize an emission-free Energy Storage system.
One Screw Type machine can be used for Both Directions
KOBELCO DRY SCREW machine can be used for both directions, Compressor and Expander, which brings additional cost advantages. In contrast, GT-CAES (Turbo) type requires separate machines for compression and generation (either an expander or gas turbine).