Expanders for ORC

The screw expanders are widely used for waste heat recovery and geothermal applications. Reciprocating piston expanders have been used for the waste heat recovery of internal combustion engine exhaust. Screw and reciprocating piston expanders can be used 

Biomass-Fueled Organic Rankine Cycle-Based Cogeneration System 251 comparison between various types of expanders used in the ORC-based 

Type Speed (rpm) Cost Capacity Advantages Disadvantages 

Radial-inflow turbine 8,00(T 0,000 High High med. Lightweight, mature technology, high efficiency High cost, low efficiency at off-design conditions, intolerable two phase 

Screw expander 6,000 Med. Med. mall Low rotating speed, high efficiency at off-design conditions, tolerable two pheise Difficult manufacturing, lubrication requirement 

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