A turbine based domestic micro ORC system

• DOI: 10.1016/j.egypro.2017.09.112
• Publication Date: 2017-09-12T11:18:06Z
• Authors: Piotr Klonowicz; Łukasz Witanowski; Łukasz Jędrzejewski; Tomasz Suchocki; Piotr Lampart
• Keywords: Thermal efficiency

The paper presents an analysis of a turbine based micro ORC system for domestic biomass boiler. assumed nominal boiler capacity is in the range between 15 kW and 20 kW. Such small thermal output particularly difficult from point view power generation. One major issues economic aspect system. In general, systems are relatively more expensive. Another problem poor electrical efficiency which results efficiencies individual components such as expansion unit feed pump. Various working fluids considered also various methods evaporation oil loop, pressurized water loop direct evaporation. examined. main focused laid on design. Due to low volume flow rates rotational speeds must be high, even exceeding 100 krpm some designs. types considered, however, preferred choice partially admitted highly loaded impulse stage. Very lead blade channels that manufacture, throats supersonic nozzles can problematic. Manufacturing difficulties impose worse tolerances bigger relative clearances edge thicknesses have negative impact efficiency. High speed require appropriate bearing reliable and, system, simple. Gas bearings (e.g. foil bearings) or ceramic seem fulfill these requirements.