Organic Rankine Cycle (ORC) technology is modern and highly energy efficient. It allows electric
energy production from renewable sources like geothermal wells, biomass, Sun and waste heat
energy. Organic Rankine Cycle technology is based on Rankine cycle with high-molecular-mass
organic fluid. Key is in organic fluid which evaporates on significantly lower temperature and
pressure than water in classic Rankine cycle. This system is described in first part of study with accent
on biomass and geothermal ORC systems.