The Working Principle
ORC or Organic Rankine Cycle technology is based on the principle used in power plants: water is heated and evaporated into steam. The steam drives a turbine, which is connected to a generator to produce electricity. The same principle is held for ORC, but organic fluids or refrigerants are used instead of water.
The working principle of the machine is represented in the figure on the right. The cycle is started at the pump, which is pumping the refrigerant – the fluid of the internal circuit of the machine – to the evaporator. At the evaporator, the available waste heat is used to evaporate the refrigerant. The saturated gas at the outlet of the evaporator is sent to the expander. The expansion of the gas is delivering the work to drive the generator, resulting in the production of electricity. Supersaturated low pressure gas is leaving the expander to be condensed in the condenser. The fluid leaving the condenser will be pumped up again to restart the cycle. All refrigerants used by E-RATIONAL are non-toxic and non-flammable with a very low global warming and zero ozone depletion potential.
E-RATIONAL ORC TECHNOLOGY
E-RATIONAL ORCs are skid-mounted, modular, CE compliant machines with plug-and-play connections for convenient installation. E-RATIONAL has chosen to use, as far as possible, industrial grade standard components having proven qualities and reliability. Some of them are further optimized, utilizing our own expertise and extensive research results. The heart of the ORC unit is the E-RATIONAL single screw expander, directly connected to an asynchronous generator.
E-RATIONAL single screw expander
The design of the expander is in-house knowledge. The E-RATIONAL single screw expander has a low rotational speed (3000 or 3600RPM) causing low mechanical stress to the parts and resulting in a high robustness and reliability. Internally, the rotating part is provided with a thermo-hard polymer, preventing direct metal-metal contact. The part preserves its performance at part load, an advantage which is increasing the operating hours and produced amount of power on yearly basis.
Our machines are equipped with comprehensive and user-friendly software. The machine is controlled by a PLC to ensure maximized efficiency at all times. The operating panel, connected to the PLC, allows the operator to follow up the machine production, even by remote connection.