EFFICIENT CONDENSATION FOR ORGANIC RANKINE CYCLES
ORC plants can be used for electricity production in multiple applications. Their potential is tremendous for converting industrial waste heat and renewable energy sources into electricity (geothermal heat, solarthermal heat and biomass). The ORC concept is similar to a conventional Clausius-Rankine process. Instead of water, an organic working fluid is used, which offers high conversion efficiencies already at low temperatures. Commercial products are available in different load ranges and manufacturers can be found in countries all over the world. However, investment costs for this technology are still relatively high. Cheaper and more efficient concepts are therefore promising options for advantages on the market. The investment for the condenser in an ORC power plant is generally high. In order to reduce costs, or to maximize efficiency this new optimized condensation concept is doing the trick.
The invention can be combined with any heat exchanger applied as a condenser and is based on an optimized integration of this condenser into the plant. The de-superheating of the working medium operates continuously by means of an injection cooling; the condenser operates then entirely in the 2-phase region. The application of the measure leads either to a reduced condenser size or a reduced condensation pressure.
- The invention can be adapted in novel products by manufacturers or as a retrofit in existing plants
- Benefit: Higher electricity output and cheaper production costs/larger profit margin
- Market: For industrial waste heat in Germany: 65 PJ/a (T>150°C)
Proof of concept and simulations