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ORC technology and implementation in different geological contexts

André-Charles Mintsa (Enogia) - ORC technology and implementation in different geological contexts The ORC or the Organic Rankine Cycle,is a thermodynamic cycle, allowing heat to electricity conversion. The name Rankine cycle come from William Rankine, a Scottish engineer who developed the theory of steam Machine. The ORC vaporize an organic fluid having a molecular mass higher than water, and a liquid-vapor phase change occurring at lower temperature than water. This machine works based on these 2 principles. The ORC can work at low temperature, between 30° to 300°C. ORC applications are broad and depends on the organic fluid used in the cycle. Some examples of heat sources that can be used are industrial waste, biomass combustion, geothermal heat… The purpose of this course is to give basic knowledge of ORC technology. At the end of this course, the attendee will know what an ORC is, how to perform an ORC sizing, the pros and cons of this technology. ORC application in geothermal context will be emphasized. Course plan 1. Introduction 2. The Story of the ORC 3. How does an ORC work ? a. Principle of the ORC b. How to select the working Fluid ? c. What is a Regenerative Cycle ? d. What is an Expander machine ? 4. How to design an ORC ? 5. Heat recovery in the geothermal context