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Electricity – organic Rankine cycle (ORC) systems An ORC system works according to the same principles as a normal steam turbine. The main difference is that an organic fluid is used instead of water, and that waste heat is used to vapourize the fluid instead of a boiler. Commercially available systems can generate electricity from temperatures as low as 55°C (131°F). Example The graph shows a profitability analysis based on information from a supplier of organic Rankine cycle systems. The cycle converts waste heat to electricity with an efficiency of approximately 10%. In this case the ORC system converts approximately 7 MW (23.9 MMBtu/h) of waste heat into 0.7 MW of electricity, i.e. an annual production of 5,880 MWh. Opcon, Sweden Opcon develops and markets cutting-edge products for waste heat recovery. Opcon Sweden uses Alfa Laval heat exchangers in its organic Rankine cycle systems. The systems are used for generating electricity from waste heat with temperatures as low as 55oC (131oF). Figure 2.10 ORC system Payback period for an ORC system. The annual saving amounts to 5,880 MWh. For assumptions, see www. alfalaval.com/waste-heat-recovery. Pay back period (years) 9 8 7 6 5 4 3 2 1 0 0 20 40 60 80 100 120 Electricity price (EUR/MWh) 29PDF Image | Waste heat recovery Optimizing
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