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Vapor compression cycle Tevaporator = 65 0C Pcond = 9 barCondenser Heat out Evaporator Tcon denser Throttle valve R-134a Compressor Power in Pevap = 3.5 bar Heat in Motor Evaporator/Boiler Pevap = 19 bar Tevaporator = 4 0C Condenser Pcond = 4 bar Tcondenser = 10 0C Vapor Compression Cycle vs Organic Rankine Cycle for low temperature geothermal application = 36 0C Heat in R-134a Heat out Organic Rankine Cycle Figure 6. The vapor compression cycle at refrigeration temperature levels has pressures and power densities similar to the organic Rankine cycle at low geothermal heat resource temperature conditions One such application for utilizing an Organic Rankine cycle to recover power from a low-temperature geothermal heat source is the proposed ORC system for Chena Hot Springs in Alaska. The geothermal wells at Chena Hot Springs produce hot water of around 74 0C (165 0F). This temperature is in general too low for ORC duty. However, given the year-round availability of 3 0C (37 0F) river water ORC-operation with an 8% thermal efficiency is possible. Figure 7 shows the temperature entropy diagram of the cycle anf Figure 8 shows a picture of the unit with evaporator and condenser entering and leaving water temperatures. Figure 7. Temperature-entropy diagram of the proposed Chena Hot Springs ORC unit Pump Turbine Generator Power outPDF Image | Power Production from a Moderate Temp Geothermal Resource
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