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Figure 12: Cycle effectiveness as a function of the turbine inlet temperature 4.3. Irreversibility analysis As illustrated by Fig. 13, the addition of an IHE to the binary cycle has substantially reduced the exergy destruction in the Evaporator-preheater, condenser and cooling system, by about 40-70%, 20-30% and 5-15% respectively. The cycle power output increased only marginally with the regenerative ORC by less than 5% for a given combination of the geothermal fluid, evaporator and condenser temperatures. Adding an OFOH to the binary cycle, on the other hand, resulted in a remarkable reduction of the exergy destruction in all individual components of the binary cycle, typically 80-90% for the Evaporator-preheater unit, 25-35% for both the condenser and cooling system, 20-30% for the turbine, and 10-20% for the pumping system. A significant reduction of 15-25% in cycle power output was, however, observed. The major drawback with the addition of an IHE or/and OFOH lies in the increase in rejection exergy destruction, 0-20% with the addition of an IHE alone, 20-35% while employing an OFOH and up to 40% for both IHE and OFOH added to the binary-cycle. o Figure13:VariationofFueldepletionratiowithTgeo,TEandTcrespectively(givenin C) From Fig. 13, a sensitivity analysis is discussed for a change in operating evaporation temperature, decrease in condensing temperature and variation in the temperature of the geofluid resource:PDF Image | THERMODYNAMIC ANALYSIS AND PERFORMANCE OPTIMIZATION OF ORGANIC RANKINE CYCLES FOR THE CONVERSION OF LOW-TO-MODERATE GRADE GEOTHERMAL HEAT
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