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Figure 10: Second-law efficiency at the primary heat exchanger inlet as a function of the oo turbine inlet temperature for geothermal resource temperature of (a) 110 C and (b) 160 C Based on the energy input to the cycle, the First- and Second-law efficiencies are represented in Fig. 11. At low turbine inlet temperatures, the basic ORCs have been more efficient than the regenerative ORCs. As the turbine inlet temperature increased, the regenerative ORC with an IHE became the most efficient whereas the simple ORC showed a poor performance. This could be attributed to the ability of the regenerative cycles to minimize the exergy loss (irreversibility) during the heat transfer process. The choice of the appropriate ORC for the conversion of low-to-moderate grade geothermal heat in the given range of temperatures and based on the energy input to the ORC, is highly reliant on the turbine inlet conditions required. Figure 11: (a) First- and (b) Second-law efficiency on heat transfer input to the ORC as a function of the turbine inlet temperature The cycle effectiveness, which measures both quantitatively and qualitatively the amount of available energy to be transferred from the geothermal resource to the organic working fluid is plotted in Fig. 12, as a function of the turbine inlet temperature. At high turbine inlet temperatures, the curves of the cycle effectiveness for the different ORC types are observed to flatten. Nevertheless, one could conclude that the ORC with IHE enabled maximum conversion of the available energy from the geothermal resource to the organic working fluid.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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