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• • • For a given geothermal fluid and condensing temperatures, an increment of 10oC in the evaporating temperature resulted to a substantial increase in the rejection exergy destruction, back to the exploitation reservoir, at approximately 16-27%, whereas the exergy destruction of both the evaporative and condensation processes decreased by 20-40% and 20-25% respectively. In addition, the ability to convert the total exergy input to useful work output also dropped by approximately 15%. For a given geothermal fluid and evaporating temperatures, a decrease in condensing temperature of 10oC yielded a decrease of roughly 71% in exergy destruction of the condenser itself for cycles not using an IHE and nearly 92% for those with an IHE. Moreover, the cycle power output was increased by 10-15%. Hence, the advantage of using an IHE is demonstrated to reduce significantly the condensing load; and the optimal condensing temperature to maximize the cycle power output. As the temperature of the geofluid resource is reduced by 10oC, the cycle power output is reduced by approximately 18%. In short, a substantial decrease in work output can result from a small decrease in the geothermal resource temperature. In Fig. the geothermal resource temperatures of 110oC and 160oC. An optimal turbine inlet temperature is observed to yield minimum overall plant irreversibility, which also produced maximum cycle power output. Consequently, minimizing the loss of exergy in each components of the cycle, thus the overall plant irreversibility, would also maximize the cycle power output. 14, the overall plant irreversibility is plotted against the turbine inlet temperature for Figure 14: Overall plant irreversibility as a function of the turbine inlet temperature for oo geothermal resource temperature of (a) 110 C and (b) 160 C 4.4. Optimized solution A parametric optimization with n-pentane as working fluid for the selected cycles was conducted for a geothermal resource temperature in the range of 110oC and 160oC. The optimal operating conditions were determined for maximum cycle power output per unit mass flow rate of the geothermal fluid, as well as minimum overall plant irreversibility. As illustrated by Fig. 15a, the optimal turbine inlet temperature is seen to increase almost linearly with the increase in the geothermal resource temperature. The addition of an IHE to the binary cycle has merely impacted on the optimum operating conditions of the ORCs, whereas adding an OFOH has required high optimal turbine inlet temperatures, approximately 10oC as compare to the basic Rankine ORCs, for a given geothermal resource temperature.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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