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The next fluid analyzed was R-245fa. It was found that the cycle was most efficient operating between 157psia and 58psia. This leads to a temperature range between 200 ̊F and 130 ̊F. The cycle with R-245fa has a Carnot efficiency of about 10.5% and a thermal efficiency of 7.6% this means that the cycle is operating at about 72.8% of the maximum possible efficiency. The work output was found to be about 7BTU/lb with a heat input of 85.2BTU/lb. The temperature entropy diagram for R-245fa is shown below. 315 295 275 255 235 215 195 175 155 135 115 157 psia 58 psia State 1 State 2 State 3 State 4 State 2a State 4a R245fa 0.25 0.3 0.35 0.4 0.45 Entropy (BTU/lb*R) Figure 2.6: R-245fa T-s Diagram The last fluid analyzed was R-123. It was found that the cycle was most efficient operating between 97psia and 42psia. This leads to a temperature range between 200 ̊F and 140 ̊F. The cycle with R-123 has a Carnot efficiency of about 9% and a thermal efficiency of 6.8% this means that the cycle is operating at about 75.5% of the maximum possible efficiency. The 40 Temperature ( ̊F)PDF Image | NESTER, RYAN TIMOTHY. Organic Rankine Cycles: A Comparative Study and Analysis of Multiple Applications.
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