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pressure and entropy at state two and four were known. Once all the state points were found an energy balance was performed on the cycle to calculate the work input, work output, heat input, heat output, thermal efficiency, and Carnot efficiency. The heat input/output was calculated through the enthalpy difference between the two state points as well as the work input. To determine the actual properties ate state two and state four, an isentropic efficiency of the turbine was set to 85% and the isentropic efficiency of the pump was set to 87%. R-245ca 325 275 225 175 125 75 115 psia 25 psia State 1 State 2 State 3 State 4 State 2a State 4a 0.25 0.3 0.35 0.4 0.45 Entropy (BTU/lb*R) Figure 2.5: R-245ca T-s Diagram The plot above shows the T-s diagram for R-245ca. It can be seen that the cycle was operating between 115psia and 25psia. The work output was found to be 10.996 BTU/lb, with a heat input of 100.477 BTU/lb. This leads to a thermal efficiency of about 10.5%. Since the cycle was operating between 200 ̊F and 103 ̊F the Carnot efficiency was about 14.6%. Therefore the cycle is operating at about 71.7% of the Carnot efficiency. 39 Temperature ( ̊F)PDF Image | NESTER, RYAN TIMOTHY. Organic Rankine Cycles: A Comparative Study and Analysis of Multiple Applications.
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