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pressure in state four, just like the previous step, but instead of using the entropy value that is equivalent to state two’s entropy the quality is assumed to be zero which causes the temperature to be the saturation temperature at that given pressure. This has a very small effect on the ideal cycle assumption because the values of entropy calculated both ways were within 5% difference of each other. Now that the cycle had been evaluated at each specified state point, the first law of thermodynamics was checked to make sure that no energy was created or destroyed. The thermal efficiency was then calculated through the following equation. (2.8) This theoretical analysis was performed for multiple operating conditions and multiple working fluids. The three fluids investigated and compared were R-245fa, R-245ca, and R- 123. These fluids were chosen because they are all dry fluids and they all are used in commercially available ORC’s. The dry fluids were chosen because these types of fluids have the highest efficiencies in ORC’s due to the fact that the fluids are inherently superheated at the outlet of the boiler based on the temperature versus enthalpy diagrams of the fluids. Once the fluids were selected each fluid was analyzed at a range of boiler pressures, temperatures, flow rates, and assumed power. These specified operating conditions are shown in Tables 2.1, 2.2, and 2.3. All the pressures listed correspond to the maximum pressure in the system which is also the pressure at state three or the boiler pressure. The 29PDF Image | NESTER, RYAN TIMOTHY. Organic Rankine Cycles: A Comparative Study and Analysis of Multiple Applications.
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