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The built in volume ratio (BVR) is very important in modeling the scroll expander since it decides what the volume of the fluid will be at the end of the expansion process. This ultimately decides optimal pressure ratio and the amount of work that can be extracted from the superheated fluid. The built in volume ratio is part of the analysis that makes up the complete modeling of the scroll machine; other considerations are internal leakage and friction losses. These volume relations also play a role in determining the amount of torque and work that the scroll expander will output. Later sub sections on the expander thermodynamic modeling derive parameters from these volume relations. 5.2 Working Fluid Selection Several different working fluids were chosen for the analysis to study the behaviour of the system with each one. Table 5.1 outlines the appropriate working fluids consolidated using the preliminary selection techniques. Not all working fluids are tested due to the number of restrictions. The first restriction is that the critical pressure and temperature of some of the working fluids is too low to be used with the degree of superheat and inlet temperatures involved. R32 has a critical temperature of 78.4 ̊C which means that in order to use it, the superheat needs to be high. When expanded optimally at a pressure ratio of 3.62, the condensation temperature was below 25 ̊C. Therefore the fluid would never properly run in the program made in EES. Fluids are chosen based on having critical temperatures above 90 ̊C. Another issue is that the properties of R236fa are not correct in EES, producing results which do not make sense. This is due to the equations of state being programmed incorrectly into EES producing enthalpy values which do not correspond to other parameters in the state equations. When comparing enthalpy values to the actual property tables from the manufacturer this issue becomes apparent. The last restriction is 37PDF Image | Exergoeconomic Analysis and Optimization of ORC
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