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4. Modeling As mentioned in the introduction, one of the primary tasks for this work was to commission and characterize an experimental Tesla-hybrid turbine running as the expander of an ORC. The turbine was provided by Toucan Design Inc. of Boulder, CO, USA and was the starting point of the thermodynamic and physical system models. Other constraints were dictated by the operating environment at the EECL. Constraints and assumptions shown in Table 4-1 were placed on the thermodynamic model. Table 4-1: Model constraints and assumptions. Constraint Affects Values Varies with working fluid 75% 75% Direct Dry Cooling Condensing Temperature 55 to 15 °C Direct Dry Cooling Turbine Isentropic Efficiency Pump Isentropic Efficiency Condensing Pressure Power Generation Power Consumption Available Glycol Temperature Vaporizing Temperature 85 °C Turbine Expansion Ratio Cycle Efficiency Infinitely Variable Thermodynamic modeling of the ORC to determine performance of working fluid was completed in Microsoft Excel using REFPROP [22] to calculate thermodynamic properties. A standard 75% isentropic efficiency was placed on the pump and turbine. As mentioned in section 2.3, there are many working fluids to be considered and several could produce better system efficiency numbers than R245fa, but are not safe for the environment or the operating facility. A plot of system efficiency versus condensate return temperature for R245fa is shown in Figure 4-1. 20PDF Image | ORC WASTE HEAT RECOVERY SYSTEM WITH A TESLA-HYBRID
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