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CHAPTER 4: Manufacturing and Experimental Testing of the Developed Compressed Air RIT Table 4-1 Summary of the calibration formula and uncertainty of thermocouples Thermocouple number Thermocouple-1 Thermocouple-2 Thermocouple-3 Thermocouple-4 Thermocouple-5 Thermocouple-6 Thermocouple-7 Curve fit formula R2 Uncertainty ( ̊C) 1.0101×T-0.7849 0.9999 1.0127×T-0.9378 1 1.0124×T-0.8724 1 1.0121×T-0.2993 1 1.01×T-0.3848 0.9999 1.0105×T+0.2354 0.9999 1.0148×T-0.3227 1 ±0.764 ±0.712 ±0.697 ±0.653 ±0.607 ±0.735 ±0.726 4.3.5.2. Uncertainty propagation in pressure measurements Two 10 bar pressure transducers (GE UNIK 5000) were connected to the inlet Pitot- static tube while a 6bar (Druck PTX 1400) was fitted at the turbine exit. Since the transducers were 4-20mA transducers, 100 ohm resistances were soldered to the external board of data logger for conversion of current to voltage. Table 4-2 summarizes the curve fit formula and uncertainty of each transducer. Details of uncertainty calculations are described in Appendix A. Table 4-2 Summary of the calibration formula and uncertainty of pressure transducers Transducer GE UNIK 5000-1 GE UNIK 5000-2 Druck PTX 1400 Curve fit formula 6.324× volt-2.5024 6.3001× volt-2.4748 3.7506× volt -1.4925 R2 Uncertainty (Bar) 0.9999 ±0.0421 0.9999 ±0.0416 0.9999 ±0.0414 4.3.6. Experimental results and validation of the CFD model The experiments were conducted at a range of turbine inlet temperature, pressure, flow rate and rotational speed. Initially based on the required turbine inlet temperature the value is adjusted using the control box to control the heat flux from the heater tape and as soon as the temperature reaches the required level at turbine inlet the heat is cut off automatically by the control box. For each set of experiments the turbine inlet temperature was fixed while varying other above-mentioned parameters. Then the turbine 141 | P a g ePDF Image | SMALL-SCALE RADIAL INFLOW TURBINE FOR WHR ORC
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