Operation and Analysis of a Supercritical CO2 Brayton Cycle

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Operation and Analysis of a Supercritical CO2 Brayton Cycle ( operation-and-analysis-supercritical-co2-brayton-cycle )

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Figure 3-16: Motor alternator controller. 3.5 Instrumentation To measure the fluid temperatures (water and CO2), we use Resistance Thermometry Devices (RTD’s) which have an accuracy of ~0.2 K and thermocouples which have an accuracy of ~1 K. These devices will be placed in the CO2 at the inlet and exit of every device. Pressure transducers will also be used to monitor the pressure at the inlet and outlet of every component. There is also an orifice flow meter that is located after the compressor outlet. We have also purchased a Coriolis flow meter to measure the mass flow rate and CO2 density. Two brands of Coriolis flow meters are found in the S-CO2 loop; Micro Motion and Endress+Hauser. The Micro Motion flow meter has a maximum operating pressure of 4790 psig and is located at the compressor inlet, while the Endress+Hauser flow meter has a maximum operating pressure of 5000 psig and is located at the outlet of the Haskel pumps. Specification sheets and photographs for each of these meters can be found in the pressure data package. 3.6 Control System A data acquisition and control system was assembled to monitor and control all of the state variables and status of the control mechanisms. This data acquisition system was installed by Sandia’s Instrumentation and Control Contractor, Prime Core (PrimeCore, 2008) and is being used to monitor the system state variables during the commissioning tests. The control system was also connected to the Labview 37

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