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(National Instruments, 2008) data acquisition and control system. The control system will use a variety of controllers (on-off or Proportional-Integral-Derivative [PID] control loops) to control the three major control mechanisms which include the fill inventory, the cooling water flow rate, and the warm water re- circulation fraction. The control system was described in the previous quarterly report. The new upgrades include the use of three new displays. The first two show the T-S diagram and the T-density diagrams near the saturation dome with the currently measured state points shown on the plot. Figure 3-17 shows an image of the front panel on the control system. The top part of the screen shows a simple flow diagram of the loop with the temperature and pressure state points displayed real time on the display. The controls to the right control the water flow control valve which will be used to control the compressor inlet temperature. These controls also control the main - flow valve and have digital controls and set points for other systems that are currently not being used. The lower portion of the plot controls the shaft speed, heater power (if available) emergency shutdown and data file naming and storage. Figure 3-18 shows the compression loop control but with a real time display of the T-S diagram and the T-D (temperature – density) diagram. The state points for the compressor inlet, outlet, and gas chiller are plotted on this curve to visually illustrate to the operator exactly where on the T-S diagram the loop is operating with respect to the critical point. This display tab is illustrated in Figure 3-18. Another tab on the control system shows the compressor map and the location of the compressor inlet for the past 100 recorded time steps. To display this map, the data acquisition and control system must calculate the corrected enthalpy for every time point, which is done every time step. The sampling time is about 4 samples per second. Figure 3-17: SNL supercritical CO2 data acquisition and control system. The control system allows for the monitoring of the state points in the loop, compressor speed control, heater control, compressor inlet temperature and pressure control, inventory fill control, recirculation and orifice flow control, a reactor simulator, emergency shutdown capabilities, and file name control. 38PDF Image | Operation and Analysis of a Supercritical CO2 Brayton Cycle
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