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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3.3 Watlow Heaters SNL and BNI have purchased commercially available immersion heaters from Watlow (Watlow, 2008). While these heaters are not included in the compression loop, they are built into the full Brayton loop discussed at the end of this report. These heaters provide 130 kW of electrical heating power per heater. Each heater also includes a heater controller. These controllers use Silicon Controlled Rectifier (SCR) switches to provide continuous control from 0 kWe to 130 kWe, using a 4-20 mA control signal. The design specs for these heaters are provided in Figure 3-13. The heaters are American Society of Mechanical Engineers (ASME) stamped and can operate at up to 1000°F = 810 K at 2585 psia. The Watlow heaters did not include the shells into which the immersion heaters need to be placed. SNL and BNI contracted Merrick Corporation to provide an ASME design for these heater shells. A contract was awarded to Springs, Inc to fabricate and ASME stamp the shells, which are designed to operate up to 2600 psia at 1000°F. Figure 3-14 shows a line drawing design for the heater shell. Figure 3-13: Watlow 130 kWe immersion heater design. 34

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