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Master’s of Engineering ProjectFall 2010
Viram Pandya
One proposal for Generation IV reactors is the High Temperature Helium Cooled Reactor
Nuclear core and power production separated into two different pressure vessels (General Atomics design)
Connected by a coaxial tube called the hot gas duct (HGD)
Inner tube transports heated helium from the core to the turbine. Outer tube moves cooler helium back into core
Hot gas duct
General Atomics Gas-Turbine Modular Helium Reactor (GT-MHR)
Cross-section of HGD
Perform a complete thermal analysis on the HGD using analytic techniques and finite element software Determine heat losses through the HGD under
different flow conditions Determine thermal conductivity of the
insulation Analyze amount of thermal expansion realized Model simple version of a HGD under different
flow conditions on COMSOL
Review steady state heat conduction through shell
Review concept of critical radius of insulation Study and apply laminar flow to HGD, followed
by laminar flow with heat transfer Study and apply turbulent flow to HGD,
followed by turbulent flow with heat transfer Create idealized model of HGD using COMSOL
Adding insulation to cylinder creates contradiction: Increases conduction resistance of insulation layer Decreases convection resistance of surface due to
increase in surface area Critical radius achieved when r = k/h