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Michael Hoch / EP-AIT1 TPC Resistor Rod
Michael Hoch / EP-AIT2 Resistor Chain: Design Constrains current per resistor chain: 241 A = 25W (total = 100W) Temperature stability of 0.1degree So cooling is required !
Michael Hoch / EP-AIT3 Liquid Cooling Tested liquids: Water, Silicon Oil, C 6 F 14, Result: No thermal problem, but high risk of gas contamination
Michael Hoch / EP-AIT4 Gas Cooling Cooling capability of gases ~1000 times less efficient than liquids ‒H 2 O: = 998 [kg/m 3 ], cp= 4190 [J/kgC] ‒Air: =1.18 [kg/m 3 ], cp= 1007 [J/kgC] ‒CO2: =1.81 [kg/m 3 ], cp= 844 [J/kgC] Different approach necessary ‒Return cooling path ‒Insulation around the rod
Michael Hoch / EP-AIT5 Test Setup Thermal Box ‘Return’ Rod: Cooling Gas: Air
Michael Hoch / EP-AIT6 Setup Boundary Conditions Same dimensions like inner cooling rod Gas flow: 10m3/h Box temp: 20degree Coolant : air
Michael Hoch / EP-AIT7 Rod Temperature Sensors inside rod coolant path: 1-6 Outside surface : 7-11
Michael Hoch / EP-AIT8 Gas temp. along the coolant path
Michael Hoch / EP-AIT9 Outer Tube Surface Temperatures
Michael Hoch / EP-AIT10 Temperatures around the Rod
Michael Hoch / EP-AIT11 Rod with Double Wall Insulation
Michael Hoch / EP-AIT12 Resistor Rod Validation Thermal & vibration test with ‘small double wall’ proto type ‒January 2002 HV & System tests with real size resistor rod ‒Start: March 2002
Michael Hoch / EP-AIT13 Conclusion Thermal results of ‘return rod design’ are promising Small prototyping helped to optimize the assembly Resistor Rods will be ready in time
Why does heat transfer happen?
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