1. Chiho Wang ATLAS TRT Barrel Duke University U. Penn. Workshop, 2000 Module Thermal Analysis Chiho Wang Duke University

2. Chiho Wang ATLAS TRT Barrel Duke University U. Penn. Workshop, 1998 Module Thermal Analysis  Motivation: u To study how electronics affect module temperature.  Previous study - BNL calculations : u  T coolant ~ 0.5 - 1 ºC u  T module ~ 9 ºC

3. Chiho Wang ATLAS TRT Barrel Duke University U. Penn. Workshop, 1998 Duke Model  Duke calculation: u ANSYS 5.5.1 u 3D model, half module u Simulated elements:  shell –Kxyz=55 (W/mºC)  radiator + straw assembly –Kxy=0.05, Kz=0.122  HV plate –Kxy=6.3, Kz=0.265  tension plate –Kxy=6.3, Kz=0.265  gas volume between tension plate and HV plate –Kxy=0.009, Kz=0.242

4. Chiho Wang ATLAS TRT Barrel Duke University U. Penn. Workshop, 1998 Duke Model u Simplified geometry  Cooling tubes simulated by temperature assignments along the edges of shell  Ignore curvatures at corners of module, etc..

5. Chiho Wang ATLAS TRT Barrel Duke University U. Penn. Workshop, 1998 Case 1  Module without electronics u T coolant = 20ºC u No heat on tension plate u  T module ~ 9 ºC consistent with BNL results.

6. Chiho Wang ATLAS TRT Barrel Duke University U. Penn. Workshop, 1998 Case 2  Module with electronics u T coolant = 15ºC (module first, then electronics) u T tension plate = 30 ºC u  T module ~ 15 ºC

7. Chiho Wang ATLAS TRT Barrel Duke University U. Penn. Workshop, 1998 Case 3  Module with electronics u T coolant = 20ºC (electronics first, then module) u T tension plate = 30 ºC u  T module ~ 11 ºC

8. Chiho Wang ATLAS TRT Barrel Duke University U. Penn. Workshop, 1998 Case 4 - “on” side  Module with electronics, one side turned off u T coolant = 20ºC one tube, 15ºC other tube u T tension plate = 30ºC u  T module ~ 15ºC

9. Chiho Wang ATLAS TRT Barrel Duke University U. Penn. Workshop, 1998 Case 4 - “off” side  Module with electronics, one side turned off u T coolant = 20ºC one tube, 15ºC other tube u T tension plate = 15ºC u  T module ~ 12ºC

10. Chiho Wang ATLAS TRT Barrel Duke University U. Penn. Workshop, 1998 Summary  T module ~ 9ºC without electronics  With coolant flowing through module first before going through electronics: u  T module ~ 15ºC with electronics  With coolant flowing through electronics before going into the module: u  T module ~ 11ºC with electronics u  T module ~ 15ºC with electronics but one side turned off.