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NSTX TF Bundle & Center Stack Curing Oven

Mike Viola Joe Rushinski Frank Jones April 14, 2003. NSTX TF Bundle & Center Stack Curing Oven. NSTX TF Bundle & Center Stack Curing Oven. Criteria: Fit the TF bundle with Hub Assembly Oven is 4’ x 4’ x 24’ long

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NSTX TF Bundle & Center Stack Curing Oven

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  1. Mike Viola Joe Rushinski Frank Jones April 14, 2003 NSTX TF Bundle & Center Stack Curing Oven

  2. NSTX TF Bundle & Center Stack Curing Oven • Criteria: • Fit the TF bundle with Hub Assembly • Oven is 4’ x 4’ x 24’ long • Controlled heating to 200ºC (392ºF) for epoxy curing and 465ºF for tube soldering • Oven is capable of 600ºF • Uniform Heating • Oven is 384 ft3 @1000 CFM ~ 3 air changes per minute • Easy access to bundle during curing for bolt tightening • Oven is split lengthwise with guidepins (no bolts)

  3. NSTX TF Bundle & Center Stack Curing Oven • Reduced size for future storage & handling • Oven is built in three 8’ sections • Feedthroughs for 12 thermocouples • Windows for viewing potential problems • 4 windows provided (2 at each end) • Parts available to the NCSX Autoclave • Heaters (2 @ 12 KW) • Blower (2000 CFM @ 5 in.; 4000 CFM @ 2 in.)

  4. NSTX TF Bundle & Center Stack Curing Oven Duct Pressure Loss and Velocity Pressure Results Job Number:  TF Bundle Oven Line Number:  Oven Supply  Fluid:  Air Duct Type:  RECTANGULARDuct Side a Dimension (in):  14Duct Side b Dimension (in):  8Flow Rate:  2000 SCFM Duct Length (ft):   14Viscosity (cP):  0.018Inlet Pressure (PSIG):  0Temperature (F):  500Duct Material:  GALVANIZED METAL Duct Roughness (ft):  0.0005Fluid Velocity (ft/min):5159.32Reynolds Number:  280907Flow Region:  TurbulentFriction Factor:  0.0184Density at Inlet:  0.041Specific Volume at Inlet:  24.163Specific Heat Ratio:  1.4 Straight Duct Loss (inches Water):  0.248Hood Entry Type:  NoneElbow Aspect Ratio 1:  2.0Radius / Duct Diameter 1:  1.0Number Of Elbows 1:  2Elbow Loss Factor 1:  0.21Elbow Loss 1 (inches Water):  0.385Duct Exit Configuration:  Expansion within Duct Expansion Taper Angle (Degrees):  30Diameter Ratio:  1.75:1Loss Factor:  0.51Velocity Pressure Outlet (inches Water):  0.097761953Exit Configuration Loss (inches Water):  -0.292Equipment Name 1:  HeaterEquipment 1 Pressure Drop (inches Water):  0.05Equipment Name 2:  HeaterEquipment 2 Pressure Drop (inches Water):  0.05 Velocity Pressure (inches Water):  0.917 Total Duct Loss (inches Water):  0.441 Velocity High: 5159.32

  5. NSTX TF Bundle & Center Stack Curing Oven Duct Pressure Loss and Velocity Pressure Results Job Number:  TF Bundle Oven Line Number:  Oven Return  Fluid:  Air   Duct Type:  ROUNDDuct Diameter (in):  12Flow Rate:  2000 SCFM Duct Length (ft):   14Viscosity (cP):  0.018Inlet Pressure (PSIG):  0Temperature (F):  500Duct Material:  GALVANIZED METAL Duct Roughness (ft):  0.0005Fluid Velocity (ft/min):  4703.58Reynolds Number:  268213Flow Region:  TurbulentFriction Factor:  0.0184Density at Inlet:  0.041Specific Volume at Inlet:  24.163Specific Heat Ratio:  1.4 Straight Duct Loss (inches Water):  0.196Hood Entry Type:  NoneElbow Type 1:  4 piece Radius / Duct Diameter 1:  1.50Number Of Elbows 1:  3Elbow Sweep 1 (Degrees):  90Elbow Loss Factor 1:  0.27Elbow Loss 1 (inches Water):  0.617Duct Exit Configuration:  Vertical Discharge, No Loss Exit Configuration Loss (inches Water):  0 Velocity Pressure (inches Water):  0.762 Total Duct Loss (inches Water):  0.814

  6. NSTX TF Bundle & Center Stack Curing Oven Choose 12x12 Square Supply with 14” round return

  7. NSTX TF Bundle & Center Stack Curing Oven Duct Pressure Loss and Velocity Pressure Results Job Number:  TF Bundle Oven Line Number:  Oven Supply 12” x 12” Square Fluid:  Air Duct Type:  RECTANGULARDuct Side a Dimension (in):  12Duct Side b Dimension (in):  12Flow Rate:  2000 SCFM Duct Length (ft):   14Viscosity (cP):  0.018Inlet Pressure (PSIG):  0Temperature (F):  500Duct Material:  GALVANIZED METAL Duct Roughness (ft):  0.0005Fluid Velocity (ft/min):  3936.01Reynolds Number:  245354Flow Region:  TurbulentFriction Factor:  0.0183Density at Inlet:  0.041Specific Volume at Inlet:  24.163Specific Heat Ratio:  1.4 Straight Duct Loss (inches Water):  0.125Hood Entry Type:  NoneElbow Aspect Ratio 1:  1.0Radius / Duct Diameter 1:  1.5Number Of Elbows 1:  2Elbow Loss Factor 1:  0.13Elbow Loss 1 (inches Water):  0.139Duct Exit Configuration:  Vertical Discharge, No Loss Exit Configuration Loss (inches Water):  0Equipment Name 1:  HeaterEquipment 1 Pressure Drop (inches Water):  0.05Equipment Name 2:  HeaterEquipment 2 Pressure Drop (inches Water):  0.05 Total Duct Loss (inches Water):  0.364 Velocity Pressure (inches Water):  0.534

  8. NSTX TF Bundle & Center Stack Curing Oven Duct Pressure Loss and Velocity Pressure Results Job Number:  TF Bundle Oven Line Number: Oven Return 14” Round Fluid:  Air Duct Type:  ROUNDDuct Diameter (in):  14Flow Rate:  2000 SCFM Duct Length (ft):   14Viscosity (cP):  0.018Inlet Pressure (PSIG):  0Temperature (F):  500Duct Material:  GALVANIZED METAL Duct Roughness (ft):  0.0005Fluid Velocity (ft/min):  3455.69Reynolds Number:  229897Flow Region:  TurbulentFriction Factor:  0.0182Density at Inlet:  0.041Specific Volume at Inlet:  24.163Specific Heat Ratio:  1.4 Straight Duct Loss (inches Water):  0.09Hood Entry Type:  NoneElbow Type 1:  4 piece Radius / Duct Diameter 1:  2.50Number Of Elbows 1:  3Elbow Sweep 1 (Degrees):  90Elbow Loss Factor 1:  0.23Elbow Loss 1 (inches Water):  0.284Duct Exit Configuration:  Vertical Discharge, No Loss Exit Configuration Loss (inches Water):  0 Total Duct Loss (inches Water):  0.374 Velocity Pressure (inches Water):  0.411

  9. NSTX TF Bundle & Center Stack Curing Oven Duct Pressure Loss and Velocity Pressure Results Job Number:  TF Bundle Oven Line Number:  Oven Body  Fluid:  Air Duct Type:  RECTANGULARDuct Side a Dimension (in):  40Duct Side b Dimension (in):  40Flow Rate:  2000 SCFM Duct Length (ft):   24Viscosity (cP):  0.018Inlet Pressure (PSIG):  0Temperature (F):  500Duct Material:  GALVANIZED METAL Duct Roughness (ft):  0.0005Fluid Velocity (ft/min):  354.24Reynolds Number:  73606Flow Region:  TurbulentFriction Factor:  0.0198Density at Inlet:  0.041Specific Volume at Inlet:  24.163Specific Heat Ratio:  1.4 Straight Duct Loss (inches Water):  0.002Hood Entry Type:  NoneDuct Exit Configuration:  Vertical Discharge, No Loss Exit Configuration Loss (inches Water):  0 Velocity Pressure (inches Water):  0.004 Total Duct Loss (inches Water):  0.002

  10. NSTX TF Bundle & Center Stack Curing Oven • Heaters: • 480 3Ø • require a minimum of 6 ft/sec @ 650ºF • Heater duct is 12”x24” ∴ min flow required is 750 CFM • Blower: • Radial fan to provide high flow rates @ pressure • Max Temp is 600ºF • 208 3Ø • Insulation: • 2”

  11. NSTX TF Bundle & Center Stack Curing Oven INSULATION

  12. NSTX TF Bundle & Center Stack Curing Oven • Mass: • TF Bundle 2820 lbs. • Mold 4500 lbs. • Oven 7400 lbs. • Thermal units: Thermal Conductivity Specific Heat • BTU/h (ft) ºF BTU/(lb) ºF • Copper 227 .092 • Steel 9.4 .12 • Air .018 • Heat needed: Q=m Cp ΔT=lb (BTU/lb ºF) ºF • QCopper=2820 (.092) (392-70)=83,540 BTU • QSteel=11900 (.12) (392-70)=459,816 BTU • QTotal=543,356 BTU • 1 KW=3412.14BTU/h • QTot=159 KW-hours for a 9 hours rise=17.7 KW/hour • Convection heat transferred: q=h A ΔT • Initially q=(8 BTU/h (ft2) ºF) 25 ft2 (392-70) = 64,400 BTU/h = 18.8 KW • Final q=(8 BTU/h (ft2) ºF) 25 ft2 (400-392) = 1,600 BTU/h = 1 KW • Plus losses through insulation: 4 KW

  13. NSTX TF Bundle & Center Stack Curing Oven

  14. NSTX TF Bundle & Center Stack Curing Oven

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