For Air Conditioning, Refrigeration and Freezer Applications        

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· Alloys Available

UNS C12200, DHP Copper only.  CU 99.9% Minimum, P 0.015 to 40%

· Application Standards

ASTM B743 (Except Hardness) ASTM B68
ASTM B75

· Product Formats Available

Level Wound Coils on Fiberboard Reels, or Bulk Pack and Banded.  Coils are stacked on pallets and packaged in Tubular Corregated Fiberboard Containers, or may be shrink wrapped.

· Tempers Available 

ASTM H58
ASTM O60
ASTM O50
General Purpose Temper Skin Temper (Straight Only) wooden boxes and shipping frames.

· Testing

All Turbo-A is 100% eddy current tested, expansion tested and visually checked for ridge deformities.

Maximum Your ACR Equipment Efficiency

Turbo-A is a seamless copper tube with plain O.D. surface and helical, integral ridges on the I.D. for enhanced heat transfer.  The internal ridges significantly improve the efficiency of heat exchangers in which refrigerant condenses or evaporates within the tube.  Typical applications include fin and tube evaporator and condenser coils for air conditioners, freezers, and refrigerators.

  The tube is typically supplied in Level Wound Coils.  However, it can also be provided in straight lengths.

Wolverine Tube also makes products intended for tube and shell heat exchangers.  See the Turbo-DX bulletin.  In addition, Turbo-ASG and Turbo-AXG, a welded tube with identical characteristic performance to Turbo-A characteristics, is also available.

 

Turbo-A and Turbo-ASG Performances
Click on the appropriate units system below to view the performance graphs of a specific tube size and refrigerant.
 
Tube Size
inch (mm)		 Refrigerant
0.28 (7.0) 22
5/16 (7.94) 22
5/16 (7.94) 410a
3/8 (9.53) 22
3/8 (9.53) 410a

 

EXPERIMENTAL APPARATUS:

 
· Water cooled counter flow type Coaxial Heat Exchanger
· Effective length: 13.3 ft
· Refrigerant inside test tube: R-22
· Fluid on Annulus: Water

 

TEST CONDITIONS:
 
  Evaporation Condensation

Test Temperature     (o F)

33 - 37

100 - 105

Inlet Vapor Quality (%)

10, ± 1

80, ± 3

Exit Vapor Quality (%)

80, ± 3

10, ± 3

Test flow rate (lb/hr)

60 - 200 in steps of 20 for 3/8"
40 - 160 in steps of 20 for 5/16"
30 - 150 in steps of 30 for 7 mm

100 - 500 in steps of 100 for 3/8"
80 - 400 in steps of 80 for 5/16"
60 - 300 in steps of 60 for 7 mm

Water flow rate (lb/hr)

900 - 1800

1200 - 2400

Minimum water temperature difference  (o F)

3

3

 

CALCULATION OF INTUBE HEAT TRANSFER COEFFICIENT:
 
Heat Transfer Rate: Q = [m Cp (Ti - To)]water
Overall Coefficient: Uo = Q / Ao / LMTD
Annulus Coefficient: ho = Co (k / Dh) (Re)0.8 (Pr)1/3 (m / mw)
Intube Heat Transfer Coefficient: hi = [1 / (1 / Uo - 1 / ho - Rw)] (Ao / Ai)

 

STANDARD SIZES:
 

Turbo-A - UNS C12200

Catalog Number Outside Diameter
inch (mm) 		Bottom Wall
inch (mm) 		Number of Ridges Ridge Height
inch (mm) 		Helix Angle
degree 		Weight Per  Unit Length
lb/ft (kg/m)
36-23121208 0.312 (7.92) 0.012 (0.305) 50 0.008 (0.203) 18 0.052 (0.077)
36-23121258 0.312 (7.92) 0.013 (0.318) 50 0.008 (0.203) 18 0.055 (0.082)
36-23131258 0.313 (7.95) 0.013 (0.318) 50 0.008 (0.203) 18 0.055 (0.082)
36-23151208 0.315 (8.00) 0.012 (0.305) 50 0.008 (0.203) 18 0.052 (0.077)
36-23151258 0.315 (8.00) 0.013 (0.318) 50 0.008 (0.203) 18 0.055 (0.082)
36-33651208 0.365 (9.27) 0.012 (0.305) 60 0.008 (0.203) 18 0.062 (0.092)
36-33651608 0.365 (9.27) 0.016 (0.406) 60 0.008 (0.203) 18 0.077 (0.115)
36-33731408 0.373 (9.47) 0.014 (0.356) 60 0.008 (0.203) 18 0.071 (0.106)
36-33741208 0.374 (9.50) 0.012 (0.305) 60 0.008 (0.203) 18 0.063 (0.094)
36-33751208 3/8 (9.53) 0.012 (0.305) 60 0.008 (0.203) 18 0.063 (0.094)
36-33751258 3/8 (9.53) 0.013 (0.318) 60 0.008 (0.203) 18 0.065 (0.097)
36-33751308 3/8 (9.53) 0.013 (0.330) 60 0.008 (0.203) 18 0.067 (0.100)
36-33751408 3/8 (9.53) 0.014 (0.356) 60 0.008 (0.203) 18 0.071 (0.106)
36-33751508 3/8 (9.53) 0.015 (0.381) 60 0.008 (0.203) 18 0.077 (0.115)
36-33751608 3/8 (9.53) 0.016 (0.406) 60 0.008 (0.203) 18 0.079 (0.118)
36-33761208 0.376 (9.55) 0.012 (0.305) 60 0.008 (0.203) 18 0.063 (0.094)
36-33761258 0.376 (9.55) 0.013 (0.318) 60 0.008 (0.203) 18 0.065 (0.097)
36-33761308 0.376 (9.55) 0.013 (0.330) 60 0.008 (0.203) 18 0.067 (0.100)
36-33761358 0.376 (9.55) 0.014 (0.343) 60 0.008 (0.203) 18 0.070 (0.104)
36-33761408 0.376 (9.55) 0.014 (0.356) 60 0.008 (0.203) 18 0.071 (0.106)
36-33761608 0.376 (9.55) 0.016 (0.406) 60 0.008 (0.203) 18 0.079 (0.118)
36-34851710 0.485 (12.32) 0.017 (0.432) 60 0.010 (0.254) 18 0.114 (0.170)
36-35001510 1/2 (12.70) 0.015 (0.381) 60 0.010 (0.254) 18 0.105 (0.156)
36-35001550 1/2 (12.70) 0.016 (0.394) 60 0.010 (0.254) 18 0.107 (0.160)
36-35001610 1/2 (12.70) 0.016 (0.406) 60 0.010 (0.254) 18 0.110 (0.164)
36-35001710 1/2 (12.70) 0.017 (0.432) 60 0.010 (0.254) 18 0.116 (0.172)
36-35001810 1/2 (12.70) 0.018 (0.457) 60 0.010 (0.254) 18 0.122 (0.181)
36-35001910 1/2 (12.70) 0.019 (0.483) 60 0.010 (0.254) 18 0.133 (0.198)
36-53761206 0.376 (9.55) 0.012 (0.305) 65 0.006 (0.152) 25 0.063 (0.094)
36-53761256 0.376 (9.55) 0.013 (0.318) 65 0.006 (0.152) 25 0.065 (0.097)
36-45001310 1/2 (12.70) 0.013 (0.330) 75 0.010 (0.254) 18 0.100 (0.149)
36-45021310 0.502 (12.75) 0.013 (0.330) 75 0.010 (0.254) 18 0.100 (0.149)

 

 N = Number of Ridges H = Helix Angle

 

 
Tolerances: Outside Diameter ± 0.002" Average
Bottom Wall Up to 0.017", inclusive ± 0.001" AAP
Over 0.017" to 0.024", inclusive ± 0.002" AAP
Ridge Height ± 0.002" AAP
Helix Angle + 0, ± 3o
Weight ± 4%
 
Other sizes and wall thickness may be available.
Tube Form: Straight length or level wound coil.
 

 

SPECIFICATIONS FOR TURBO-A INNER RIDGED COPPER TUBE
 
   
  Mechanical Properties:
  Tensile Strength Minimum psi - 30,000 (207 MPa) 
  Yield Strength Minimum psi - 9,000 (62 MPa) 
  Elongation in 2" (50.8 mm) Minimum 40%
  Grain Size 0.015 - 0.040 mm
   
  Cleanliness and Appearance:

Tubes are clean and bright on the inside and outside surfaces, free from silvers, scale, open grain and major metal defects, such as inclusions.  Any residue on the inside of the tube will not exceed 0.0035 g/ft2 (0.0377 g/m2).

   
  Dimensions:
 

24" (609.6mm) ID x 33/38" (838/965 mm) OD x 10" (254.0 mm) wide coil.  Reels have arbor hole with 5" (127.0 mm) diameter.  Overall reel diameters are 38" (965.2 mm) or 41" (1041.4 mm).

   
  Marking:
  Shipping Labels on the outside of each package include the following items.
    Dimensions of the tube Customer's part number or tagging information
    Weight of tube Name of manufacturer
    Customer's order number Production order number
       

 

NOMENCLATURE:
 
Ai Inside area of test tube on  (ft2) m Viscosity of water at average  [lb/(ft hr)]
inside diameter water temperature
Ao Outside area of test tube (ft2) mw Viscosity of water at wall [lb/(ft hr)]
Co Sieder & Tate Constant for  temperature
annulus found by using a Pr Prandtl number of water at
Wilson plot method average water temperature
Cp Specific Heat [Btu/(lb o F)] Q Heat Rate (Btu/hr)
Dh Annulus hydraulic diameter (ft) Re Reynolds number of water at
hi Inside heat transfer coefficient [Btu/(hr ft2 o F)] average water temperature
ho Annulus heat transfer coefficient [Btu/(hr ft o F)] Rw Wall Resistance (hr ft2 o F/Btu)
k Thermal conductivity of water [Btu/(hr ft o F)] Ti Water inlet temperature (o F)
LMTD Logarithmic Mean Temperature (o F) To Water outlet temperature (o F)
Difference Uo Overall heat Transfer coefficient [Btu/(hr ft2 o F)]
m Flow Rate (lb/hr)

 

WHTFT Rev. 3 12/00