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TSD BN Product - Test

 

 

 

 

   
Test: Thermal Conductivity
Goal: Transfer heat using TSD BN coating
Application: Heat exchanger
Test Date: October 15, 2004
Test Subject: 7x5x 94ksi aluminum-scandium tubing (51.2mm ID x 1067mm L x 1.3mm Thick)
Room Temperature:

77.54°F

 

Test 1:  Tube NOT Coated with TSD BN Thermal Coating (Blue Version)

Time

(Minutes)

Room Temperature

 (F)

Exhaust   Air Temperature

 (F)

A

Intake Blower Air Temperature

 (F)

E

Tube Surface Temperature

(F) 

B

Tube Surface Temperature

(F) 

C

Tube Surface Temperature

(F)

D

0

77.54°

77.54°

194.36°

78.80°

78.80°

78.80°

3

77.54°

175.1°

194.36°

82.40°

96.80°

109.40°

6

77.54°

182.12°

194.36°

88.34°

105.80°

122.00°

9

77.54°

182.66°

194.36°

88.16°

106.34°

122.18°

Test 2:  Tube Coated with TSD BN Thermal Coating (Blue Version)

Time

(Minutes)

Room Temperature

 (F)

Exhaust   Air Temperature

 (F)

A

Intake Blower Air Temperature

 (F)

E

Tube Surface Temperature

(F) 

B

Tube Surface Temperature

(F) 

C

Tube Surface Temperature

(F)

D

0

77.54°

77.54°

194.36°

78.80°

78.80°

78.80°

3

77.54°

174.74°

194.36°

103.28°

111.92°

138.20°

6

77.54°

175.64°

194.36°

103.28°

111.20°

140.00°

9

77.54°

175.46°

194.36°

103.10°

111.56°

140.00°

 

Exhaust Air Comparison

 

The test shown exhaust air temperature greatly reduced with tube coated with BN coating.  At 9 minute of testing, the exhaust air temperature was at 175.46° (tube w/TSD coating) compared to 182.66° (tube w/o TSD coating).

 

 

Test Conclusion

First off, two aluminum tubing for subject test to compare how the subject will able to dispense heat quicker with boron nitride coated.  One tube was coated with boron nitride.

A heat blower placed at the end of tube, blow the hot air in from one end and measured the exit air temperature at the other end.  Air blower cooled the tube exterior at giving room temperature.

The test result showed that the boron nitride able to attract heat from the alloy and transfer the heat to be cooled down by air.  The boron nitride also creates a semi-rough surface in which increase the air contact surface.  (see drawing on the left)

With the increase of air surface temperature and excellent BN thermo property, our test showed 20 degree F hotter from the surface of the tube coated with TSD boron nitride.  This showed the heat was quickly transferred from inner tube surface onto boron nitride and cooled by the air.  The exhaust air was 7° cooler with straight tube coated with boron nitride.

The straight tube allowed hot air passed through the tube without being cooled by tube inner wall.  Thereof, the straight tube was not a good heat exchanger.  If the test conducted on actually heat exchanger, the result will significantly show lower exhaust air temperatures with boron nitride coating.

We concluded that the boron nitride is an excellent property to be coated onto oil cooler, intercooler, radiator, etc. in which the item required to be cooled by air.