Performance of Heat Pipe
晨怡热管
2007-2-27 1:17:07
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A heat pipe is essentially a closed, evacuated tube lined with a porous structure called "wick structure". The wick is saturated with a proper amount of working fluid (typically water). When a portion of the heat pipe is exposed to heat
- The fluid in the heated portion vaporized (picking up thermal energy)
- The vapor flows to the cooler portion of the container
- The vapor cools and condenses (releasing thermal energy)
- Condensed fluid is returned by capillary action to the hotter portion
This thermodynamic cycle continues as the thermal energy is transferred from one end to the other. It is noted that the temperature will remain constant as the working fluid goes through the phase change inside the heat pipe chamber. This phenomenon makes the heat pipe a very efficient heat transfer device.
Heat pipes are totally passive heat transfer systems which having no moving parts to wear out, and they require no electrical energy to operate. They offer the design engineer low cost packaging and flexibility because they can be manufactured in a number of shapes and sizes. Their light weight and compact size also make them the ideal choice for space-constrained applications.
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Specifications and Features |
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| ITEM |
SPECIFICATION |
| Shape |
Round |
D: f 3 ~ f 10 +/- 0.1 mm |
| Flat |
t: 1.2 ~ t: 3.0 +/- 0.1 mm |
| Length |
80 ~ 350 +/- 1 mm |
| Material of Container |
OFHC |
| Working Fluid |
Pure H2O |
| Max. Heat Transfer Rate |
0 ~ 100 W |
Fail Temp
(No Cooling) |
Round |
> 320C Leakage |
| Flat |
> 140 oC Leakage |
| Thermal Resistance (a) |
0.02 ~ 0.9 oC/W |
| Life DT (b) |
< 2.0 oC |
| Inclination |
Any direction |
| Flexibility |
Curvature Rc=>9.5 mm |
| Guaranty |
5 years |
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- High heat transfer rate
- Quick thermal response
- High thermal uniformity
- No power needed
- Small volume and light weight
- Maintenance free
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Note: (a) Thermal Resistance = (Te - Tc)/Q |
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(b) DT = Tadia.-Tc (For 60oC Thermal bath) |
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Heat Pipe Flat Type Features |
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| D |
t |
Tolerance
t (+/-) |
W |
Tolerance
W (+/-) |
Curvature
(Center) |
Ineffective
length |
| f 3 |
2.5 |
0.10 |
3.42 |
0.10 |
RC9.5 |
Head end: 5.0
Tail end: 2.0
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| 2.0 |
3.67 |
| 1.8 |
3.82 |
| 1.5 |
4.00 |
| 1.2 |
4.09 |
| f 4 |
2.5 |
0.10 |
5.06 |
0.10 |
RC14 |
Head end: 7.0
Tail end: 4.0
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| 2.0 |
5.31 |
| 1.8 |
5.42 |
| 1.5 |
5.56 |
| 1.2 |
5.71 |
| f 5 |
2.5 |
0.10 |
6.61 |
0.10 |
RC18 |
Head end: 9.0
Tail end: 5.0
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| 2.0 |
6.90 |
| 1.8 |
7.00 |
| 1.5 |
7.15 |
| 1.2 |
7.26 |
| f 6 |
2.5 |
0.10 |
8.25 |
0.10 |
RC30 |
Head end: 10.0
Tail end: 6.0
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| 2.0 |
8.50 |
| 1.8 |
8.68 |
| 1.6 |
8.79 |
| 1.5 |
8.86 |
| 1.4 |
8.90 |
| 1.2 |
8.96 |
| f 8 |
2.5 |
0.10 |
11.56 |
0.10 |
T.B.D |
Head end: 15.0
Tail end: 9.0
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| 2.0 |
11.85 |
| 1.8 |
12.00 |
| 1.6 |
12.11 |
| 1.5 |
12.18 |
| 1.4 |
12.21 |
| 1.2 |
12.30 |
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