Slim heat pipes and slim vapor chambers are the latest in Delta’s high-efficiency heat transfer solutions. Developed for low profile laptops, tablets, and handheld devices, the slim heat pipes and vapor chambers transport large amounts of heat with very small temperature gradients. The pipes have a two-phase heat transfer system using pure, deionized water vapor for continuous and rapid heat transfer, making it the ideal solution for all the latest devices.
Working principle
Delta used groove, sintered powder, fiber, mesh and composite wick structure for different design. As we know, Geometry of mandrel rod is the key to determine the wick geometry. Also for powder, size and shape will effect wick ability. Delta continues to integrate the material study and manufacturing capability.
Slim heat pipe (cross section)
For slim Heat Pipe with sintering powder wick structure, minimum diameter of 5mm flatten to 0.6 mm could be manufactured. And by fiber and mesh wick structure, it can reach to 0.4 mm by flatten diameter of 2mm. Delta is capability of designing and suggesting suitable wick structure for different application.
General design guidelines for ultra slim heat pipe: (bendable, thin, and customized shapes)
| Diameter (mm) | Thickness (mm) | Length (mm) | Heat Capacity |
| 2 | 0.35~1.0 | 50~200 | 3~5 |
| 3 | 0.40~1.0 | 50~200 | 4~7 |
| 4 | 0.5~1.0 | 50~200 | 5~8 |
| 5 | 0.6~1.0 | 50~200 | 6~15 |
| 6 | 0.6~1.0 | 50~300 | 6~30 |
| 7 | 0.8~1.3 | 80~350 | 10~30 |
| 8 | 0.8~1.3 | 80~350 | 15~40 |
| 10 | 1~1.3 | 80~350 | 20~60 |
Ultra slim vapor chamber
For slim vapor chamber, Delta can apply the maximum dimension of 200mm x 200mm, and the minimum thickness of 0.35mm. The VC surface flatness could be controlled within 0.2/100x100 mm2 by diffusion bonding. The surface ΔT should be controlled within 3oC. (Thermal conductivity: k ~ 6000 W/oC-m ).
General design guidelines for ultra slim vapor chamber: (thin and customized shapes)
| Thickness (mm) | Size (Length x Width) |
Heat Capacity With Fan (W) | Heat Capacity Without Fan (W) |
| 0.35 | 100x60 | 4~6 | 3~5 |
| 0.4 | 120x60 | 5~8 | 3~5 |
| 0.5~0.7 | 160x60 | 10~15 | 5~7 |
| 0.7~1.0 | 180x90 | 15~20 | 7~10 |
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