Heat Pipe Performance: thermosyphon
Heat pipe performance data — cylindrical, vapor chamber, loop, micro, and thermosyphon types with various working fluids and wick structures
| heat pipe type | sk | application | diameter mm max | effective conductivity WmK max (W/mK) | effective conductivity WmK min (W/mK) | length mm typical | max heat flux Wcm2 (W/cm2) | max heat transport Wm (Wm) | notes | operating temp high C (C) | operating temp low C (C) | orientation effect | thermal resistance CW max (C/W) | thermal resistance CW min (C/W) | wick type | working fluid |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| thermosyphon | ammonia#wickless#max50mm | cryogenic refrigeration, polar electronics, permafrost applications | 50 | 40,000 | 10,000 | 1,000 | 80 | 800 | Ammonia thermosyphon used in permafrost cooling (pipeline supports); long transport lengths; gravity-driven; used in Trans-Alaska Pipeline and Arctic infrastructure | 100 | -60 | gravity_dependent | 0.12 | 0.03 | wickless | ammonia |
| thermosyphon | methanol#wickless#max30mm | cold-climate electronics, outdoor cabinets, agricultural instrumentation | 30 | 30,000 | 8,000 | 400 | 50 | 400 | Methanol thermosyphon for sub-ambient to 130C; filling ratio critical; copper or stainless envelope; simpler than wicked for non-critical orientation applications | 130 | 10 | gravity_dependent | 0.2 | 0.05 | wickless | methanol |
| thermosyphon | water#wickless#max50mm | data center cooling, industrial waste heat recovery, geothermal, HVAC | 50 | 80,000 | 20,000 | 500 | 100 | 1,000 | Two-phase closed thermosyphon (TPCT); condenser must be above evaporator; gravity drives liquid return; 3x greater heat transport than wicked HP; simple construction; 53mm ID x 92m long propane thermosyphon carried 6 kW in literature; filling ratio 40-70% optimal; widely researched 2020-2025 | 200 | 30 | gravity_dependent | 0.15 | 0.03 | wickless | water |
This is a sample. Search the full heat pipe performance dataset and 300+ more by creating a free account and accessing the database.
Get started for FREE