Technology
How EW JET Heat Pipes Work
A heat pipe is one of the most efficient thermal devices known to physics — capable of transferring heat across meters with almost no temperature drop. EW JET's innovation lies in how we manufacture them: using 3D-printed wick structures and aluminum extrusion to achieve geometries and performance levels that conventional processes cannot.
The physics of phase-change heat transport
Inside every EW JET heat pipe, ammonia (NH₃) cycles continuously between liquid and vapor states. At the hot end — attached to a processor, power amplifier, or satellite panel — liquid ammonia absorbs heat and vaporizes. The vapor travels through the pipe core to the cool end, where it condenses back to liquid and releases its stored heat. Capillary forces in the wick structure then draw the liquid back to the hot end, sustaining the cycle indefinitely with no moving parts and no power input.
The result is an effective thermal conductivity of 15,000 W/mK — roughly 37 times that of solid copper — at a fraction of the weight. For satellite thermal engineers working against strict mass budgets, this is the fundamental trade that makes heat pipes indispensable.
Ammonia was selected as the working fluid because of its exceptional thermodynamic properties: high latent heat of vaporization, low viscosity at operating temperatures, and a wide liquid range from −77°C to +132°C. Combined with an aluminum containment system, it delivers superior thermal performance with full compatibility with spacecraft materials and processes.
The wick: where most manufacturers stop short
The wick structure is the heart of a heat pipe. Its job is to generate capillary pressure — the force that pumps liquid from the condenser back to the evaporator without any external power. Conventional manufacturing uses sintered powder or axially grooved channels, both of which impose geometric constraints on what capillary structures are achievable.
EW JET 3D-prints the wick geometry directly into the heat pipe body. This allows us to design and fabricate capillary networks that would be impossible to sinter or groove — higher capillary density, gradient structures, optimized channel cross-sections — and to do so repeatably at production scale.
The practical benefit is higher maximum heat transport capacity for a given pipe diameter, and the ability to produce custom geometries that conform to your thermal interface — rather than designing the satellite around off-the-shelf pipe dimensions.
What 3D printing enables
- Custom capillary geometries not achievable with sintering or grooving
- Higher heat transport capacity per unit cross-section
- Non-circular and non-standard pipe cross-sections for tight integration
- Gradient wick structures — optimized separately at evaporator and condenser
- Shorter development cycle from thermal requirement to prototype
From simulation to flight hardware
EW JET's manufacturing chain is integrated end-to-end — thermal simulation, wick design and printing, aluminum extrusion, assembly, and in-house performance measurement all happen under one roof. This compression of the supply chain shortens lead times and keeps engineering decisions close to manufacturing reality.
Thermal Simulation
CFD and thermal network modeling validates heat pipe performance before any hardware is built. We size the wick, pipe diameter, and working fluid charge to meet your thermal requirement.
Wick Design & 3D Printing
Custom wick geometries are designed and printed in-house, with iterative refinement for capillary performance. This step is where EW JET's manufacturing advantage is most visible.
Extrusion & Assembly
The aluminum body is formed via extrusion, cleaned to space-grade cleanliness standards, and assembled with the printed wick and ammonia working fluid under controlled conditions.
Performance Testing
In-house test rigs measure actual heat transport capacity, thermal resistance, and startup behavior — producing the performance data sheet delivered with each unit.
Qualification
Hardware is qualified to ESA/ECSS compliance standards, including thermal vacuum cycling, vibration, and leak testing. Test records are fully documented.
Delivery
Flight hardware delivered with full documentation: thermal performance data, qualification test records, and traceability through the manufacturing chain.
Standards and supply chain
EW JET designs and manufactures to ESA/ECSS compliance standards — the European Space Agency's space engineering framework that governs satellite thermal control hardware. This means our thermal design, material selection, manufacturing processes, and testing procedures follow the same methodology used by leading European and international satellite programs.
EW JET is a qualified supplier to TASA (Taiwan Space Agency), with hardware supplied for TASA flight programs. We are also an AIDC partner and a member of TSIDA (Taiwan Space Industry Development Association).
Our peer-reviewed research on 3D-printed wick heat pipe technology has been published at international heat transfer conferences. We continue to invest in R&D and are developing the next generation of wick geometries and PCM thermal storage systems.