Euro heat pipes (EHP) on-board of SES-17 satellilte

The SES-17 satellite was successfully launched into space onboard an Ariane 5 launcher operated by Arianespace from the Europe’s Spaceport in Kourou on October 23rd 2021.


Built by Thales Alenia Space, SES-17 marks an important milestone in satellite technology as the first Ka-band geostationary satellite to embark a fully digital payload powered the most powerful digital transparent processor (DTP) ever placed in orbit.


This satellite is equipped with the first ever Mechanically pumped Loop (MPL) to be mounted on a telecommunication satellite!

The MPL is made of a network of pipes and a mechanical pump, which circulates a refrigerant fluid to collect heat wherever it is created and transport it to the radiators. This makes it possible to maximise use of the available surface inside the satellite, to accommodate the repeaters required for large Very High Throughput Satellite missions.


EHP is proud to have contributed to the development and to have supplied this new generation of heat exchangers.


Euro Heat Pipes (EHP) on-board of the 11th OneWeb launch

OneWeb Launch #11 (Flight ST36) is scheduled to depart 14 October at 6:40pm local time (5:40am ET / 9:40am UTC), with 36 satellites on board and marks one of the most exciting advances yet for OneWeb’s global communications network.

The launch will take place from the Vostochny Cosmodrome and will be conducted by Arianespace. You can view the Launch #11 event live on the website, or @oneweb – Youtube.

Each of these satellites includes several EHP heat pipes, designed & manufactured within our premises in Nivelles, Belgium.

Our fully-passive heat pipes, equipped with a capillary structure and filled with high-purity ammonia, are a key part of the satellite thermal control.

The dual phase system enables the satellite & the payload to remain within a limited temperature range, despite the very harsh space environment.

Video of the launch preparation activities:

Pictures of the launch preparation activities:

La grappe de satellites OneWeb accrochés à leur dispensaire.

Credits for pictures & video to the full article :

OneWeb : Mission accomplished !

[In French below]

OneWeb : Mission accomplished !

In 2016, the OneWeb project started a new era for EHP with the manufacturing of several thousands of heat pipes within a timeframe of a few years.

In July 2021, 5 years later, EHP celebrated the last shipment of this contract. Mission accomplished!

– the several thousands of heat pipes have been manufactured and 40% of them are already in orbit.

– heat pipes production at EHP has been transformed: while around 100 items were manufactured on a yearly basis before the OneWeb project, yearly production reached 3000 items. This high level of production is ensured for the next years through new contracts.

– new infrastructure have been developed and a new factory is under construction.

– EHP became one of the world leaders of space-application heat pipes and has significantly increased its market share.

Regarding the OneWeb constellation:

OneWeb is a constellation of 648 telecommunication satellites orbiting in low earth orbit (1200 km) to supply from 2022 onwards a high-speed internet for private and commercial customers in non-land serviced regions.


OneWeb : Mission accomplie !

En 2016 commençait une nouvelle page pour EHP avec le lancement du projet OneWeb, pour la fabrication de milliers de caloducs en quelques années.

En juillet 2021, 5 ans plus tard, EHP célèbre la dernière livraison du contrat. Mission accomplie !

– les milliers de caloducs ont été fabriqués et livrés et 40% d’entre eux sont déjà en vol.

– la production de caloducs chez EHP a été industrialisée, en passant d’environ 100 caloducs par an avant 2015, à 3000 caloducs par an aujourd’hui. Ce niveau de production est assuré pour les années à venir via de nouveaux contrats.

– de nouvelles infrastructures ont été développées et une nouvelle usine est en cours de construction.

– EHP est devenu un des leaders mondiaux de la production de caloducs pour l’industrie spatiale et a su accroitre considérablement ses parts de marché.

Concernant la constellation OneWeb :

OneWeb est une constellation de 648 satellites de télécommunications circulant sur une orbite basse (1200 km) pour fournir aux particuliers et aux entreprises, à partir de 2022, un accès Internet à haut débit via satellite, en particulier dans les régions non desservies par des liaisons terrestres.


Photos : Cedric MURI

Euro Heat Pipes on its way to the North Pole!

Source :


OneWeb, the Low Earth Orbit (LEO) satellite communications company, will launch 36 satellites (EHP Heat Pipes onboard) on Thursday, 1 July 2021, marking the completion of its ‘Five to 50’ ambition enabling connectivity services for the first time to the 50th parallel and above by the year end.

Each of these satellites includes a set of several heat pipes manufactured by Euro Heat Pipes in Belgium. This new launch will bring the total number of in-flight satellites to 254.

Service demonstrations will begin this summer in several key locations – including Alaska and Canada – as OneWeb prepares for full commercial service in these regions in the next six months. Offering enterprise grade connectivity services, the company has already announced distribution partnerships across several industries including with ROCK Networks, AST Group, PDI, Alaska Communications and others, as OneWeb expands its global capabilities. The company continues to engage with telecommunications providers, ISPs, governments and more worldwide to offer its low latency, high speed connectivity services and sees growing demand for new connectivity services to connect the hardest to reach places.


This launch adds another 36 satellites to OneWeb’s 648 LEO satellite fleet that will deliver global connectivity and represents 100 percent of the satellites required to enable its solution to reach all regions north of 50 degrees latitude.

This launch will enable OneWeb to offer full connectivity services across the United Kingdom, Alaska, Northern Europe, Greenland, Iceland, continental U.S., the Arctic Seas and Canada. Commercial service is expected to be rolled out before the end of the year, and OneWeb intends to make global service available in 2022.

To mark the fifth and final launch of ‘Five to 50’, with all satellites delivered on time, a welcome message “Hello North Pole” is branded on the rocket, reflecting the significant progress OneWeb has made to secure its Arctic coverage.

Why the Arctic?


The launch is scheduled to take place on 1 July 2021 at 13:48 BST / 8:48 AM ET / 4:48 AM Alaska / 12:48:33 UTC / 9:48 Vostochny.


The launch will take place from the Vostochny Cosmodrome and will be conducted by Arianespace.

How to watch:

Livestream available on the following channels with programming beginning at 13:30 BST/8:30 ET/ 12:30 UTC.




Construction of ‘New EHP’

2021 will remain a particular year for EHP…

Besides celebrating the 20 years of EHP, this year also marks the beginning of the ‘new EHP’ !

Over the years, EHP has grown from a small 600m² facility to working areas spread over 4 buildings for a total of 4500m².

Enough ? Not at all ! With the major OneSat project arriving, and with our heat pipe production continuing to double every year, EHP needs much more space.

In 2019, the idea of a new modern building was put on the table. Two years later, in May 2021, the work of a brand new 10 000m² facility has begun !

By the beginning of 2023, EHP will have close to 8000m² of industrial areas, including a 2000m² clean room for the assembly of our thermal and deployable systems. Our teams will also be reassembled together in a nice 2000m² office building that will offer a well-being working environment to all of us.

The first part of the project, the industrial hall and half of the clean room, should be delivered in the beginning of 2022. The offices and the rest of the clean room should be available 6 months later, and the final industrial areas for machining and logistics will close the project in the beginning of 2023.

With these new facilities, EHP is now ready for the next 20 years !

Novel system de-ices aircraft using engine heat

Most aircraft de-icing systems have to generate power for the heaters. A new alternative efficiently draws heat from the engines.

The formation of ice on aircraft is both commonplace and dangerous. An ice layer on wings and control surfaces can change their shape, potentially affecting the pilot’s control of the aircraft. Ice also adds weight.

Under certain conditions, usually at fairly low altitudes, so-called icing-clouds can contain droplets of water that remain liquid despite their temperature being below freezing. Upon contact with any solid surface, the droplets instantaneously freeze onto the surface. A thick ice layer can form in just seconds. This can be extremely dangerous for small aircraft, which must avoid such clouds completely. Larger aircraft carry de-icing systems.

The main types heat the wing and the engine air intake, via either electric elements or a hot-air system. Although such systems work reliably, they are very energy-hungry, consuming up to 40 % of the total power the aircraft produces. Any reduction in energy consumption would mean significant financial savings for the aircraft operator.

Putting waste heat to use

The EU-funded PIPS project developed a new kind of heating system. Instead of generating heat at great cost, the system transfers waste heat from the engines to the engine air intake. Thus it is highly efficient. The system is initially intended for the air-intake part of medium-sized turboprop aircraft.

However, it could eventually be adapted to any aircraft having hot engines near the wings, meaning virtually any aircraft. The patent-pending system is called Capillary Pumped Loop. “This is a closed circuit in which circulates a fluid – methanol – which is always at saturation,” explains project coordinator, Romain Rioboo. “That means it’s always around the point of phase change between liquid and vapour.”

The engine supplies heat to the evaporator, which evaporates the liquid. Gaseous methanol circulates to the condenser, where it returns to liquid, releasing heat. The liquid circles back to the evaporator via a capillary wick, which is a passive pump. The physics of the phase change between liquid and gas means that the liquid can absorb and transport a large amount of heat.

So the system is very efficient, using engine heat that would otherwise be wasted. This saves having to generate large amounts of heat as in conventional de-icing systems.

Good progress so far

The project has achieved technology readiness level 5. The concept has been demonstrated, but the technology still needs some refinement. Researchers initially planned to use off-the-shelf components. However, problems encountered along the way required design of a completely new system.

This was successful but caused delays. “We have yet to change the condenser design to improve heat distribution on the surface of the engine intake,” adds Rioboo, “and test the change before envisaging flight tests.” However, in laboratory and icing wind tunnel testing, the project achieved effective heat transfer in a full-size model engine setup and transported up to 10 kilowatts of heat under icing conditions.

This exceeds the requirements for a de-icing system. Further development is uncertain. If that takes place, the outcome will be a cheap and efficient aircraft de-icing solution.


PIPS, aircraft, de-icing, system, heat-exchange, Capillary Pumped Loop, methanol

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20 years in space !

EHP is celebrating its 20th Anniversary !

Based on SABCA’s Two-phase departement and the impulse of Pr. Jean-Claude Legros of the Université Libre de Bruxelles, EHP’s was born on the 30th of March 2001 with the vision to conquer the enormous potential of Two-Phase technology in space applications.

With the addition of more than 20 years of SABCA’s knowledge and heritage, EHP boasts at least 40 years of experience and expertise.

Today, as a subsidiairy of Airbus Defence & Space and the support of the SRIW and SOGEPA, EHP is the European leader for the delivery of cooling solutions for space applications.

With its EN9100 certification and decidated in house facilities, we have expanded the product porfolio to 3 major product branches :

  • Heat pipes (CCHP & VCHP)
  • Thermal Systems (using loop heat pipes)
  • Deployable Systems

In its 20 years of history, EHP has grown to become in 2021 a company employing close to 100 highly skilled people.

In the next year, we hope to share with you a piece of this history with a monthly bulletin.

And of course, we will be rocking our new logo until March 2022 !

PIPS & I3PS Project

The EU funded projects PIPS and I3PS targeted the energy saving of planes, within the Cleansky 2 research program, by developing a new anti-icing system.

Both projects enabled to develop a new technology (PIPS) and to test it under relevant environment (I3PS).

This new concept uses wasted heat from the engine to bring it to the Engine Air Intake zone of turbo propeller planes which must be protected against icing.

The project PIPS developed a new system of Capillary Pumped Loop (CPL, patent pending) to be used to protect against icing the engine air intake of a mid size turboprop aircraft using hot air as heat source.

The system was tested in laboratory with a 1:1 scale model (TRL4) showing heat transport capability exceeding the requirements (7.2 kW transport weighting less than 10kg). Able to adapt to various flight situations, the CPL is automatically controlled and almost completely passive as it spends less than 2% of the transported heat for this.

Within the frame of the I3PS project, the concept was modified to integrate the condenser within the skin itself of the Engine Air Intake. Finally, the prototype was tested for the first time in an Icing Wind Tunnel. With an icing air from ambient to -30°C and airspeed from 0 to 80m/s, the concept was able to transport up to 8.8kW and showed the potential for use as ice protection (test showed that high accretion areas needed a fine detail which was not possible to finish during the project).

With the unique possibility of controlling the working temperature of the fluid in the system loop, independently of the hot source, the concept is validated in a relevant environment and adaptable to many applications.

Another great capillary pumped loop made by EHP !

Eurostar Neo Deployment and Pointing System Achieves Qualification

The Eurostar Neo Deployment and Pointing System, developed by Airbus Defense and Space (F) and Euro Heat Pipes (B) in the frame of ESA’s Neosat Partnership Project, is qualified and ready for flight.

The new Airbus Defense and Space Eurostar Neo satellite product line offers one of the largest communication payload capacities on the world market. This is in particular enabled by the Deployment and Pointing System which repositions the electric thrusters throughout the mission to optimise system performance.

The Deployment and Pointing System, developed by Airbus Defense and Space (F) and EHP (B), under test in Airbus Toulouse facility (Image credit: Airbus Defense and Space)

Qualification testing of the Deployable and Pointing System has recently been completed, covering all aspects of environmental, functional and performance requirements, including hold-down, release, and arm deployment sequences. In-orbit validation is planned in 2021, on-board the first Eurostar Neo mission.

Fourteen Neosat satellites have now been ordered, demonstrating the high economic impact of ESA’s Partnership Projects, which also foster the development of sustainable end-to-end systems up to in-orbit validation.

The objective of the Neosat Partnership Projects is to develop and qualify the next generation platforms allowing the two European satellite prime integrators, Airbus DS and Thales Alenia Space (TAS) to deliver competitive satellites for the commercial satellite market. The projects include development up to in-orbit validation of the new platform product lines for both Prime contractors, Eurostar Neo for Airbus DS and Spacebus Neo for Thales Alenia Space.

Neosat is part of ESA’s Advanced Research in Telecommunications Systems (ARTES) programme and is based on a cooperation between ESA and CNES.

Source :

3D printed capillar connections for heat pipe networks


On telecommunication applications, the Heat Pipes are used in different ways. They can collect heat from several dissipative equipment in order to either spread the heat over large radiator panel or transport heat from hot area to cold area.

Use of Direct Manufacturing technology for manufacturing heat pipes is not foreseen to improve mass or cost at piece part level. The improvement will come from an optimization between the Heat Pipe heat transport capacity and the Heat Pipe heat transfer performance. A large amount of Heat Pipes are used to transfer efficiently heat through the spacecraft. There are several ways to dissipate heat from spacecraft internal equipment’s using heat pipes. The objective of this project has been to study and develop a heat transfer technology based on Heat Pipes and the benefits of direct manufacturing technology in order to improve the standard HP performances and improve heat collection, heat transport and heat spreading. The proposed concept has been implemented in a representative configuration of dissipative payload mounted on inner spacecraft floor which reject its heat to the radiator walls.


The main challenges were:

  • to identify the main requirements and potential benefits of the new technology;
  • to define the new product: Additive Layer Manufacturing (ALM) Heat Pipes (HP);
  • to bind the ALM parts and extruded HP parts;
  • to quantify the advantage of these newly combined HP system which integrate ALM parts in classical HP;
  • to identify possible applications of this improvement.


The newly assembly:

  • Enables much larger interface between heat source and the HP as it incorporates spreader capabilities;
  • Reduce dimensions in case of non-linear HP;
  • Has better thermal performance than classical HP (overall conductivity);
  • Enables more complex designs of heat transfer systems.


The product tested are two different configurations of linking between classically extruded HP and ALM HP which are compared to classical HP linking. The larger linking part between these new types of HP made by ALM and classical HP, enables larger heat exchange surface area. This explains the large benefit in terms of thermal performance. The additive manufacturing technique enables to design the ALM HP with much more possibilities: it removes some limitation due to the extrusion technique.

System Architecture

Three architectures were tested which involves 3 inline HP each:

  • 3 classically extruded HP;
  • 2 extruded in parallel at hot source, 2 at cold sink and 1 larger ALM linked HP in between;
  • 1 extruded in parallel at hot source, 1 at cold sink and 1 larger ALM linked HP in between;


The following main stages have been successfully run:

  • Literature survey;
  • Technical requirement;
  • Material and process test;
  • Trader-off;
  • Design;
  • Manufacturing Engineering Model (EM);
  • EM test;
  • EM results correlation;
  • Proposal for further work.

Current status

At the end of the project, concept of ALM HP have been successfully demonstrated to be useful and highly performant. The partners have benefit from a significant gain in ALM process knowledge that will enable short term consideration of this technology on flight opportunities.

Additional development activities must be performed in order to finalize some processes essentially in terms of design to costs aspects.

Several ongoing projects are looking intensively on this technology to be baselined in the thermal / mechanical architecture of the platform and / or instrument.

The actual TRL level is of 5.

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