The EVAL project aims to create a demonstrator of passive cooling system,
based on a loop heat pipe (LHP) technology, for efficient thermal management of the UHBR engine bleed system
valves exposed to harsh temperature environment.
Being a part of the leading technical University,
the Department of Aerospace Thermal Engineering has deep background in aerospace thermal
engineering, modelling and designing of complex thermal engineering systems. In the EVAL the
KhAI leads project technical activities and is responsible for LHpa-based demonstrator design,
manufacturing and testing.
Allatherm is an SME company with key specialization
in two-phase heat transfer technology and devices. Thanks to its profound background and
complete in-house package of equipment and special-purpose machinery for LHPs and HPs production,
in the project the company will design the high-temperature LHP and will manufacture 2 LHPs
for further tests.
STCU is an intergovernmental organization which core
activity is to manage technical projects. It provides project coordination and administrative
monitoring of the proper implementation of project activities.
Liebherr-Aerospace Toulouse SAS has complete capability
to develop, supply and service all aircraft and engine air systems: from the engine bleed air
ports and engine pneumatics to the air distribution in the cabin and from the wing ice protection
system to the cabin pressurization. The systems are supplied for all kinds of platforms like
commercial aircraft, regional aircraft, business jets, helicopters, UAV’s, fighters or military
The project aims to build a cooling solution based on a loop heat pipe
(LHP) – a robust, miniaturised, two-phase heat transfer device, considered to be especially useful for the electronics,
aviation and spacecraft industries.
The innovation of the EVAL cooling solution consists in combination of:
working fluids able to meet the bleed system valve cooling requirements
and aeronautical standards;
Allatherm’s patented technology of evaporator-reservoir modular unit (ALTOM),
which makes possible to create superior in thermal performance, coma-pact, lightweight, robust, reliable,
easy-to-integrate and still cost-effective thermal management systems;
innovative technology of LHP charging on-site
The key advantages of the EVAL approach over the active two-phase cooling system:
Minimal weight no heavy components like pump
Compact and flexible design
ALTOM multiple evaporator-reservoir-condenser design can be easily adapted to UHBR environment
High reliability confirmed by many applications
Zero power off-take 100% passive system
EVAL is funded by the
Clean Sky 2 Joint Undertaking.
The CS2 Topic Manager is Liebherr, the leading EU manufacturer of thermal management systems for aerospace
field. After the project completion Liebherr will integrate EVAL demonstrator (to be supplied by the consortium)
into a real UHBR engine demonstrator to launch further testing in “target environment” in the frame of the Large
Passenger Aircraft IADP activities of the Clean Sky 2 JU.
The EVAL innovative passive cooling system will enable reliable and efficient
long-term operation of the UHBR engine within the next generation of European passenger aircraft. With the
demonstration of its solution, EVAL will contribute to the high-level impacts expected by the Clean Sky 2 Programme.
The Project Contacts
Project Technical Leader
Prof. Pavlo Gakal
Head of Department Aerospace Thermal Engineering department (205)
National Aerospace University “KhAI”