TEMISTH SAS

Their core work

TEMISTH is a French SME based in Marignane specializing in the design and optimization of advanced heat exchangers, particularly for aerospace and energy applications. They combine additive manufacturing techniques with computational fluid dynamics and multi-physics simulation to create high-performance thermal management components. Their work spans from aeronautic cooling systems using lattice and topological optimization to compact heat exchangers for refrigeration and solar-powered desalination systems.

What they specialise in

How they've shifted over time

TEMISTH began (2018-2019) with a strong aerospace-focused agenda — additive manufacturing of heat exchangers, topological optimization, and CFD simulation for aeronautic cooling. By 2020-2023, their focus broadened from pure aerospace thermal management toward compact heat exchangers for refrigeration and, most notably, into energy applications with solar-powered desalination and supercritical CO2 cycles. This evolution shows a deliberate pivot from aerospace-only thermal engineering toward cross-sector energy and environmental applications, using the same core AM and heat transfer competencies.

TEMISTH is extending its aerospace thermal engineering expertise into clean energy and water treatment — expect future work at the intersection of advanced manufacturing, concentrated solar power, and industrial heat recovery.

How they like to work

TEMISTH operates exclusively as a participant, never as coordinator, which is typical for a specialist SME contributing deep technical expertise to larger consortia. With 27 unique partners across 14 countries from just 4 projects, they work in sizeable, internationally diverse consortia — averaging nearly 7 partners per project. This suggests they are a sought-after technical contributor that larger organizations and research institutions bring in for specific heat transfer and AM simulation capabilities.

Despite only 4 projects, TEMISTH has built a broad network of 27 partners across 14 countries, indicating strong international reach and a non-repetitive partner base. Their collaborations span Western and Southern Europe with connections into the Clean Sky and other Joint Technology Initiative ecosystems.

What sets them apart

TEMISTH occupies a rare niche at the intersection of additive manufacturing and thermal-fluid engineering — they don't just design heat exchangers, they optimize them using AM-specific techniques like lattice structures and topological optimization combined with CFD. Their Marignane location (home to major aerospace industry) and progression from aerospace into energy applications makes them a versatile thermal engineering partner. For consortium builders, they bring a proven ability to translate AM heat exchanger expertise across sectors — from aircraft cooling to solar desalination.

Highlights from their portfolio

• DESOLINATION
  Their largest project (EUR 773K) and a significant sector pivot — applying heat exchanger expertise to concentrated solar power and desalination, running until 2026.
• NATHENA
  Foundational project establishing their core identity: additive manufacturing of heat exchangers for aeronautics with multi-physics simulation and topological optimization.
• PANTTHER
  Second-largest funding (EUR 590K) bridging aerospace and industrial applications through multiscale multiphase compact heat exchanger research.