Our achievements tell the story of how we learned to surpass our limits
Human knowledge: learning, sharing, and progressing
Discover how Knowledge Management enhances human experience, sharing, and continuous learning to transform individual knowledge into lasting collective success.
Knowledge is, above all, human
The true wealth of Knowledge Management lies in human experience, intuition, and each individual’s memory.
Share to grow
Sharing transforms individual knowledge into collective capital, strengthening personal skills and the overall performance of the organization.
From experience to formalization
Analyzing, documenting, and organizing knowledge allows us to use the past to effectively guide future decisions.
Continuous learning, the engine of innovation
Continuous learning allows us to build on experience, strengthen skills, innovate, and make progress despite obstacles or unfinished projects.
One day, someone told me:
"Julien, tu le sais, tu as une différence. Et cette différence sera ta force un jour."
Today, I know those words were true. My difference has become my greatest strength the one that drives me to move forward, to create, and to never stop learning.
Lyon, 22 years old
Improved data accuracy for tomorrow
By using Monte Carlo simulation and more reliable measurements, the EER is better controlled (±0.7%), ultimately ensuring increased accuracy of selection software.
More precise metrology and regulation
- Optimization of measuring devices (pressure sensors, wattmeters, flow meters…).
- Reduction of EER uncertainty to ±0.6–0.7%.
Innovation in compressor degassing
- Development and testing of an ultrasonic degassing process.
- Less refrigerant loss (787 kg/year avoided).
- Economic gains (~€9,600/year) and significant reduction in CO₂ emissions.
From the history of calorimeters to technical innovation
Analysis of the evolution of calorimeters and their impact on energy performance, fire safety, and compliance, applied to the R&D of compression systems.
History and scientific evolution
- Over 200 years of scientific development, from Lavoisier to modern technologies.
- Major contributions to the understanding of heat transfer.
Energy performance of compressors
- Optimization of systems capable of achieving up to 30% energy savings.
- Importance of calorimetric measurements for operational efficiency.
Fire safety
- Accurate measurement of heat flow to prevent risks.
- Key role in the safe design of systems.
Compliance and international standards
- Compliance with UL, ISO, and CE standards.
- Ensuring worldwide reliability and market acceptance.
New fluids, new performance: innovating for the energy transition
Development of simulation software to optimize compatibility between compressors and calorimeters, validated through real-world testing and designed to enhance energy performance evaluations.
Smart simulation for precise testing
- Development of software to select the most suitable calorimeter for each compressor.
- Validation through real-world testing, ensuring reliability and energy efficiency.
Innovation for environmental sustainability
- Adaptation to new refrigerants to reduce environmental impact.
- Continuous improvement of testing procedures for a more sustainable industry.
What are the environmental consequences of refrigerant leaks?
The study analyzes the degradation of HFCs and HFOs and the formation of TFA. HFOs, being more environmentally friendly, show minimal environmental impact, confirming their key role in the sustainable energy transition.
Study context and objectives
- Refrigerants (HFCs, HFOs) are essential, but their leakage contributes to global warming.
- The study aims to understand their atmospheric degradation pathways and the formation of trifluoroacetic acid (TFA).
Regulations and emission trends
- Reduction of refrigerant emissions (from 19% in 2000 to 10.1% in 2021).
- Transition to low-GWP fluids (HFOs), encouraged by European regulations (F-Gas, 2024).
Natural TFA cycle
- TFA occurs naturally in water and soils.
- Degradation of HFOs may slightly increase its atmospheric and aquatic concentrations.
Atmospheric degradation
- Key processes: photolysis, hydrolysis, and reactions with OH radicals.
- Comparative studies on HFC-134a, HFO-1234yf, and HFO-1234ze(E).
Experimental results
- HFC-134a: partial conversion (29–36%) into TFA.
- HFO-1234yf: almost complete degradation into TFA.
- HFO-1234ze(E): more complex transformation, with 75% converted through multiple steps.
Overall environmental impact
- TFA production from HFOs is very low compared to natural stocks.
- 76.8 tons of TFA over 100 years (negligible increase of 3.07 × 10⁻⁷%).
Scientific discussion
- Debates on the secondary formation of HFC-23 from trifluoroacetaldehyde (contradictory results).
- Further experimental studies are needed to clarify these mechanisms.
Extraction of pharmaceutical molecules with supercritical CO₂: detailed modeling of thermodynamic properties near the critical point
New experimental measurements on the CO₂/ethanol system have provided unprecedented density data near the critical point. These results complement the existing literature and improve the understanding of thermodynamic properties.
Experimental tests:
- High-precision density measurements performed using an Anton Paar DMA HPM vibrating-tube densimeter.
- Study conducted on pure CO₂ and CO₂–ethanol mixtures at low ethanol concentrations (wCO₂ = 0.99 and 0.98).
- Experimental conditions: temperatures between 303 and 313 K and pressures ranging from 5 to 10 MPa.
- These experiments provide new data to better characterize the behavior of supercritical CO₂ and its mixtures near the critical point.
Contribution of new data:
- The newly obtained density values complement the existing database for CO₂/ethanol systems with low ethanol content.
- They provide unprecedented information in the critical region, which is essential for a detailed understanding of thermodynamic properties.
- These data improve prediction accuracy and support the development of more efficient and environmentally friendly extraction processes using supercritical CO₂.
Characterization of sustainable working fluid mixtures in industrial refrigeration systems: a performance strategy through the lenses of environmental impact, thermodynamic properties, and refrigeration machine selection
Characterization of sustainable fluid mixtures for industrial refrigeration: using a vibrating-tube densimeter, generating experimental data, Helmholtz modeling, and ASPEN© simulations.
1. Design and assembly of a setup with a vibrating-tube densimeter to accurately measure densities and bubble points.
2. Generation of new experimental data for densities and bubble points.
3. Thermodynamic modeling (Helmholtz) recalibrated based on the new data to better represent mixture behavior.
4. ASPEN© simulations incorporating the actual geometries of heat exchangers to evaluate various application scenarios.
5. Preliminary results highlight the impact of mixture glide on energy performance.
6. Simulations indicate improvements in COP and refrigeration capacity.
7. Advances achieved: improved understanding of the role of additional molecules, energy optimization, and model refinement.
Research and development in modeling fluid-oil mixtures
Design and modeling of new Daniel diagrams to visualize binary and ternary vapor–liquid equilibria, enhancing the thermodynamic understanding of the system.
Binary Daniel diagram design
- Creation of a new Daniel diagram illustrating the vapor–liquid equilibrium between two components.
- Accurate representation of thermodynamic interactions.
- Validation of results using the developed computational model.
Extension to ternary diagram
- Development of a second Daniel diagram incorporating a third component.
- Visualization of liquid–vapor coexistence regions.
- Improved understanding of the overall behavior of the mixture.
Poster presentation at IIF 2023
Energy optimization of a refrigeration machine using a Drop-In fluid: ASPEN© simulation and performance analysis to improve efficiency and reduce environmental impact.
Poster presentation at IIF 2023: Simulation of the Cooling Machine for the Drop-In to Improve Energy Performance.
Study of energy optimization of a refrigeration machine using a new Drop-In fluid and thermodynamic simulation with ASPEN©.
Presentation at the RPF 2024 Conference, Lyon
Analysis of HFC/HFO degradation and TFA formation: HFOs are more environmentally friendly, with low environmental impact, confirming their role in the energy transition.
Presentation at RPF 2024: Analysis of HFC and HFO degradation and TFA formation.
Study on the environmental impact of HFOs, identifying atmospheric degradation pathways and evaluating TFA production to support a sustainable energy transition.
