THERMAL ANALYSIS AND MATERIAL CHARACTERIZATION

A leak test device at 20K at 100bar for liquid hydrogen

Transporting and using liquid hydrogen requires new equipment (valves, fittings, pumps, etc.). These components, which come from the aeronautics industry, had been tested at ambient temperature. However, tightness was not guaranteed at the temperature of liquid hydrogen (20K). Some elements used for liquid nitrogen (77K) are currently used in cryogenics. But do they still work […] [Lire la suite]

How can we fight against urban heat islands (UHI)?

Urban heat islands (UHI) result in a significant temperature difference between cities and surrounding rural areas, which can reach up to +10°C, especially at night. This phenomenon increases thermal discomfort, exacerbates health risks during heat waves, and increases energy consumption related to cooling buildings. There are several ways to reduce their intensity:   Increase the […] [Lire la suite]

Parameters that influence UHI: albedo, emissivity, urban canyon effect

  Urban heat islands (UHI) refer to significant temperature differences between city centers and the surrounding rural areas, which are particularly noticeable at night. Understanding the parameters that influence them is necessary in order to better anticipate them and implement appropriate solutions. At THEMACS Ingénierie, we analyze the three major factors that have the greatest […] [Lire la suite]

Possible measures to take action against UHI : albedo, emissivity, and thermal mapping of cities

Understanding and reducing urban heat islands (UHI) requires, above all, accurate measurement of the physical parameters that influence temperature in cities. At THEMACS Ingénierie, we use three complementary approaches: measuring albedo, emissivity, and ground-based thermal mapping.   Measuring albedo   Albedo is the ability of a surface to reflect solar radiation. It is measured on […] [Lire la suite]

What is the SRI (Solar Reflectance Index)?

What is SRI ?   Faced with the challenges of global warming and urban heat islands (UHI), the choice of materials used in large cities plays a very important role. Among the key indicators for measuring their thermal performance, the SRI (Solar Reflectance Index) is now establishing itself as an essential benchmark.   Definition of […] [Lire la suite]

Thermocity: mapping roads to better understand urban heat islands (UHI)

Urban heat islands (UHI) represent a significant challenge for public health, thermal comfort, and energy consumption in cities. In summer, roads, parking lots, and sidewalks contribute significantly to this phenomenon due to their low albedo and high heat storage capacity. To analyze and anticipate these effects, THEMACS Ingénierie has developed Thermocity, a tool specializing in […] [Lire la suite]

What is an urban heat island?

                        An urban heat island (UHI) is an increase in air and surface temperatures in city centers compared to neighboring rural or forested areas, particularly at night. Causes   This phenomenon is due to the way cities are constructed (asphalt, dark roofs, lack of […] [Lire la suite]

An Innovative Method for Measuring the Thermal Conductivity of Composite Materials for Airbus

An Innovative Method for Measuring the Thermal Conductivity of Composite Materials for Airbus   Summary: Thermal characterisation of materials is crucial to ensure their performance and integrity in industrial applications. This document details a study carried out on the thermal conductivity of composites for Airbus. The measurements, carried out by Themacs Ingénierie, aim to determine […] [Lire la suite]

Measurement of the thermal conductivity of epoxy resin in cryogenic conditions for space applications

Summary: Our bench for measuring the thermophysical properties of materials can now measure the properties of composites down to temperatures of 10K. epoxy  resin is widely used in space applications because of its excellent mechanical and dielectric properties. However, to optimise its use in cryogenic environments, it is crucial to understand its thermal behaviour at […] [Lire la suite]

Measurement of the thermal conductivity of copper in cryogenic conditions

Measurement of the thermal conductivity of copper in cryogenic conditions We have begun the first measurements under cryogenic conditions of the thermal conductivity of copper samples. Initial results are conclusive.   Article avalable here : Mesure de la conductivité thermique du cuivre en condition cryogéniques en-GB Principle of the method The method adopted is specific […] [Lire la suite]

Measurements of thermo-physical properties: Presentation at HYVOLUTION 2025

Liquid hydrogen storage : Thermo-physical characterisation of materials at -250°C THEMACS Ingénierie will present a Workshop on the thermophysical properties of materials The storage of liquid hydrogen represents a major technical challenge, requiring an in-depth understanding of the thermophysical properties of materials at extremely low temperatures, often close to -250°C. Hydrogen, as an energy-dense gas, […] [Lire la suite]

Measurement of thermal emissivity

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Dilatometry: Measuring the CTE (coefficient of thermal expansion) from 300 to 20K

Measuring the CTE (coefficient of thermal expansion) from 300 to 20K requires non-contact measurement. [Lire la suite]

Measurement of the thermal resistance of super-insulators for storing liquid hydrogen in cryogenic conditions

In many fields, particularly space and aeronautics, transporting hydrogen in a liquid state is often the only solution. Contact us. [Lire la suite]

Which blackbody should be used to calibrate a pyrometer or a thermal imaging camera ?

For the calibration of our thermal imaging cameras and pyrometers, we use black bodies that we customise to suit our needs. [Lire la suite]

Measurement of thermal emissivity at cryogenic temperatures

THEMACS Ingénierie was present at the largest congress on the thermophysical properties of materials: ECTP-2023. [Lire la suite]

Measurement of thermal conductivity at cryogenic temperatures

THEMACS Ingénierie was present at the largest congress on the thermophysical properties of materials: ECTP-2023 [Lire la suite]

THEMACS at the Service of ESA for Cryogenic Devices

THEMACS was at ESA, the European Space Agency. The European Space Agency trusts THEMACS for devices in cryogenic conditions. [Lire la suite]

Thermal effusivity

Thermal effusivity is a physical property that describes the ability of a material to transfer heat to another material through direct contact. [Lire la suite]

The launch of the ANR RESBIOBAT project took place on March 14 at the Gustave Eiffel University in Champs sur Marne

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Technological implementation of pyrometry

Optical pyrometry is used when the temperature is too high to allow conventional measurement (Pt100 or thermocouples) or when it is impossible to use contact measurement (moving object). [Lire la suite]

Measurements of thermal resistance of a tube NF EN ISO 8497 December 1996 Thermal insulation – Determination of properties relating to steady-state heat transfer in thermal insulation for pipes

We recently carried out standardized measurements to characterize the performance of an insulation system for pipes carrying a fluid. [Lire la suite]

The SRI

The SRI : an indicator to avoid urban heat islands finally recognized by energy saving certificates. [Lire la suite]

Measurement of the thermal conductivity of a glass-epoxy composite at 80K

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Measurement of thermal conductivity by the guarded hot plate method on aluminum honeycomb structures

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Measurement of the thermal conductivity of aluminum samples at low temperature

We have performed the measurement of thermal conductivity of aluminum samples at cryogenic temperatures. [Lire la suite]

Comparative test of the thermal insulation of down jackets

  Two down jackets were tested: one from the K-Way brand and one from the Penfield brand (sleeveless) Two types of tests were carried out: using a heating film placed inside the down jackets; by measuring the losses through the down jackets when they are worn by a person. In both cases, the objective is […] [Lire la suite]

Measurement of thermal emissivity on train axle boxes

Spectral Measurements: The measurements were carried out using an AGILENT brand spectrometer (Figure 1). The spectral band is from 2µm to 15µm. The detector is a DTGS Figure 1: Measurements with the FTIR-4300 infrared spectrometer Measurements of emissivity: Measurements of total directional emissivity are carried out using the emissometer EM2 and EM3. The EM2 emissometer […] [Lire la suite]

Thermal modeling of a track de-icing system

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Emissivity and temperature measurement in the Namib Desert

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Symposium on thermophysical properties

THEMACS Ingénierie were present on the : TWENTIETH SYMPOSIUM ON THERMOPHYSICAL PROPERTIES Boulder, CO, USA June 24–29, 2018 [Lire la suite]

Realization of reflection measurements on different samples

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THEMACS Engineering and EPBD

THEMACS Energy engineering and performance of buildings Plateforme Panisse sous surveillance thermographique [Lire la suite]

Themacs Engineering participates in the 25th French Congress on Thermal Science

Nicolas Lalanne and Jean-Pierre Monchau, from Themacs Engineering, were present at the 25th French Congress on Thermal Science, organized by the Société Française de Thermique (SFT). [Lire la suite]

Emissivity

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Albedo

Albedo is the solar reflectance  coefficient of a surface. This dimensionless coefficient represents  the ability of a surface to reflect sunlight. Principle of albedo measurement [Lire la suite]

Thermal Conductivity

“Thermal conductivity” describes the ability of a material to transfer heat. [Lire la suite]

Thermal Diffusivity

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The EM3 emissometer seen in the press !

The EM3 emissometer, now on sale, has been the subject of an article on the specialized website Mesures.com. [Lire la suite]

The SRI: a crucial indicator for eco-friendly buildings

The Solar Reflectance Index translates the ability of a material to reflect solar heat and exhibit a small increase in temperature when exposed to sunlight. [Lire la suite]

THEMACS at the 21st ECTP in Graz

The ECTP is one of the three most important conferences on thermophysical properties. It was held at the Technische Universität Graz (University of Technology Graz). The prestigious Technische Universität Graz. [Lire la suite]

Measurement of emissivity in Namibia, GOBABEB site

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Complete collection of all works by Y.S.TOULOUKIAN

THEMACS engineering has acquired all of the nearly 20 volumes of the works of the collection directed by Y.S. TOULOUKIAN on the thermophysical properties of materials. Thermophysical properties at high temperature solid materials [Lire la suite]