Building thermics

Building thermography - Part 1: The basis

Figure 1 - The three modes of heat transfer on a wall

Figure 2 - Electrical analogy of heat transfer on a wall

Figure 3 - Simplified classical representation of heat transfer on a wall. Inside temperature Ti and outside temperature Te are operating temperatures.

Figure 4 - Case of a real flat wall where each elementary surface is associated with its own parameters

Figure 5 - Planck curves describing luminance as a function of wavelength and blackbody temperature

Figure 6 - Specular reflection

Figure 7 - Non-isotropic diffuse reflection

Figure 8 - Reflection graph and the four types of material

Figure 9 - Thermal camera vocabulary

Figure 10 - Typical LW camera calibration curve

Figure 11 - Thermal framing [&#43; 10; &#43; 50] explained for a camera with a first calibre of - 30 °C to &#43; 62 °C

Figure 12 - Fundamental distinction between measurement and image in thermography. The area occupied by the image is much smaller than the area occupied by the measurement.

Figure 15 - Example of temperature measurement, temperature scale remains in apparent temperatures

Figure 16 - Building loss categories: convective, radiative and exfiltrated air

Figure 17 - Apparent radiative exchange coefficient hrapp as a function of wall temperature

Figure 18 - Representation of Δ-Radiative loss

Figure 19 - Representation of Seid equivalence

Figure 20 - Example of Seid calculation

Figure 21 - Relative uncertainty in wall U-measurement (ISO/WD 9869-2 – Appendix D – 2008-05-30)