International Appliance Manufacturing 2008 - (Page 47) Figure 3: Thermal imaging demonstrates the impact of density and insulation fit on surface temperature Note: These images were obtained by an in-house Certified Thermographer at Lydall’s dedicated Appliance Laboratory. issues such as improper seaming, sagging, and overcompression can wreak havoc on the thermal performance. Figure 3 demonstrates the impact that insulation density and compression resistance have on the surface of a heat source, for example, the surface temperature of an oven. In Figure 3, the effect of seaming is illustrated. The images on the left show the insulation installation, whereas the images on the right show the resulting surface temperature distribution using IR thermal imaging. Image 1 shows two pieces of appLY Mat ®, seamed diagonally, on a hot surface. Image 2 is a thermal image of this arrangement and demonstrates the invisibility of the seam, as well as the uniform reduction and distribution of heat across the surface. For an oven or range application, this is exactly the kind of performance that is necessary. Image 3 shows the installation of a non-Lydall material. In Image 4, the higher temperatures indicated by the areas in white are a result of poor physical characteristics of the insulation and are evident along the seamed area. The impact of density and compression resistance is evident when comparing Image 2 and Image 4. Image 2 shows an overall cooler surface when compared to Image 4, primarily attributed to a higher density material. Additionally, the seam using appLY Mat® is virtually invisible thermally as compared to the non-Lydall material with poor compression resistance, where the seam could result in a “hot spot”. A poorly cut Figure 4: Potential heat paths and heat transfer mechanisms International Appliance Manufacturing 2008 47
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