Measurements of Wall System are typically carried out by an apparatus such as the one described in ASTM C236-89, “Standard Test Method for Steady-State Thermal Performance of Building Assemblies by Means of a Guarded Hot Box [ASTM 1993].” A relatively large (~8 ft² or larger) cross section of the clear wall area of the wall system is used to determine its thermal performance. The precision of this test method is reported to be ~8% [ASTM 1993].
At the Oak Ridge National Laboratory Building Technology Center, the Arxx wall was built and tested in a guarded hot box under steady-state and dynamic conditions under the Blue Maxx wall technology name.
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