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Solid aluminum sim vs test
Posted: 29 Apr 2005 03:57 PM |
I am hoping to pole sim labs and test labs to see if anyone else is seeing a trend that we have noticed since NFRC instituted the radiation enclosure in the Therm 5 program. Previous to the radiation enclosure the trend was that the physical test was "Better" than the simulation(Lower U-factor) for solid aluminum products. Since instituting the radiation enclosure, the physical test is "Worse" than the simulation (Higher U-factor). Going back through samples that we had access to both the sim and the test shows that the difference diverges as the U-factor goes higher. This is particularly a "problem" with the large profile curtain walls. Has anyone else seen this trend? It has gotten to the point where some samples are not validating. The latest sample contained a 0.098 emissivity glass, and a 0.540" air filled gap. It has about 8" deep solid aluminum extrusions. Results were, Us = 0.86, Ust = 0.80, Sim = 0.65
If we indeed have a problem, it is important that we find it now, prior to getting too far along in the Non-res component program. |
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