Good afternoon all,I'm trying to analyze a polycarbonate wall system that is composed of two layers of hollow polycarbonate with an air gap in between but the results I am getting do not make sense to me. The U-Value of the polycarbonate is 0.023 Btu/hr-ft-F, but the result I am getting from Window7 for the wall is 0.075 Btu-in/hr-ft2-F. I haven't analyzed this material before but I was expecting to get a lower value for the system than for a single layer of the material. I've attached my analysis, any thoughts?
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