Chapter 7 External Forced Convection7-81The thickness of flat R-8 insulation in SI units is to be determined when the thermal conductivity of the material is known. AssumptionsThermal properties are constant. PropertiesThe thermal conductivity of the insulating material is given to be k= 0.04 W/m⋅°C. R-8 L Analysis The thickness of flat R-8 insulation (in m2.°C/W) is determined from the definition of R-value to be RLkLR kvaluevalue2m . C / W)(0.04 W / m. C)=→==°°=(80.32 m7-82EThe thickness of flat R-20 insulation in English units is to be determined when the thermal
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