Unformatted text preview: a unit surface area ( A = 1 ft 2 ). Then the Rvalue of insulation of the wall becomes equivalent to its thermal resistance, which is determined from. F.h/Btu . ft 21.66 2 ° = + × = + = ° = ° = = = ° = ° = = = = 83 . 20 417 . 2 2 F.h/Btu . ft 83 . 20 F) Btu/h.ft. 020 . ( ft 12 / 5 F.h/Btu . ft 417 . F) Btu/h.ft. 10 . ( ft 12 / 5 . 2 1 2 2 2 2 2 1 1 3 1 R R R k L R R k L R R R total fiberglass sheetrock ( b ) Therefore, this is approximately a R22 wall in English units. 310...
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 Fall '10
 Dr.DanielArenas
 Thermodynamics, Resistance, Mass, Heat, Heat Transfer, Thermal conductivity, Steady heat conduction, thermal conductivities

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