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...
View
Full Document
 Fall '10
 Dr.DanielArenas
 Thermodynamics, Resistance, Mass, Heat, Heat Transfer, Thermal conductivity, Steady heat conduction, thermal conductivities

Click to edit the document details