Question

(a) The exterior wall of a timber-framed house is constructed as follows from the inside out. . Internal surface convective coefficient B W/m°K. 13mm plasterboard k = 0.25 Wimk 1150 mm insulation (k = 0.04 W/mK). making up 85% of the area between 150 mm timber studs (k = 0.13 W/mK).. 12 mm sheathing plywood (k = 0.13 VimK). . A 75mm air cavity of thermal resistance 0.18 m*K/ . 100mm block outer leaf (k = 0.57 Wimkj . 20mm render (k = 0.57 W/mK). External surface convective coefficient 25 W/m°K Taking into account the bridging of the insulation by the timber studs, calculate the overall heat transfer coefficient for the wall (15 Marks) (b) For a building with a perimeter of

          (a)
The exterior wall of a timber-framed house is constructed as follows from the inside out.
.
Internal surface convective coefficient B W/m°K.

13mm plasterboard k = 0.25 Wimk

1150 mm insulation (k = 0.04 W/mK). making up 85% of the area between 150 mm
timber studs (k = 0.13 W/mK)..

12 mm sheathing plywood (k = 0.13 VimK).
.
A 75mm air cavity of thermal resistance 0.18 m*K/
.
100mm block outer leaf (k = 0.57 Wimkj
.
20mm render (k = 0.57 W/mK).
External surface convective coefficient 25 W/m°K
Taking into account the bridging of the insulation by the timber studs, calculate the overall heat transfer coefficient for the wall
(15 Marks)
(b)
For a building with a perimeter of

Added by Katie C.

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