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A wall panel is to have the following: Outer metal sheeting, foamed polyurethane board, air gap and 15mm of lining board. The relevant value of thermal conductivity in w/mk are:
1) polyurethane board 0.025
2) lining board 0.16
3) (metal sheet is ignored)
The standard thermal resistances, in m�k/w are: outside surface 0.06, inside surface 0.12, air gap 0.18. calculate the minimum thickness of polyurethane needed to give the wall panel a U value of 0.35w/m�k.
1) polyurethane board 0.025
2) lining board 0.16
3) (metal sheet is ignored)
The standard thermal resistances, in m�k/w are: outside surface 0.06, inside surface 0.12, air gap 0.18. calculate the minimum thickness of polyurethane needed to give the wall panel a U value of 0.35w/m�k.
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