a) With an aid of a well labeled diagram explain the “green house effect” in buildings.
(6 Marks)
(b) State three benefits of thermal insulation in buildings. (3 Marks)
(c) Differentiate between thermal conductivity and thermal conductance of a material.
(4 Marks)
(d) State 2 factors affecting thermal conductivity of a material. (2 Marks)
– (15 MARKS)
(a) Define the term “U” value stating its SI units. (2 Marks)
(b) Define thermal resistance and state 3 types of thermal resistances in a given building.
(4 Marks)
(c) A domestic pitched roof of tiles on felt sacking with a plasterboard ceiling has an existing
u-value of 1.9w/m2k. Calculate the minimum thickness of fibre glass insulation in the
roof space required to give the roof a new u-value of 0.25w/m2k. The thermal
conductivity of the fibre glass used is 0.04w/mk (5 Marks)
(d) A block wall measures 5m x 2.8m in overall length and height. The wall contains one
window 14000mm x 800mm and one door 1900mm x 750mm. The u-values in w/m2k
are: Block work 0.58, windows 5.6 and doors 3.4. Calculate the average u-value of this
wall. (4 Marks)
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