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..........BERMULALAH

QUESTION 3
a) An external cavity wall of a warehouse is constructed of two-layer brick each of 105mm
thick. The wall is 10.0m x 3.5m consists of a steel door 5.0m x 3.0m x 4mm thick and
window 1.5m x 1.5m x 5mm thick glass, from the data below. Calculate the heat transfer
through the door and window.
                                                                                                                   (20 marks)
Data:
Outside surface air resistance
Inside surface air resistance
Thermal Conductivity of steel
Thermal Conductivity of glass
Inside temperature
Outside temperature
0.055 m2oC/W
0.123 m2oC/W
210W/m°C
0.75 W/m°C
34 °C
24 °C

b) Explain briefly and give an example of thermal insulators for building       (5 marks)
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P/S :~~ ONE of the question

subject ~ building science 1,part ii 

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