(a) State all modes of heat transfer and identify, with an explanation of why, which of...

 

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(a) State all modes of heat transfer and identify, with an explanation of why, which of these modes is the most significant for heat loss from any building surface or envelopes. How can this heat transfer be reduced? (b) An exterior wall of a house consists of a 10 cm layer of common brick (k = 0.75 W/mK) followed by a 4 cm layer of gypsum plaster (k = 0.5 W/mK). Compute the heat flow Q (W) through a unit area of this wall for a temperature difference of 40°C. (c) What thickness of rock wool insulation (k = 0.065 W/mK) should be included to reduce the heat flow through the wall by 75%? (a) State all modes of heat transfer and identify, with an explanation of why, which of these modes is the most significant for heat loss from any building surface or envelopes. How can this heat transfer be reduced? (b) An exterior wall of a house consists of a 10 cm layer of common brick (k = 0.75 W/mK) followed by a 4 cm layer of gypsum plaster (k = 0.5 W/mK). Compute the heat flow Q (W) through a unit area of this wall for a temperature difference of 40°C. (c) What thickness of rock wool insulation (k = 0.065 W/mK) should be included to reduce the heat flow through the wall by 75%?

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Solution different modes of heat transfer are Conductio... View the full answer