Engineering, 26.09.2019 19:30 bellebug6208
Acold storage room is used to keep the temperature inside the room maintain at low temperature.
therefore, the special wall must be used to reduce the heat transfer rate in order to minimise the energy
consumption. a 3 m and 7 m wide wall consists of 17 cm x 24 cm cross section horizontal bricks where
thermal conductivity of the brick is given as k=0.77 w/m. k. the wall is separated by 2 cm thick layers of
cement where thermal conductivity is given as k = 0.33 w/m. k. each side of the bricks are also being covered
by the cement (2 cm thick). there are 5 cm polystyrene foam is used at the left side of the wall where k=
0.0011 w/m. k. the indoor temperature and outdoor temperatures are -5°c and 30°c respectively. the
convection heat transfer coefficients on the indoor and outdoor are h1=11 w/m²k and h2=23 w/m².k
respectively. assuming one dimensional heat transfer and disregarding radiation heat transfer, determine
the rate of the heat transfer through the wall (for one cell of bricks).
Answers: 3
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Acold storage room is used to keep the temperature inside the room maintain at low temperature.
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