Consider a room with a 1.8-m-high and 2.0-m-wide double- pane window consisting of two 4-mm-thick layers of glass separated by a 10-mm-wide stagnant air space. The convection heat transfer coefficients on the inner and outer surfaces of the window are 12 W/m? K and 25 W/m? K, respectively, while the average thermal conductivity of glass is 0.78 W/m K; and the air, 0.026 W/m K. If the room is maintained at 22C. the outside temperature is -4 °C and heat transfer due to radiation can be neglected, determine: (i) Draw the sketch and thermal resistance network: (ii) the total thermal resistance; (iii) the steady rate of heat transfer through this double-pane window (iv) the temperature of the inner surface of the window.

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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Consider a room with a 1.8-m-high and 2.0-m-wide double-
pane window consisting of two 4-mm-thick layers of glass
separated by a 10-mm-wide stagnant air space. The
convection heat transfer coefficients on the inner and outer
surfaces of the window are 12 W/m? K and 25 W/m? K,
respectively, while the average thermal conductivity of glass is
0.78 W/m K; and the air, 0.026 W/m K.
(a)
If the room is maintained at 22 C, the outside temperature is
-4 C and heat transfer due to radiation can be neglected,
determine:
(i)
Draw the sketch and thermal resistance network
(ii)
the total thermal resistance;
the steady rate of heat transfer through this double-pane
window
(ii)
(iv)
the temperature of the inner surface of the window.
If a fuel contains 86% C, 9% H2, 1% S and 4% ash (silica) by
mass, determine:
(b)
(i)
the total oxygen needed;
(ii)
the total air needed;
(iii)
the stoichiometric air/fuel ratio.
Page 2 of 5
D Focus
ENG
99+
Transcribed Image Text:Consider a room with a 1.8-m-high and 2.0-m-wide double- pane window consisting of two 4-mm-thick layers of glass separated by a 10-mm-wide stagnant air space. The convection heat transfer coefficients on the inner and outer surfaces of the window are 12 W/m? K and 25 W/m? K, respectively, while the average thermal conductivity of glass is 0.78 W/m K; and the air, 0.026 W/m K. (a) If the room is maintained at 22 C, the outside temperature is -4 C and heat transfer due to radiation can be neglected, determine: (i) Draw the sketch and thermal resistance network (ii) the total thermal resistance; the steady rate of heat transfer through this double-pane window (ii) (iv) the temperature of the inner surface of the window. If a fuel contains 86% C, 9% H2, 1% S and 4% ash (silica) by mass, determine: (b) (i) the total oxygen needed; (ii) the total air needed; (iii) the stoichiometric air/fuel ratio. Page 2 of 5 D Focus ENG 99+
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