A picture window has dimensions of 1.40\ m\times2.50\ mZS

Alfred Martin 2021-12-16 Answered
A picture window has dimensions of 1.40 m×2.50 m and is made of glass 5.20 mm thick. On a winter day, the temperature of the outside surface of the glass is 20.0C, while the temperature of the inside surface is a comfortable 19.5 C. (a) At what rate is heat being lost through the window by conduction? (b) At what rate would heat be lost through the window if you covered it with a 0.750-mm-thick layer of paper (thermal conductivity 0.0500wmk
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Expert Answer

Debbie Moore
Answered 2021-12-17 Author has 43 answers
We can calcualte the thermal resistance via
R=LK
=0.52×102 m0.8 WmK
=6.5×103m2KW
The rate of heat loss can be determined from
H=AR[THTC]
=1.4 m×2.5 m×[19.5(20)]K6.5×103m2KW
=2.1×104 W

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Bertha Jordan
Answered 2021-12-18 Author has 37 answers

b. Kpaper=0.05 WmK, Lpaper=0.075 cm
After converting the window with paper there will be additional thermal resistance
Rt=Rglass+Rpaper
for Rpaper
Rpaper=LK
=0.075×102 m0.05 WmK
=0.015 m2KW
Rt=0.015+6.5×103
=0.0125 m2KW
To calculated the rate of heat loss, calculate Rtask
H=AR[THTC]
=1.4 m×2.5 m×[19.5(20)]0.0125 m2KW
=6.4×103 W

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