Question
Take a glass window that is 2.5 m x 1.78 m and is 4.4 mm thick....
Take a glass window that is 2.5 m x 1.78 m and is 4.4 mm thick. If the outside air temperature is 44 ℉ and the inside temperature is 68 ℉, determine how long it would take to lose 2022 Btu of heat energy. Report your answer in minutes.
Homework Answers
Answer #1
1 Btu = 1055.06
- Heat flow = 2022 Btu = 2022 x 1055.06 = 2133.33 KJ
- Area = 2.5 x 1.78 = 4.45 m2
- Thickness ( L ) = 4.4 mm = 4.4 x 10-3 m
- Thermal conductivity of glass ( k ) = 1 W/m.K.
- Outside air temperature = 6.67 o C = 44o F
- Inside air Temperature = 20o C = 680 F
Q = ( KA
T
) / L
= 1 x 4.45 x ( 20 - 6.67 ) / ( 4.4 x 10-3 )
= 13481.47525 W
Time required in heat flow = Total heat flow / Rate of heat flow
= 2133.33 x 103 J / 13481.47525 W
= 158.24 seconds
= 2.637 Minutes .
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