Q2/ A thermopane window consists of two pieces of glass 7 mm thick that enclose an air space 7mm thick. The window separates room air at 20°C from outside ambient air at -10°C. Theconvection coefficient associated with the inner (room-side) surface is 10 W/m? K.If the convection coefficient associated with the outer (ambient) air is 80 W/m? K, what isthe heat loss through a window that is 0.8 m long by 0.5 m wide? Neglect radiation,f kglass = 1.4W/m-K: kair =0.024S W/m K)-Window, 0.8 m x 0.5 mGlassAir!Tmi= 20 °Chi = 10 Wim2 KAir11 L=0.007 mTo=-10 °Cho = 80 W/m2-KAir

T∞i=20°C, hi=10 Wm2KL=L1=L2=L3=.007 mA=.8×.5=.4 m2Kg=1.4 WmK and Kair=.0245 Wm Kh0=80 Wm2K,T∞0=-10°C…

Q2/ A thermopane window consists of two pieces of glass 7 mm thick that enelose an air space 7 mm thick. The window separates room air at 20°C from outside ambient air at -10°C. The convection coeflicient associated with the inner (room-side) surface is 10 Wim2 K. If the convection coefficient associated with the outer (ambient) air is 8o W/m2 K, what is the heat loss through a window that is 0.8 m long by 0.5 m wide? Neglcct radiation,f kglass = 1.4 W/m-K: kair -0.0245 W/m-K] Window, 0.8 m x 0.5 m Glass FL+L- Air| Taj= 20 °C hi = 10 W/m2 K Air I L=0.007 m T=-10 °C ho = 80 W/m2-K Air

Q2/ A thermopane window consists of two pieces of glass 7 mm thick that enelose an air space 7 mm thick. The window separates room air at 20°C from outside ambient air at -10°C. The convection coeflicient associated with the inner (room-side) surface is 10 Wim2 K. If the convection coefficient associated with the outer (ambient) air is 8o W/m2 K, what is the heat loss through a window that is 0.8 m long by 0.5 m wide? Neglcct radiation,f kglass = 1.4 W/m-K: kair -0.0245 W/m-K] Window, 0.8 m x 0.5 m Glass FL+L- Air| Taj= 20 °C hi = 10 W/m2 K Air I L=0.007 m T=-10 °C ho = 80 W/m2-K Air

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Concept explainers

Conduction and Convection

When energy travels from one object to another it is said to have undergone heat transfer. Heat transfer is nothing but the transfer of thermal energy or internal energy from one thing to another, like e.g., when a vessel with water, kept on top of a burner, heats up because of the flame underneath it.

Question

Q2/ A thermopane window consists of two pieces of glass 7 mm thick that enclose an air space 7
mm thick. The window separates room air at 20°C from outside ambient air at -10°C. The
convection coefficient associated with the inner (room-side) surface is 10 W/m? K.
If the convection coefficient associated with the outer (ambient) air is 80 W/m? K, what is
the heat loss through a window that is 0.8 m long by 0.5 m wide? Neglect radiation,f kglass = 1.4
W/m-K: kair =0.024S W/m K)
-Window, 0.8 m x 0.5 m
Glass
Air!
Tmi= 20 °C
hi = 10 Wim2 K
Air11 L=0.007 m
To=-10 °C
ho = 80 W/m2-K
Air

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