Question

Consider the vertical rear window of an automobile that has a thickness L= 9 mm and height H=0.5 m with heating wires that create uniform volumetric heating. The window interior is exposed to ambient air at 10°C and the window exterior to air at -10°C which moves in parallel flow over the surface with a velocity of 20 m/s. The surface temperature of the window exterior is 12°C.

Using the correlation developed by Churchill and Chu, find the
convective heat transfer coefficient for the window interior, in
W/m^{2}·K .

Answer #1

16a) A triple glazed window consists of 3 clear glass
panes of 4 mm thickness each, separated by two
air cavities of 13 mm each in thickness. The
window area is 1.0 m2
. If the thermal conductivity
of the glass panes is 0.8 W•m-1•K-1 and of the air
cavities is 0.026 W•m-1•K-1 what is the total
thermal resistance of the window?
(A) 2.452 K•W-1
(B) 0.015 K•W-1
(C) 1.015 K•W-1
(D) 6004 K•W-1
16b)A heater provides 305 W of...

A window has a glass surface of 2314 cm2 and a thickness of 3.5
mm.
A) Find the rate of energy transfer by conduc- tion through this
pane when the temperature of the inside surface of the glass is
71◦F and the outside temperature is 81 ◦F. Assume the thermal
conductivity of window glass is 0.8 J/s · m · ◦ C. Answer in units
of kW.
B) Find the rate of energy transfer for the same inside
temperature and...

1. An oven chimney is
made of brick with a heat transmission coefficient 1.1 W/mK 10 cm
thick. Since the shaft exterior radiation beam coefficient is 0.8
and the flue gas temperature is 350°C, the external ambient
temperature is 25°C and the outer ambient heat transport
coefficient is 20 W/m2K;
a) Calculate the shaft exterior
temperature.
b) In order to reduce the risk of burn
injury that may occur in the body, the shaft is asked to be below
55°Cve...

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