Question

Estimate the heat loss, due to conduction through a 1 square meter window if the inside temperature is 20°C and the outside temperature is 0°C. There is a stagnant layer of air on each side of the window, which makes the temperature difference across the 5 mm thick window only 1°C.

**This answer was 160 W.**

Estimate the heat loss by conduction through if it is double paned. Assume the stagnant air layer is between the two layers of glass and is also 5.0 mm thick. Assume the inside glass is at 20C and the outside glass is at 0C. Compare the heat loss through the double pane window to that of a single pane.

Answer #1

1.
Consider a 1.8-m high and 1.5 m-wide double-pane window
consisting of two 4-mm thick layers of glass (k = 0.78 W/m°C)
separated by a 10-mm wide stagnant air space (k = 0.026 W/m°C). The
room is maintained at 20°C while the temperature of the outdoors is
-10°C. Take the convective heat transfer coefficients on the inner
and outer surfaces of the window to be 10 W/m2°C and 40 W/m2°C,
respectively.
Determine the steady rate of heat transfer through this...

Constants A picture window has dimensions of 1.40 m×2.50 m and
is made of glass 5.80 mm thick. On a winter day, the outside
temperature is -15.0 ?C , while the inside temperature is a
comfortable 20.5 ?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 0.0500 W/m?K)?

Air has a thermal conductivity of 3 x 10-4 J cm-1 s-1 K-1.
Consider a window with double panes
of glass where the temperature of the inside pane is 25 oC and the
temperature of the outside
pane is -5 oC. The size of the window is 40 cm x 60 cm, and the
panes are 8 mm apart. What is
the heat flow in watts through the window? You can ignore
convection.

Your firm has designed a new 2m double-paned window which
consists of two 5 mm thick plates of glass (k = 0.75 W/mK)
separated by a 14 mm thick layer of xenon gas with an unknown
thermal conductivity, which you intend to determine through an
experiment. You use a heater that provides 100 W of heat to
maintain one side of the window at 80 °C while the other 2 side is
exposed to the air in the room with...

A vertical 1 m high, 2 m wide double pane window consists of two
layers of glass separated by 3 cm air gap at atmospheric pressure.
The inner and outer glass temperature are 18 ℃ and 4 ℃,
respectively
Using MATLAB SOFTWARE
(a) determine the rate of heat loss through the window by natural
convection for vertical and horizontal orientation
(b) Determine percent reduction in heat transfer loss for the
vertical enclosure compared to horizontal enclosure

A wall in a house contains a single window. The window consists
of a single pane of glass whose area is 0.15 m2 and whose thickness
is 1.9 mm. Treat the wall as a slab of the insulating material
Styrofoam whose area and thickness are 15.00 m2 and 0.110 m,
respectively. Heat is lost via conduction through the wall and the
window. The temperature difference between the inside and outside
is the same for the wall and the window. Of...

A thermo-pane window consisting of 2 pieces of glass0.4
cm thick and an air gap of 0.75 cm has inside temperature of 680 F
and outside of 950F. a) Compute the rate of heat lost, b) find the
the temperature spread across the single piece of
glass.

A picture window has dimensions of 1.40 m×2.50 m and is made of
glass 5.10 mm thick. On a winter day, the outside temperature is
-15.0 ∘C , while the inside temperature is a comfortable 21.0 ∘C
.
Part 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 0.0500 W/m⋅K)?
**I'm getting 6713 W but it saying im wrong. Please help

14.5. A window has a glass thickness d - 5 mm. Inside
the temperature is T, = 20 ° C and the air is calm; outside, the
temperature is T=0C and the wind blows with speed v 20 km / h
Calculate the thermal power W transmitted from the window area
unit. sa (Answer: 106 W / m2)

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...

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