Question

An 80.0 cm × 1.25 m glass window has a thickness of 2.34 mm. If the indoor temperature is 22.0°F and the outdoor temperature is 98.5°F, What is the rate at which heat is conducted through the glass in this window? (thermal conductivity of glass is 0.75 W/(m•K))

Answer #1

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...

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

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)?

A glass windowpane in a home is 0.62 cm thick and has dimensions
of 1.5 m × 1.7 m. On a certain day, the indoor temperature is 28°C
and the outdoor temperature is 0°C. (a) What is the rate at which
energy is transferred by heat through the glass? W (b) How much
energy is lost through the window in one day, assuming the
temperatures inside and outside remain constant? J

A clever student decides to produce and sell windows that
consist of two 5.9-mm thick glass panes ( thermal conductivity of 1
W/m-K) separated by a 0.9-cm thick layer of aerogel, which has a
thermal conductivity of 10-4 W/m-K). Assuming the
temperature inside is 19.5˚ C, and the temperature outside is
-4.7˚C, what is the approximate heat loss in units of Watts through
such a window with area 1 m2?

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...

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 glass windowpane in a home is 0.62 cm thick and has dimensions
of 1.3 m × 2.2 m. On a certain day, the indoor temperature is 30°C
and the outdoor temperature is 0°C.
(a) What is the rate at which energy is transferred by heat
through the glass?
(b) How much energy is lost through the window in one day, assuming
the temperatures inside and outside remain constant?

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...

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)

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