LTE !!!:خاصA docs.google.comUntitled QuestionQ1/ consider a (0.8m) high and (1.5m) wide double pane widow consisting of two (4mm)thick layers of glass (k=0.78W/m.°C) separated by a (10mm) wide stagnant air space(k=0.026W/m.°C). ). Take the (hi) on the inner surface = 10W/m2.°C and (ho) on the outersurface = 40W/ m².°C. DetermineYour answerThe steady rate of heat transfer through thisdouble pane window is equal *69.28W6528W6.028W692.8WThe temperature of its inner surface for aday during which the room is maintained at(293K) while the temperature of the outdooris (263K) is equal to *13.932 C139.32 C17.932 C139.32 oCRequest edit access

Given data: Height of the window, h = 0.8 m. Width of the window, b = 1.5 m. The thickness of…

Q1/ consider a (0.8m) high and (1.5m) wide double pane widow consisting of two (4mm) thick layers of glass (k=0.78W/m.ºC) separated by a (1Omm) wide stagnant air space (k=0.026W/m.°C). ). Take the (hi) on the inner surface = 10W/m².°C and (ho) on the outer surface = 40W/ m?.°C. Determine Your answer The steady rate of heat transfer through this double pane window is equal

Q1/ consider a (0.8m) high and (1.5m) wide double pane widow consisting of two (4mm) thick layers of glass (k=0.78W/m.ºC) separated by a (1Omm) wide stagnant air space (k=0.026W/m.°C). ). Take the (hi) on the inner surface = 10W/m².°C and (ho) on the outer surface = 40W/ m?.°C. Determine Your answer The steady rate of heat transfer through this double pane window is equal

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter1: Basic Modes Of Heat Transfer

Section: Chapter Questions

Problem 1.68P

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Q1/ consider a (0.8m) high and (1.5m) wide double pane widow consisting of two (4mm) thick layers of glass (k=0.78W/m.°C) separated by a (10mm) wide stagnant air space (k=0.026W/m.C). ). Take the (hi) on the inner surface = 10W/m2.°C and (ho) on the outer surface = 40W/ m².°C. Determine The steady rate of heat transfer through this double pane window is equal The temperature of its inner surface for a day during which the room is maintained at (293K) while the temperature of the outdoor is (263K) is equal to *
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Untitled Question QI/ consider a (0.8m) high and (1.5m) wide double pane widow consisting of two (4mm) thick layers of glass (k=0.78W/m.°C) separated by a (10mm) wide stagnant air space (k=0.026W/m.°C). ). Take the (hi) on the inner surface = 10W/m².°C and (ho) on the outer surface = 40W/ m². °C. Determine * The steady rate of heat transfer through this double pane window is equal 69.28W 6528W 6.028W 692.8W O The temperature of its inner surface for a day during which the room is * maintained at (293K) while the temperature of the outdoor is (263K) is equal to 13.932 C O 139.32 C O 17.932 C O 139.32 oc O
..P15 A horizontal cylinder 10 cm in diameter contains helium gas at room temperature and atmospheric pressure. A piston keeps the gas inside a region of the cylinder 20 cm long. (a) If you quickly pull the piston outward a distance of 12 cm, what is the approximate temperature of the helium immediately afterward? What approximations did you make? (b) How much work did you do, including sign? (Note that you need to consider the outside air as well as the inside helium in calculating the amount of work you do.) (c) Immediately after the pull, what force must you exert on the piston to hold it in position (with the helium enclosed in a volume that is 20 + 12 = 32 cm long)? (d) You wait while the helium slowly returns to room temperature, maintaining the piston at its current location. After this wait, what force must you exert to hold the piston in position? (e) Next, you very slowly allow the piston to move back into the cylinder, stopping when the region of helium gas is 25 cm long.…
العنوان оне hot small copper ball [c in kJ/kg.°C, k in W/m.°C] is suddenly placed in water maintained at 100 °C. The convection heat transfer coefficient is h in W/m². ºC. Derive equation to calculate the time required to reduce ball to temperature T. би ८ To silve Fist ۲/۱ CIC
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Consider a thin-walled, ﬁ xed-volume container of volume V that holds an ideal gas at constant temperature T. It can be shown by dimensional analysis that the number of particles striking the walls of the container per unit area per unit time is given by nv-/4, where as usual n is the particle number density. The container has a small hole of area A in its surface through which the gas can leak slowly. Assume that A is much less than the surface area of the container. (a) Assuming that the pressure inside the container is much greater than the outside pressure (so that no gas will leak from the outside back in), estimate the time it will take for the pressure inside to drop to half the initial value. Your answer should contain A, V, and the mean molecular speed v-. (b) Obtain a numerical result for a spherical container with a diameter of 40 cm containing air at 293 K, if there is a circular hole of diameter 1.0 mm in the surface.