solve all 4, show assumptions and comments for each. 1. A 0.75-m x 1.5-m window is constructed of 6-mm-thick glass. On a cold night, the inside andoutside surface temperatures of the glass are 16°C and -24°C, respectively.(a) What is the rate of heat loss through the glass?(b) The window is replaced by a double-paned window, in which two panes of glass areseparated by an air space. If the spacing of the panes is 13 mm and the glass surfacetemperatures in contact with the interior air space are 12°C and -18°C, what is the newrate of heat loss from the window? (Hint: since the temperatures on the inside glasssurfaces are given, you need only analyze conduction across the air gap.)2. The convection heat transfer coefficient can have a great effect on how a personexperiences temperature. Determine the convection heat flux from a person's hand in eachof the circumstances below. In each case, the person's hand can be assumed to have asurface temperature of 30°C.(a) Hand outside the window of a car moving at 20 mph in air at -15°C with a convectioncoefficient of 40 W/m²-K.(b) Hand in a slow moving stream of water at 10°C with a convection coefficient of 900W/m²-K.(c) Hand in still air in an air conditioned room at 20°C with a convection coefficient of 3W/m²-K.3. Both convection and radiation heat transfer can be important in situations where the heattransfer coefficient is relatively low. A steam pipe running through a factory is 30 m longand has a diameter of 15 cm. The steam maintains the outside surface temperature of thepipe at 165°C, and the emissivity of the pipe's surface is = 0.8. The natural convectionheat transfer coefficient is 8 W/m²-K. Determine the heat loss rate from the pipe to thesurrounding air and walls, both of which are at a temperature of 25°C.4. The air temperature in a room is maintained at 20°C year-round, but the wall temperatureis approximately 27°C in the summer and 14°C in the winter. Determine the total(convection + radiation) rates of heat transfer from a person in this room in both winter andsummer if the exposed surface area, emissivity, convection coefficient, and the averageouter surface temperature of the person are 1.8 m², 0.8, 4 W/m²-K, and 31°C, respectively. k (glass) = 1.4 W/m-K, from Table A.3k (air) = 0.0239 W/m-K, from Table A.4, property evaluated @ 270 K

“Since you have posted multiple questions with multiple sub parts, we will provide the solution only…

1. A 0.75-m x 1.5-m window is constructe outside surface temperatures of the gla (a) What is the rate of heat loss throug (b) The window is replaced by a double separated by an air space. If the spa temperatures in contact with the int rate of heat loss from the window? surfaces are given, you need only ar

1. A 0.75-m x 1.5-m window is constructe outside surface temperatures of the gla (a) What is the rate of heat loss throug (b) The window is replaced by a double separated by an air space. If the spa temperatures in contact with the int rate of heat loss from the window? surfaces are given, you need only ar

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

Strengthening of Alloys

Strengthening of the alloys is required as metals become weak due to various lattice defects, metal bonding phenomena. The strength of the metals is not enough for any mechanical work. The internal dislocations of any metals arise due to forming processes. Due to the movement of these dislocations, the metals are plastically deformed.

Question

solve all 4, show assumptions and comments for each.

1. A 0.75-m x 1.5-m window is constructed of 6-mm-thick glass. On a cold night, the inside and
outside surface temperatures of the glass are 16°C and -24°C, respectively.
(a) What is the rate of heat loss through the glass?
(b) The window is replaced by a double-paned window, in which two panes of glass are
separated by an air space. If the spacing of the panes is 13 mm and the glass surface
temperatures in contact with the interior air space are 12°C and -18°C, what is the new
rate of heat loss from the window? (Hint: since the temperatures on the inside glass
surfaces are given, you need only analyze conduction across the air gap.)
2. The convection heat transfer coefficient can have a great effect on how a person
experiences temperature. Determine the convection heat flux from a person's hand in each
of the circumstances below. In each case, the person's hand can be assumed to have a
surface temperature of 30°C.
(a) Hand outside the window of a car moving at 20 mph in air at -15°C with a convection
coefficient of 40 W/m²-K.
(b) Hand in a slow moving stream of water at 10°C with a convection coefficient of 900
W/m²-K.
(c) Hand in still air in an air conditioned room at 20°C with a convection coefficient of 3
W/m²-K.
3. Both convection and radiation heat transfer can be important in situations where the heat
transfer coefficient is relatively low. A steam pipe running through a factory is 30 m long
and has a diameter of 15 cm. The steam maintains the outside surface temperature of the
pipe at 165°C, and the emissivity of the pipe's surface is = 0.8. The natural convection
heat transfer coefficient is 8 W/m²-K. Determine the heat loss rate from the pipe to the
surrounding air and walls, both of which are at a temperature of 25°C.
4. The air temperature in a room is maintained at 20°C year-round, but the wall temperature
is approximately 27°C in the summer and 14°C in the winter. Determine the total
(convection + radiation) rates of heat transfer from a person in this room in both winter and
summer if the exposed surface area, emissivity, convection coefficient, and the average
outer surface temperature of the person are 1.8 m², 0.8, 4 W/m²-K, and 31°C, respectively.

k (glass) = 1.4 W/m-K, from Table A.3
k (air) = 0.0239 W/m-K, from Table A.4, property evaluated @ 270 K

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