a. 2–96 The inner and outer surfaces of a 0.5-cm-thick 2-m x 2-m window glass in...
a. 2–96 The inner and outer surfaces of a 0.5-cm-thick 2-m x 2-m window glass in winter are 10°C and 3°C, respectively. If the thermal conductivity of the glass is 0.78 W/m · °C, determine the amount of heat loss, in kJ, through the glass over a period of 5 h. What would your answer be if the glass were 1-cm thick? (Points 8+7=15) b. 2–107 The outer surface of a spacecraft in space has an emissivity of 0.8 and an absorptivity of 0.3 for solar radiation. If solar radiation is incident on the spacecraft at a rate of 1000 W/m2, determine the surface temperature of the spacecraft when the radiation emitted equals the solar energy absorbed.
Homework Answers
I have solved part a with both cases when glass thickness equal
to 0.5 cm and 1 cm. i have calculated heat loss throughly please
comment if any doubt. 
Add Answer to:
a. 2–96 The inner and outer surfaces of a 0.5-cm-thick 2-m x 2-m
window glass in...
(25pts) Consider a 1.2-m-high and 2-m-wide glass window whose thickness is 6 mm and thermal conductivity...
(25pts) Consider a 1.2-m-high and 2-m-wide glass window whose thickness is 6 mm and thermal conductivity is k 0.78 W/m °C. Determine the steady rate of heat transfer through this glass window and the temperature of its inner surface for a day during which the room is maintained at 24°C while the temperature of the outdoors is-5°C. Take the convection heat transfer coefficients on the inner and outer surfaces of the window to be h 10 W/m2 °C and h...
Consider a 1.2-m-high and 2-m-wide double-pane window consisting of two 3-mm-thick layers of glass (k =...
Consider a 1.2-m-high and 2-m-wide double-pane window consisting of two 3-mm-thick layers of glass (k = 0.78 W/m K) separated by a 12-mm-wide stagnant air space (k = 0.026 W/m K). Determine the steady rate of heat transfer through this double-pane window. R . and all the surface temperatures (inner and outer of each pane) within the circuit (which you will draw and correctly label) for a day during which the room is maintained at 24°C while the temperature of...
On a cold night the temperatures of the two surfaces of a glass windowpane in a...
On a cold night the temperatures of the two surfaces of a glass windowpane in a house are 7.8° C on the outer surface and 8.0° C on the inner surface when the air temperature is 0° C outside and 21.0° C inside. The glass is 3.24 mm thick. (The thermal conductivity for glass is 0.8 W/m-C°.) (a) Find the rate at which heat is conducted through the glass per square meter of the window area. (b) Find the value...
On a cold night the temperatures of the two surfaces of a glass windowpane in a...
On a cold night the temperatures of the two surfaces of a glass windowpane in a house are 7.8° C on the outer surface and 8.0° C on the inner surface when the air temperature is 0° C outside and 21.2° C inside. The glass is 3.33 mm thick. (The thermal conductivity for glass is 0.8 W/m-C°.) (a) Find the rate at which heat is conducted through the glass per square meter of window area. (b) Find the value of...
A thermopane window consists of two glass panes, each 0.50 cm thick, with a 1.0-cm-thick sealed...
A thermopane window consists of two glass panes, each 0.50 cm thick, with a 1.0-cm-thick sealed layer of air in between. (Use 0.8 J/s middot m middot degree C for the thermal conductivity of glass and 0.0234 J/s middot m middot degree C for the thermal conductivity of air to answer the following.) (a) If the inside surface temperature is 22.9 degree C and the outside surface temperature is 0.0 degree C, determine the rate of energy transfer through 1.60...
1. Consider a 1.2-m-high and 2-m-wide double-pane window consisting of two 3-mm a W/m C) separated...
1. Consider a 1.2-m-high and 2-m-wide double-pane window consisting of two 3-mm a W/m C) separated by a 12-mm-wide stagnant air space thick layers of glass ( 0.78 (0.026 W/m C). Determine the steady rate of heat transfer through this double- pane window and the temperature of its inner surface for a day during which the room is maintained at 24 C while the temperature of the outdoors is 5 C. Take the convection heat transfer coefficients on the inner...
A thermopane window consists of two glass panes, each 0.50 cm thick, with a 1.0-cm-thick sealed...
A thermopane window consists of two glass panes, each 0.50 cm thick, with a 1.0-cm-thick sealed layer of air in between. (Use 0.8 J/s · m · °C for the thermal conductivity of glass and 0.0234 J/s · m · °C for the thermal conductivity of air to answer the following.) (a) If the inside surface temperature is 21.2°C and the outside surface temperature is 0.0°C, determine the rate of energy transfer through 1.70 m2 of the window. (b) Compare...
The rate of heat conduction out of a window on a winter day is rapid enough...
The rate of heat conduction out of a window on a winter day is rapid enough to chill the air next to it. To see just how rapidly windows conduct heat, calculate the rate of conduction in watts through a 2.72 m2 window that is 0.515 cm thick if the temperatures of the inner and outer surfaces are 5.00°C and −10.0°C, respectively. This rapid rate will not be maintained — the inner surface will cool, and frost may even form....
A window glass has dimensions, 1.04 m high, 2.34 m wide and 1.341 cm thick, with a thermal conduc...
A window glass has dimensions, 1.04 m high, 2.34 m wide and 1.341 cm thick, with a thermal conductivity of 0.81 Wm10c-1. The outside- surface temperature is 32 °C and the inside-surface temperature is 24°c. Calculate the rate of heat transfer, in watts, through a plane of window glass, giving your answer to 3 decimal places.
A window glass has dimensions, 1.04 m high, 2.34 m wide and 1.341 cm thick, with a thermal conductivity of 0.81 Wm10c-1. The outside-...
Assist The inner and outer surfaces of a 6-mx7-m brick wall of thickness 40 cm and...
Assist The inner and outer surfaces of a 6-mx7-m brick wall of thickness 40 cm and thermal conductivity 0.55 W/m°C are maintained at temperatures of 26°C and T°C, respectively Determine the rate of heat transfer through the wall, in W. Chec Print Questi Report Brick wall 28 C
(25pts) Consider a 1.2-m-high and 2-m-wide glass window whose thickness is 6 mm and thermal conductivity is k 0.78 W/m °C. Determine the steady rate of heat transfer through this glass window and the temperature of its inner surface for a day during which the room is maintained at 24°C while the temperature of the outdoors is-5°C. Take the convection heat transfer coefficients on the inner and outer surfaces of the window to be h 10 W/m2 °C and h...
Consider a 1.2-m-high and 2-m-wide double-pane window consisting of two 3-mm-thick layers of glass (k = 0.78 W/m K) separated by a 12-mm-wide stagnant air space (k = 0.026 W/m K). Determine the steady rate of heat transfer through this double-pane window. R . and all the surface temperatures (inner and outer of each pane) within the circuit (which you will draw and correctly label) for a day during which the room is maintained at 24°C while the temperature of...
A thermopane window consists of two glass panes, each 0.50 cm thick, with a 1.0-cm-thick sealed layer of air in between. (Use 0.8 J/s middot m middot degree C for the thermal conductivity of glass and 0.0234 J/s middot m middot degree C for the thermal conductivity of air to answer the following.) (a) If the inside surface temperature is 22.9 degree C and the outside surface temperature is 0.0 degree C, determine the rate of energy transfer through 1.60...
1. Consider a 1.2-m-high and 2-m-wide double-pane window consisting of two 3-mm a W/m C) separated by a 12-mm-wide stagnant air space thick layers of glass ( 0.78 (0.026 W/m C). Determine the steady rate of heat transfer through this double- pane window and the temperature of its inner surface for a day during which the room is maintained at 24 C while the temperature of the outdoors is 5 C. Take the convection heat transfer coefficients on the inner...
A window glass has dimensions, 1.04 m high, 2.34 m wide and 1.341 cm thick, with a thermal conductivity of 0.81 Wm10c-1. The outside- surface temperature is 32 °C and the inside-surface temperature is 24°c. Calculate the rate of heat transfer, in watts, through a plane of window glass, giving your answer to 3 decimal places.
A window glass has dimensions, 1.04 m high, 2.34 m wide and 1.341 cm thick, with a thermal conductivity of 0.81 Wm10c-1. The outside-...
Assist The inner and outer surfaces of a 6-mx7-m brick wall of thickness 40 cm and thermal conductivity 0.55 W/m°C are maintained at temperatures of 26°C and T°C, respectively Determine the rate of heat transfer through the wall, in W. Chec Print Questi Report Brick wall 28 C
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