Homework Answers
Add Answer to:
To defrost ice accumulated on the outer surface of an automobile windshield, warm air is blown...
The ice on the rear window of an automobile is defrostedby attaching a thin, transparent, film...
The ice on the rear window of an automobile is defrostedby attaching a thin, transparent, film type heatingelement to its inner surface. By electrically heating this element, a uniform heat flux may be established at the inner surface.The insideair temperature and convection heat transfer coefficient are T,i= 25°C and hi= 25W/(m2-K), while the outsideair temperature isT,o= -10°C.For 4-mm thick window glass, determine (a) the electric power required per unit window area to maintain an inner surface temperature of 15°C and...
Defog Rear Window
To defog therear window of an automobile, a very thintransparent heating element is attached to the inner surface of the window. A Uniformheat flux of 1300 W/m2 is provided to the heating element for defogging a rear windowwith thickness of 5 mm. The interior temperature of the automobile is 22°C and theconvection heat transfer coefficient is 15 W/m2·K. The outside ambient temperature is−5°C and the convection heat transfer coefficient is 100 W/m2·K. If the thermalconductivity of the window is 1.2...
11 We often see frost on a windshield of car at a clear cold night. A...
11 We often see frost on a windshield of car at a clear cold night. A thin layer of water formed from moist ar dew point) on a windshield of a car in a parking lot is exposed to a clear sky at -17°C. The ambient air temperature and convection coefficient are 5°C and 10 W/m2.K. Assume that the emissivity of the thin layer of water is 0.9. Explain how frost can be formed even the ambient air temperature of...
Do part B with matlab code The rear window of an automobile is defogged by attach...
Do
part B with matlab code
The rear window of an automobile is defogged by attach ing a thin, transparent, film-type heating element to its inner surface. By electrically heating this element, a uni- form heat flux may be established at the inner surface For 4-mm-thick window glass, determine the electrical power required per unit window area to maintain arn inner surface temperature of 15°C when the interior air temperature and convection coefficient are To 25°C and hi = 10...
Thermal Resistance Analysis: Consider a 1.2 m high and 1.4 m wide double-pane window consisting o...
Thermal Resistance Analysis: Consider a 1.2 m high and 1.4 m wide double-pane window consisting of two 4 mm thick layers ofglass (k-0.85 W m-K) separated by a 8-min stagnant air space. (k= 0.025 W m-K) Determine the steady rate of heat transfer through this double-pane window and the temperature of its inner and outer surfaces on a day when the inside room temperature is maintained at 20 °C and the outside ambient temperature is 32 °C. Assume the convection...
Cold conditioned air at 10°C is flowing inside a 1.5 cm thick square aluminum (k = 240 w/mK) duct...
Cold conditioned air at 10°C is flowing inside a 1.5 cm thick square aluminum (k = 240 w/mK) duct of inner cross section of 25x25cm at a mass flow rate of 1.0 kg/s. The duct is exposed to air at 35°C with a combined convection-radiation heat transfer coefficient of 15 W/m2K. The convection heat transfer coefficient at the inner surface is 75 W/.m2.K. If the air temperature in the duct should not increase by more than 1°C determine the maximum...
5) A certain automobile has a 4 mm thick glass window with a surface area of...
5) A certain automobile has a 4 mm thick glass window with a surface area of 2.8 m². The outside temperature is 32°C while the passenger compartment is maintained at 22°C. The convection heat transfer coefficient on the exterior window surface is h = 90 W/(m²K). Determine the heat gain through the windows when the interior convection heat transfer coefficient is h = 15 W/(m²K). By controlling the air flow in the passenger compartment the interior heat transfer coefficient can...
[6] A 20-cm thick wall of a house made of brick (k = 0.72W/m. C) is...
[6] A 20-cm thick wall of a house made of brick (k = 0.72W/m. C) is subjected to inside air at 22.C with a convection heat-transfer coefficient of 15 W/m2. C. The inner surface temperature of the wall is 18 C and the outside air temperature is -1 °C. Determine the outer surface temperature of the wall and the heat-transfer coefficient at the outer surface.
The solar radiation incident on the outside surface of an aluminum shading device is 1300 W/m2...
The solar radiation incident on the outside surface of an aluminum shading device is 1300 W/m2 . Aluminum absorbs 10% of the incident solar energy, and dissipates it by convection from the back surface and by combined convection and radiation from the outside surface. The convection heat transfer coefficient is 10 W/m2 ·K for both surfaces, and the ambient/surrounding temperature can be taken 20 °C for both convection and radiation. Assuming that the aluminum shade has a uniform temperature, determine...
A household oven door of 0.6-m height and 0.7-m width reaches an average surface temperature of...
A household oven door of 0.6-m height and 0.7-m width reaches an average surface temperature of 32°C during operation. The temperature of ambient air is 22°C. Assuming the door has an emissivity of 0.8 and the surroundings are also at 22°C, determine the heat transfer by free convection and the heat transfer by radiation. 1) What is the volumetric thermal expansion coefficient of air at the film temperature outside the oven door, in 1/K? 2) What is the Rayleigh number...
11 We often see frost on a windshield of car at a clear cold night. A thin layer of water formed from moist ar dew point) on a windshield of a car in a parking lot is exposed to a clear sky at -17°C. The ambient air temperature and convection coefficient are 5°C and 10 W/m2.K. Assume that the emissivity of the thin layer of water is 0.9. Explain how frost can be formed even the ambient air temperature of...
Do
part B with matlab code
The rear window of an automobile is defogged by attach ing a thin, transparent, film-type heating element to its inner surface. By electrically heating this element, a uni- form heat flux may be established at the inner surface For 4-mm-thick window glass, determine the electrical power required per unit window area to maintain arn inner surface temperature of 15°C when the interior air temperature and convection coefficient are To 25°C and hi = 10...
Thermal Resistance Analysis: Consider a 1.2 m high and 1.4 m wide double-pane window consisting of two 4 mm thick layers ofglass (k-0.85 W m-K) separated by a 8-min stagnant air space. (k= 0.025 W m-K) Determine the steady rate of heat transfer through this double-pane window and the temperature of its inner and outer surfaces on a day when the inside room temperature is maintained at 20 °C and the outside ambient temperature is 32 °C. Assume the convection...
Cold conditioned air at 10°C is flowing inside a 1.5 cm thick square aluminum (k = 240 w/mK) duct of inner cross section of 25x25cm at a mass flow rate of 1.0 kg/s. The duct is exposed to air at 35°C with a combined convection-radiation heat transfer coefficient of 15 W/m2K. The convection heat transfer coefficient at the inner surface is 75 W/.m2.K. If the air temperature in the duct should not increase by more than 1°C determine the maximum...
5) A certain automobile has a 4 mm thick glass window with a surface area of 2.8 m². The outside temperature is 32°C while the passenger compartment is maintained at 22°C. The convection heat transfer coefficient on the exterior window surface is h = 90 W/(m²K). Determine the heat gain through the windows when the interior convection heat transfer coefficient is h = 15 W/(m²K). By controlling the air flow in the passenger compartment the interior heat transfer coefficient can...
[6] A 20-cm thick wall of a house made of brick (k = 0.72W/m. C) is subjected to inside air at 22.C with a convection heat-transfer coefficient of 15 W/m2. C. The inner surface temperature of the wall is 18 C and the outside air temperature is -1 °C. Determine the outer surface temperature of the wall and the heat-transfer coefficient at the outer surface.
Most questions answered within 3 hours.
-
Determine the temperature (in Celsius) at which 1.00 mole of an
ideal gas will have a...
asked 5 minutes ago -
[1] Household statistics include individuals living alone or in
groups in:
A) apartments.
B) military barracks....
asked 8 minutes ago -
What is the % w/v when 80 mL of a 2.0% solution is mixed with 50...
asked 11 minutes ago -
How can I solve the following using a TI83
Claim: Most adults would erase all of...
asked 24 minutes ago -
Analysis of 3-ethyl-3-buten-2-ol gave C, 72.13%; H, 11.92%.
Calculate the percent deviation of these results from...
asked 21 minutes ago -
Which VALS segment is most likely to have a top of the line
brand new (2015)...
asked 25 minutes ago -
Write a program to score the paper-rock-scissor game. Each of
two users types in either P,R...
asked 45 minutes ago -
Calculate the equillibrium constent K for a redox reaction that
has E°cell = -.98 V at...
asked 57 minutes ago -
A concave spherical mirror has a radius of curvature of
magnitude 19.6 cm.
(a) Find the...
asked 59 minutes ago -
3. draw a diagram of the magnetic field:
a. around a long straight wire with a...
asked 57 minutes ago -
If you titrated 30.0 mL of 0.1 M HCl with 0.1 M NaOH, indicate
the approximate...
asked 1 hour ago -
NADH passes electrons into the electron transport chain. List
the carriers that would receive the electrons,...
asked 1 hour ago