Question
In: Mechanical Engineering
The air inside inside a house is 14 oC and the convective heat transfer coefficient h...
The air inside inside a house is 14 oC and the convective heat transfer coefficient h = 11 W/m2⋅°C. The air outside the house is 49 oC and the convective heat transfer coefficient h = 7 W/m2⋅°C. A window has dimensions (2m x 2.5m x 8mm) and heat conduction of 0.8W/mk. Determine the total heat resistance through the window in oC/W
Solutions
samet mamat answered 1 year agoRelated Solutions
Determine the overall heat transfer coefficient (U) in a heat exchanger that uses steam to heat water to the point of vaporization (in vacuum.)
Determine the overall heat transfer coefficient (U) in a heat exchanger that uses steam to heat water to the point of vaporization (in vacuum.) The system is non-insulated, so the heat lost to the surroundings must be taken into consideration. While I know that the heat Q = mCdT and the heat transfer rate q = UAdT(Log-mean), I am struggling to equate the two due to the heat lost to the surroundings. How do I go about determining the overall...
Consider the following schematic for an experiemental methodology to measure the convection heat transfer coefficient distrubution...
Consider the following schematic for an experiemental
methodology to measure the convection heat transfer coefficient
distrubution on an airfoil. The metal sheathing is supplied with a
heat generation rate of 20 * 106 W/m3. The
thickness of the metal sheathing is t = 30 um, and the sheathing's
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the temperatures are measured are spaced evenly at 2mm apart. The
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Location
Temperature (degrees...
An air compressor rapidly fills a 0.3m3 tank (there is no heat transfer through the tank...
An air compressor rapidly fills a 0.3m3 tank (there is no heat
transfer through the tank walls), initially containing air at 27
?C, 1 atm, with air drawn from the atmosphere at 27? ?C, 1 atm.
During filling, the relationship between the pressure and specific
volume of the air in the tank is pv1.4 = constant. You can
model the air as an ideal gas with constant specific heats at
300K.
Calculate (and show your work) the tank’s pressure and...
An air compressor rapidly fills a 0.3m3 tank (there is no heat transfer through the tank...
An air compressor rapidly fills a 0.3m3 tank (there is no heat
transfer through the tank walls), initially containing air at 27
?C, 1 atm, with air drawn from the atmosphere at 27? ?C, 1 atm.
During filling, the relationship between the pressure and specific
volume of the air in the tank is pv1.4 = constant. You can
model the air as an ideal gas with constant specific heats at
300K.
Calculate (and show your work) the tank’s pressure and...
How many ways can you see that heat can transfer from the inside to the outside...
How many ways can you see that heat can transfer from the inside
to the outside of your room on a cold day? List at least three and
describe in detail how heat moves through the different kinds of
materials (glass, brick, wood, insulation, etc.)—by conduction,
convection or radiation. Which process do you suppose
dominates?
The heat transfer coefficient of a steel (k = 43 W/m · K) tube (1.9 cm...
The heat transfer coefficient of a steel (k = 43 W/m · K) tube
(1.9 cm ID and 2.3 cm OD) in a shell-and-tube heat exchanger is 500
W/m2 · K on the inside and 120 W/m2 · K on the shell side, and it
has a deposit with a total fouling factor of 0.000176 m2 · K/W.
Calculate
a. The overall heat transfer coefficient
b. The cleanliness factor, and percent over surface.
a heat transfer experiment consist of a stream of air blowing over a heated horizontal plate....
a heat transfer experiment consist of a stream of air blowing
over a heated horizontal plate. what causes the formation of both
velocity and thermal boundary layers? what causes a difference in
thickness between them?
Convert: a. Thermal conductivity value of 0.3 Btu/(h ft oF) to W/(m oC). b. Surface heat...
Convert: a. Thermal conductivity value of 0.3 Btu/(h ft oF) to
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b. Surface heat transfer coefficient value of 105 Btu/(h ft^2
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Convection Heat transfer internal flow Consider water flowing in a heated tube. The tube is 14...
Convection Heat transfer internal flow
Consider water flowing in a heated tube. The tube is 14 m long
with an inner diameter of 1 cm. The heat
is added at 1500 W/m2 uniformly along the tube. Water flows at 0.3
m/s. Use the following water property
? = 1000 kg/m3, ? = 1.4 × 10?3 kg/m·s, cp =
4.2 kJ/kg·K, k = 0.58 W/m·K, and determine
1. Heat transfer coefficient at the tube exit.
2. Tube surface temperature at the...
Transient heat transfer Leaking steam completely fills a room, pushing out all of the air. The...
Transient heat transfer
Leaking steam completely fills a room, pushing out all of the
air. The steam is at atmospheric pressure. Because the mortar
cement siding walls are initially cool, at a uniform temperature of
22C, the steam begins to condense on the walls. Find the rate of
condensation per square meter of wall at (a) 10 s and (b) 30 s
after the leak.
The wall is 10 cm thick, and you may assume that the other side
of...
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