A furnace can be thought of as a square with each side being 3 m. On one side of the furnace, there is an observation window, which allows all radiation to transfer and be measured. The observation window is 20 cm long and is centered in the center of one of the sides of the furnace. Determine the amount of radiative heat transfer from the furnace wall opposite the window (surface #1 above) and the window.
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A furnace can be thought of as a square with each side being 3
m. On...
wall with a base A long fin (square in cross-section, 2 mm on one side) projects...
wall with a base A long fin (square in cross-section, 2 mm on one side) projects from a temperature of 80°C. The fin is aluminum, with k 200 W/m-K. At a length of 2 cm, the temperature is measured and found to be 50°C. The surrounding air is at 25°C What is the convective heat transfer coefficient?
1. A square column measuring 15 cm on each side is poured with concrete (stone mix)...
1. A square column measuring 15 cm on each side is poured with concrete (stone mix) with a 2.5 cm diameter circular pipe in the center. The pipe carries hot water such that the surface of the pipe is maintained at a constant temperature of 80 °C. Calculate the temperature of the column surface if the heat transfer in the column is 200 W per meter of column length
One end of a long rod 3 cm in diameter is inserted into a furnace with the
One end of a long rod 3 cm in diameter is inserted into a furnace with the (3 outer end projecting into the outside air. Once the steady state is reached the temperature of the rod is measured at two points, 15 cm apart and found to be 140°C and 100°C, when the atmospheric air is at 30°C with convection coefficient of 20 W/m2.K. Calculate the thermal conductivity of *.the rod material Consider a stainless steel spoon(k = 15.1 W/m.K), partially...
Heat Transfer Problems 1. A window pane (1/8 inch thick) in an old house owned by...
Heat Transfer
Problems 1. A window pane (1/8 inch thick) in an old house owned by a professor is 3 ft. by 4 ft. He likes to be warm in the winter so the inside temperature is kept at 70 °F even when the outside temperature is 10 •F. For this problem assume the inside and outside temperatures are for the window surface. How much heat is transferred through the window (k=.54 BTU/hr ft ° F)? 2. A small heated...
this is a mechanical engineering question heat transfer Problem 3: An array of six square silicon chips, each 12 mm lon...
this is a mechanical engineering question heat
transfer
Problem 3: An array of six square silicon chips, each 12 mm long on a side, are laid side by side on a motherboard. They are insulated on the bottom surface and exposed to cooling airflow on the top surface, at a velocity of 20 m/s and an air temperature of 20°C. The chips all dissipate the same power such that they maintain a uniform heat flux condition at their top surface...
A 69-cm x 69-cm circuit board that contains 121 square chips on one side is to...
A 69-cm x 69-cm circuit board that contains 121 square chips on one side is to be cooled by combined natural convection and radiation by mounting it on a vertical surface in a room at 25°C. Each chip dissipates 0.18 W of power, and the emissivity of the chip surfaces is 0.7. Assume the heat transfer from the back side of the circuit board to be negligible, and the temperature of the surrounding surfaces to be the same as the...
A square loop with sides of length w = 3 cm moves with constant velocity v...
A square loop with sides of length w = 3 cm moves with constant velocity v = 4 m/s away from a long wire that carries a current I = 110 mA in the plane of the loop. The total resistance of the loop is R = 2 ohms. a. Calculate the magnetic flux through the loop when the closest side of the loop is parallel to, and a distance of r = 5 cm from, the wire. b. What...
265 A person is found dead at 5 p.m. in a room where temperature is 20°C....
265 A person is found dead at 5 p.m. in a room where temperature is 20°C. The (1 temperature of the body is measured to be 25°C when found, and the heat transfer coefficient is estimated to be 8 W/m2.K. Modelling the human body a 30 cm diameter, 1.70 m long cylinder.calculate actual time in hours) of death of the person. Take thermophysical properties of the body :k = 6.08 * W/m.K, p = 900 kg/m3,C = 4000 J/kg.K إجابت...
Two large parallel plates with surface conditions approximating those of a blackbody are maintained at 800°C...
Two large parallel plates with surface conditions approximating those of a blackbody are maintained at 800°C and 100°C, respectively. Determine the rate of heal transfer by radiation between the plates in Wim and the radiative heat transfer coefficient in W/m K ) 12 Write down the one-dimensional sent heal conduction equation for a plane wall with constant thermal conductivity and heat generation in its simplest form, and indicate what each variable represents 13 Write down the one-dimensional transient heat conduction...
Consider a long solid bar (K=45 W/m*k and ∝=12x10-6 m2/s) of square cross section that is infinity at uniform temperatu...
Consider a long solid bar (K=45 W/m*k and ∝=12x10-6 m2/s) of
square cross section that is infinity at uniform temperature of
450°C. The cross section of the bar is 20cmx20cm in size. All four
sides of the bar are subjected to convection of ambient air at
T=20°C with a heat transfer coefficient of (h=40 W/m2*K) Using the
explicit finite difference method with a mesh (Δx=Δy = 10 cm),
determine the centerline temperature “C” of the bar after 5
minutes.
Question...
wall with a base A long fin (square in cross-section, 2 mm on one side) projects from a temperature of 80°C. The fin is aluminum, with k 200 W/m-K. At a length of 2 cm, the temperature is measured and found to be 50°C. The surrounding air is at 25°C What is the convective heat transfer coefficient?
1. A square column measuring 15 cm on each side is poured with concrete (stone mix) with a 2.5 cm diameter circular pipe in the center. The pipe carries hot water such that the surface of the pipe is maintained at a constant temperature of 80 °C. Calculate the temperature of the column surface if the heat transfer in the column is 200 W per meter of column length
Heat Transfer
Problems 1. A window pane (1/8 inch thick) in an old house owned by a professor is 3 ft. by 4 ft. He likes to be warm in the winter so the inside temperature is kept at 70 °F even when the outside temperature is 10 •F. For this problem assume the inside and outside temperatures are for the window surface. How much heat is transferred through the window (k=.54 BTU/hr ft ° F)? 2. A small heated...
this is a mechanical engineering question heat
transfer
Problem 3: An array of six square silicon chips, each 12 mm long on a side, are laid side by side on a motherboard. They are insulated on the bottom surface and exposed to cooling airflow on the top surface, at a velocity of 20 m/s and an air temperature of 20°C. The chips all dissipate the same power such that they maintain a uniform heat flux condition at their top surface...
265 A person is found dead at 5 p.m. in a room where temperature is 20°C. The (1 temperature of the body is measured to be 25°C when found, and the heat transfer coefficient is estimated to be 8 W/m2.K. Modelling the human body a 30 cm diameter, 1.70 m long cylinder.calculate actual time in hours) of death of the person. Take thermophysical properties of the body :k = 6.08 * W/m.K, p = 900 kg/m3,C = 4000 J/kg.K إجابت...
Two large parallel plates with surface conditions approximating those of a blackbody are maintained at 800°C and 100°C, respectively. Determine the rate of heal transfer by radiation between the plates in Wim and the radiative heat transfer coefficient in W/m K ) 12 Write down the one-dimensional sent heal conduction equation for a plane wall with constant thermal conductivity and heat generation in its simplest form, and indicate what each variable represents 13 Write down the one-dimensional transient heat conduction...
Consider a long solid bar (K=45 W/m*k and ∝=12x10-6 m2/s) of
square cross section that is infinity at uniform temperature of
450°C. The cross section of the bar is 20cmx20cm in size. All four
sides of the bar are subjected to convection of ambient air at
T=20°C with a heat transfer coefficient of (h=40 W/m2*K) Using the
explicit finite difference method with a mesh (Δx=Δy = 10 cm),
determine the centerline temperature “C” of the bar after 5
minutes.
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