a rectangular-shaped stove is 10 cm long and extends 1 m (n the direction of the paper). The stove is held at a constant temperature of 1834oC and the surrounding ambient is held at a constant 20oC. Air blows across the stove at a velocity of 15 m/s. Determine the convective heat transfer.
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a rectangular-shaped stove is 10 cm long and extends 1 m (n the
direction of the...
finite element method 2. Aluminum fins with rectangular profiles (5 mm wide and 1 mm thick) are used to remove heat...
finite element method
2. Aluminum fins with rectangular profiles (5 mm wide and 1 mm thick) are used to remove heat from a surface whose temperature is 150°C. The temperature of ambient air is 20°C. The thermal conductivity of aluminium is 168 W/m.K. The natural convective coefficient associated with the surrounding air is 35 W/m2.K. The fins are 150 mm long and the heat loss from the tip of the fin may be neglected. (a) Determine the temperature distribution along...
3) A rectangular HVAC duct of cross-section 20 cm X 20 cm and 12 m long...
3) A rectangular HVAC duct of cross-section 20 cm X 20 cm and 12 m long is made of 3.5 mm thick sheet metal that is used to deliver hot air at 60°C with an average velocity of 4 m/s. The thermal resistance of the duct is negligible, and the outer surface of the duct, whose emissivity is 0.305, is exposed to the cold air at 10 C in the room, with a convection heat transfer coefficient of 10 W/m²....
Problem 2 (10/30) - Steam at 180 C (saturated) enters a 10 cm diameter, 0.4 mm thick, 150 m long carbon steel pipe which is exposed to the elements. Air flows across the pipe at 10 m/sec. Air emperat...
Problem 2 (10/30) - Steam at 180 C (saturated) enters a 10 cm diameter, 0.4 mm thick, 150 m long carbon steel pipe which is exposed to the elements. Air flows across the pipe at 10 m/sec. Air emperature is 20 C. Convective heat transfer of stem to the pipe is very high. Emissivity of the pipe is estimated at 0.8.Calculate the rate of heat transfer from the pipe. State any assumptions.
Problem 2 (10/30) - Steam at 180 C...
Problem 2 A brass tube of inner and outer diameters D,-2 cm and Do-3 cm, respectively, is used to...
Problem 2 A brass tube of inner and outer diameters D,-2 cm and Do-3 cm, respectively, is used to transfer heat from ambient air flowing across the tube to cold refrigerant (R-22) flowing inside the tube. The ambient air is flowing at un-0.1 m/s, and To 30°C. The cold refrigerant flow rate is m 1 gs, and its mean temperature is Tm-20°C. (a) Find the overall heat transfer coefficient, UA (b) To enhance the heat transfer, 16 straight fins of...
Lecture Assignment #7 A heat sink is composed of an array of rectangular fins. h-63 W/m-K...
Lecture Assignment #7 A heat sink is composed of an array of rectangular fins. h-63 W/m-K T 35°C a=2 mm b-2 mm FL-14 mm W-24 cm th, 0.75 cm k-35 W/m-K p 8200 kg/m The heat sink is square with base side dimension W 24 cm and base thickness ths- 0.75 cm. The fins are square and have side dimension a 2 mm and length L 14 mm. Fins are separated by a distance b 2 mm. (Note that there...
The components of an electronic system dissipating 150W are located in a 1 m long horizontal...
The components of an electronic system dissipating 150W are located in a 1 m long horizontal duct whose cross section is 15 cm x 15 cm. The components in the duct are cooled by forced air, which enters at 25°C at a rate of 0.4 m3/min and leaves at 45°C The surfaces of the sheet metal duct are not painted, and thus radiation heat transfer from the outer surfaces is negligible. If the ambient air temperature is 25°C, determine (a)...
Q2 A main trunk duct of air-conditioning system shown in Figure 2 is rectangular in cross-section...
Q2 A main trunk duct of air-conditioning system shown in Figure 2 is rectangular in cross-section (40 cm x 80 cm). Air at atmospheric pressure and temperature of 20c flows inside the duct with velocity of 7 m/s. The cross sectional srea snd definition of characteristic length for the duct are given in Figure 2. The duct is assumed to be m long. The flow inside the duct is assumed fully developed. (a)Find properties of air using suitable value of...
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...
QUESTION 3 Consider a very long rectangular fin attached to a flat surface such that the...
QUESTION 3 Consider a very long rectangular fin attached to a flat surface such that the temperature at the end of the finis essentially that of the surrounding air, le 10°C its width is 10 cm; thickness is 2 mm: thermal conductivity is 150 Wim K and base temperature is 100'C. The heat transfer coefficient is 20 W/ m K Estimate (a) the fin temperature at a distance of 5.0 cm from the base in c to the nearest degree...
Air at 0.8 atm and 22 °C flows across a 40 cm square plate with a...
Air at 0.8 atm and 22 °C flows across a 40 cm square plate with a velocity of 10 m/s. The plate temperature is maintained at 120 °C. What is the average convective heat transfer coefficient? what is the rate of heat transfer in W? Ans. q = 268.8 W a. b.
finite element method
2. Aluminum fins with rectangular profiles (5 mm wide and 1 mm thick) are used to remove heat from a surface whose temperature is 150°C. The temperature of ambient air is 20°C. The thermal conductivity of aluminium is 168 W/m.K. The natural convective coefficient associated with the surrounding air is 35 W/m2.K. The fins are 150 mm long and the heat loss from the tip of the fin may be neglected. (a) Determine the temperature distribution along...
3) A rectangular HVAC duct of cross-section 20 cm X 20 cm and 12 m long is made of 3.5 mm thick sheet metal that is used to deliver hot air at 60°C with an average velocity of 4 m/s. The thermal resistance of the duct is negligible, and the outer surface of the duct, whose emissivity is 0.305, is exposed to the cold air at 10 C in the room, with a convection heat transfer coefficient of 10 W/m²....
Problem 2 (10/30) - Steam at 180 C (saturated) enters a 10 cm diameter, 0.4 mm thick, 150 m long carbon steel pipe which is exposed to the elements. Air flows across the pipe at 10 m/sec. Air emperature is 20 C. Convective heat transfer of stem to the pipe is very high. Emissivity of the pipe is estimated at 0.8.Calculate the rate of heat transfer from the pipe. State any assumptions.
Problem 2 (10/30) - Steam at 180 C...
Problem 2 A brass tube of inner and outer diameters D,-2 cm and Do-3 cm, respectively, is used to transfer heat from ambient air flowing across the tube to cold refrigerant (R-22) flowing inside the tube. The ambient air is flowing at un-0.1 m/s, and To 30°C. The cold refrigerant flow rate is m 1 gs, and its mean temperature is Tm-20°C. (a) Find the overall heat transfer coefficient, UA (b) To enhance the heat transfer, 16 straight fins of...
Lecture Assignment #7 A heat sink is composed of an array of rectangular fins. h-63 W/m-K T 35°C a=2 mm b-2 mm FL-14 mm W-24 cm th, 0.75 cm k-35 W/m-K p 8200 kg/m The heat sink is square with base side dimension W 24 cm and base thickness ths- 0.75 cm. The fins are square and have side dimension a 2 mm and length L 14 mm. Fins are separated by a distance b 2 mm. (Note that there...
The components of an electronic system dissipating 150W are located in a 1 m long horizontal duct whose cross section is 15 cm x 15 cm. The components in the duct are cooled by forced air, which enters at 25°C at a rate of 0.4 m3/min and leaves at 45°C The surfaces of the sheet metal duct are not painted, and thus radiation heat transfer from the outer surfaces is negligible. If the ambient air temperature is 25°C, determine (a)...
Q2 A main trunk duct of air-conditioning system shown in Figure 2 is rectangular in cross-section (40 cm x 80 cm). Air at atmospheric pressure and temperature of 20c flows inside the duct with velocity of 7 m/s. The cross sectional srea snd definition of characteristic length for the duct are given in Figure 2. The duct is assumed to be m long. The flow inside the duct is assumed fully developed. (a)Find properties of air using suitable value of...
QUESTION 3 Consider a very long rectangular fin attached to a flat surface such that the temperature at the end of the finis essentially that of the surrounding air, le 10°C its width is 10 cm; thickness is 2 mm: thermal conductivity is 150 Wim K and base temperature is 100'C. The heat transfer coefficient is 20 W/ m K Estimate (a) the fin temperature at a distance of 5.0 cm from the base in c to the nearest degree...
Air at 0.8 atm and 22 °C flows across a 40 cm square plate with a velocity of 10 m/s. The plate temperature is maintained at 120 °C. What is the average convective heat transfer coefficient? what is the rate of heat transfer in W? Ans. q = 268.8 W a. b.
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