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Estimate the time required to kook a hot dog in boiling water. Assume that the hot...
Waste heat of exhaust hot air from a manufacturing process may be recovered by passing water through a thin-walled tube of 1.00 cm diameter as shown. Assume the temperature of the hot air is 177℃ in...
Waste heat of exhaust hot air from a manufacturing process may be recovered by passing water through a thin-walled tube of 1.00 cm diameter as shown. Assume the temperature of the hot air is 177℃ in cross flow with a velocity of 20 m/s over the tube. The inlet and outlet temperature of water are 20C and 60 C, rospectively, and the ilow rate is 0.2 k/s. Deiemine (a) the total heat transfer rate from air to water, (b) The...
A hot fluid passes through a thin-walled tube of 10-mm diameter at 18 kg/h at a...
A hot fluid passes through a thin-walled tube of 10-mm diameter at 18 kg/h at a temperature of 85 C. On the outside, coolant flows across the tube at a velocity of 3 m/s at a temperature of 25 C. Neglecting the thermal resistance of the metal wall, calculate 1. (a) The two heat transfer coefficients, (b) Overall heat transfer coefficient, and (c) Cooling rate (in W/m) achieved in the given configuration Assume hot fluid properties are constant at the...
Bi = 0.01 D Question 3 9 pts A cylinder of length, 0.53 m and a...
Bi = 0.01 D Question 3 9 pts A cylinder of length, 0.53 m and a diameter of 0.04 m is initially at 32 Celsius. The cylinder is placed into a gas which has a temperature of 228 Celsius with a convection heat transfer coefficient of 209 W/m2 K. How long does it take for the cylinder to reach 100 Celsius (in seconds). The material properties of the cylinder are: k- 52 W/m K, density 8949 kg/m3, Cp-406 J/kg K....
Q3. A very long horizontal cylinder of Unobtainium, of diameter 100 mm, is initially at a...
Q3. A very long horizontal cylinder of Unobtainium, of diameter 100 mm, is initially at a uniform temperature of 500 K. The cylinder is cooled by a fan. The fan blow airs, with a temperature of 300 K, over the cylinder at a velocity of 6 m/s in a direction perpendicular to the axis of the cylinder. Calculate a) the average convective heat transfer coefficient at the beginning of the cooling process when the initial temperature of the cylinder is...
Please estimate the initial cooling rate from a cylindrical drink can, which is initially at 35...
Please estimate the initial cooling rate from a cylindrical drink can, which is initially at 35 C, in a refrigerator at 5 C, for two configurations: (a) the can is put vertically, (b) the can is put horizontally. Assuming that the diameter and height of the can are 6 cm and 12 cm, respectively. Neglect the possible heat transfer from end surfaces. (20%) Hint: You may use the Churchill and Chu's correlation to evaluate the heat transfer coefficient due to...
5. Hot water at 50 C is routed from one building in which it is generated...
5. Hot water at 50 C is routed from one building in which it is generated to an adjoining building in which it is used for space heating. Transfer between the buildings occurs in a steel pipe (k -60 W/mK) of 100-mm outside diameter and 8-mm wall thickness. During the winter, representative environmental conditions involve air at T=-5 C and V= 3 m/s in cross flow over the pipe (a) If the cost of producing the hot water is $0.10...
Required information After a long, hard week on the books, you and your friend are ready...
Required information After a long, hard week on the books, you and your friend are ready to relax and enjoy the weekend. You take a steak 54 mm thick from the freezer. Assume that the steak is initially at -8°C, that it thaws when the temperature at the center of the steak reaches 4°C, and that the room temperature is 22°C with a convection heat transfer coefficient of 10 W/m2.K. Neglect the heat of fusion associated with the melting phase...
4-79 White potatoes (k0.50 W/m-K and 0.13 X 10-6 m/s) that are initially at a uniform temperature of 25°C and have an a...
4-79 White potatoes (k0.50 W/m-K and 0.13 X 10-6 m/s) that are initially at a uniform temperature of 25°C and have an average diameter of 6 cm are to be cooled by refrigerated air at 2°C flowing at a velocity of 4 m/s. The average heat transfer coefficient between the potatoes and the air is experimentally determined to be 19 W/m2.K Determine how long t wl take for the center temperature of the potatoes to drop to 6°C. Also, determine...
25 PRR HEAT TRANSFER NAME: UNIT SIX AND SEVEN EXCHANGERS BOILING AND CONDENSATION, He- Solve the following problems:...
25 PRR HEAT TRANSFER NAME: UNIT SIX AND SEVEN EXCHANGERS BOILING AND CONDENSATION, He- Solve the following problems: 1. In a gas-faired boiler, water is boiler at 150 C by hot gases flowing through 59 m long, 5 cm outer diameter mechanically polished stailess-stell pipes submerged in water, If the outer surface temperature of the pipes is 180 °C. determine (a) the rate of heat transfer from the hot gases to water. (b) the rate of evaporation, (c) the ratio...
Problem 3 (50 points). A long stainless steel cylinder with diameter of d=55cm is heated up...
Problem 3 (50 points). A long stainless steel cylinder with diameter of d=55cm is heated up to 450°C. The cylinder is then cooled slowly in a chamber at 150°C with an average convection heat transfer coefficient of h = 70 W/m2.°C. (a) Find the temperature at the center of the cylinder after 25 min. (b) Find the heat transfer per unit length of the cylinder during this time period. Cylinder properties: k=15 W/m•°C, p=8000 kg/m², c=477 J/kg•°C, a=3.95x10-6 m²/s.
Waste heat of exhaust hot air from a manufacturing process may be recovered by passing water through a thin-walled tube of 1.00 cm diameter as shown. Assume the temperature of the hot air is 177℃ in cross flow with a velocity of 20 m/s over the tube. The inlet and outlet temperature of water are 20C and 60 C, rospectively, and the ilow rate is 0.2 k/s. Deiemine (a) the total heat transfer rate from air to water, (b) The...
A hot fluid passes through a thin-walled tube of 10-mm diameter at 18 kg/h at a temperature of 85 C. On the outside, coolant flows across the tube at a velocity of 3 m/s at a temperature of 25 C. Neglecting the thermal resistance of the metal wall, calculate 1. (a) The two heat transfer coefficients, (b) Overall heat transfer coefficient, and (c) Cooling rate (in W/m) achieved in the given configuration Assume hot fluid properties are constant at the...
Bi = 0.01 D Question 3 9 pts A cylinder of length, 0.53 m and a diameter of 0.04 m is initially at 32 Celsius. The cylinder is placed into a gas which has a temperature of 228 Celsius with a convection heat transfer coefficient of 209 W/m2 K. How long does it take for the cylinder to reach 100 Celsius (in seconds). The material properties of the cylinder are: k- 52 W/m K, density 8949 kg/m3, Cp-406 J/kg K....
Q3. A very long horizontal cylinder of Unobtainium, of diameter 100 mm, is initially at a uniform temperature of 500 K. The cylinder is cooled by a fan. The fan blow airs, with a temperature of 300 K, over the cylinder at a velocity of 6 m/s in a direction perpendicular to the axis of the cylinder. Calculate a) the average convective heat transfer coefficient at the beginning of the cooling process when the initial temperature of the cylinder is...
Please estimate the initial cooling rate from a cylindrical drink can, which is initially at 35 C, in a refrigerator at 5 C, for two configurations: (a) the can is put vertically, (b) the can is put horizontally. Assuming that the diameter and height of the can are 6 cm and 12 cm, respectively. Neglect the possible heat transfer from end surfaces. (20%) Hint: You may use the Churchill and Chu's correlation to evaluate the heat transfer coefficient due to...
5. Hot water at 50 C is routed from one building in which it is generated to an adjoining building in which it is used for space heating. Transfer between the buildings occurs in a steel pipe (k -60 W/mK) of 100-mm outside diameter and 8-mm wall thickness. During the winter, representative environmental conditions involve air at T=-5 C and V= 3 m/s in cross flow over the pipe (a) If the cost of producing the hot water is $0.10...
Required information After a long, hard week on the books, you and your friend are ready to relax and enjoy the weekend. You take a steak 54 mm thick from the freezer. Assume that the steak is initially at -8°C, that it thaws when the temperature at the center of the steak reaches 4°C, and that the room temperature is 22°C with a convection heat transfer coefficient of 10 W/m2.K. Neglect the heat of fusion associated with the melting phase...
4-79 White potatoes (k0.50 W/m-K and 0.13 X 10-6 m/s) that are initially at a uniform temperature of 25°C and have an average diameter of 6 cm are to be cooled by refrigerated air at 2°C flowing at a velocity of 4 m/s. The average heat transfer coefficient between the potatoes and the air is experimentally determined to be 19 W/m2.K Determine how long t wl take for the center temperature of the potatoes to drop to 6°C. Also, determine...
25 PRR HEAT TRANSFER NAME: UNIT SIX AND SEVEN EXCHANGERS BOILING AND CONDENSATION, He- Solve the following problems: 1. In a gas-faired boiler, water is boiler at 150 C by hot gases flowing through 59 m long, 5 cm outer diameter mechanically polished stailess-stell pipes submerged in water, If the outer surface temperature of the pipes is 180 °C. determine (a) the rate of heat transfer from the hot gases to water. (b) the rate of evaporation, (c) the ratio...
Problem 3 (50 points). A long stainless steel cylinder with diameter of d=55cm is heated up to 450°C. The cylinder is then cooled slowly in a chamber at 150°C with an average convection heat transfer coefficient of h = 70 W/m2.°C. (a) Find the temperature at the center of the cylinder after 25 min. (b) Find the heat transfer per unit length of the cylinder during this time period. Cylinder properties: k=15 W/m•°C, p=8000 kg/m², c=477 J/kg•°C, a=3.95x10-6 m²/s.
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