![2. An iron ball of radius 5 cm is to be heated from 20°C to 100°C in 10 minutes. The average heat flux that needs to be supplied is: [P-8950 kg/m, C,-0.45 kJ/kg.C] 1636 W2100 6l6 Wm f h oe 1636 W/m 3616 W/m None of the above 5169](http://img.homeworklib.com/questions/0f546490-c890-11ea-86f5-372a37bf22ce.png?x-oss-process=image/resize,w_560)
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2. An iron ball of radius 5 cm is to be heated from 20°C to 100°C...
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...
1. Engine oil (c-2100 J/kg- C) is to be heated from 20 °C to 60 °C...
1. Engine oil (c-2100 J/kg- C) is to be heated from 20 °C to 60 °C at a rate of 0.3 kg/s in a 2-cm diameter thin-walled copper tube by condensing steam outside at a temperature of 130 °C (hfs 2174 kJ/kg) a. For an overall heat transfer coefficient of 650 W/m2-°C, determine the rate of heat transfer and the length of tube required to achieve it. Determine also the rate of steam condensation, in kgsteam/sec. (Ans: 25.2 kW; 7.0...
A long steel bar of radius R=2.5 cm, k =50 W/(m °C), p= 7800 kg/m), and...
A long steel bar of radius R=2.5 cm, k =50 W/(m °C), p= 7800 kg/m), and c = 0.5 kJ/(kg. . °C) is to be annealed by cooling slowly from 800.°C to 100.°C in an environment at temperature 50.°C. If the heat transfer coefficient between the environment and the surface of the bars is h = 45 W/(m .°C), determine the time required for the annealing process using lumped system analysis.
2. (25 points) A spherical metal ball of radius ris heated in an oven to a...
2. (25 points) A spherical metal ball of radius ris heated in an oven to a temperature of T; throughout and is then taken out of the oven and dropped into a large body of water at To where it is cooled by convection with an average convection heat transfer coefficient of h. It is given that there is no internal heat generation, that the thermal conductivity is constant, and that there are no temperature variations in the transient one-dimensional...
2. (10 points) A pharmaceutical fluid is sterilized by heating it from 25 to 75 °C...
2. (10 points) A pharmaceutical fluid is sterilized by heating it from 25 to 75 °C as it moves at 0.2 m/s through a straight thin-walled stainless steel tube of 12.7-mm diameter that is 10 m long. A uniform heat flux is maintained by an electric resistance heater wrapped around the outer surface of the straight tube. The pharmaceutical fluid properties may be approximated as: p = 1000 kg/mº, cp = 4 kJ/kg-K, u = 2.102 kg/s-m, k = 1...
1. Consider a 10.0 kg solid steel ball with a radius of 8.0 cm (0.080 m)...
1. Consider a 10.0 kg solid steel ball with a radius of 8.0 cm (0.080 m) rolling down a track of height h = 4.5 m without slipping. 4.50 m PLEASE SHOW ALL WORK AND CALCULATIONS. Answers W/O derivations will receive no credit. Partial Credit will be rewarded for answers with some errors. a. Calculate the moment of inertia for the ball b. Calculate the initial potential energy of the ball c. What is the velocity of the ball at...
At a festival, spherical balloons with a radius of 160. cm are to be inflated with...
At a festival, spherical balloons with a radius of 160. cm are to be inflated with hot air and released. The air at the festival will have a temperature of 25 °C and must be heated to 100 °C to make the balloons float. 1.00 kg of butane (C,Hfuel are available to be burned to heat the air. Calculate the maximum number of balloons that can be inflated with hot air. Here are some data you may find useful: Specific...
At a festival, spherical balloons with a radius of 220. cm are to be inflated with...
At a festival, spherical balloons with a radius of 220. cm are to be inflated with hot air and released. The air at the festival will have a temperature of 25 °C and must be heated to 100 °C to make the balloons float. 2.00 number of balloons that can be inflated with hot air. of butane (C4H10) fuel are available to be burned to heat the air. Calculate the maximum Here are some data you may find useful: J...
I 2) A uniform solid ball has a mass of 20 g and a radius of...
I 2) A uniform solid ball has a mass of 20 g and a radius of 5 cm. It rests on a horizontal surface. A sharp force is applied to the ball in the horizontal direction 9 cm above the surface. The force rises linearly from 0 to a peak value of 40,000 N in 10-* s and then decreases linearly to o in another 10- s. (The moment of inertia for a solid ball ismR?) a) What is the...
Water is to be heated from 10 °C to 83 °C as it flows through a...
Water is to be heated from 10 °C to 83 °C as it flows through a 0.015 m-internal-diameter, 13-m-long tube. The tube is equipped with an electric resistance heater, which provides uniform heating throughout the surface of the tube. The outer surface of the heater is well insulated, so that in steady operation all the heat generated in the heater is transferred to the water in the tube. The system provides hot water at a rate of 5 L/min Assumelp...
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...
1. Engine oil (c-2100 J/kg- C) is to be heated from 20 °C to 60 °C at a rate of 0.3 kg/s in a 2-cm diameter thin-walled copper tube by condensing steam outside at a temperature of 130 °C (hfs 2174 kJ/kg) a. For an overall heat transfer coefficient of 650 W/m2-°C, determine the rate of heat transfer and the length of tube required to achieve it. Determine also the rate of steam condensation, in kgsteam/sec. (Ans: 25.2 kW; 7.0...
A long steel bar of radius R=2.5 cm, k =50 W/(m °C), p= 7800 kg/m), and c = 0.5 kJ/(kg. . °C) is to be annealed by cooling slowly from 800.°C to 100.°C in an environment at temperature 50.°C. If the heat transfer coefficient between the environment and the surface of the bars is h = 45 W/(m .°C), determine the time required for the annealing process using lumped system analysis.
2. (25 points) A spherical metal ball of radius ris heated in an oven to a temperature of T; throughout and is then taken out of the oven and dropped into a large body of water at To where it is cooled by convection with an average convection heat transfer coefficient of h. It is given that there is no internal heat generation, that the thermal conductivity is constant, and that there are no temperature variations in the transient one-dimensional...
2. (10 points) A pharmaceutical fluid is sterilized by heating it from 25 to 75 °C as it moves at 0.2 m/s through a straight thin-walled stainless steel tube of 12.7-mm diameter that is 10 m long. A uniform heat flux is maintained by an electric resistance heater wrapped around the outer surface of the straight tube. The pharmaceutical fluid properties may be approximated as: p = 1000 kg/mº, cp = 4 kJ/kg-K, u = 2.102 kg/s-m, k = 1...
1. Consider a 10.0 kg solid steel ball with a radius of 8.0 cm (0.080 m) rolling down a track of height h = 4.5 m without slipping. 4.50 m PLEASE SHOW ALL WORK AND CALCULATIONS. Answers W/O derivations will receive no credit. Partial Credit will be rewarded for answers with some errors. a. Calculate the moment of inertia for the ball b. Calculate the initial potential energy of the ball c. What is the velocity of the ball at...
At a festival, spherical balloons with a radius of 160. cm are to be inflated with hot air and released. The air at the festival will have a temperature of 25 °C and must be heated to 100 °C to make the balloons float. 1.00 kg of butane (C,Hfuel are available to be burned to heat the air. Calculate the maximum number of balloons that can be inflated with hot air. Here are some data you may find useful: Specific...
At a festival, spherical balloons with a radius of 220. cm are to be inflated with hot air and released. The air at the festival will have a temperature of 25 °C and must be heated to 100 °C to make the balloons float. 2.00 number of balloons that can be inflated with hot air. of butane (C4H10) fuel are available to be burned to heat the air. Calculate the maximum Here are some data you may find useful: J...
I 2) A uniform solid ball has a mass of 20 g and a radius of 5 cm. It rests on a horizontal surface. A sharp force is applied to the ball in the horizontal direction 9 cm above the surface. The force rises linearly from 0 to a peak value of 40,000 N in 10-* s and then decreases linearly to o in another 10- s. (The moment of inertia for a solid ball ismR?) a) What is the...
Water is to be heated from 10 °C to 83 °C as it flows through a 0.015 m-internal-diameter, 13-m-long tube. The tube is equipped with an electric resistance heater, which provides uniform heating throughout the surface of the tube. The outer surface of the heater is well insulated, so that in steady operation all the heat generated in the heater is transferred to the water in the tube. The system provides hot water at a rate of 5 L/min Assumelp...
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