transfer rate from air to water, (b) The overall heat transfer coefficient, and (C) the length of the tube needed. (35%) Hot air 177℃, 20m/s D-1.00cm Water T-20'C,0.2 kg/s Hint: 0.62RePrRep [1 +(4/Pr)2 314282000 1/3 D5/8 14/5 For cross flow over a cylinder: Nup -0.3+ The air properties are : u-26.4x10-6 m2/s ; k-o0338W/mk ; α-38.3x10-6 m2/s For water flow inside the tube, you may use an appropriate correlation in the appendix. The wate properties are: u:532×10-7 m2 /s; k =0.631 W/mK: α-1.52x10 7m2/s
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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...
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...
A concentric tube heat exchanger for cooling lubricating oil consists of a thin-walled inner tube of...
A concentric tube heat exchanger for cooling lubricating oil
consists of a thin-walled inner tube of 25 mm diameter carrying
water and an outer tube of 45 mm diameter carrying the oil. The
exchanger operates in countercurrent flow with an overall heat
transfer coefficient of 55 W/m2 K and the tabulated average
properties given below. Mass flow rates of oil and water are both
0.1 kg/s, oil enters the exchanger at 100°C, and water enters the
exchanger at 30°C. (a)...
please do 11.33 11.32 A single-pass, cross-flow heat exchanger uses hot exhaust gases (mixed) to heat...
please do 11.33
11.32 A single-pass, cross-flow heat exchanger uses hot exhaust gases (mixed) to heat water (unmixed) from 30 to 80°C at a rate of 3 kg/s. The exhaust gases, hav- ing thermophysical properties similar to air, enter and exit the exchanger at 225 and 100°C, respectively. If the overall heat transfer coefficient is 200 W/m2.K, estimate the required surface area. 11.33 Consider the fluid conditions and overall heat transfer coefficient of Problem 11.32 for a concentric tube heat...
QUESTION 1: Heat Exchanges A concentric tube parallel floween s hot water saturated liquid from 30...
QUESTION 1: Heat Exchanges A concentric tube parallel floween s hot water saturated liquid from 30 to 90%Catate of St. The exh , having thermopla properties similar to air, enter and exit the exchange 254 and 100 p ectively. The heat force 1000 W/mK The water pipe has a diameter of 50 cm a) Determine the required length for the exchanger. b) Assuming water flow inside the tube to be fully developed, estimate the convection heat transfer coefficient c) If...
this is the full problem. 11.1 An industrial boiler consists of tubes inside of which flow hot combustion gases. Water...
this is the full problem.
11.1 An industrial boiler consists of tubes inside of which flow hot combustion gases. Water boils on the exterior of the tubes. When installed, the clean boiler has an over- all heat transfer coefficient of 300 W/m2- K. Based on experience, it is anticipated that the fouling factors on the inner and outer surfaces will increase linearly with time as Rat and R = at where a;= 2.5 x 10-1" m2- K/Ws and a =...
A liquid (NOT WATER) is passed through a tube with a square cross section of 0.01m...
A liquid (NOT WATER) is passed through a tube with a square cross section of 0.01m x 0.01m at a Reynolds number of 2,000. The liquid has a Prandtl number of 1, a thermal conductivity of 0.2 W/mK, and a heat capacity of 4,000 J/kg*K. Simultaneously, air is blown at a speed of 20 m/s and a temperature of 25°C over the outside of the tube such that the flow is perpendicular to one of the square sides. The liquid...
11.5 A heat recovery device involves transferring energy from the hot flue gases passing through ...
11.5 A heat recovery device involves transferring energy from the hot flue gases passing through an annular region to pressurized water flowing through the inner tube of the annulus. The inner tube has inner and outer diameters of 24 and 30 mm and is connected by eight struts to an insulated outer tube of 60-mm diameter. Each strut is 4 mm thick and is integrally fabricated with the inner tube from carbon steel (k 50 W/m K). 60 mm 30...
A heat recovery device involves transferring energy from the hot flue gases passing through an annular...
A heat recovery device involves transferring energy from the hot flue gases passing through an annular region to pressurized water flowing through the inner tube of the annulus. The inner tube has inner and outer diameters of 24 and 30 mm and is connected by 8 struts to an insulated outer tube of 65-mm diameter. Each strut is 3 mm thick and is integrally fabricated with the inner tube from carbon steel (k = 50 W/m-K). 71-1=3 mm D. D.2...
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...
Problem 3 (20 points) A cross-flow heat exchanger consists of a bundle of 32 tubes in a long duct. Hot water at 150°C and a mean velocity of 0.5 m/s enters the tubes having inner and outer diameters...
Problem 3 (20 points) A cross-flow heat exchanger consists of a bundle of 32 tubes in a long duct. Hot water at 150°C and a mean velocity of 0.5 m/s enters the tubes having inner and outer diameters of 10.2mm and 12.5mm and has to be cooled to 136°C. The tubes are made of steel of thermal conductivity k-40 W/m.K. Air at 10°c enters the exchanger (unfinned) with a volumetric flow rate of 1.0 m3/s. The convective heat transfer coefficient...
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...
A concentric tube heat exchanger for cooling lubricating oil
consists of a thin-walled inner tube of 25 mm diameter carrying
water and an outer tube of 45 mm diameter carrying the oil. The
exchanger operates in countercurrent flow with an overall heat
transfer coefficient of 55 W/m2 K and the tabulated average
properties given below. Mass flow rates of oil and water are both
0.1 kg/s, oil enters the exchanger at 100°C, and water enters the
exchanger at 30°C. (a)...
please do 11.33
11.32 A single-pass, cross-flow heat exchanger uses hot exhaust gases (mixed) to heat water (unmixed) from 30 to 80°C at a rate of 3 kg/s. The exhaust gases, hav- ing thermophysical properties similar to air, enter and exit the exchanger at 225 and 100°C, respectively. If the overall heat transfer coefficient is 200 W/m2.K, estimate the required surface area. 11.33 Consider the fluid conditions and overall heat transfer coefficient of Problem 11.32 for a concentric tube heat...
QUESTION 1: Heat Exchanges A concentric tube parallel floween s hot water saturated liquid from 30 to 90%Catate of St. The exh , having thermopla properties similar to air, enter and exit the exchange 254 and 100 p ectively. The heat force 1000 W/mK The water pipe has a diameter of 50 cm a) Determine the required length for the exchanger. b) Assuming water flow inside the tube to be fully developed, estimate the convection heat transfer coefficient c) If...
this is the full problem.
11.1 An industrial boiler consists of tubes inside of which flow hot combustion gases. Water boils on the exterior of the tubes. When installed, the clean boiler has an over- all heat transfer coefficient of 300 W/m2- K. Based on experience, it is anticipated that the fouling factors on the inner and outer surfaces will increase linearly with time as Rat and R = at where a;= 2.5 x 10-1" m2- K/Ws and a =...
A liquid (NOT WATER) is passed through a tube with a square cross section of 0.01m x 0.01m at a Reynolds number of 2,000. The liquid has a Prandtl number of 1, a thermal conductivity of 0.2 W/mK, and a heat capacity of 4,000 J/kg*K. Simultaneously, air is blown at a speed of 20 m/s and a temperature of 25°C over the outside of the tube such that the flow is perpendicular to one of the square sides. The liquid...
11.5 A heat recovery device involves transferring energy from the hot flue gases passing through an annular region to pressurized water flowing through the inner tube of the annulus. The inner tube has inner and outer diameters of 24 and 30 mm and is connected by eight struts to an insulated outer tube of 60-mm diameter. Each strut is 4 mm thick and is integrally fabricated with the inner tube from carbon steel (k 50 W/m K). 60 mm 30...
A heat recovery device involves transferring energy from the hot flue gases passing through an annular region to pressurized water flowing through the inner tube of the annulus. The inner tube has inner and outer diameters of 24 and 30 mm and is connected by 8 struts to an insulated outer tube of 65-mm diameter. Each strut is 3 mm thick and is integrally fabricated with the inner tube from carbon steel (k = 50 W/m-K). 71-1=3 mm D. D.2...
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...
Problem 3 (20 points) A cross-flow heat exchanger consists of a bundle of 32 tubes in a long duct. Hot water at 150°C and a mean velocity of 0.5 m/s enters the tubes having inner and outer diameters of 10.2mm and 12.5mm and has to be cooled to 136°C. The tubes are made of steel of thermal conductivity k-40 W/m.K. Air at 10°c enters the exchanger (unfinned) with a volumetric flow rate of 1.0 m3/s. The convective heat transfer coefficient...
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