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1. A square column measuring 15 cm on each side is poured with concrete (stone mix)...
Pressurized steam at 400 K flows through a long, thin-walled pipe of 0.6-m diameter. The pipe...
Pressurized steam at 400 K flows through a long, thin-walled pipe of 0.6-m diameter. The pipe is enclosed in a concrete (stone mix) casing that is of square cross section and 1.75 m on a side. The axis of the pipe is centered in the casing, and the outer surfaces of the casing are maintained at 300 K. What is the rate of heat loss per unit length of pipe, in W/m? q' = i W/m
Problem 2 (30%). Liquid nitrogen is used to cool hot air exhausting from a gas turbine....
Problem 2 (30%). Liquid nitrogen is used to cool hot air exhausting from a gas turbine. The exhausted air at 200 °c (T) flows into a circular pipe of diameter D 2.54 cm and length L 5 m at a velocity V= 10 m/s. The surface of the pipe is maintained at a constant temperature, T,-- 146°C. Determine the average convective coefficient and rate of heat transfer over the entire length of the pipe.
Two square wires are composed differently, see the figure of their cross-sections. Wire 1 is a...
Two square wires are composed differently, see the figure of their cross-sections. Wire 1 is a square wire of material A but with a circular center of material C. The diameter of the circular inside is equal to the length of side of the square. The second square wire has the same cross-sectional area as the first but is entirely comprised of material A. Both wires are the same length and setup to have the same temperature difference maintained between...
An aligned tube bank is constructed of 2.5-cm-diameter tubes with 15 rows of tubes with 7 tubes in each row. The tubes are maintained at 90°C, and atmospheric air is blown across them at 20°C and...
An aligned tube bank is constructed of 2.5-cm-diameter tubes with 15 rows of tubes with 7 tubes in each row. The tubes are maintained at 90°C, and atmospheric air is blown across them at 20°C and u00-12 m/s. The arrangement has S 3.75 cm and SL = 5.0 cm. Calculate (a) the heat transfer from the tube bank per meter of length, and (b) the air- side pressure dropkP
An aligned tube bank is constructed of 2.5-cm-diameter tubes with 15...
I. Design of Fins (35 pt). A stripping process produces a hot fluid (80°C) that flows...
I. Design of Fins (35 pt). A stripping process produces a hot fluid (80°C) that flows inside copper pipe of 20 cm diameter (the thickness of the pipe wall is negligible). Outside the pipe, there is air flow at ambient temperature (20 °C). In order to recirculate the fluid produced, it is necessary to cool it down. This can be achieved by installing ten circular fins per meter of pipe (see figure below). These fins have a thickness of 0.1...
1. A steel tube [k 15 W/(m.°C)] of outside diameter 7.6 cm and thickness 1.3 cm...
1. A steel tube [k 15 W/(m.°C)] of outside diameter 7.6 cm and thickness 1.3 cm is covered with an insulation material [k 0.2 W/(m. C)] of thickness 2 cm. A hot gas at 320°C with a heat transfer coefficient of 200 W/(m2.C) flows inside the tube. The outer surface of the insulation is exposed to cooler air at 20°C with a heat transfer coefficient of 50 W/(m2·°C). Calculate a) The heat loss from the tube to the air for...
Saturated steam at 190 °C is to be transported from a boiler to a heat exchanger....
Saturated steam at 190 °C is to be transported from a boiler to a heat exchanger. Due to improper design of existing building, the steam has to flow through a room, where the air temperature inside this room is maintained at 25 °C. The size of this room is very large compared to the size of pipe. The temperature of inner surface of this room is maintained at 30 °C. Below are two options for the shape of pipe: Dimension...
A 5-cm-diameter shaft rotates at 4500 rpm in a 15-cm long, 8-cm-outer-diameter cast iron bearing (k...
A 5-cm-diameter shaft rotates at 4500 rpm in a 15-cm long, 8-cm-outer-diameter cast iron bearing (k =70 W/m.K) with a uniform clearance of 0.6 mm filled wwith tubricating oil (u 0.03 N.s/m2 and k 0.14 W/m.K). The bearing is cooled externally by a liquid, and its outer surface is maintained at 40°C. Disregarding heat conduction through the shaft and assuming one- dimensional heat transfer, determine (a) the rate of heat transfer to the coolant, (b) the sutacs temperature of the...
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...
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?
Pressurized steam at 400 K flows through a long, thin-walled pipe of 0.6-m diameter. The pipe is enclosed in a concrete (stone mix) casing that is of square cross section and 1.75 m on a side. The axis of the pipe is centered in the casing, and the outer surfaces of the casing are maintained at 300 K. What is the rate of heat loss per unit length of pipe, in W/m? q' = i W/m
Problem 2 (30%). Liquid nitrogen is used to cool hot air exhausting from a gas turbine. The exhausted air at 200 °c (T) flows into a circular pipe of diameter D 2.54 cm and length L 5 m at a velocity V= 10 m/s. The surface of the pipe is maintained at a constant temperature, T,-- 146°C. Determine the average convective coefficient and rate of heat transfer over the entire length of the pipe.
An aligned tube bank is constructed of 2.5-cm-diameter tubes with 15 rows of tubes with 7 tubes in each row. The tubes are maintained at 90°C, and atmospheric air is blown across them at 20°C and u00-12 m/s. The arrangement has S 3.75 cm and SL = 5.0 cm. Calculate (a) the heat transfer from the tube bank per meter of length, and (b) the air- side pressure dropkP
An aligned tube bank is constructed of 2.5-cm-diameter tubes with 15...
I. Design of Fins (35 pt). A stripping process produces a hot fluid (80°C) that flows inside copper pipe of 20 cm diameter (the thickness of the pipe wall is negligible). Outside the pipe, there is air flow at ambient temperature (20 °C). In order to recirculate the fluid produced, it is necessary to cool it down. This can be achieved by installing ten circular fins per meter of pipe (see figure below). These fins have a thickness of 0.1...
1. A steel tube [k 15 W/(m.°C)] of outside diameter 7.6 cm and thickness 1.3 cm is covered with an insulation material [k 0.2 W/(m. C)] of thickness 2 cm. A hot gas at 320°C with a heat transfer coefficient of 200 W/(m2.C) flows inside the tube. The outer surface of the insulation is exposed to cooler air at 20°C with a heat transfer coefficient of 50 W/(m2·°C). Calculate a) The heat loss from the tube to the air for...
Saturated steam at 190 °C is to be transported from a boiler to a heat exchanger. Due to improper design of existing building, the steam has to flow through a room, where the air temperature inside this room is maintained at 25 °C. The size of this room is very large compared to the size of pipe. The temperature of inner surface of this room is maintained at 30 °C. Below are two options for the shape of pipe: Dimension...
A 5-cm-diameter shaft rotates at 4500 rpm in a 15-cm long, 8-cm-outer-diameter cast iron bearing (k =70 W/m.K) with a uniform clearance of 0.6 mm filled wwith tubricating oil (u 0.03 N.s/m2 and k 0.14 W/m.K). The bearing is cooled externally by a liquid, and its outer surface is maintained at 40°C. Disregarding heat conduction through the shaft and assuming one- dimensional heat transfer, determine (a) the rate of heat transfer to the coolant, (b) the sutacs temperature of the...
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...
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?
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