![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 a 5-cm length of the tube. b) The temperature drops due to the thermal resistances of the hot gas flow, the steel tube, the insulation layer, and the outside air.](http://img.homeworklib.com/questions/b852ce80-cb03-11ea-917a-f78dae2f375a.png?x-oss-process=image/resize,w_560)
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1. A steel tube [k 15 W/(m.°C)] of outside diameter 7.6 cm and thickness 1.3 cm...
please help me ASAP 2. [10] COI A steel tube (ks - 43.26 W/mK) of 5.08...
please help me ASAP
2. [10] COI A steel tube (ks - 43.26 W/mK) of 5.08 cm inner diameter and 7.62 em outer diameter is covered with 2.5 cm layer of insulation (k, -0.208 W/mK) the inside surface of the tube receivers heat from a hot gas at the temperature of 316°C with heat transfer co-efficient of 28 W/mK. While the outer surface exposed to the ambient air at 30°C with heat transfer co- efficient of 17 W/mK. Calculate heat...
system, hot water at an average temperature of 80°C is flowing through a 15-m section of...
system, hot water at an average temperature of 80°C is flowing through a 15-m section of a cast In a heating iron pipe (k 50 W/m K) whose inner and outer diameters are 4 cm and 5 cm, respectively. The outer surface of the pipe, whose emissivity is 0.75, is exposed to the cold air at 10°C in the basement. with a heat transfer coefficient of 15 W/m2.K. The heat transfer coefficient at the inner surface of the pipe is...
Superheated steam flows steadily through steel tubing (k 35 W/m-K) applying a tube inner surface temperature...
Superheated steam flows steadily through steel tubing (k 35 W/m-K) applying a tube inner surface temperature of 575°C. The tubing has an inner diameter of 300 mm and a wall thickness of 30 mm. Insulation (k 0.10 W/m-K) is applied to the outer surface of the tube while thin aluminum sheet is applied around the insulation as a protective covering. The ambient air at 27°C provides a convection coefficient of 6 W/m2-K. Determine the minimum insulation thickness necessary (mm) to...
art II- Show your work 17 Marks team at 320°C flows in a stainless steel pipe...
art II- Show your work 17 Marks team at 320°C flows in a stainless steel pipe (kr 15 W/m "C) whose inner and outer diameters are 5 em and 5.5 cm, respectively. The pipe is covered with 3-cm-thick glass wool insulation (k 0.038 W m·°C). Heat is lost to the surroundings at 5°C by natural convection and radiation, with a combined natural convection and radiation heat transfer coefficient of hi-15 w/m.。C. The convective heat transfer coefficient inside the pipe to...
The wall of a furnace consists of two parts, a ceramic brick lining (k=1.1 W/m C,....
The wall of a furnace consists of two parts, a ceramic brick lining (k=1.1 W/m C,. l=20 mm) and an outer steel wall (k=50 W/ m C, l=10 mm). The inner heat transfer coefficient is 29 W/ m2 C and the outer heat transfer coefficient is 14 W/ m2 C. Taking the bulk temperature of the furnace to be 1000 C and the air temperature outside the furnace as 15 C calculate the temperature of the outer steel wall exposed...
For such aircraft application (Figure 3), a wall is made from insulation material (k-0.030 W/m.K) and...
For such aircraft application (Figure 3), a wall is made from insulation material (k-0.030 W/m.K) and the insulation material is mounted between four layers of carbon steel (2 mm thickness), the carbon layers are separated by a 2 mm air gap (kair-0.025 W/mK). Figure 3, the thermal conductivity of the carbon steel is (k-15.5 W/m.K). The temperature inside the wall is maintained at 6 °C. The environmental temperature is 24°C. The engineer would like to avoid condensation occurring at outer...
2-157 A long electrical resistance wire of radius r.-0.25 cm has a thermal conductivity kwire-15 W/m-K. Heat is gene...
2-157 A long electrical resistance wire of radius r.-0.25 cm has a thermal conductivity kwire-15 W/m-K. Heat is generated uniformly in the wire as a result of resistance heating at a constant rate of 0.5 W/cm3. The wire is covered with polyethylene insulation with a thickness of 0.25 cm and thermal conductivity of ks 0.4 W/m K. The outer surface of the insulation is subjected to free convection in air at 20°C and a convection heat transfer coefficient of 2...
NE Steel tubes (k =35 W/m2.K) of 400-mm inner diameter and 30-mm wall thickness are used...
NE Steel tubes (k =35 W/m2.K) of 400-mm inner diameter and 30-mm wall thickness are used to route superheated steam from the boller to the turbine in a power plant. Safety and economic concerns make it practical to add a 200-mm layer of Insulation (k =0.1 W/mK) to each tube, which is wrapped in a thin sheet of aluminum with an emissivity e =0.15. The air (with a convective coefficient h =5 W/m2K) and wail temperatures of the plant are...
An industrial freezer is designed to operate with an internal air temperature of -20 °C when...
An industrial freezer is designed to operate with an internal air temperature of -20 °C when the external air temperature is 25 °C and the internal and external heat transfer coefficients are 12 W/m2K and 8 W/m2.K respectively The walls of the freezer have a composite construction, comprising of an inner layer of plastic (k = 1 W/m•K, and thickness of 3 mm), and an outer layer of stainless steel (k = 16 W/mok, and thickness of 1 mm). Sandwiched...
Steam at 150 °C flows in a stainless steel pipe which has a thermal conductivity of...
Steam at 150 °C flows in a stainless steel pipe which has a thermal conductivity of 16 W m-1 K -1 whose inner and outer diameters are 5 and 6 cm respectively. The pipe is covered with 3 cm think insulation having a thermal conductivity of 0.035 W m-1 K -1 . The combined convection and radiation heat transfer coefficient at the outside surface of the insulation is 20 W m-2 K -1 and the surroundings are at 10 °C....
please help me ASAP
2. [10] COI A steel tube (ks - 43.26 W/mK) of 5.08 cm inner diameter and 7.62 em outer diameter is covered with 2.5 cm layer of insulation (k, -0.208 W/mK) the inside surface of the tube receivers heat from a hot gas at the temperature of 316°C with heat transfer co-efficient of 28 W/mK. While the outer surface exposed to the ambient air at 30°C with heat transfer co- efficient of 17 W/mK. Calculate heat...
system, hot water at an average temperature of 80°C is flowing through a 15-m section of a cast In a heating iron pipe (k 50 W/m K) whose inner and outer diameters are 4 cm and 5 cm, respectively. The outer surface of the pipe, whose emissivity is 0.75, is exposed to the cold air at 10°C in the basement. with a heat transfer coefficient of 15 W/m2.K. The heat transfer coefficient at the inner surface of the pipe is...
Superheated steam flows steadily through steel tubing (k 35 W/m-K) applying a tube inner surface temperature of 575°C. The tubing has an inner diameter of 300 mm and a wall thickness of 30 mm. Insulation (k 0.10 W/m-K) is applied to the outer surface of the tube while thin aluminum sheet is applied around the insulation as a protective covering. The ambient air at 27°C provides a convection coefficient of 6 W/m2-K. Determine the minimum insulation thickness necessary (mm) to...
art II- Show your work 17 Marks team at 320°C flows in a stainless steel pipe (kr 15 W/m "C) whose inner and outer diameters are 5 em and 5.5 cm, respectively. The pipe is covered with 3-cm-thick glass wool insulation (k 0.038 W m·°C). Heat is lost to the surroundings at 5°C by natural convection and radiation, with a combined natural convection and radiation heat transfer coefficient of hi-15 w/m.。C. The convective heat transfer coefficient inside the pipe to...
For such aircraft application (Figure 3), a wall is made from insulation material (k-0.030 W/m.K) and the insulation material is mounted between four layers of carbon steel (2 mm thickness), the carbon layers are separated by a 2 mm air gap (kair-0.025 W/mK). Figure 3, the thermal conductivity of the carbon steel is (k-15.5 W/m.K). The temperature inside the wall is maintained at 6 °C. The environmental temperature is 24°C. The engineer would like to avoid condensation occurring at outer...
2-157 A long electrical resistance wire of radius r.-0.25 cm has a thermal conductivity kwire-15 W/m-K. Heat is generated uniformly in the wire as a result of resistance heating at a constant rate of 0.5 W/cm3. The wire is covered with polyethylene insulation with a thickness of 0.25 cm and thermal conductivity of ks 0.4 W/m K. The outer surface of the insulation is subjected to free convection in air at 20°C and a convection heat transfer coefficient of 2...
NE Steel tubes (k =35 W/m2.K) of 400-mm inner diameter and 30-mm wall thickness are used to route superheated steam from the boller to the turbine in a power plant. Safety and economic concerns make it practical to add a 200-mm layer of Insulation (k =0.1 W/mK) to each tube, which is wrapped in a thin sheet of aluminum with an emissivity e =0.15. The air (with a convective coefficient h =5 W/m2K) and wail temperatures of the plant are...
An industrial freezer is designed to operate with an internal air temperature of -20 °C when the external air temperature is 25 °C and the internal and external heat transfer coefficients are 12 W/m2K and 8 W/m2.K respectively The walls of the freezer have a composite construction, comprising of an inner layer of plastic (k = 1 W/m•K, and thickness of 3 mm), and an outer layer of stainless steel (k = 16 W/mok, and thickness of 1 mm). Sandwiched...
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