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3. A spherical ball having a diameter of 5 mm and at a temperature of 90°C...
III. Convective coefficient (40 pt). An electric wire having diameter of 6.0 mm and covered with...
III. Convective coefficient (40 pt). An electric wire having diameter of 6.0 mm and covered with a plastic insulation (thickness 2.0 mm; thermal conductivity: 0.4 W/m K) is exposed to air at 300 K. The heat loss per meter of wire generated is 200 W/m. Determine: ) Convective heat-transfer coefficient between the insulation and the surrounding air, h (25 pt) 2) Temperature of the insulation surface T2. (15 pt) HINT: T2 is a value between 320K and 400K To T2...
The boiling temperature of nitrogen at atmospheric pressure at sea level (1 atm pressure) is -196°C. Therefore, nitroge...
The boiling temperature of nitrogen at atmospheric pressure at sea level (1 atm pressure) is -196°C. Therefore, nitrogen is commonly used in low-temperature scientific studies since the temperature of liquid nitrogen in a tank open to the atmosphere will remain constant at -196°C until it is depleted. Any heat transfer to the tank will result in the evaporation of some liquid nitrogen, which has a heat of vaporization of 198 kJ/kg and a density of 810 kg/m3 at 1 atm....
Cold conditioned air at 10°C is flowing inside a 1.5 cm thick square aluminum (k = 240 w/mK) duct...
Cold conditioned air at 10°C is flowing inside a 1.5 cm thick square aluminum (k = 240 w/mK) duct of inner cross section of 25x25cm at a mass flow rate of 1.0 kg/s. The duct is exposed to air at 35°C with a combined convection-radiation heat transfer coefficient of 15 W/m2K. The convection heat transfer coefficient at the inner surface is 75 W/.m2.K. If the air temperature in the duct should not increase by more than 1°C determine the maximum...
Problem 3 (30): Steam at Too,1 340 °C flows in a cast iron pipe [k- 80 W/m.°C] whose inner and outer diameter are Di 6 cm and D2 -8 cm, respectively. The pipe is covered with a 4-cm thick glass wool...
Problem 3 (30): Steam at Too,1 340 °C flows in a cast iron pipe [k- 80 W/m.°C] whose inner and outer diameter are Di 6 cm and D2 -8 cm, respectively. The pipe is covered with a 4-cm thick glass wool insulation [k-0.05 W/ m°C]. Heat is lost to the surroundings at Too,2 - 21°C by natural convection and radiation, with a combined heat transfer coefficient of h- 18 W/m2 °C. Taking the heat transfer coefficient inside the pipe to...
A 2.2-mm-diameter and 10-m-long electric wire is tightly wrapped with a 1-mm-thick plastic cover whose thermal...
A 2.2-mm-diameter and 10-m-long electric wire is tightly wrapped with a 1-mm-thick plastic cover whose thermal conductivity is k0.15 W/m-K. Electrical measurements indicate that a current of 13 A passes through the wire and there is a voltage drop of 8 V along the wire. If the insulated wire is exposed to a medium at T 30°C with a heat transfer coefficient of h 24 W/m2 K, determine the temperature at the interface of the wire and the plastic cover...
G4 Problem Statement: Circular fins of uniform cross section, with diameter of 14 mm and length 7...
G4 Problem Statement: Circular fins of uniform cross section, with diameter of 14 mm and length 70 mm are attached to the wall with surface temperature o C. The fin is made of material with thermal conductivity of 210 W/mk, and exposed to an ambient air condition of 24 °C and the convection heat transfer coefficient of 190 W/m2k. f 300 1- Plot the temperature variation for the following boundary conditions a- Infinitely long fin b- Adiabatic fin tip c-...
A spherical tank (inside diameter 950 mm, wall thickness 6 mm) made of cast iron (k...
A spherical tank (inside diameter 950 mm, wall thickness 6 mm) made of cast iron (k = 57 W m-1 K -1 ) is to be used to store a vapour/liquid mixture at 2 °C while it is waiting to be used in an industrial process. Calculate the percentage reduction in the rate of heat infiltration (compared to the case of no insulation) if the tank is covered in a 35 mm layer of insulation (k = 0.04 W m-1...
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...
A black spherical ball (epsilon = 0.95) at 125°C is suspended in air. It loses heat...
A black spherical ball (epsilon = 0.95) at 125°C is suspended in air. It loses heat by convection to the surrounding air at 25°C with an associated convection heat transfer coefficient of 12 W·m-2·K-1 and by radiation to the surrounding surfaces at 15°C. Assuming steady state conditions, determine the heat transfer flux due to convection and radiation.
Al m diameter sphere is exposed to an en covered with a layer of insulation 2.5...
Al m diameter sphere is exposed to an en covered with a layer of insulation 2.5 cm thick whose thermal conductivity temperature of the sphere on the inside of the insulation is 315ºC. Assuming emissivity of 0.9, compute the value of the conve 's compute the value of the convection heat transfer coefficient that must be maintained on the outer surface of the insulation to ensure that the outer surface not exceed 41°C. exposed to an environmental temperature of 28°C....
III. Convective coefficient (40 pt). An electric wire having diameter of 6.0 mm and covered with a plastic insulation (thickness 2.0 mm; thermal conductivity: 0.4 W/m K) is exposed to air at 300 K. The heat loss per meter of wire generated is 200 W/m. Determine: ) Convective heat-transfer coefficient between the insulation and the surrounding air, h (25 pt) 2) Temperature of the insulation surface T2. (15 pt) HINT: T2 is a value between 320K and 400K To T2...
The boiling temperature of nitrogen at atmospheric pressure at sea level (1 atm pressure) is -196°C. Therefore, nitrogen is commonly used in low-temperature scientific studies since the temperature of liquid nitrogen in a tank open to the atmosphere will remain constant at -196°C until it is depleted. Any heat transfer to the tank will result in the evaporation of some liquid nitrogen, which has a heat of vaporization of 198 kJ/kg and a density of 810 kg/m3 at 1 atm....
Cold conditioned air at 10°C is flowing inside a 1.5 cm thick square aluminum (k = 240 w/mK) duct of inner cross section of 25x25cm at a mass flow rate of 1.0 kg/s. The duct is exposed to air at 35°C with a combined convection-radiation heat transfer coefficient of 15 W/m2K. The convection heat transfer coefficient at the inner surface is 75 W/.m2.K. If the air temperature in the duct should not increase by more than 1°C determine the maximum...
Problem 3 (30): Steam at Too,1 340 °C flows in a cast iron pipe [k- 80 W/m.°C] whose inner and outer diameter are Di 6 cm and D2 -8 cm, respectively. The pipe is covered with a 4-cm thick glass wool insulation [k-0.05 W/ m°C]. Heat is lost to the surroundings at Too,2 - 21°C by natural convection and radiation, with a combined heat transfer coefficient of h- 18 W/m2 °C. Taking the heat transfer coefficient inside the pipe to...
A 2.2-mm-diameter and 10-m-long electric wire is tightly wrapped with a 1-mm-thick plastic cover whose thermal conductivity is k0.15 W/m-K. Electrical measurements indicate that a current of 13 A passes through the wire and there is a voltage drop of 8 V along the wire. If the insulated wire is exposed to a medium at T 30°C with a heat transfer coefficient of h 24 W/m2 K, determine the temperature at the interface of the wire and the plastic cover...
G4 Problem Statement: Circular fins of uniform cross section, with diameter of 14 mm and length 70 mm are attached to the wall with surface temperature o C. The fin is made of material with thermal conductivity of 210 W/mk, and exposed to an ambient air condition of 24 °C and the convection heat transfer coefficient of 190 W/m2k. f 300 1- Plot the temperature variation for the following boundary conditions a- Infinitely long fin b- Adiabatic fin tip c-...
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...
Al m diameter sphere is exposed to an en covered with a layer of insulation 2.5 cm thick whose thermal conductivity temperature of the sphere on the inside of the insulation is 315ºC. Assuming emissivity of 0.9, compute the value of the conve 's compute the value of the convection heat transfer coefficient that must be maintained on the outer surface of the insulation to ensure that the outer surface not exceed 41°C. exposed to an environmental temperature of 28°C....
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