heat and mass question need help with the steps to do this problem
please ,both question 1 and 2
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heat and mass question need help with the steps to do this problem
please ,both question...
During its manufacture, plate glass at 600°C is cooled by passing air over its surface such...
During its manufacture, plate glass at 600°C is cooled by passing air over its surface such that the convection heat transfer coefficient is h. To prevent cracking, it is known that the temperature gradient must not exceed 15 °C/mm at any point in the glass during the cooling process. The thermal conductivity of the glass is 1.4 W/mK and its surface emissivity is 0.75. The temperature of the air that is used for the cooling is 315 °C. Assume that...
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...
please help me as soon as possible [20] SECTION B (Attempt any one Question) a) A...
please help me as soon as possible
[20] SECTION B (Attempt any one Question) a) A turbine blade 6 cm long and having a cross sectional area 4.65 cm and perimeter 12 cm is made of stainless steel (k=23.3 W/mK). The temperature at the root is 500 °C. The blade is exposed to a hot gas at 870 °C. The heat transfer coefficient between the blade surface and gas is 442 W/mK. Determine the temperature distribution and rate of heat...
(13) A brewery fermentation tank 12 m in diameter is situated in a room, which has...
(13) A brewery fermentation tank 12 m in diameter is situated in a room, which has a temperature of 15°C. The tank is constructed of 10-mm welded steel plate with 12-mm glass lining. The temperature at the inner surface of the glass lining is 50°C. Assume that the convective resistance offered by the air film on the outside of the tank equals the combined resistance of the glass and steel. The thermal conductivity of glass is 0.80 W/mK and that...
Please answet the the questions in detail it belong to Heat and Mass transfer Question2 Marks...
Please answet the the questions in detail it belong to
Heat and Mass transfer
Question2 Marks 191 In the context of a finite difference scheme for a material of thermal conductivity k, use an energy balance to derive the nodal equation for an extemal side node (illustrated) which is: heated by an electrical heater (generating surface heat flux q, W/m), .and cooled by convection (of heat transfer Tm+1,n coefficient h, W/m'K) into an ambient of air temperature T mn A...
QUESTION 1 Quarter of the area of a 5m x 3m outside wall of a house...
QUESTION 1 Quarter of the area of a 5m x 3m outside wall of a house is made of glass windows. The wall is 15 cm thick and has an average thermal conductivity of 0.8 W/m K. The window glass is 8 mm thick and has an average thermal conductivity of 0.15 W/m K. On a winter day the inside temperature of the wall and the glass is 20°C, and the outside air temperature is -10°C. The outside convection heat...
Heat Transfer Question Answer is given. Please show all work and how to reach the answer....
Heat Transfer Question
Answer is given. Please show all work and how to reach the
answer.
3.57 A composite cylindrical wall is composed of two materials of thermal conductivity k and kp, which are separated by a very thin, electric resistance heater for which interfacial contact resistances are negligible. Resistance heater r2 Internal flow T h A Ambient air T h Liquid pumped through the tube is at a temperature Ta and provides a convection coefficient h, at the inner...
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-...
Consider a 1.2-m-high and 2-m-wide double-pane window consisting of two 3-mm-thick layers of glass (k =...
Consider a 1.2-m-high and 2-m-wide double-pane window consisting of two 3-mm-thick layers of glass (k = 0.78 W/m K) separated by a 12-mm-wide stagnant air space (k = 0.026 W/m K). Determine the steady rate of heat transfer through this double-pane window. R . and all the surface temperatures (inner and outer of each pane) within the circuit (which you will draw and correctly label) for a day during which the room is maintained at 24°C while the temperature of...
Problem Wall with Strip Heater The air inside a chamber is measured to be 50C and used to convectively heat a wall (h 2...
Problem Wall with Strip Heater The air inside a chamber is measured to be 50C and used to convectively heat a wall (h 20 w/m2 K). The wall (thermal conductivity of 4 W/m K) is 200 mm thick and has a uniform heat generation of 1000 W/m2. To prevent any heat generated within the wall from being lost to the outside of the chamber a very thin electrical strip heater is placed on the outer wall to provide a uniform...
During its manufacture, plate glass at 600°C is cooled by passing air over its surface such that the convection heat transfer coefficient is h. To prevent cracking, it is known that the temperature gradient must not exceed 15 °C/mm at any point in the glass during the cooling process. The thermal conductivity of the glass is 1.4 W/mK and its surface emissivity is 0.75. The temperature of the air that is used for the cooling is 315 °C. Assume that...
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...
please help me as soon as possible
[20] SECTION B (Attempt any one Question) a) A turbine blade 6 cm long and having a cross sectional area 4.65 cm and perimeter 12 cm is made of stainless steel (k=23.3 W/mK). The temperature at the root is 500 °C. The blade is exposed to a hot gas at 870 °C. The heat transfer coefficient between the blade surface and gas is 442 W/mK. Determine the temperature distribution and rate of heat...
(13) A brewery fermentation tank 12 m in diameter is situated in a room, which has a temperature of 15°C. The tank is constructed of 10-mm welded steel plate with 12-mm glass lining. The temperature at the inner surface of the glass lining is 50°C. Assume that the convective resistance offered by the air film on the outside of the tank equals the combined resistance of the glass and steel. The thermal conductivity of glass is 0.80 W/mK and that...
Please answet the the questions in detail it belong to
Heat and Mass transfer
Question2 Marks 191 In the context of a finite difference scheme for a material of thermal conductivity k, use an energy balance to derive the nodal equation for an extemal side node (illustrated) which is: heated by an electrical heater (generating surface heat flux q, W/m), .and cooled by convection (of heat transfer Tm+1,n coefficient h, W/m'K) into an ambient of air temperature T mn A...
QUESTION 1 Quarter of the area of a 5m x 3m outside wall of a house is made of glass windows. The wall is 15 cm thick and has an average thermal conductivity of 0.8 W/m K. The window glass is 8 mm thick and has an average thermal conductivity of 0.15 W/m K. On a winter day the inside temperature of the wall and the glass is 20°C, and the outside air temperature is -10°C. The outside convection heat...
Heat Transfer Question
Answer is given. Please show all work and how to reach the
answer.
3.57 A composite cylindrical wall is composed of two materials of thermal conductivity k and kp, which are separated by a very thin, electric resistance heater for which interfacial contact resistances are negligible. Resistance heater r2 Internal flow T h A Ambient air T h Liquid pumped through the tube is at a temperature Ta and provides a convection coefficient h, at the inner...
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-...
Consider a 1.2-m-high and 2-m-wide double-pane window consisting of two 3-mm-thick layers of glass (k = 0.78 W/m K) separated by a 12-mm-wide stagnant air space (k = 0.026 W/m K). Determine the steady rate of heat transfer through this double-pane window. R . and all the surface temperatures (inner and outer of each pane) within the circuit (which you will draw and correctly label) for a day during which the room is maintained at 24°C while the temperature of...
Problem Wall with Strip Heater The air inside a chamber is measured to be 50C and used to convectively heat a wall (h 20 w/m2 K). The wall (thermal conductivity of 4 W/m K) is 200 mm thick and has a uniform heat generation of 1000 W/m2. To prevent any heat generated within the wall from being lost to the outside of the chamber a very thin electrical strip heater is placed on the outer wall to provide a uniform...
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