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3) A rectangular HVAC duct of cross-section 20 cm X 20 cm and 12 m long...
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...
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...
AIR ENTER A 5-M-LONG SECTION OF A RECTANGULAR DUCT OF CROSS SECTION 12*18 CM MADE OF...
AIR ENTER A 5-M-LONG SECTION OF A RECTANGULAR DUCT OF CROSS SECTION 12*18 CM MADE OF COMMERCIAL STEEL AT 1 ATM AND 35ºc AT AN AVERAGE VEL OF 6M/S. DISGREGARDING THE ENTRANCE EFFECTS, DETERMINE THE FAN POWER NEEDED TO OVERCOME THE PRESSURE LOSSES IN THIS SECTION OF THE DUCT.
The components of an electronic system dissipating 150W are located in a 1 m long horizontal...
The components of an electronic system dissipating 150W are located in a 1 m long horizontal duct whose cross section is 15 cm x 15 cm. The components in the duct are cooled by forced air, which enters at 25°C at a rate of 0.4 m3/min and leaves at 45°C The surfaces of the sheet metal duct are not painted, and thus radiation heat transfer from the outer surfaces is negligible. If the ambient air temperature is 25°C, determine (a)...
The wall of a house is 3 m high, 10 m long and 30 cm thick;...
The wall of a house is 3 m high, 10 m long and 30 cm thick; it has an effective thermal conductivity of 10 W/m K. The outer surface of the wall has an emissivity of 0.75. On a winter night, the outer surface of this wall is at a temperature of 0 °C and the air is at a temperature of –10 °C. The heat transfer coefficient for the outside wall is 8 W/m2 K. The outside wall also...
Air enters a 10-m-long section of a rectangular duct of cross section 15 cm X 20 cm made of commercial steel at an average velocity of 7 m/s
Air enters a 10-m-long section of a rectangular duct of cross section 15 cm X 20 cm made of commercial steel at an average velocity of 7 m/s.(p = 1.145kg/m3 ,μ = 1.895x10-5kg/ms) and e=0.000045 m). For this pipe determine (a)the Reynolds number and decide weather the flow is laminar or turbulent (b) the head loss, (c) the pressure drop, and (d) the pumping power requirement to overcome this pressure drop.
A rectangular forced air heating duct is suspended from the ceiling of a basement whose air...
A rectangular forced air heating duct is suspended from the ceiling of a basement whose air and walls are at a temperature of ∞T∞=Tsur= 5°C. The duct is 15 m long, and its cross section is 350 mm × 188 mm. (1) For an uninsulated duct whose average surface temperature is 50°C, estimate the rate of heat loss from the duct. The surface emissivity and convection coefficient are approximately 0.5 and 4 W/m2·K, respectively. (2) If heated air enters the...
A circular cross-section heating duct of 50 cm diameter runs horizontally through the basement garage of...
A circular cross-section heating duct of 50 cm diameter runs horizontally through the basement garage of a large apartment complex. The ambient air and walls of the garage are at 17°C. At a location where the surface temperature of the duct is 40°C, determine the radiation contribution to the total heat loss per me ter length if 6-19. (i) the duct has an emittance of 0.7. (i) the duct is painted with aluminum paint with ε-02. Note: For the convection...
Exercise 10 Consider a 2-m-high electric hot water heater that has a diameter of 40 cm...
Exercise 10 Consider a 2-m-high electric hot water heater that has a diameter of 40 cm and maintains the hot water at 55°C. The tank is located in a small room whose average temperature is 27°C, and the heat transfer coefficients on the inner and outer surfaces of the heater are 50 and 12 W/m2.°C, respectively. The tank is placed in another 46-cm-diameter sheet metal tank of negligible thickness, and the space between the two tanks is filled with foam...
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...
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...
The components of an electronic system dissipating 150W are located in a 1 m long horizontal duct whose cross section is 15 cm x 15 cm. The components in the duct are cooled by forced air, which enters at 25°C at a rate of 0.4 m3/min and leaves at 45°C The surfaces of the sheet metal duct are not painted, and thus radiation heat transfer from the outer surfaces is negligible. If the ambient air temperature is 25°C, determine (a)...
A circular cross-section heating duct of 50 cm diameter runs horizontally through the basement garage of a large apartment complex. The ambient air and walls of the garage are at 17°C. At a location where the surface temperature of the duct is 40°C, determine the radiation contribution to the total heat loss per me ter length if 6-19. (i) the duct has an emittance of 0.7. (i) the duct is painted with aluminum paint with ε-02. Note: For the convection...
Exercise 10 Consider a 2-m-high electric hot water heater that has a diameter of 40 cm and maintains the hot water at 55°C. The tank is located in a small room whose average temperature is 27°C, and the heat transfer coefficients on the inner and outer surfaces of the heater are 50 and 12 W/m2.°C, respectively. The tank is placed in another 46-cm-diameter sheet metal tank of negligible thickness, and the space between the two tanks is filled with foam...
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