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Q2 A main trunk duct of air-conditioning system shown in Figure 2 is rectangular in cross-section...
2) (35 pt) Atmospheric air at 25 Centers a duct having a cross section of an...
2) (35 pt) Atmospheric air at 25 Centers a duct having a cross section of an equilateral triangle 2 cm on a side with a velocity of 1.5 m/s. The length of the duct is 10 m. A constant heat flux is imposed on the duct wall. The mean temperature of the air at the duct exit is 75 °C. a. Is the flow at the duct exit hydrodynamically and thermally fully developed? Show. T-75 °C b. Calculate the convection...
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 with the following problem and show work thank you 3. (20 pts) Preferred air...
Please help with the following problem and show work thank
you
3. (20 pts) Preferred air duct shape: You are trying to decide whether to use a square or a round air duct to cool the air inlet temperature is 50 °C) through the duct. a) (5 pts) Write the expression for the convective heat transfer rate on the interior of the round duct (expand fully in terms of properties, not just non-dimensional terms, but do not calculate), b) (5...
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.
Case Study 2 Convection) – 30 Marks Consider an air duct heater consists of electrical heating...
Case Study 2 Convection) – 30 Marks Consider an air duct heater consists of electrical heating elements with an aligned arrangement and the longitudinal (5) and transverse pitches (S.) of 5 = 5, = 22 mm. There are 3 rows of elements in the flow direction (N = 3) and 3 elements in each row (N = 3). The atmospheric air at a velocity of V = 10 m/s, and a temperature of. = 15°C enter the duct and flow...
4. Air at 200 °C is flowing inside rectangular tube (2cm x 6cm cross section) with...
4. Air at 200 °C is flowing inside rectangular tube (2cm x 6cm cross section) with velocity 10 m/s. The surface of rectangular tube is assumed as constant heat flux condition. The surface temperature is higher than bulk temperature) by 20 C. Assume the following heat transfer correlation in the rectangular tube. (40 point) 0.03Rea0Pr03 0.81 Nud (a) Calculate hydraulic diameter of the rectangular tube. (b) Calculate Reynolds number and convection heat transfer coefficient. (c) Calculate heat transfer rate for...
3) A rectangular HVAC duct of cross-section 20 cm X 20 cm and 12 m long...
3) A rectangular HVAC duct of cross-section 20 cm X 20 cm and 12 m long is made of 3.5 mm thick sheet metal that is used to deliver hot air at 60°C with an average velocity of 4 m/s. The thermal resistance of the duct is negligible, and the outer surface of the duct, whose emissivity is 0.305, is exposed to the cold air at 10 C in the room, with a convection heat transfer coefficient of 10 W/m²....
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?
Waste heat of exhaust hot air from a manufacturing process may be recovered by passing water through a thin-walled tube of 1.00 cm diameter as shown. Assume the temperature of the hot air is 177℃ in...
Waste heat of exhaust hot air from a manufacturing process may be recovered by passing water through a thin-walled tube of 1.00 cm diameter as shown. Assume the temperature of the hot air is 177℃ in cross flow with a velocity of 20 m/s over the tube. The inlet and outlet temperature of water are 20C and 60 C, rospectively, and the ilow rate is 0.2 k/s. Deiemine (a) the total heat transfer rate from air to water, (b) The...
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...
2) (35 pt) Atmospheric air at 25 Centers a duct having a cross section of an equilateral triangle 2 cm on a side with a velocity of 1.5 m/s. The length of the duct is 10 m. A constant heat flux is imposed on the duct wall. The mean temperature of the air at the duct exit is 75 °C. a. Is the flow at the duct exit hydrodynamically and thermally fully developed? Show. T-75 °C b. Calculate the convection...
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 with the following problem and show work thank
you
3. (20 pts) Preferred air duct shape: You are trying to decide whether to use a square or a round air duct to cool the air inlet temperature is 50 °C) through the duct. a) (5 pts) Write the expression for the convective heat transfer rate on the interior of the round duct (expand fully in terms of properties, not just non-dimensional terms, but do not calculate), b) (5...
Case Study 2 Convection) – 30 Marks Consider an air duct heater consists of electrical heating elements with an aligned arrangement and the longitudinal (5) and transverse pitches (S.) of 5 = 5, = 22 mm. There are 3 rows of elements in the flow direction (N = 3) and 3 elements in each row (N = 3). The atmospheric air at a velocity of V = 10 m/s, and a temperature of. = 15°C enter the duct and flow...
4. Air at 200 °C is flowing inside rectangular tube (2cm x 6cm cross section) with velocity 10 m/s. The surface of rectangular tube is assumed as constant heat flux condition. The surface temperature is higher than bulk temperature) by 20 C. Assume the following heat transfer correlation in the rectangular tube. (40 point) 0.03Rea0Pr03 0.81 Nud (a) Calculate hydraulic diameter of the rectangular tube. (b) Calculate Reynolds number and convection heat transfer coefficient. (c) Calculate heat transfer rate for...
3) A rectangular HVAC duct of cross-section 20 cm X 20 cm and 12 m long is made of 3.5 mm thick sheet metal that is used to deliver hot air at 60°C with an average velocity of 4 m/s. The thermal resistance of the duct is negligible, and the outer surface of the duct, whose emissivity is 0.305, is exposed to the cold air at 10 C in the room, with a convection heat transfer coefficient of 10 W/m²....
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?
Waste heat of exhaust hot air from a manufacturing process may be recovered by passing water through a thin-walled tube of 1.00 cm diameter as shown. Assume the temperature of the hot air is 177℃ in cross flow with a velocity of 20 m/s over the tube. The inlet and outlet temperature of water are 20C and 60 C, rospectively, and the ilow rate is 0.2 k/s. Deiemine (a) the total heat transfer rate from air to water, (b) The...
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...
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