Calculate the convective heat transfer rate from a 40-cm diameter horizontal pipe whose surface is maintained at 95°C. This pipe is transporting hot water in a steam power plant. The temperature of air around the pipe is 25°C and the air is blowing across the pipe with a velocity of 0.2 mph. 1 mile = 1609 m.
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- Determine the rate of heat loss from the wall of a building resulting from a 16 km/h wind blowing parallel to its surface. The wall is 24 m long and 6 m high, its surface temperature is 27C, and the temperature of the ambient air is 4C.1.21 In an experimental set up in a laboratory, a long cylinder with a 5-cm diameter, and an electrical resistance heater inside its entire length is cooled with water flowing crosswise over the cylinder at and a velocity of 0.8 m/s. For these flow conditions, 20 kW/m of power is required to maintain a uniform temperature of at the surface of the cylinder. When water is not available, air at is used with a velocity of 10 m/s to maintain the same surface temperature. However, in this case, the cylinder surface heat dissipation rate is reduced to 400 W/m. Calculate the convection heat transfer coefficients for both water and air, and comment on the reason for the differences in the values.7.43 Liquid sodium is to be heated from 500 K to 600 K by passing it at a flow rate of 5.0 kg/s through a 5-cmID tube whose surface is maintained at 620 K. What length of tube is required?
- Determine the convection heat transfer coefficient (in W/m?.K) for air flowing at a velocity of 3 m/s in a 10-cm diameter and 10-m long tube. Air enters the tube at 10°C and leaves at 20°C, i.e. air is heated. Take the property of air at 1 atm and assume flow to be fully developed. For air at 1 atm: Temperature k, W/m-K v, m?/s Pr 15°C 0.02476 1.470x10-5 0.7323 20°C 0.02514 1.516x10-5 0.7309 25°C 0.02551 1.562x105 0.7296 Hint: When the fluid temperature changes, we use its properties at mean temperature, unless otherwise specified. Round your answer to 2 decimal places.Air at 27 ⁰C and 1 atm flows over a flat plate at a velocity of 3m/s, assuming the plate is heated its entire length to a temperature of 70⁰C. Heat transferred in first 25 cm of the plate is?Determine the convection heat transfer coefficient (in W/m2-K) for air flowing at a velocity of 3 m/s in a 10-cm diameter and 10-m long tube. Air enters the tube at 10°C and leaves at 20°C, i.e. air is heated. Take the property of air at 1 atm and assume flow to be fully developed. For air at 1 atm: Temperature k, W/m-K v, m?/s Pr 15°C 0.02476 1.470x10-5 0.7323 20°C 0.02514 1.516×10-5 0.7309 25°C 0.02551 1.562x105 0.7296
- Determine the convection heat transfer coefficient (in W/m²-K) for air flowing at a velocity of 3 m/s in a 10-cm diameter and 10-m long tube. Air enters the tube at 10°C and leaves at 20°C, i.e. air is heated. Take the property of air at 1 atm and assume flow to be fully developed. For air at 1 atm: Temperature k, W/m-K v, m?/s Pr 15°C 0.02476 1.470x105 0.7323 20°C 0.02514 1.516x10-5 0.7309 25°C 0.02551 1.562x105 0.7296 Hint: When the fluid temperature changes, we use its properties at mean temperature, unless otherwise specified. Round vour answer to2 decimal nlacesDetermine the convection heat transfer coefficient (in W/m2-K) for air flowing at a velocity of 8 m/s in a 10-cm diameter and 10-m long tube. Air enters the tube at 30°C and leaves at 20°C, i.e. air is cooled. Take the property of air at 1 atm and assume flow to be fully developed. For air at 1 atm: Temperature k, W/m-K v, m?/s Pr 15°C 0.02476 1.470x10-5 0.7323 20°C 0.02514 1.516x10-5 0.7309 25°C 0.02551 1.562x10-5 0.7296 Hint: When the fluid temperature changes, we use its properties at mean temperature, unless otherwise specified. Round your answer to 2 decimal places. Add vour answerDetermine the convection heat transfer coefficient (in W/m2-K) for air flowing at a velocity of 3 m/s in a 10-cm diameter and 10-m long tube. Air enters the tube at 10°C and leaves at 20°C, i.e. air is heated. Take the property of air at 1 atm and assume flow to be fully developed. For air at 1 atm: Temperature k, W/m-K v, m?/s Pr 15°C 0.02476 1.470x10-5 0.7323 20°C 0.02514 1.516x10-5 0.7309 25°C 0.02551 1.562x10-5 0.7296 Hint: When the fluid temperature changes, we use its properties at mean temperature, unless otherwise specified. Round your answer to 2 decimal places.
- Air at 300°C flows over a flat plate of dimensions 0.50m by 0.25m. If theconvection heat transfer coefficient is 250 W/m2K, determine the heat transferrate from air to one side of the plate when the plate is maintained at 40°C.(ans.8.125 KW)Engine oil at 54oC54oC flows over the upper surface of a 5m5m long plate whose temperature is 20oC20oC with a velocity of 2m/s2m/s. What is the heat transfer rate per unit width of the plate?For safety reasons, parts can be directly blown by air. with dimensions of 15 cmx20 cm, which are not allowed to contact printed circuit board, 20 cm long 0.2 opened inside Cold air from a rectangular hole of cmx14 cm will be cooled. from electronic parts The heat generated is transmitted from the thin layer of the card to the duct, where it is combined with the air entering the duct at a temperature of 15 °C. is removed. The heat flux on the upper surface of the channel can be considered uniform and The heat transfer from the surfaces can be neglected. If the velocity of the air in the duct does not exceed (590) m/min and the surface temperature of the duct is constant at 50 °C, this circuit board can be safely placed on it. Calculate the maximum total power of the electronic parts to be placed.