Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
8th Edition
ISBN: 9781305387102
Author: Kreith, Frank; Manglik, Raj M.
Publisher: Cengage Learning
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Chapter 5, Problem 5.56P
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
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During a cold winter day, wind at 55 km/h is blowing parallel to a 4m high and 10m long wall of a house. If the air outside is at 5 degrees Celsius and the surface temperature of the wall is 12 degrees Celsius , determine the rate of heat loss from the wall by convection. What would your answer be if the wind velocity has doubled?
From Table A-1:thermal conductivity, k = 0.0246 W/m degrees Celsiusviscosity, v = 1.4 x 10^-5 m^2/sPrandtl no. Pr = 0.717
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Chapter 5 Solutions
Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
Ch. 5 - Evaluate the Reynolds number for flow over a tube...Ch. 5 - 5.2 Evaluate the Prandtl number from the following...Ch. 5 - Evaluate the Nusselt number for flow over a sphere...Ch. 5 - 5.4 Evaluate the Stanton number for flow over a...Ch. 5 - Evaluate the dimensionless groups hcD/k,UD/, and...Ch. 5 - 5.6 A fluid flows at 5 over a wide, flat plate 15...Ch. 5 - 5.7 The average Reynolds number for air passing in...Ch. 5 - Prob. 5.8PCh. 5 - When a sphere falls freely through a homogeneous...Ch. 5 - 5.10 Experiments have been performed on the...
Ch. 5 - 5.13 The torque due to the frictional resistance...Ch. 5 - The drag on an airplane wing in flight is known to...Ch. 5 - 5.19 Suppose that the graph below shows measured...Ch. 5 - Engine oil at 100C flows over and parallel to a...Ch. 5 - For flow over a slightly curved isothermal...Ch. 5 - Air at 20C flows at 1 m/s between two parallel...Ch. 5 - Air at 1000C flows at an inlet velocity of 2 m/s...Ch. 5 -
5.43 A refrigeration truck is traveling at 130...Ch. 5 - The air-conditioning system in a Chevrolet van for...Ch. 5 - Determine the rate of heat loss from the wall of a...
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- Question No. 3: During a cold winter day, wind at 55 km/h is blowing parallel to a 4-m-high and 10-m-long wall of a house. If the air outside is at 5°C and the surface temperature of the wall is12°C, determine the rate of heat loss from that wall by convection. What would your answer be if the wind velocity was doubledarrow_forwardA long 10-cm-diameter steam pipe whose external surface temperature is 110°C passes through some open area that is not protected against the winds . Determine the rate of heat loss from the pipe per unit of its length when the air is at 1 atm pressure and 10°C and the wind is blowing across the pipe at a velocity of 8 m/s.arrow_forwardA cylindrical bottle with a diameter of 10 cm and a height of 30 cm contains cold water at 3 °C. The bottle is placed in windy air at 27°C. The temperature of the water is measured at 11 °C after 45 minutes of contact with the air. Neglecting radiation effects and heat transfer from the upper and lower surfaces, estimate the average wind speed. I need the solution from fundamental concepts of how the heat flow behaves in the systemarrow_forward
- The shooter holds a leather-covered baseball for a certain period of time, bringing the outer surface temperature of the ball to 30 ℃. Then the shooter throws the ball at 80 km/h to another athlete standing 18.5 meters away. It is known that the diameter of the ball is 7 cm and the air temperature is 20 ℃. Calculate the total heat transfer from the ball to the ambient air during flight, in Joules, assuming that the outer surface temperature of the ball remains constant throughout the shot. (When finding the properties, find the real values by interpolating. Ignore the air resistance.)arrow_forwardThe upper surface of a metal plate is being cooled with parallel air flow while its lower surface is subjected to a uniform heat flux of 810 W/m2. The air has a free stream velocity and temperature of 2.5 m/s and 15°C, respectively. Determine the surface temperature of the plate at x = 1.5 m from the leading edge. Hint: The surface temperature has to be found iteratively. Start the iteration process with an initial guess of 45°C for the surface temperature.arrow_forwardA long 9 cm-diameter steam pipe whose external surface temperature is 70 0C passes through some open area that is not protected against the winds. Determine the rate of heat loss from the pipe per unit of its length when the air is at 1 atm pressure and 5,6 0C and the wind is blowing across the pipe (pipe is vertical) at a velocity of 50 km/h.arrow_forward
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