The top surface of the passenger car of a train moving at a velocity of 70 km/h is 2.8 m wide and 8 m long The top surface is absorbing solar radiation at a rate of 200 W/m², and the temperature of the ambient air is- 30°C. Assuming the roof of the car to be perfectly insulated and the radiation heat exchange with the surroundings to be small relative to convection, determine the equilibrium temperature of the top surface of the car. Properties of air at 30°C are: The conductivity k = 0.02588 W /m. °C, The kinematic viscosity v == 1.608 x 10-5 m²/s %3D The Prandtl number: Pr = 0.7282. Air 200 W/m2 30°C

The top surface of the passenger car of a train moving at a velocity of 70 km/h is 2.8 m wide and 8 m long The top surface is absorbing solar radiation at a rate of 200 W/m², and the temperature of the ambient air is- 30°C. Assuming the roof of the car to be perfectly insulated and the radiation heat exchange with the surroundings to be small relative to convection, determine the equilibrium temperature of the top surface of the car. Properties of air at 30°C are: The conductivity k = 0.02588 W /m. °C, The kinematic viscosity v == 1.608 x 10-5 m²/s %3D The Prandtl number: Pr = 0.7282. Air 200 W/m2 30°C

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

See similar textbooks

Similar questions

Consider a person standing in a room kept at 22°C at all times. Your house It has been observed that the inner surfaces of the walls, floor and ceiling are at an average temperature of 15°C. If this person's exposed surface area is 1.4 m2 and if the average external surface temperature is 30°C, this person and the surrounding surfaces Determine the radiation and heat transfer rate between One's emissivity, the Stefan-Boltzmann constant a=5,67x10 -8 W/m 2 K 4
The temperature of a tank in the form of liquid nitrogen is -10 ° C. Tank diameter is 16 cm. The amount of heat lost by convection and radiation from the tank to the environment is 65.5 W / m. Calculate the temperature of the environment where the tank is located .h = 4.35 W / m2K, e= 1.
The temperature of a cylindrical tank containing liquid nitrogen is -10 ° C. Tank diameter is 16 cm. The amount of heat lost by convection and radiation from the tank to the environment is 65.5 W / m. Calculate the temperature of the environment where the tank is located: h = 4.35 W / m2K, ∈ = 1.
When is the heat transfer through a fluid conduction and when is it convection? For which case is the rate of heat transfer higher? How does the convection heat transfer differ from the thermal conductivity of the fluid?
A horizontal pipe with a diameter of 18 cm and a length of 10 m, which contains hot oil and has a surface temperature of 383.8 ° C, has an atmospheric pressure of 760 mm Hg. It is located in an environment (open air) where the temperature is 25 °C. Determine the rate of heat transfer from the pipe to the air (the heat transferred by radiation will be neglected).
Solar radiation is incident on the glass cover of a solar collector at a rate of 700W/m². The glass of collector absorbs 88 percent of the incident radiation on it and has an emissivity of 0.9. The entire hot water needs of a family can be provided by a single collector of 1.2m height and 2m width. The temperature of the glass cover of the collector is measured to be 35C° on a day when the surrounding air temperature is 25C° and the wind is blowing at 30km/h. The effective sky temperature for radiation exchange between the glass cover and the open sky is -40C°. Water enters the tubes which attached to the absorber plate at a rate of 1kg/min. Assuming the back surface of the absorber plate to be heavily insulated and the only heat loss to occur through the glass cover, determine (a) the total rate of heat loss from the collector, (b) the collector efficiency, which is the ratio of the amount of heat transferred to the water to the solar energy incident on the collector, and (c) the…