Radiation heat transfer occurs in an object that should place in vacuum space. (True or False) False O True Transferring heat from outside liquid to a composite wall and then to a gas and finally to a solid represents convection, conduction, convection and conduction respectively convection, conduction, convection and convection respectively conduction, conduction, convection and conduction respectively all of them None of them

Radiation heat transfer occurs in an object that should place in vacuum space. (True or False) False O True Transferring heat from outside liquid to a composite wall and then to a gas and finally to a solid represents convection, conduction, convection and conduction respectively convection, conduction, convection and convection respectively conduction, conduction, convection and conduction respectively all of them None of them

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter1: Basic Modes Of Heat Transfer

Section: Chapter Questions

Problem 1.56P: A pipe carrying superheated steam in a basement at 10C has a surface temperature of 150C. Heat loss...

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Similar questions

A pipe carrying superheated steam in a basement at 10C has a surface temperature of 150C. Heat loss from the pipe occurs by radiation (=0.6) and natural convection (hc=25W/m2K). Determine the percentage of the total heat loss by these two mechanisms.
Show that the rate of heat conduction per unit length through a long, hollow cylinder of inner radius ri and outer radius ro, made of a material whose thermal conductivity varies linearly with temperature, is given by qkL=TiTo(rori)/kmA where Ti = temperature at the inner surface To = temperature at the outer surface A=2(rori)/ln(ro/ri)km=ko[1+k(Ti+To)/2]L=lenthofcyclinder
Energy transfer by conduction is primarily restricted to liquids fluids gases solids Which is correct?
Consider a 0.6-m × 0.6-m thin square plate in a room at 30°C. Both sides of the plate are maintained at a temperature of 90°C. Determine the rate of heat transfer from the plate by natural convection if the plate is (a) vertical and (b) horizontal. (c) If the plate surface with an emissivity of ε= 0.6, also loses heat by radiation to the room walls at 30°C, can radiation loss be neglected?
An 8-m-internal-diameter spherical tank made of 1.5-cm-thick stainless steelAISI 302 is used to store iced water at 0°C. The tank is located in a roomwith temperature 25°C. The outer surface of the tank is black (emissivity, ε= 1), the heat transfer between the outer surface of the tank and thesurroundings is by natural convection and radiation. The convection heattransfer coefficients at the inner and the outer surfaces of the tank are 80W/m2K and 10W/m2K, respectively; and the outer surface temperature of thetank is 5°C. Draw the equivalent thermal circuit of the system. Determine the total heat transfer rate to the iced water in the tank and the total amount of ice at 0°C that melts after 24 hours.
A 0.2-m-long and 25-mm-thick vertical plate (k = 1.5 W/m∙K) separates the hot water from the cold air at 2°C. The plate surface exposed to the hot water has a temperature of 100°C, and the surface exposed to the cold air has an emissivity of 0.73. Determine the temperature of the plate surface exposed to the cold air (Ts,c). Hint: The Ts,c has to be found iteratively. Start the iteration process with an initial guess of 51°C for the Ts,c .
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The inner and outer surfaces of a 5-m x 6-m brick wallof thickness 30 cm and thermal conductivity 0.69 W/m · °C aremaintained at temperatures of 20°C and 5°C, respectively.Determine the rate of heat transfer through the wall, in W
Consider a 150 W incandescent lamp in a room at 25 °C. The filament of the lamp is 5 cm long and has a diameter of 0.5 mm. The emissivity of the filament is 0.90. The diameter of the glass bulb of the lamp is 8 cm. The inside surface temperature of the glass bulb is 150 °C. Determine: (a) the heat flux, in W∙m-2, on the surface of the filament, (b) the heat flux, in W∙m-2, on the surface of the glass bulb, and (c) the surface temperature of the filament. The surface area of a sphere is ? = 4??2, and the volume of a sphere is ? = (4?/3)?3.
A 6-m-internal-diameter spherical tank made of 1.5-cm-thick stainless steel (k = 15 W/m·K) is used to store iced water at 0°C in a room at 20°C. The walls of the room are also at 20°C. The outer surface of the tank is black (emissivity « = 1), and heat transfer between the outer surface of the tank and the surroundings is by natural convection and radiation. Assuming the entire steel tank to be at 0°C and thus the thermal resistance of the tank to be negligible, determine (a) the rate of heat transfer to the iced water in the tank and (b) the amount of ice at 0°C that melts during a 24-h period. The heat of fusion of water is 333.7 kJ/kg.
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