Consider a 0.8-m-high and 1.5-m-wide glass window with a thickness of 8 mm and a thermal conductivity of k 0.78 W/m · °C. Determine the steady rate of heat transfer through this glass window and the temperature of its inner surface for a day during which the room is maintained at 20°C

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 1.19P: 1.19 A cryogenic fluid is stored in a 0.3-m-diameter spherical container is still air. If the...

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2.34 Show that the temperature distribution in a sphere of radius . made of a homogeneous material in which energy is released at a uniform rate per unit volume , is
1.19 A cryogenic fluid is stored in a 0.3-m-diameter spherical container is still air. If the convection heat transfer coefficient between the outer surface of the container and the air is 6.8 , the temperature of the air is 27°C, and the temperature of the surface of the sphere is –183°C, determine the rate of heat transfer by convection.
Q2/ Consider a 1.2-m-high and 2-m-wide glass window whose thickness is 6 mm and thermal conductivity is k = 0.78 W/m. °C. Determine the steady rate of heat transfer through this glass window and the temperature of its inner surface for a day during which the room is maintained at 24°C while the temperature of the outdoors is 5°C. Take the convection heat transfer coefficients on the inner and outer surfaces of the window to be h1 = 10 W/m2 °C and h2= 25 W/m2 °C, and disregard any heat transfer by radiation.
1- Consider a 1 m high and 2 m wide glass window whose thickness is 8 mm and thermal conductivity is k =0.68 W/m°C. Determine the steady rate of heat transfer through this glass window and temperature of its inner surface for a day during which the room is maintained at 22 °C while the temperature of the outdoors is -3 °C. Take convection heat transfer coefficients on the inner and outer surfaces of the window to be h, = 15 W/M2°C and h, = 20W/m°C .r
The brick wall of a house measures 4 x 7 m and has a thickness of 0.3 m. The thermal conductivity of the brick is 0.69 W/m.K. If the inner and outer temperatures of the wall are 26oC and 8oC respectively, determine the rate of heat transfer through the wall.
the composite wall of a refrigerator has a thermal conductivity of 0.05 W/m-K and a wall thickness of 50 mm. In a room of 25 °C, the refrigerated cold space inside the refrigerator is maintained at 4 °C. Assume the inner and outer convection heat transfer coefficients are 5 W/m² K and 10 W/m².K, respectively. Neglect radiation heat transfer. Determine the rate of heat leaking into the refrigerator per unit surface area.
+ Q1:1 Consider a 1.2-m-high and 2-m-wide glass window whose thickness is 6 mm and thermal conductivity is k = 0.78 W/m °C. Determine the steady rate of heat transfer through this glass window and the temperature of its inner surface for a day during which the room is maintained at 24°C while the temperature of the outdoors is 56 °C. Take the convection heat transfer coefficients on the inner and outer surfaces of the window to be h₁= 10 W/m² °C and h₂= 38 W/m² °C, and disregard any heat transfer by radiation.
8. Consider a 0.8-m-hight and 1.5-m-wide glass window with a thickness of 8 mm and a thermal conductivity of k = 0.78 W/m.°C. Determine the steady rate of heat transfer through this glass window and the temperature of its inner surface for a day during which the room is maintained at 20.°C while the temperature of the outdoors is 10 °C. Take the heat transfer coefficients on the inner and outer surfaces of the window to be 10 W/m2 "C and 40 W/m² °C , respectively .
A two-layer wall is made of two metal plates, with surface roughness of about 25 mm, pressed together at an average pressure of 10 MPa. The first layer is a stainless steel plate with a thickness of 5 mm and a thermal conductivity of 14 W/m∙K. The second layer is an aluminum plate with a thickness of 15 mm and a thermal conductivity of 237 W/m∙K. On the stainless steel side of the wall, the surface is subjected to a heat flux of 800 W/m2. On the aluminum side of the wall, the surface experiences convection heat transfer at an ambient temperature of 20°C, where the convection coefficient is 12 W/m2∙K. Determine the surface temperature of the stainless steel plate.
A wall of length "L" m and height "H" m is made from a thick bricklayer of 31 cm with thermal conductivity of 0.5 W/mK is subjected to heat transfer due to the outside temperature as 38 °C and inside temperature 27 °C. If the energy loss is 12702 kJ in 10 hours. Determine the Heat transfer rate, Surface Area and Length and Height of the wall, if L = 4 H.
1. Consider a 0.8 m high and 1.5 m wide glass window with a thickness of 8mm and a thermal conductivity of K-0.78 w/m.k. Determine the steady rate of heat transfer through this glass window and the temperature of its inner face for a day during which the room is maintaned at 20°C while temperature of the outdoors is -10°C. Take the heat transfer coeafficients on the inner and outer surfaces of the window to be h,-10 w/m'k and hy-40 w/m k
Example: A large plate of aluminum 5.0 cm thick and initially at 200◦C is suddenly exposed to the convection environment of 70◦C with heat-transfer coefficient of 525 W/m2 · ◦C. Calculate the temperature at a depth of 1.25 cm from one of the faces1 min after the plate has been exposed to the environment. How much energy has been removed per unit area from the plate in this time?