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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The composite wall of an oven consists of three materials, two of which are ofknown thermal conductivity, kA = 25 W/m ⋅ K and kC = 60 W/m ⋅ K, and knownthickness, LA = 0.40 m and LC = 0.20 m. The third material, B, which is sandwichedbetween materials A and C, is of known thickness, LB = 0.20 m, but unknownthermal conductivity kB. Under steady-state operating conditions, measurementsreveal an outer surface temperature of Ts,o = 20°C, an inner surface temperature ofTs,i = 600°C, and an oven air temperature of T∞ = 800°C. The inside convection coefficient h is known to be 25 W/m2 ⋅K. Neglecting convection transfer effect,what is the value of kB?
the hot combustion gasses of a furnace are separated from the ambient air and its surroundoing which are at 25c, by a brick wall 0.15 meter thick has a thermal conductivity of 1.2 w/(m-k) and a surface emissivity of 0.8. under steady state condition and outer surface temperature of 100c is measured. the convection heat transfer to the air adjoining this surface is characterized by a convection of 20 /(m-k), what is the inner temperature?
A semi - infinite slab that has a thermal conductivity of 0.2 W / m ° C and thermal diffusivity of 1x10-5 m / s is initially kept at 20 ° C uniform temperature . What is the temperature after 100 seconds at a depth of 5 cm , if
a ) slab surface temperature is suddenly raised to 150 ° C ,
b) slab surface is suddenly exposed to a convection source at 150 ° C with h = 40W / m .
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- 2.29 In a cylindrical fuel rod of a nuclear reactor, heat is generated internally according to the equation where = local rate of heat generation per unit volume at r = outside radius = rate of heat generation per unit volume at the centerline Calculate the temperature drop from the centerline to the surface for a 2.5-cm-diameter rod having a thermal conductivity of if the rate of heat removal from its surface is 1.6 .arrow_forward2.3 The shield of a nuclear reactor is idealized by a large 25-cm-thick flat plate having a thermal conductivity of . Radiation from the interior of the reactor penetrates the shield and there produces heat generation that decreases exponentially from a value of at the inner surface to a value of at a distance of 12.5 cm from the interior surface. If the exterior surface is kept at 38°C by forced convection, determine the temperature at the inner surface of the field. Hint: First set up the differential equation for a system in which the heat generation rate varies according to .arrow_forward2.5 Derive an expression for the temperature distribution in a plane wall in which there are uniformly distributed heat sources that vary according to the linear relation where is a constant equal to the heat generation per unit volume at the wall temperature . Both sides of the plate are maintained at and the plate thickness is 2L.arrow_forward
- A square silicon chip 7mm7mm in size and 0.5-mm thick is mounted on a plastic substrate as shown in the sketch below. The top surface of the chip is cooled by a synthetic liquid flowing over it. Electronic circuits on the bottom of the chip generate heat at a rate of 5 W that must be transferred through the chip. Estimate the steady-state temperature difference between the front and back surfaces of the chip. The thermal conductivity of silicon is 150 W/m K. Problem 1.6arrow_forwardOne end of a 0.3-m-long steel rod is connected to a wall at 204C. The other end is connected to a wall that is maintained at 93C. Air is blown across the rod so that a heat transfer coefficient of 17W/m2 K is maintained over the entire surface. If the diameter of the rod is 5 cm and the temperature of the air is 38C, what is the net rate of heat loss to the air?arrow_forward5.10 Experiments have been performed on the temperature distribution in a homogeneous long cylinder (0.1 m diameter, thermal conductivity of 0.2 W/m K) with uniform internal heat generation. By dimensional analysis, determine the relation between the steady-state temperature at the center of the cylinder , the diameter, the thermal conductivity, and the rate of heat generation. Take the temperature at the surface as your datum. What is the equation for the center temperature if the difference between center and surface temperature is when the heat generation is ?arrow_forward
- Steel pipe 1 cm thick, 1.0 m long and 8 cm deep, quiet with 4 cm thick insulation. The inner wall temperature of the steel pipe is 100 ° C. The ambient temperature around the integrated pipe is 24 ° C. The convection heat transfer coefficient outside the surface is 50 W / (m² K). The thermal conductivity of steel is 54 W / (m K), and the thermal conductivity of the insulation is 0.04 W / (m K). Count; A. Heat loss per meter of pipe = Answer watt. b. Temperature between steel pipe and insulation. = Answer ° Carrow_forward(Heat Transfer) A furnace wall is composed of 20.32cm of fireclay brick (k=1.32 W/m^2.k), 10.16cm mineral wool (k=0.039 W/m^2.k), and 10.16cm of common brick (k=0.69 W/m^2.k). The surface temperature of the common brick is 60°C and the interface temperature between the common brick and the mineral wool is 30°C. The temperature of the gases is 1000°C and the temperature of the outside air is 30°C. Determine the outside air coefficient hc=W/m^2.karrow_forwardHeat Loss by Convection and Conduction.A glass window with an area of 0.557 m2is installed in the wooden outside wall of a room. The wall dimensions are 2.44 × 3.05 m. The wood has akof 0.1505 W/m · K and is 25.4 mm thick. The glass is 3.18 mm thick and has akof 0.692. The inside room temperature is 299.9 K (26.7°C) and the outside air temperature is 266.5 K. The convection coefficienthion the inside wall of the glass and the wood is estimated as 8.5 W/m2· K; the outsideh0is also estimated as 8.5 for both surfaces. Calculate the heat loss through the wooden wall, through the glass, and the total.arrow_forward
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Principles of Heat Transfer (Activate Learning wi...Mechanical EngineeringISBN:9781305387102Author:Kreith, Frank; Manglik, Raj M.Publisher:Cengage Learning
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