2. A furnace wall is made up of three layer of thickness 250 mm, 100 mm, and 150 mm with thermal conductivity of 1.65 W/m-K, k2, and 9.2 W/m-K respectively. The inside is exposed to gases at 1250°C with a convection coefficient of 25 W/m²-K and the inside surface temperature is at 1100°C, the outside air temperature is at 30°C with convection coefficient of 12 W/m²-K. Calculate the value of T3 in °C.

2. A furnace wall is made up of three layer of thickness 250 mm, 100 mm, and 150 mm with thermal conductivity of 1.65 W/m-K, k2, and 9.2 W/m-K respectively. The inside is exposed to gases at 1250°C with a convection coefficient of 25 W/m²-K and the inside surface temperature is at 1100°C, the outside air temperature is at 30°C with convection coefficient of 12 W/m²-K. Calculate the value of T3 in °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.

Chapter2: Steady Heat Conduction

Section: Chapter Questions

Problem 2.38P: 2.38 The addition of aluminum fins has been suggested to increase the rate of heat dissipation from...

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2.38 The addition of aluminum fins has been suggested to increase the rate of heat dissipation from one side of an electronic device 1 m wide and 1 m tall. The fins are to be rectangular in cross section, 2.5 cm long and 0.25 cm thick, as shown in the figure. There are to be 100 fins per meter. The convection heat transfer coefficient, both for the wall and the fins, is estimated to be K. With this information determine the percent increase in the rate of heat transfer of the finned wall compared to the bare wall.
2.9 In a large chemical factory, hot gases at 2273 K are cooled by a liquid at 373 K with gas-side and liquid-side convection heat transfer coefficients of 50 and , respectively. The wall that separates the gas and liquid streams is composed of a 2-cm thick oxide layer on the gas side and a 4-cm thick slab of stainless steel on the liquid side. There is a contact resistance between the oxide layer and the steel of . Determine the rate of heat loss from hot gases through the composite wall to the liquid.
2. A furnace wall is made up of three layer of thickness 150 mm, 110 mm, and 125 mm with thermal conductivity of 1.65 W/m-K, k2, and 9.2 W/m-K respectively. The inside is exposed to gases at 1050°C with a convection coefficient of 25 W/m²-K and the inside surface temperature is at 900°C, the outside air temperature is at 30°C with convection coefficient of 12 W/m²-K. Calculate: a. the unknown thermal conductivity; b. the outside surface temperature and mid-plane temperatures in °F.
A furnace wall is made up of three layer of thickness 150 mm, 110 mm, and 125mm with thermal conductivity of 1.65 W/m-K, k2, and 9.2 W/m-K respectively. Theinside is exposed to gases at 1050°C with a convection coefficient of 25 W/m2-Kand the inside surface temperature is at 900°C, the outside air temperature is at30°C with convection coefficient of 12 W/m2 -K. Calculate:a. the unknown thermal conductivity;b. the outside surface temperature and mid-plane temperatures in °F.
A furnace wall is made up of three layer of thickness 200 mm, 100 mm, and 125 mm with thermal conductivity of 1.65 W/m-K, k2, and 9.2 W/m-K respectively. The inside is exposed to gases at 1200°C with a convection coefficient of 25 W/m2-K and the inside surface temperature is at 1000°C, the outside air temperature is at 30°C with convection coefficient of 12 W/m2-K. Calculate:a. the unknown thermal conductivity;
The wall of a furnace is made up of a material which has thermal conductivity of 2.65 W/m◦C and a thicknesses 300 mm. The inner side of the furnace wall is exposed to hot gases at 1200 ⁰C with a convection coefficient of 20 W/m2⁰C and the inside the surface is at 700 ⁰C. The air outside the furnace is at 20⁰C with a convection coefficient of 15 W/m2⁰C. Draw a clear diagram representing the system Determine the temperature of the outside surface of the furnace The rate of heat loss from the furnace.
A furnace wall comprises three layers of thickness 250 mm, 100 mm, and 150 mm with thermal conductivities of 1.65, k and 9. W/m K respectively. The inside is exposed to gases at 1250 ˚C with convection of 25 W/m2K, and the inside surface is at 1100 ˚C, the outside surface air at 25 ˚C with convection of 12 W/m2K. Determine the temperatures of the mid-inner surface in 0C to 1 d.p.?
A furnace wall comprises three layers of thickness 250 mm, 100 mm, and 150 mm with thermal conductivities of 1.65, k and 9. W/m K respectively. The inside is exposed to gases at 1250 °C with convection of 25 W/m2K, and the inside surface is at 1100 °C, the outside surface air at 25 'C with convection of 12 W/m K. Determine the temperatures of the mid-inner surface in °C to 1 d.p.?
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A furnace wall comprises three layers of thickness 250 mm, 100 mm, and 150 mm with thermal conductivities of 1.65, k and 9.2 W/m K respectively. The inside is exposed to gases at 1250 "C with convection of 25 W/m K, and the inside surface is at 1100 'C. the outside surface air at 25 C with convection of 12 W/m K. Which formula from figure 2 is applicable to determine the rate of heat transfer per unit area of the furnce wall considering the convective heat trafer coefficient? « K Question 32 of 84 A Moving to another question will save this response.
A cubical tank of 2 m sides is constructed of special metal plate 12 mm and contains water at 75°C. The surrounding air temperature is 16°C. Calculate the overall heat transfer coefficient from water to air. Take the coefficient of thermal conductivity of the metal as 48 W/m-K, the coefficient of heat transfer of water is 2.5 kW/m2-K and the coefficient of heat transfer of the air is 16 W/m2-K.