A plane wall of an oven with an insulation coating is attached to an insulated wall. The thermal conductivity and thickness of the insulation coating are 0.1 W/(m K) and 1 mm, respectively. The material of the plane wall is stainless steel 304. The density, thermal conductivity, and specific heat capacity of the stainless steel 304 are 7900 kg/m³, 74.9 W/(mK), and 477 J/(kg K). respectively. The wall thickness of the stainless steel 304 is 15 mm. The temperature of the plane wall with the insulated coating is initially maintained at 30 °C. Suddenly, hot gas with a temperature of 1000 °C enters the oven. The convection heat transfer coefficient at the insulation coating surface is 70 W/(m²-K). Insulation Coating Stainless Steel 304 Oven Gas Perfectly Insulated Wall X L 3-1) What is the overall heat transfer coefficient per unit area from the gas to the surface of the stainless steel? The answer should be given in the unit of W/(m²K). 3-2) What is the value of the Biot number? 3-3) What is the time required for the inner surface of the stainless steel 304 to reach the temperature of 900 °C? The answer should be given in the unit of s 3-4) What is the temperature of the exposed surface of the insulation coating at this time? The answer should be given in the unit of "C.
A plane wall of an oven with an insulation coating is attached to an insulated wall. The thermal conductivity and thickness of the insulation coating are 0.1 W/(m K) and 1 mm, respectively. The material of the plane wall is stainless steel 304. The density, thermal conductivity, and specific heat capacity of the stainless steel 304 are 7900 kg/m³, 74.9 W/(mK), and 477 J/(kg K). respectively. The wall thickness of the stainless steel 304 is 15 mm. The temperature of the plane wall with the insulated coating is initially maintained at 30 °C. Suddenly, hot gas with a temperature of 1000 °C enters the oven. The convection heat transfer coefficient at the insulation coating surface is 70 W/(m²-K). Insulation Coating Stainless Steel 304 Oven Gas Perfectly Insulated Wall X L 3-1) What is the overall heat transfer coefficient per unit area from the gas to the surface of the stainless steel? The answer should be given in the unit of W/(m²K). 3-2) What is the value of the Biot number? 3-3) What is the time required for the inner surface of the stainless steel 304 to reach the temperature of 900 °C? The answer should be given in the unit of s 3-4) What is the temperature of the exposed surface of the insulation coating at this time? The answer should be given in the unit of "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 2.1DP
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Transcribed Image Text:A plane wall of an oven with an insulation coating is attached to an insulated wall. The thermal
conductivity and thickness of the insulation coating are 0.1 W/(m K) and 1 mm, respectively.
The material of the plane wall is stainless steel 304. The density, thermal conductivity, and
specific heat capacity of the stainless steel 304 are 7900 kg/m³, 74.9 W/(m K), and 477 J/(kg K).
respectively. The wall thickness of the stainless steel 304 is 15 mm. The temperature of the
plane wall with the insulated coating is initially maintained at 30 °C. Suddenly, hot gas with a
temperature of 1000 °C enters the oven. The convection heat transfer coefficient at the
insulation coating surface is 70 W/(m²K).
Insulation Coating
Stainless Steel 304
Oven Gas
Perfectly Insulated Wall
L
3-1) What is the overall heat transfer coefficient per unit area from the gas to the surface of the
stainless steel? The answer should be given in the unit of W/(m²K).
3-2) What is the value of the Biot number?
3-3) What is the time required for the inner surface of the stainless steel 304 to reach the
temperature of 900 "C? The answer should be given in the unit of s.
3-4) What is the temperature of the exposed surface of the insulation coating at this time? The
answer should be given in the unit of "C.
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