Q4: A spherical object that is made of a material with specific heat-383 J/kg.K, and density 8954 kg/m'. The diameter of the sphere is 5-cm and it is initially at a uniform temperature of 150 C. It is suddenly exposed to an environment at 20 C having a heat-transfer coefficient h-28W/m2 C. Using the lumped-capacity method of analysis, calculate the time necessary for the sphere emperature to reach 90 C.
Q4: A spherical object that is made of a material with specific heat-383 J/kg.K, and density 8954 kg/m'. The diameter of the sphere is 5-cm and it is initially at a uniform temperature of 150 C. It is suddenly exposed to an environment at 20 C having a heat-transfer coefficient h-28W/m2 C. Using the lumped-capacity method of analysis, calculate the time necessary for the sphere emperature to reach 90 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.
Chapter3: Transient Heat Conduction
Section: Chapter Questions
Problem 3.17P: 3.17 A 1.4-kg aluminum household iron has a 500-W heating element. The surface area is . The ambient...
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Q4: A spherical object that is made of a material with specific heat=383 J/kg K , and density = 8954 kg/m’. The diameter of the sphere is 5-cm and it is initially at a uniform temperature of 150¢C. It is suddenly exposed to an environment at 20-C having a heat-transfer coefficient h=28W/m? -
![Q4: A spherical object that is made of a material with specific heat-383 J/kg.K , and density =
8954 kg/m. The diameter of the sphere is 5-cm and it is initially at a uniform temperature of
150•C. It is suddenly exposed to an environment at 20 C having a heat-transfer coefficient
h=28W/m? C. Using the lumped-capacity method of analysis, calculate the time necessary
for the sphere emperature to reach 90 C.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F9c4835c8-8551-4570-9b46-fc903bdde046%2F238f48c6-040f-4a9a-bca3-fd06fc71fab5%2Fzqckeyw_processed.jpeg&w=3840&q=75)
Transcribed Image Text:Q4: A spherical object that is made of a material with specific heat-383 J/kg.K , and density =
8954 kg/m. The diameter of the sphere is 5-cm and it is initially at a uniform temperature of
150•C. It is suddenly exposed to an environment at 20 C having a heat-transfer coefficient
h=28W/m? C. Using the lumped-capacity method of analysis, calculate the time necessary
for the sphere emperature to reach 90 C.
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