Consider a thin suspended hotplate that measures 0.4 mx 0.4 m. The isothermal plate has a mass of 3.75 kg, a specific heat of 2770 J/kg-K, and a temperature of 200°C. The ambient air temperature is 25°C and the surroundings temperature is 25°C. If the convection coefficient is 6.4 W/m²-K and the emissivity of the plate is & = 0.42, determine the time rate of change of the plate temperature, dT/dt, when the plate temperature is 200°C. Evaluate the magnitude of the heat losses by convection and by radiation. dT/dt = i gradl= = i conv= i K/s W W
Consider a thin suspended hotplate that measures 0.4 mx 0.4 m. The isothermal plate has a mass of 3.75 kg, a specific heat of 2770 J/kg-K, and a temperature of 200°C. The ambient air temperature is 25°C and the surroundings temperature is 25°C. If the convection coefficient is 6.4 W/m²-K and the emissivity of the plate is & = 0.42, determine the time rate of change of the plate temperature, dT/dt, when the plate temperature is 200°C. Evaluate the magnitude of the heat losses by convection and by radiation. dT/dt = i gradl= = i conv= i K/s W W
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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![Consider a thin suspended hotplate that measures 0.4 mx 0.4 m. The isothermal plate has a mass of 3.75 kg, a specific heat of 2770
J/kg-K, and a temperature of 200°C. The ambient air temperature is 25°C and the surroundings temperature is 25°C.
If the convection coefficient is 6.4 W/m²-K and the emissivity of the plate is = 0.42, determine the time rate of change of the plate
temperature, dT/dt, when the plate temperature is 200°C. Evaluate the magnitude of the heat losses by convection and by radiation.
dT/dt = i
19radl = i
19conv
= i
K/s
W
W](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F2de2484e-8c30-4a24-aa43-7ad85b110ab5%2Fb783fe73-5c51-4ef4-869b-749f011ee8ca%2Fzdyl2iw_processed.png&w=3840&q=75)
Transcribed Image Text:Consider a thin suspended hotplate that measures 0.4 mx 0.4 m. The isothermal plate has a mass of 3.75 kg, a specific heat of 2770
J/kg-K, and a temperature of 200°C. The ambient air temperature is 25°C and the surroundings temperature is 25°C.
If the convection coefficient is 6.4 W/m²-K and the emissivity of the plate is = 0.42, determine the time rate of change of the plate
temperature, dT/dt, when the plate temperature is 200°C. Evaluate the magnitude of the heat losses by convection and by radiation.
dT/dt = i
19radl = i
19conv
= i
K/s
W
W
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