Space is considered a perfect black body with T= - 70 celsius Air Does not absorb heat radiation from the water in the bowl. Air temperature is considered constant TAir = 15 celsius Heat transfer coefficient from water to air: hc = 2.6 W/(m2∙celsius) cabbage with water Depth to the water in the bowl: H = 0.020 m Base area to water layer: A= 0.020 m2 Starting temperature: T0 = 15 celsius Emissivity to water: = 0.98 a) Calculate heat transport by radiation from the water in the bowl to space at initial conditions. b) Calculate net heat transport from the water in the bowl at water temperature T= 0 celsius (beginning of freezing).
Space is considered a perfect black body with T= - 70 celsius Air Does not absorb heat radiation from the water in the bowl. Air temperature is considered constant TAir = 15 celsius Heat transfer coefficient from water to air: hc = 2.6 W/(m2∙celsius) cabbage with water Depth to the water in the bowl: H = 0.020 m Base area to water layer: A= 0.020 m2 Starting temperature: T0 = 15 celsius Emissivity to water: = 0.98 a) Calculate heat transport by radiation from the water in the bowl to space at initial conditions. b) Calculate net heat transport from the water in the bowl at water temperature T= 0 celsius (beginning of freezing).
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.
Chapter11: Heat Transfer By Radiation
Section: Chapter Questions
Problem 11.66P
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Space is considered a perfect black body with T= - 70 celsius
Air
Does not absorb heat radiation from the water in the bowl.
Air temperature is considered constant TAir = 15 celsius
Heat transfer coefficient from water to air: hc = 2.6 W/(m2∙celsius)
cabbage with water
Depth to the water in the bowl: H = 0.020 m
Base area to water layer: A= 0.020 m2
Starting temperature: T0 = 15 celsius
Emissivity to water: = 0.98
a) Calculate heat transport by radiation from the water in the bowl to space at initial conditions.
b) Calculate net heat transport from the water in the bowl at water temperature T= 0 celsius (beginning of freezing).
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Step 1: Determine heat transport by radiation from the water and heat transport from the water in the bowl.
VIEWStep 2: Calculate heat transport by radiation from the water in the bowl to space at initial conditions.
VIEWStep 3: Calculate net heat transport from the water in the bowl at water temperature T= 0 C.
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