An opaque surface which is insulated at the back side has a total, hemispherical absorptivity a=0.8 for solar radiation and a total, hemispherical emissivity of e=0.2. A solar radiation flux of 800 W/m2 is incident on this surface. The surface is exposed to the ambient air at T = 300 K and convective heat transfer coefficient is h=15 W/m2 K. Neglect the sky radiation. • Sketch the heat fluxes received and dissipated by this surface • Estimate the equilibrium temperature of the surface (assume the surface temperature is higher than the ambient air temperature). T.= 300 K, h-15 W/m'K 800 w/m a-0.8, e-0.2
An opaque surface which is insulated at the back side has a total, hemispherical absorptivity a=0.8 for solar radiation and a total, hemispherical emissivity of e=0.2. A solar radiation flux of 800 W/m2 is incident on this surface. The surface is exposed to the ambient air at T = 300 K and convective heat transfer coefficient is h=15 W/m2 K. Neglect the sky radiation. • Sketch the heat fluxes received and dissipated by this surface • Estimate the equilibrium temperature of the surface (assume the surface temperature is higher than the ambient air temperature). T.= 300 K, h-15 W/m'K 800 w/m a-0.8, e-0.2
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![An opaque surface which is insulated at the back side has a total, hemispherical
absorptivity a=0.8 for solar radiation and a total, hemispherical emissivity of e=0.2. A solar
radiation flux of 800 W/m2 is incident on this surface. The surface is exposed to the ambient air at T
300 K and convective heat transfer coefficient is h=15 W/m2 K. Neglect the sky radiation.
• Sketch the heat fluxes received and dissipated by this surface
• Estimate the equilibrium temperature of the surface (assume the surface temperature is higher
than the ambient air temperature).
1.= 300 K, h-15 W/m*K
800 W/m?
a-0.8 , e-0.2](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F6e9db50a-4d56-435a-a058-414853800bca%2F7da497ea-f0fa-46fd-8a0e-ea7f230c524f%2Fbukmysb_processed.jpeg&w=3840&q=75)
Transcribed Image Text:An opaque surface which is insulated at the back side has a total, hemispherical
absorptivity a=0.8 for solar radiation and a total, hemispherical emissivity of e=0.2. A solar
radiation flux of 800 W/m2 is incident on this surface. The surface is exposed to the ambient air at T
300 K and convective heat transfer coefficient is h=15 W/m2 K. Neglect the sky radiation.
• Sketch the heat fluxes received and dissipated by this surface
• Estimate the equilibrium temperature of the surface (assume the surface temperature is higher
than the ambient air temperature).
1.= 300 K, h-15 W/m*K
800 W/m?
a-0.8 , e-0.2
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