Q. A hot pipe having surface temperature 245'c is placed in large enclosure. The enclosure walle Can be aulomed ar are 9

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Q A Hot Pipe Having Surface Temperature 245 C Is Placed In Large Enclosure The Enclosure Walle Can Be Aulomed Ar Are 9 1 (107.54 KiB) Viewed 11 times

Q. A hot pipe having surface temperature 245'c is placed in large enclosure. The enclosure walle Can be aulomed ar are 98°c. The pipe surface black. The total heat transfer coefficat and radiation) is including (convection 37 w/m.k. It the Stefan-Boltzmam constant is 5-67x108 w/ork". Calculate the heat transfer heat transfer and convective radiant Q. Two large parallel plates at T₁-800 K and T₂-600 K have emissivities &₁ = 0.5 and 2 = 0.8, respectively. A radiation shield having an emissivity 83,1 = 0.1 on one side and an emissivity 83,2 = 0.05 on the other side is placed between the plates. Calculate the heat transfer rate by radiation per square meter with and without the radiation shield. Q. Calculate the heat dissipated by radiation through a 0.2 m² opening of a furnace at 1100 K into an ambient air at 300 K. Assume both the furnace and the ambient are black bodies. Q. Calculate the net radiant energy interchanged per square meter for two very large planes at temperatures of 1000°C and 250°C respectively. Assume the emissivities of hot and cold planes are 0.9 and 0.7 respectively.