it’s heat transfer class.. quick answer and clear steps please 3. For a four-surface system, all surfaces are diffuse and gray. All surfaces have the same size of square 2 m2 and the emissivities...
4.16 Two large diffuse gray parallel plates, separated by a small distance, have surface temperature of 400 K and 300 K. IF the emissivities of the surfaces are 0.8 and the Stefan-Boltzmann constant is 5.67 x 10-8 W/m3K4, the net radiation heat exchange rate in kW/m2 between the two plates is (a) 0.66 (c) 0.99 (b) 0.79 (d) 3.96
3. Two gray-diffuse spheres have properties and temperatures shown below. R and R2 are 0.1 m and 0.3 m respectively. (i) Compute heat transfer rate of sphere 1, q W]. Also, to minimize the heat loss, you decide to put a radiation shield in between the two spheres. (ii) Where do you prefer to place the radiation shield, i.e., close to sphere 1 or sphere 2 or right in the middle? (iii Somehow you place the radiation shield with R3...
T, = 700K E 0.8 RI T, =900K 2 R2 E20.5 3. Two gray-diffuse spheres have properties and temperatures shown below. R and R2 are 0.1 m and 0.3 m respectively. (i) Compute heat transfer rate of sphere 1, q W]. Also, to minimize the heat loss, you decide to put a radiation shield in between the two spheres. (ii) Where do you prefer to place the radiation shield, i.e., close to sphere 1 or sphere 2 or right in...
Heat transfer Please answer quick with clear work Thank you 2. For a flat blackbody surface, there is a fluid flowing in parallel with h 25W/m2K and T-300K. When the surface reaches to thermal equilibrium (hint: gcom Grad), what is the temperature of the surface? If the temperature of the surface reaches to 400K, what is the ratio of the radiation heat flux and convection heat flux for this blackbody surface? (25 PTS)
Homework 7 heat transfer 2018-20 1) A horizontal tube of 12.5-mm dimeter with an outer srface temperature of 240°C is placed in a room with an air temperature of 20°C. Estimate the heat transfer rate per unit length of the tube due to free convection. 2) Air at -10°C flows at 10 m/s over the roof plate of two 5m length rooms whose air is at Too-200C. The roof plate is 0.20-m thick concrete (k = 0.6 w/ m. K)....