Question 2: Tube Still Heater Calculations The following data pertains to the radiation section of an upright, single row tube still heater: 1. Calculate the total view factor F21 between the cold plane (2) and the tubes (1) from the relation: F21=1+0.49(6R)0.09275R2+0.065(6R)3+0.0025R4 2. Determine the values, respectively, of 1,g, hir and N1. 0.00025 3- What %-age of the total heat is transferred by convection? Question 2: Tube Still Heater Calculations The following data pertains to the radiation section of an upright, single row tube still heater: 1. Calculate the total view factor F21 between the cold plane (2) and the tubes (1) from the relation: F21=1+0.49(6R)0.09275R2+0.065(6R)3+0.0025R4 2. Determine the values, respectively, of 1,g, hir and N1. 0.00025 3- What %-age of the total heat is transferred by convection