would you help me with the combustion of the pellet burner in heat exchanger boiler. The problem is i dont know how many percent of the flame is radiation and how many is with convection properties. I have made some calculation, but only with convection in the air and there is some differences from the real object, because i think the reason is in radiation absence. Maybe, some percent from the 100kW fire of the burner mast be in radiation transfer to the walls of the boiler. In the real boiler, the exhaust gases are lower than the virtual boiler.