Heat Balance
Complete heat balance of a furnace shows the flow of heat in a furnace. Heat balance contains the information regarding the sources of heat input like sensible heat of reactants, calorific value of fuel, heat of exothermic reactions etc. Heat balance also shows the heat output like wall losses, sensible heat in POC, opening losses, heat carried by the charge etc.

We have to differentiate between the quantities of heat directly related to combustion from the quantities of heat that relate to the process in order to control combustion or to study the factors affecting the fuel utilization. Sensible heats of air and fuel and amount of air relate to the quantities affecting combustion, whereas heat carried by the charge relate to the process, that is if it is required to heat the material at 900^oC, the heat carried-away by the charge would be corresponding to 900^oC.Losses could also be considered as the parameters relating to the process.