Under standing Energy balance of biscuit oven is important for energy saving s in baking oven Input to the oven is the heat energy from combustion of fuel ( lpg , cng , ldo/hsd/ , electrical ) . One must evaluate the fuel options available for the factors such as
* Availability of fuel * Cost per unit * Calorific Value of the fuel * Maintenance cost on the Burners
Hence the fuel with best value ( calorific value per unit x net cost per unit ) should be sourced .
Now Oven out put in energy terms are
Heat Loss during baking of biscuit
Heat Loss during evaporation of moisture - Flour quality plays important role plus the mixing quality
Heat Loss through flue gas - Combustion generates flue gases which escapes through stacks . Heat recovery system can be installed recover this heat .Air to fuel ratio has to be checked so as to prevent excessive heating going out as flue gas .
Heat Loss through radiation - Biscuit Ovens have either duct s or Pipe s through which hat air circulates . Considerable heat are lost in these mediums . Good Insulation can be provided to minimize the loss of heat through Biscuit Oven body
Heat Loss in Band Heating - Band re heating s are now days incorporated by manufactures by providing enclosure at the bottom through which the bands returns to the feeding end .
For majority of the Baking Ovens it has been seen that it utilise' s only 40 - 50% of the Heat Input . Efforts has to be made for optimisation of heat energy