When providing a calculation of process energy requirement (PER) or energy requirement for firing (ERF), the correct energy carriers shall be taken into account for the entire plant or for the firing stage only. Gross calorific values (high heat value) of fuels shall be used to convert energy units to MJ (Table A1). In case of use of other fuels, the calorific value used for the calculation shall be mentioned. Electricity means net imported electricity coming from the grid and internal generation of electricity measured as electric power.
Evaluation of PER for agglomerated stone production shall consider all energy flows entering the production plant both as fuels and electricity.
Evaluation of PER for terrazzo tiles production must consider all energy flows entering the production plant both as fuels and electricity.
Evaluation of ERF for ceramic tile production shall consider all energy flows entering all the kilns as fuels for the firing stage.
Evaluation of ERF for clay tile production shall consider all energy flows entering all the kilns as fuels for the firing stage.
Evaluation of PER for cement production shall consider all energy flows entering the production system both as fuels and electricity.
Table for calculation of PER or ERF (see text for explanations)
| Production period | Days | From | To | |
|---|---|---|---|---|
| Production (kg) | ||||
| Fuel | Quantity | Units | Conversion factor | Energy (MJ) |
| Natural gas | kg | 54,1 | ||
| Natural gas | Nm3 | 38,8 | ||
| Butane | kg | 49,3 | ||
| Kerosene | kg | 46,5 | ||
| Gasoline | kg | 52,7 | ||
| Diesel | kg | 44,6 | ||
| Gas oil | kg | 45,2 | ||
| Heavy fuel oil | kg | 42,7 | ||
| Dry steam coal | kg | 30,6 | ||
| Anthracite | kg | 29,7 | ||
| Charcoal | kg | 33,7 | ||
| Industrial coke | kg | 27,9 | ||
| Electricity (from net) | kWh | 3,6 | ||
| Total energy | ||||
| Specific energy consumption (MJ/kg of product) | ||||