A classical lehr for a 600TPD float glass line may consume about 10 kWh/T electricity or 25 kWh/T primary energy. A typical float glass line consumes about 7500 MJ/T of primary energy. As a consequence, a float glass lehr contributes to only 0.33% of energy used to produce float glass. But, when the price of electricity is 0.1?/kWh, a 600TPD lehr consumes in one campaign of 17 years ?3.7 million of electricity, which is of the order of the investment in the lehr. In the following, the energy consumption of the float lehr in the different parts of the temperature curve is explained.
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