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5.2.4 Compressed Air System
The compressed air system is not regularly checked for leaks today. If the leaks in the systems
were fixed, approximately 20% of the electricity consumption of the compressor could be
saved. [19] This amounts to 97.5 MWh/year. The electricity consumption of the compressed
air system could be further decreased if the system was sectionalised so the supply of
compressed air could be turned off for equipment not currently in operation.
5.2.5 Preheating Furnace
As the energy consumption distribution was completed, it was found that the preheating
furnace 915 was consuming almost four times as much electricity as corresponding preheating
furnaces. When the furnace was investigated it was found that a damper in the ceiling of the
furnace was open. After the damper had been closed, the electricity consumption of the
furnace was measured again. The furnace now consumes 155.8 MWh/year compared to 436.9
MWh/year before, which is a decrease of 281.1 MWh/year.
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