INVESTMENTS IN ENERGY SAVINGS AND HEAT RECOVERY ENERGY SAVINGS AND HEAT RECOVERY I SUSTAINABILITY Production of corrugated cardboard is a complex high tech process in which energy is used primarily in the form of heat i e steam 70 to 85 and electricity 15 to 30 From the start analysis of the status quo with regard to energy efficiency was a priority for Kunert Wellpappe It didn t take long to identify the processes that consume the most power such as air compression and steam generation so it wasn t hard to figure out which parameters could be adjusted to save power Compressed air is considered one of the most expensive forms of energy to produce and it s essential to the corrugated card board production process Air is first drawn into compressors then stored in a pressure vessel and finally fed into a circular com pressed air line The energy required when using fixed frequency compressors is very high because when a compressor without frequency regulation starts up fluctuations in the load generate spikes in its current consumption resulting in increased power costs In the process 80 to 90 of the elec trical power used is converted into heat This heat energy in the form of warm air can be put to good use during the colder seasons to heat the production halls but during the summer it simply goes to waste AIR COMPRESSION SYSTEM OVERHAUL Kunert Wellpappe has invested a considerable sum to overhaul its air compression system By the end of the year we ll be using three frequency regulated compressors connected in series and equipped with state of the art control technology The savings in electrical power afforded by these modern compressors whose frequency regulation will obviate the cost intensive load peaks promise to be considerable Pneumatic systems are often used in systems for manufacturing and processing corrugated cardboard 21

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