Water is king at AQUAAIR
The economy of a screw compressor is heavily dependent on the electricity and maintenance costs. – These together make up about 80 % of the total compressed air costs:
A screw air end, the heart of a screw compressor and the component in which the actual compression of the ambient air takes place, works according to the continuous displacement principle. – Following the gas equation for a closed system (p0 x V0 / T0 = p1 x V1 / T1 = R = constant), an isothermal (T1 isotherm: = T0) compression of the ambient air is the physical optimum. – The lower the difference between the compression and ambient temperature, the better the energy efficiency and thus the specific electricity costs of a screw compressor.
Since the compression temperature of dry-running screw compressors increases up to 240 °C, oil or water is injected into the air end primarily for cooling but also for lubrication and sealing. In this case, the compression temperature of an oil-injected air end rises to up to 100 °C, whereas in the case of a water-injected air end of AQUAAIR it only increases by 10 °C above ambient temperature.
The AQUAAIR screw air end is therefore the most energy-efficient with almost isothermal compression, and the compressed air generated is absolutely oil-free.
The compressed air generated by an oil-injected screw air end is also oil-contaminated and must be subjected to oil filtration, which further significantly deteriorates the overall energy efficiency of an oil-injected screw compressor with the attendant partial pressure drop. – The cost of electricity and filter inserts increase exponentially with the desired degree of purity of the compressed air.
A water-injected AQUAAIR screw compressor gets the water directly from the air for cooling and lubrication. An external water connection and an energy and maintenance-intensive water treatment are not necessary.
The overall energy efficiency of AQUAAIR screw technology is leading with the highly efficient AQUAAIR screw air end without the need for expensive oil filtration and water treatment, the specific electricity cost of compressed air produced is unbeatably low.
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Oil-free, water-injected screw compressors with powerful control
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