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Short notice given only substantially as follows: The Full Feature or fully integrated oil-free rotary screw compressors now offer an integrated heat recovery system to provide significant energy savings and a fast payback period. The range also features a new compact enclosure of special interest where space is a premium. Vertical textile procedures will benefit from Atlas Copco's heat recovery system using hot air recovered from the oil-free compressed air in the spinning and weaving operations to heat water for the dyeing process; ensuring a fast payback period and savings of up to Euro 230000 over a ten year period. Atlas Copco has introduced an integrated heat or energy recovery system for its new range of ZR 75-90 VSD-FF series of water cooled, oil-free rotary screw compressors suitable for a wide range of industrial applications where 100 % oil-free operation is essential. The ZR 75-90 VSD-FF models are rated at 55-90 kW (75-120 hp) and provide maximum free air deliveries of 143 l/s (8.6 m3/min)-258 l/s (15.5 m3/min) at 50/60 Hz depending on the model. The new range is also available without the VSD and FF options together with air cooled ZT series models and including The new heat recovery system has been designed to recover up to 94 % of the heat created by the air compression process is the shaft input, normally wasted in the cooler. Hot water at 85-90 deg C is recovered as a source of energy which can be used; for example, as pre-heated boiler feed water for industrial processes, space heating by radiator circulation or for showers, plus other applications such as dyeing textiles and operation of absorption chillers, etc. Further direct energy savings of up to 35% can be achieved with the VSD facility, designed to perfectly match the variations in air demand throughout the production process. The supply frequency from the frequency converter to the electric motor is set by the air demand. When demand is low, the frequency is reduced thereby slowing the motor and reducing the compressor output. When demand is high the process is reversed. The new ZR/ZT 55-90 series of oilfree compressors are housed in a new compactly designed enclosure.