Wet air enters into the dryer and passes through the heat exchanger. The warm wet air entering the dryer is cooled down by the outgoing cold and dried air which reduces load on the refrigerant compressor, saving energy costs. Next the compressed air passes through the air to refrigerant heat exchanger which cools the air temperature to the pre-set dewpoint. This is set at +2C, water in the air at this stage condenses and turns into water droplets. This condensate is removed automatically by the auto drain as bulk water. (This should then pass into a oil/water separator before going to drain). Finally, the cool and dry air is reheated by thermally mixing it with the incoming air which also reduces its relative humidity (water-loading), thus preventing pipework corrosion and annoying condensation on downstream pipework. Dryers from 21cfm up to 5297cfm available on a short lead-time, the standard range is available ex-stock for next day delivery.
The option of discharging to the foul drain (sewer) system is controlled locally, and the authorities do not usually allow discharges containing more than 20ppm of oil to be introduced to the drains. Just 250ml of oil can cover acres of water surface, preventing oxygenation; reducing the effectiveness of treatment plants and killing and other wildlife A compressor of only 18kW can generate close to ten thousand litres of condensate each year, often containing up to 1000ppm of oil and other waste at the point of discharge. It makes sense to treat this on site because the 99.9% of condensate that is water can be legally discharged to the sewer, while the disposal of a few litres of captured oil is easy and afford-able. SEPURA offers the most economical, simple and reliable method of complying with the legal requirements - letting you do your bit for the planet without breaking the bank.