By Atlas Copco
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Extra resources for Compressed Air Manual, Edition: 7th
When the set time period elapses, the compressor stops and does not start again until the pressure has dropped to the minimum value. The disadvantage of this method is that it offers slow regulation. 2:45 Pressure band, Min–Max, within which the compressor operates: "Min" = load, "Max" = off-load. A further development for this traditional system is to replace the pressure switch with an analogue pressure transducer and a fast electronic regulation system. Together with the regulation system, the analogue transducer can sense how quickly the pressure in the system changes.
The off-loading power is still relatively high, representing 20% of the full load power, depending on the design of the impeller etc. 4 Speed regulation Speed regulation has a similar effect as the use of inlet guide vanes. Flow can be varied with constant pressure within the compressor turndown range. At higher powers, speed variation is less advantageous, due to the high cost of the required drive installation. 3. Controlling compressors according to these principles requires a regulation system that can be used either for an individual compressor or an entire compressor installation.
The left tower is drying the compressed air while the right tower is regenerating. After-cooling and pressure equalization the towers are automatically switched. A HOC dryer avoids compressed air loss, and the power requirement is limited to that required for rotating the drum. For example, a dryer with a capacity of 1000 l/s only consumes 120 W of electrical power. In addition, no compressed air is lost and neither oil ﬁlters nor particle ﬁlters are required. © Atlas Copco Airpower NV, Belgium, 2010 A special type of HOC dryer is the rotary drum adsorption dryer.