Note: Acca f7 study text pdf 2016 attempt these mocks just 2 or 3 days before the exams. When you are completely ready for it. These are incomplete at these did’nt mention P6 mock plz share it too. Revision notes: F1, F2, F3, F4, F5, F6, F7, F8, F9, P1, P2, P3, P4, P5 and P7.
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As gases are compressible, the compressor also reduces the volume of a gas. A motor-driven six-cylinder reciprocating compressor that can operate with two, four or six cylinders. They can be either stationary or portable, can be single or multi-staged, and can be driven by electric motors or internal combustion engines. In certain applications, such as air compression, multi-stage double-acting compressors are said to be the most efficient compressors available, and are typically larger, and more costly than comparable rotary units. These are usually used for continuous operation in commercial and industrial applications and may be either stationary or portable. The classifications of rotary screw compressors vary based on stages, cooling methods, and drive types among others.
Rotary screw compressors are commercially produced in Oil Flooded, Water Flooded and Dry type. 5 times volumetric delivery of the compressor. The rotor is mounted offset in a larger housing that is either circular or a more complex shape. As the rotor turns, blades slide in and out of the slots keeping contact with the outer wall of the housing. Thus, a series of increasing and decreasing volumes is created by the rotating blades.
Rotary Vane compressors are, with piston compressors one of the oldest of compressor technologies. With suitable port connections, the devices may be either a compressor or a vacuum pump. A rotary vane compressor is well suited to electric motor drive and is significantly quieter in operation than the equivalent piston compressor. The Rolling piston in a rolling piston style compressor plays the part of a partition between the vane and the rotor. Rolling piston forces gas against a stationary vane. They operate more smoothly, quietly, and reliably than other types of compressors in the lower volume range. Often, one of the scrolls is fixed, while the other orbits eccentrically without rotating, thereby trapping and pumping or compressing pockets of fluid between the scrolls.