Screw compressor! By Imran

Screw compressor By Imran

How does a screw compressor work? Here we will look a bit closer at the screw air compressor technology. What is a screw compressor and what is its basic working principle? The screw element was first developed in 1930s, it has a male and female rotors, the male rotor drives the female rotor if it’s an oil injected screw compressor technology; and a timing gear drive both rotors in the oil free compressor technology as both rotors will run harmonically with minimum calculated clearance between both elements. The basic principle of a screw compressor is as the male and female rotors are rotating in opposite direction they draw air in between them. As the air progresses along the rotors the air is compressed as the volume space between the rotors decreases, hence creating compressed air that is displace to the outlet. The speed of the rotors is optimised at a certain level to minimise mechanical loses (due to heat at very high speed) and volumetric losses (air losses due to very low speed). Unlike a piston compressor a screw compressor generally doesn’t have valves and has no mechanical force that causes unbalance, this means that it can work at a high speed combined with large flow rates and still be contained within a small exterior. A good example of a screw compressor that can produce large volumes of compressed air and with a small footprint is Atlas Copco’s

Scroll Compressor! By Imran

SCROLL COMPRESSOR A scroll compressor is a specially designed compressor that works in a circular motion, as opposed to up-and-down piston action.

Scroll compressors are becoming more popular for use in HVAC systems, as they are more reliable and efficient than reciprocating types. A scroll compressor has one fixed scroll which remains stationary and another moving or orbiting scroll that rotates through the use of a swing link. When this happens, the pockets of refrigerant between the two scrolls are slowly pushed to the center of the two scrolls, causing the reduction of the volume of the gas. It is then discharged though the center port to the condenser. The advantage of a scroll compressor is that it has fewer moving parts and less torque variation compared to the reciprocating compressor. This advantage is translated to a smooth and quiet operation. The scroll compressor is also known as scroll pump or scroll vacuum pump. Scroll compressors can be applied in several different ways to meet a homeowner’s needs for efficiency, comfort, and affordability. Single-stage compressors are found in most home cooling and heating systems. The simplest and least expensive type, they operate at only one speed. Single-stage units can cool or heat a home efficiently. Two-stage compressors operate at two different speeds, more closely matching their cooling or heating output to the exact needs of the home. The ability to run at a lower, more efficient speed helps remove excess humidity from the air while saving energy and the compressor can switch to its full capacity if needed to hold temperatures steady. Two-stage systems are typically more energy-efficient than single-stage systems