Category Archives for Screw Compressors

Single-Screw Compressors

The single-screw compressor was developed by a French physicist/engineer, Bernard Zimmern18, who began his work on the compressor in the early 1960s. French and U.S. patents were issued in 1964–1965. Initial sales in the U.S. were of machines compressing air, … Continue reading

01. May 2018 by Jim
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Maintenance And Service Of Screw Compressors

Many users of screw compressors hire service and contracting organizations to perform nonroutine maintenance and repairs on the machines. Major overhauls and service require the attention of specialists, but some important monitoring and service functions can be the responsibility of … Continue reading

01. May 2018 by Jim
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The Place Of The Screw Compressor In The Market

Section 4.2 in the chapter on reciprocating compressors addressed the shift in the market in the past several decades from reciprocating to screw compressors. Since these two types of compressors are virtually the only types used in industrial refrigeration, the … Continue reading

01. May 2018 by Jim
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Screw Compressor Motor Selection

Certain steps are standard when selecting an electric motor16 for a screw compressor. The motor must accommodate the design load imposed by the compressor on a continuous basis. Even a potential motor overload (when the suction pressure rises above the … Continue reading

01. May 2018 by Jim
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Screw Compressor Packages

Rather than buying a bare compressor and assembling the associated components in the field, screw compressor packages are almost universally factory-assembled. In the first place, the packager selects properly sized components for the application. Furthermore, assembly in a factory environment … Continue reading

01. May 2018 by Jim
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Screw Compressor Vibration And Noise

It is not reasonable to expect an assembly the size of a screw compressor package that converts a large rate of energy into mechanical and fluid motion to be whisper quiet. The responsibility of designing and building a quiet package … Continue reading

01. May 2018 by Jim
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The Screw Compressor As The Low Stage Compressor

When applied as a low-stage (booster) compressor, several economies can be achieved in the design of the screw compressor. A majority of low-stage compressors serve low-temperature applications in the food industry, including the freezing of food and in refrigerating spaces … Continue reading

01. May 2018 by Jim
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Economizer Circuit Using A Side Port

Examination of Figure 5.4 suggests that it would be possible to provide an opening in the housing of the compressor to tap into a cavity during compression. The refrigerant in Cavity 5, for example, is at a pressure somewhere between … Continue reading

01. May 2018 by Jim
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Oil Cooling With A Thermosyphon Heat Exchanger

The thermosyphon concept in oil cooling achieves heat transfer by boiling liquid refrigerant at the condensing pressure. Furthermore, the boiling refrigerant flows by natural convection (thermosyphon effect) through the heat exchanger. Flow diagrams of two thermosyphon systems are illustrated in … Continue reading

01. May 2018 by Jim
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Oil Cooling By Refrigerant Injection

Several decades ago the oil-cooling system using the external heat exchanger cooled by water or antifreeze lost favor compared to direct injection of refrigerant. While this concept in turn has been supplanted in many cases by the thermosyphon system, many … Continue reading

01. May 2018 by Jim
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