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Screw Compressors - Mathematical Modelling and Performance Calculation (Paperback, Softcover reprint of hardcover 1st ed. 2005)
Loot Price: R4,948
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Screw Compressors - Mathematical Modelling and Performance Calculation (Paperback, Softcover reprint of hardcover 1st ed. 2005)
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Althoughtheprinciplesofoperationofhelicalscrewmachines,
ascompressors or expanders, have been well known for more than 100
years, it is only during the past 30 years that these machines have
become widely used. The main reasons for the long period before
they were adopted were their relatively poor e?ciency and the high
cost of manufacturing their rotors. Two main developments led to a
solution to these di?culties. The ?rst of these was the
introduction of the asymmetric rotor pro?le in 1973. This reduced
the bl- hole area, which was the main source of internal leakage by
approximately 90%, and thereby raised the thermodynamic e?ciency of
these machines, to roughly the same level as that of traditional
reciprocating compressors. The second was the introduction of
precise thread milling machine tools at - proximately the same
time. This made it possible to manufacture items of complex shape,
such as the rotors, both accurately and cheaply. From then on, as a
result of their ever improving e?ciencies, high rel- bility and
compact form, screw compressors have taken an increasing share of
the compressor market, especially in the ?elds of compressed air
production, and refrigeration and air conditioning, and today, a
substantial proportion of compressors manufactured for industry are
of this type. Despite, the now wide usage of screw compressors and
the publication of many scienti?c papers on their development, only
a handful of textbooks have been published to date, which give a
rigorous exposition of the principles of their operation and none
of these are in English
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