Fans; design and operation of centrifugal, axial-flow, and cross-flow fans - Scanned Pdf with ocr

دانلود کتاب Fans; design and operation of centrifugal, axial-flow, and cross-flow fans - Scanned Pdf with ocr

Author: Bruno Eck

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خرید کتاب Fans; design and operation of centrifugal, axial-flow, and cross-flow fans پی دی اف

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THE continuously progressive development of fan technology made it necessary to prepare
a completely revised and enlarged version of the third edition. The technology of fan engineering
was given an unexpected impetus when the construction of high-efficiency blowers
(1952) with 90% efficiencies became practicable and the effects of this change are still far
from complete.
As far as high-efficiency blowers are concerned, the latest improvements seem to have
reached the maximum possible limits. Some new types have achieved a volumetric capacity
equal to that of axial-flow fans at efficiencies as high as over 80% although the dimensions
are remarkably small. The new performances of multi-blade blowers are noteworthy: they
are widely used in certain applications on account of their silence in operation and small
sizes. New types of application for cross-flow fans have become available and it is now possible
to explain the theory and construction of these unconventional fans to some extent.
I have created a new and comprehensive system of classifying characteristics for all types
of fan.
In the field of automatic control of centrifugal as well as axial-flow fans, progress has
been achieved.
It is, however-as previously-still very difficult to adjust fans to given operating conditions.
Many fans are wrongly selected. Investigation into this difficult problem by research
is indispensable, as otherwise it will not be possible to take advantage of the high efficiency
now obtainable with new types of fan.
In the meantime the demand for noise reduction of fans and adjacent installations becomes
more and more urgent. For certain applications these requirements are even more imperative
than high efficiencies. It became essential to improve the treatment of the subject
of fan technology by dealing with acoustic problems. Messrs. B. Regenscheit and E. GoehIich
undertook to deal with this fairly new subject; we are grateful for their contribution.
Thanks are due to Baurat Dipl.-Ing. Niermeyer, Berlin, who carefully checked this new
edition, and to the publishers Springer-Verlag for the presentation of this book, especially
for the very great number of new illustrations.

ادامه ...

Ebook details:
عنوان: Fans; design and operation of centrifugal, axial-flow, and cross-flow fans
نویسنده: Bruno Eck
ناشر: Pergamon Press; 1st English ed edition (1973)
زبان: English
شابک: 0080158722, 978-0080158723
حجم: 17 Mb
فرمت: Scanned Pdf with ocr

ادامه ...

ادامه ...
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