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Here are
some basic definitions for some of the jargon that
you'll hear when buying a vacuum system.
| Compression,
Adiabatic |
Adiabatic
Compression of a gas occurs when no heat is
transferred to or from the gas during the
compression process.
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| Compression,
Isothermal |
Isothermal
Compression is a compression where the temperature
of the gas remains constant. For perfect
gases, PV (Pressure x Volume) is constant and reversible.
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| Compression
Ratio |
The
ratio of the absolute discharge pressure to the
absolute inlet pressure.
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| Displacement |
The
volume displaced per unit of time, and in North
America is usually expressed in cubic feet per
minute.
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| Efficiency,
Compression |
The
ratio of the theoretical horsepower to the actual
horsepower required. The power imparted to
the gas is brake horsepower minus mechanical
losses.
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| Efficiency,
Isothermal |
The
ratio of work calculated on an isothermal basis to
the actual work transferred to the gas during
compression.
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| Efficiency,
Volumetric |
The
ratio of the capacity of a positive displacement
compressor to its theoretical displacement.
The difference is leakage. Does not apply to
centrifugal compressors. See
this chart to see how pressure effects volumetric
efficiency.
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| Free
Air |
Air
at atmospheric conditions at any specific
location. Atmospheric air varies according
to altitude, barometric pressure, and temperature.
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Horsepower,
Brake |
Horsepower
input to the compressor shaft.
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| Horsepower,
Indicated |
The
horsepower calculated from compressor indicator
diagrams. Does not apply to centrifugal
compressors.
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| Horsepower,
Theoretical |
The
ideal horsepower required to compress air or gas
delivered by a compressor isothermally through the
specified range of pressures. For a
multi-stage compressor with intercooling between
stages, theoretical horsepower is based on equal
work in each stage and perfect intercooling.
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| Intercooling |
The
removal of compressor heat from the air or gas
between stages or stage groups.
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Pressure,
Absolute |
The
total pressure measured from absolute
vacuum. It equals the sum of the gauge
pressure and the barometric pressure.
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Pressure,
Discharge |
Commonly
stated as gauge pressure or vacuum.
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| Standard
Air |
Defined
as air at a temperature of 68F, a pressure of
14.70 psia (absolute) and a relative humidity of
36 percent (0.0750 density). However, in the
gas industries the temperature of standard air is
usually given as 60F.
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To
get fast answers to your questions
about our industrial vacuums,
please call us toll free.
Let's Discuss it!
1 - 888 - 330 - 3365
Call toll free in the USA and Canada
Click here to e-mail your inquiry.
We'll respond to your request quickly!
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DuroVac Industrial Vacuums
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1-888-330-3365
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Contact Us
DuroVac
Industrial Vacuums
15 Iris Crescent,
Brampton, ONTARIO
L6Z 3H8
1- 888- 330- 3365
PHONE: 905-624-4003 FAX: 905-624-4641
See also:
industrial vacuums by air dynamics
Industrial Vacuums
and Cleaning Systems
IAS industrial vacuums
Mist and Dust Collectors
Commercial air filters, air purifiers & air cleaners
Central vacuum systems and industrial vacuums
DuroVacTM and PowerLiftTM are trademarks
of Northwind Air Systems
© 2003-2008 Northwind Air Systems
title: Industrial Vacuums Glossary
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