# Prepared by: Berk Demirgok

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24 Οκτ 2013 (πριν από 4 χρόνια και 6 μήνες)

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Prepared by:
Berk

Demirgok

Dept. of Electrical and Computer Engineering

Utah State University

3/15/2012

References

Overview

Types of compressors

Major applications

Fluid Mechanics: Fundamentals and
Applications
By
Yunus

A.
Çengel
, John M.
Cimbala

-

McGraw
-
Hill College

(2009
)

Introduction to

Fluid Mechanics

[Book]

by
Robert W. Fox, Philip J. Pritchard, Alan T.
McDonald

Mechanical
measurements by
Thomas G.
Beckwith, Roy D.
Marangoni
, John H.
Lienhard

Wikipedia

http://www.chem.queensu.ca/people/faculty
/mombourquette/firstyrchem/GasLaws/inde
x.htm
http
://
www.electronics
-
tutorials.ws/io/io_2.html

http://www.fscc
-
online.com/%22Passing%20Gas%22
-
article/passing_gas.html
http
://www.autonics.
com/products/products_2.php?big=01&mid=
01/06

https://engineering.purdue.edu/~
propulsi/pr
opulsion/jets/basics/comp.html

http://
knowledgepublications.com/doe/doe_
mechanical_science_web_educational_textbook
_solar_hydrogen_fuel_cells.htm

Compressors increases pressure on a fluid,
gasses with compressing gasses. With
increasing pressure, volume of gasses are
reduced by compressors. However, liquids are
incompressible and cannot be used as a fluid
for compressors.

Also, note that when compressors change the
pressure of a fluid, fluid’s temperature changes

Moreover, pumps are like compressors. They
both work in the same principle. However,
pumps can only transport the fluid.

http://www.aardvarkclay.com/catalog_p
ages/compressors.html

Compressibility helps us to measure volume
change of fluids as a reaction to change in
pressure.

𝑃

𝑉
=
𝑛

𝑅

𝑇

is the relation between
volume, pressure, unity and temperature. This
equation is called ideal gas law and we can use
it as a compressibility factor equation.

Compressibility factor equation is

𝑃

𝑉
=
𝑍

𝑅

𝑇

𝑃

𝑉
=
𝑛

𝑅

𝑇

𝑃

𝑉
=
𝑍

𝑅

𝑇

P is the pressure and its unit is Pa in SI units.

V is the volume and its unit is m^3.

N is the amount of substance of a gas and its unit
is mol.

R is the universal gas constant, 0.08206
L*
atm
*
mol
^
-
1*K^
-
1.

T is the temperature and its unit is K.

Z is compression factor for gasses.

For each type of fluid or gasses, they have their
own compression factors. Next slide shows z
factors for only air.

http://
www.chem.queensu.ca/people/
faculty/mombourquette/firstyrchem/G
asLaws/images/compressibility.gif

Turbo Compressors

Axial

Centrifugal

Displacement Compressors

Reciprocating

Rotary

Screw

http://www.refrigeratortroubleshoot.com
/refrigerating
-
compressors.html

Centrifugal Compressors are also called
annular compressors.

It uses a rotating impeller rotating with really
high speed to apply force on refrigerant into a
diffuser. Diffuser section converts the velocity
energy into pressure energy.

Easy to design and fabrication

It generally rises the pressure enough for efficient
combustion with only one step without any
problems
.

Less fuel efficiency

Pressure ratio is generally lower causing creating
less thrust.

http://www.georgiapower.com/energy_k
nowhow/images/c00090.gif

Working fluid goes through out parallel the
axis of rotation. However working fluid goes
vertical for centrifugal compressors.

It creates higher flow rate and pressure so that
increases thrust and fuel efficiency.

High peak efficiency.

They large mass flow volume.

Axial compressors are hard to built and costs a lot
of money to manufacture.

They weigh much higher than centrifugal
compressors.

In order to start axial compressors, it requires high
starting power.

Typical axial Compressor is shown below.

ulsion/prop12.html

Reciprocating compressors that the volume of
fluid is reduced by a movement of a piston
inside cylinder.

Rotary compressors that the volume of fluid is
reduced by rotation of some parts without
reciprocating or piston movement.

Reciprocating and rotary compressor

http://knowledgepublications.com/doe/i
mages/DOE_Mechanical_Science_Recipro
cating_Air_Compressor.gif

http://nuclearpowertraining.tpub.com/h1
018v2/img/h1018v2_86_1.jpg

They are inexpensive.

They have very wide
-
range horsepower options.

Better mass flow rate.

Better efficiency.

Compressors are widely used in our world.
Some of the application areas are:

Medical use

Welding use

Aircrafts

Air conditioner

Pipeline transport

Rail transport

Automotive
Industry

Price range is very different for each type of
compressor. You can reduce your cost by

There are some good online stores to buy
compressors.

www.air
compressors
direct.com

www.lowes.com

www.compressor
.pronto.com

www.northerntool.com