Jamsher Khan Mazari 16CH Muet Jamshoro

2. Topic:
COMPRESSOR
Group Members:
JAMSHER KHAN (16CH44)
SAGAR KHAN (16CH56)

3. Contents

4. Compressor
Introduction
Classification
Applications
Advantages

5.  Compressor is used to increase the pressure of air
from low pressure to high pressure by using some
external energy.
OR
 Compressors are mechanical devices that
compress the gases.
 Compressors are considered as heart of
refrigeration system.

6. Evaporator
Compressor
Condenser
Meeting
Device

7.  Major difference is that compressors handle the
gases while pumps do the liquids.
 As gases are compressible, the compressor also
reduces the volume of gas however liquids are
relatively incompressible.

8.  For making the heat flow from refrigerant to atmosphere,
we need to increase the temperature but only increasing the
temperature would not work. Because we need the liquid
state in evaporator, such that the heat removed for
refrigeration is maximum(latent heat of vaporization is used
instead of sensible heating). So we increase the pressure
which increases the temperature, Because of increase in
pressure the boiling point increases, so the boiling point
becomes almost equivalent to room temperature and phase
change occurs in condenser. So that we get continuous liquid
at different points.
So we can say that compressor is required
for continuous cooling.

10.  A positive displacement compressor is a device
which is used to compress the fluid so that can be
transported to long distances.
HOW...???
 These compressors increase the pressure of the
fluid by decreasing its volume mechanically which
ultimately increases the speed as well as fluid
pressure.
 The compressor usually contains pistons which
enable it to function well.

13.  In this type of compressor the fluid is first
accelerated to high velocity and then passed
through a diffuser.
 The kinetic energy of fluid is converted to pressure
energy at diffuser before it leaves through the
outlet.
 Both the increase in pressure and gas flow occurs
simultaneously.

14.  The basic one-line difference between positive
displacement compressor (PDC) and dynamic
compressor (DC) lies in the fact of how they apply
the pressure on a fluid.
 In PDC a mechanical linkage reduces the volume
of fluid physically to increase the pressure
whereas in DC the fluid is provided some velocity
which undergoes a diffuser resulting in the increase
in pressure.

17.  For Generation of Electricity in Power Plants.

18.  In Aerospace,Automotive, Food and Beverages
and General Manufacturing.

19.  Glass Manufacturing, Plastics, Hospitals/Medical
Mining, PharmaceuticalsWood Products etc.

20.  For filling the air in tube of vehicles.
 In automobile service station to clean vehicles.

21.  For spray painting in paint industries.
 For cleaning workshop machines.

22.  For supercharging of IC engines
 For operation of pneumatic tools i,e. rock drills,
vibrators etc.

23.  They tend to be less expensive
 Upgrading permanent mount compressors with air
filters, water filters, and in-line lubrication is easier.
 There is a much broader selection of electrical
power options for mounted units.
 Generally, they are more powerful.
 Generally, they have greater air capacity (CFM
output).

24.  Portability and versatility.
 No additional air hose needed.