Thermodynamics
COMPRESSION PROCESSES
COMPRESSION PROCESSES
Compression and pressurization processes are very common in many types of
industrial plants. These processes vary from being the primary function of a
piece of equipment, such as an air compressor, to an incidental result of another
process, such as filling a tank with water without first opening the valve.
EO 1.32
Apply the ideal gas laws to SOLVE for the unknown
pressure, temperature, or volume.
EO 1.33
DESCRIBE when a fluid may be considered to be
incompressible.
EO 1.34
CALCULATE the work done in constant pressure and
constant volume processes.
EO 1.35
DESCRIBE the effects of pressure changes on confined
fluids.
EO 1.36
DESCRIBE the effects of temperature changes on
confined fluids.
Boyle's and Charles' Laws
The results of certain experiments with gases at relatively low pressure led Robert Boyle to
formulate a well-known law. It states that:
the pressure of a gas expanding at constant temperature varies inversely to the
volume, or
(P1)(V1) = (P2)(V2) = (P3)(V3) = constant.
(1-40)
Charles, also as the result of experimentation, concluded that:
the pressure of a gas varies directly with temperature when the volume is held
constant, and the volume varies directly with temperature when the pressure is
held constant, or
.
(1-41)
V1
V2
T1
T2
or
P1
P2
T1
T2
Rev. 0
Page 97
HT-01
