air comprime (ac) lecture1 pg 2-26.pdf

8/17/2019 Air comprime (AC) lecture1 pg 2-26.pdf

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ecture 1-Solid-liquid-vapour


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Volumetric flowrate

• The volumetric flow rate of a system is a measure of the volume of fluid

flowing per unit of time.

• It may be calculated as the product of the cross-sectional area of the flow

and the average flow velocity. The SI unit for volume rate of flow is m3/s.


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Compression et détente de AC


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Types of Compressor

There are two generic principles for the compression of air (or gas):

positive displacement compression and dynamic compression.


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Positive displacement

In positive displacement compression, the air is drawn into one or

more compression chambers, which are then closed from the inlet.

Gradually the volume of each chamber decreases and the air is

compressed internally. When the pressure has reached the designed

build-in pressure ratio, a port or valve is opened and the air is

discharged into the outlet system due to continued reduction of the

compression chamber’s volume.


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Etude de cas: Considérations énergétiques et pratiques

Calculer le travail qu’il faudra fournir pour comprimer en mode

isothermique et adiabatique, 1 kg d’air a une pression de 8 bar.

L’aspiration se fait a 1 bar et 150C.

air comprime (ac) lecture1 pg 2-26.pdf

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