RevisionC-Developmentofconceptofcompressorforcommercialvehicle

1.1.2.2 Double-acting compressor: -
Double-acting compressor is a machine where the air is compressed at both ends of
piston and cylinder. Both the reciprocating air compressor can be further also classified into 3
parts.
Figure 1:5: Double-acting compressor
Reciprocating air compressor types can be also defined as: -
1.1.2.3 Reciprocating air compressor without clearance volume
1.1.2.4 Reciprocating air compressor with clearance volume
1.1.2.5 Multi-stage compressor
1.1.2.6 Oil free compressor
1.1.2.3 Reciprocating air compressor without clearance volume: -
The cycle of operation of a reciprocating air compressor is shown on a p-V diagram. It is
known as an indicator diagram for the compressor [5].
The cycle comprises of three processes
1.1.2.3.1) d-a: Induction stroke
1.1.2.3.2) a-b: Compression stroke
1.1.2.3.3) b-c: Delivery stroke
d-a: Induction stroke: -
Intake valve opens, while the exhaust valve closed. Atmospheric air is drawn into the
cylinder at constant pressure, p1 and T1. Ideally, there is no heat loss to the surrounding from
the air [5].
Page 13 of 93