Refrigeration & Air Conditioning Technology, 8e - 50

50

Section 1 Theory of Heat

Figure 3.24 The suction line connects the outlet of the evaporator to
the inlet of the compressor.
COMPRESSOR

SUCTION LINE

compressors in refrigeration systems perform this function
by compressing the vapor refrigerant, which can be accomplished in several ways with different types of compressors.
The most common compressors used in residential and
light commercial air-conditioning and refrigeration are the
reciprocating, the rotary, and the scroll.
The reciprocating compressor uses a piston in a cylinder
to compress the refrigerant, Figure 3.26. Valves, usually reed
or flapper valves, ensure that the refrigerant flows in the correct direction, Figure 3.27. This type of compressor, known
as a positive displacement compressor, increases the pressure
of the refrigerant by physically decreasing the volume of the
Figure 3.26 The crankshaft converts the circular, rotating motion of the
motor to the reciprocating, or back-and-forth, motion of the piston.

EVAPORATOR
DIRECTION OF
REFRIGERANT FLOW

Courtesy Ferris State University. Photo by John Tomczyk

Figure 3.25 Suction lines should be well insulated to increase system
efficiency and capacity and to prevent sweating.

refrigerant line. Heat from the surrounding air can, therefore,
be readily absorbed into the refrigeration system, making the
system work much harder than needed. For this reason, the
suction line is insulated, Figure 3.25. A well-insulated suction
line helps the system operate as efficiently as possible and the
insulation prevents the suction line from reaching the dew
point temperature and sweating.

3.8 THE COMPRESSOR
The compressor is the heart of the refrigeration system. It
pumps heat through the system in the form of heat-laden
refrigerant. A compressor can be considered a vapor pump.
It reduces the pressure on the low-pressure side of the system, which includes the evaporator, and increases the
pressure on the high-pressure side of the system. This pressure difference is what causes the refrigerant to flow. All

UP AND
DOWN

PISTONRECIPROCATING
MOTION
CRANKSHAFT-
CIRCULAR MOTION

Figure 3.27 Flapper valves and compressor components.
DISCHARGE
FLAPPER VALVE

REFRIGERANT GAS
RUSHING OUT OF THE
PORT WHEN
VALVE PO
PISTON IS RISING
THE PIST
CYLINDER
IN THE CY

TOP OF
PISTON

DETAIL

OUT

IN
N

DISCHARGE
D
FLAPPER VALVE
F

SUCTION
ON
FLAPPER
ER
VALVE

PISTON
DURING
UPSTROKE

OIL
OIL
OI



Refrigeration & Air Conditioning Technology, 8e

Table of Contents for the Digital Edition of Refrigeration & Air Conditioning Technology, 8e

Contents
Refrigeration & Air Conditioning Technology, 8e - Cover1
Refrigeration & Air Conditioning Technology, 8e - Cover2
Refrigeration & Air Conditioning Technology, 8e - i
Refrigeration & Air Conditioning Technology, 8e - ii
Refrigeration & Air Conditioning Technology, 8e - iii
Refrigeration & Air Conditioning Technology, 8e - Contents
Refrigeration & Air Conditioning Technology, 8e - v
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