Figure 7-16.A typical shell-and-tube condenser-liquid receiver.
through the inner tube along with the exterior air
condenses (fig 7-17) the refrigerant in the outer tube.
This "double cooling" improves efficiency of the
condenser. Water enters the condenser at the point
where the refrigerant leaves the condenser. It leaves
the condenser at the point where the hot vapor from the
compressor enters the condenser. This arrangement is
called counterflow design.
The rectangular type of tube-within-a-tube
condenser uses a straight, hard copper pipe with
Figure 7-17.Tube-within-a-tube condenser designed to
The simplest method of removing scale and dirt
permit cleaning of water tubes.
from condenser tubes not accessible for mechanical
manifolds on the ends. When the manifolds are
removed, the water pipes can be cleaned mechanically.
You may be assigned to some activities where
air-conditioning system. So, the Utilitiesman will
probably have the job of cleaning the condensers.
Information that assists you in cleaning water-cooled
condensers is presented below.
Water contains many impuritiesthe content of
which varies in different localities. Lime and iron are
especially injurious; they form a hard scale on the
walls of water tubes that reduces the efficiency of the
condenser. Condensers can be cleaned mechanically
Scale on tube walls of condensers with removable
heads is removed by attaching a round steel brush to a
rod and by working it in and out of the tubes. After the
tubes have been cleaned with a brush, flush them by
running water through them. Some scale deposits are
harder to remove than others, and a steel brush may not
do the job. Several types of tube cleaners for removing
hard scale can usually be purchased from local sources.
Be sure that the type selected does not injure water