AIR CONDITIONING SYSTEM
The Air Conditioning System for the 1953
Lincoln is
essentially a Mechanical Refrigeration System
and an
Air Duct System that permits air to be withdrawn
from the passenger compartment, filtered,
cooled and
returned to the compartment for the added
comfort of
the passengers. See figure 1.
Fig. 1. Circulation of Air from Passenger
Compartment
PRINCIPLES OF REFRIGERATION
In order to handle the service problems
that may arise
in the air conditioning system, it is necessary
to
understand the basic refrigeration principles
of
mechanical refrigeration.
A refrigeration system operates on the principle
that:
2. When a vapor is compressed and cooled,
it will
condense back to a liquid
and in so doing,
give up the heat absorbed in
the evaporation
process.
To illustrate the cooling effect of a vaporizing
liquid,
drop a liquid that vaporizes easily, such
as alcohol,
ether or gasoline, on your hand. See figure
2. Your
hand is cooled because the evaporating liquid
is
removing heat.
Fig. 2. Drop a Liquid that Vaporizes Easily
on
Your Hand
1. When a liquid vaporizes, it pulls heat
from the
surrounding area. In other words it cools
the
area.
The evaporator, chilled by the evaporating
refrigerant, is the cooling unit of the
air conditioning
system.
THE
EVAPORATOR
In the refrigerating system we are studying,
we find a
similar situation in which a liquid enters
a container
where it evaporates and in so doing cools
the
container. This container is called an evaporator.
See
figure 3.
