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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Air Duct System that permits air to be withdrawn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
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
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
The evaporator, chilled by the evaporating
refrigerant, is the cooling unit of the air conditioning
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.
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