12 SECTION 50 - CAB HEATING AND AIR CONDITIONING
3. AIR CONDITIONING
3.1 PRINCIPALS OF AIR CONDITIONING
The function of the air conditioning system is to im-
prove the operator’s comfort by cooling the air tem-
perature inside the cab and reducing the humidity
level. In order to achieve this heat transfer the follow-
ing principals of heat generation and transfer are ap-
plied within the air conditioning system.
1. When two bodies of different temperature come
together heat is transferred from one to another.
On air conditioning systems an evaporator is
used to hold the low temperature refrigerant
which absorbs the heat from the air within the
cab.
2. When a gas is pressurized the temperature of
the gas will rise. In air conditioning systems the
increase in pressure is achieved using a com-
pressor.
3. When a gas is cooled it will condense into a liq-
uid. In the air conditioning system a condenser is
used to cool the gas and the resulting liquid is
stored in a receiver dryer.
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