Tadano TT-800XXL1, Service Manual

Page: 157 / 267

K-2 K-2
Air Conditioner
4
W701-0160E
2. Introduction to air conditioning
[NOTICE]
This section explains the fundamentals of the car
air conditioner. Difficult concepts and special
mechanisms have been omitted where possible,
and only contents which focus on the basic
functions have been included.
2.1 Principle of air conditioning
1. When alcohol is applied to your skin, it feels cool,
and when your garden is watered in the
summertime, you also feel cooler air. This is
because when alcohol or water vaporizes, it
absorbs heat (known as latent heat) from its
surroundings. As a liquid (such as alcohol and
water) changes into a vapor (such as alcohol
vapor and water vapor), it requires heat
(evaporation heat). The substance surrounding
the liquid is cooled as heat is absorbed from it.
2. This natural phenomenon explains in brief the
principle of the air conditioning that is used when
we need to lower the temperature in the cab.
3. However, if the vaporized liquid used for cooling is
simply disposed of into the air, it must be
constantly replenished with more liquid. As this is
not practical, in the actual cooling system the
vapor is cooled and returned to liquid form
(condensed).
4. To condense the vapor, it is necessary to absorb
heat from it. At this time if the vapor is
compressed to higher pressure, condensation will
take place relatively easily.
Liquid Vapor
Vaporization
Condensation
(Absorbing heat from surroundings.)
(Radiating heat of vapor outward.)
IS701‑0010E02
5. A compressor is needed to compress the vapor,
and a condenser is needed to absorb heat from it.