K-2
K-2
Air Conditioner
7
W701-0160E
3.3 Refrigerant
1. The substance that circulates through the
refrigeration cycle, and functions to transmit heat,
is known as the refrigerant. In our air conditioning
system, HFC134a is used. It is a freon-based
refrigerant, but does not contain chlorine.
2. As shown in the figure below, the refrigerant
HFC134a remains in liquid form at relatively high
temperatures when it is strongly compressed.
However, at low pressures it vaporizes at
temperatures as low as 0°C (32°F) or
-10°C (14°F).
3. This means, for example, that if the refrigerant
vaporizes at 0°C (32°F), then the evaporator is
also at 0°C (32°F). The air that passes through
this evaporator should be cooled.
4. If the pressure is reduced so that the refrigerant
evaporates at -5°C (23°F), the evaporator is also
maintained at -5°C (23°F). This results in the
formation of frost, which inhibits the flow of air
through the evaporator and prevents cooling.
5. The vaporized refrigerant must then be liquefied.
However, it is impossible to obtain a temperature
as low as 40°C (104°F) in a hot summer
environment.
6. If 60
°
C (140°F) is possible, HFC134a will become
a liquid at 60°C (140°F) if the pressure is
approximately 1.7 MPa (246.5 psi) or above.
When the gaseous refrigerant is compressed to
1.7 MPa (246.5 psi) (by the compressor), the gas
temperature rises to approximately 80°C (176°F).
7. Therefore, the temperature of the gas as it enters
the condenser is 80°C (176°F). The curve above
shows that when the refrigerant gas is cooled by
20°C (68°F), it becomes a liquid at approximately
60°C (140°F) by the time it reaches the condenser
outlet.
Summary of Contents for TT-800XXL1
Page 20: ...B 2 B 2 Hydraulic Pump 3 W101 0280E 1 2 Inside view Variable displacement piston pump...
Page 114: ...5 G 2 G 2 Boom Five Section Boom 5 W536 0760E G 2...
Page 166: ...13 13 W701 0160E K 2 K 2 Air Conditioner K 2 4 Layout 4 1 Overall layout...
Page 167: ...14 14 W701 0160E K 2 K 2 Air Conditioner K 2 4 2 Overall layout...
Page 168: ...15 15 W701 0160E K 2 K 2 Air Conditioner K 2 4 3 Evaporator section...
Page 169: ...16 W701 0160E K 2 K 2 Air Conditioner 5 Compressor ass y...
Page 170: ...17 17 W701 0160E K 2 K 2 Air Conditioner K 2 6 Evaporator ass y...
Page 171: ...18 18 W701 0160E K 2 K 2 Air Conditioner K 2 7 Condenser ass y...
Page 172: ...19 19 W701 0160E K 2 K 2 Air Conditioner K 2 8 Electric 8 1 Electric circuit 0 363 205 60030...
Page 173: ...20 20 W701 0160E K 2 K 2 Air Conditioner K 2 8 2 Main harness A...
Page 174: ...21 21 W701 0160E K 2 K 2 Air Conditioner K 2 8 3 Main harness B...
Page 254: ...Location of Hydraulic Parts 4 WZ07 0780E 4 Z 4 Z 4 Z 4 Location of Hydraulic Parts...
Page 259: ...Hydraulic Electric Carrier Equipment Comparison Table Z 8 Z 8 Z 8 9 WZ09 0130E 9...
Page 263: ...Z 12 Z 12 Harness Boom Z 12 12 WZ04 1310E 12 Harness Boom 1 2 2 343 530 32040 1 343 530 22030...