Tadano TT-800XXL1, Service Manual

Page: 161 / 267

K-2 K-2
Air Conditioner
8
W701-0160E
3.4 Refrigeration cycle of a car air conditioner
1. The refrigeration cycle of a car air conditioner
comprises a compressor, condenser, receiver,
expansion valve, and evaporator. The refrigerant
circulates within this cycle, with the heat in the cab
being absorbed by the evaporator and radiated
outside the vehicle by the condenser, cooling the
cab.
2. Compared with the basic refrigeration cycle
described earlier, this cycle has an expansion
valve with a different construction, and adds a
receiver.
3. To increase the cooling capacity of an air
conditioner, the largest possible amount of
refrigerant must be vaporized inside the
evaporator. The refrigerant must also be
completely vaporized when it reaches the
evaporator outlet.
3.5 Comparison with a household air conditioner
1. Larger temperature variation
The temperature in the cab is greatly influenced
by the outside air temperature. The cab
temperature is very high, especially when the
vehicle is parked under the burning sun.
This means:
The required amount of refrigerant within the cycle
varies greatly.