Air Conditioner System Flow - Kubota KX080-3 Workshop Manual

WSM KX080-3 Mechanism
b. Function and structure
(1) System flow
(1) Heat Sensitizing Tube
(2) Expansion Valve
(3) Evaporator
(4) Blower Motor
(5) Compressor
(6) Engine Cooling Fan
(7) Condenser
(8) Receiver
(9) Desiccant
(10) Pressure Switch(Dual type)
(11) Heater Core
(12) Water Valve
(a) Hot air
(b) Cab Interior Air
(c) Cab External Air
(d) Colded Air
(e)Low Press, low-temp. gas
(f)High Pressure, High Temperature Gas
(g)High Pressure, High temp. liquid
(h)Liquid refrigerant
(i)Low Pressure,
Low Temperature Liquid
The refrigerant cycle of air conditioning system is as follows.
1) The gaseous refrigerant evaporated through the evaporator (3) is compressed in the compressor (5)
to approx. 1.47Mpa (15kgf/cm
and delivered to the condenser (7).
2) The gaseous refrigerant is cooled down through the condenser (7) to approx. 50 C (122 F) and
delivered to the receiver (8) in the liquid state. At this time, heat removed from the cabin interior is
extracted by means of the condenser (7).
3) The liquid refrigerant is collected in the receiver (8) for a certain period. At this time moisture are
removed from the refrigerant by desiccant (9).
4) The liquid refrigerant after removing moisture and dust is jetted out of the small hole of the expansion
valve (2) into the evaporator (3) as if it were distributed by an atomizer. Thus, the refrigerant is
reduced in both pressure and temperature, and becomes easy to evaporate.
5) The refrigerant evaporates at 0 C (32 F) vigorously, taking heat from the surface of the pipes in the
evaporator (3).
6) At this time, warm air in a cabin is drawn into the evaporator (3) by the blower motor and is passed
over those pipes, transferring its heat to the refrigerant for evaporation. The air thus cooled is distrib-
uted to the cabin. (That is, heat in a cabin is taken by the evaporator.)
eference
Since warm air in a cabin is cooled suddenly, water in the air is liquefied and removed, which means
dehumidification is also performed.
7) The gaseous refrigerant from the evaporator (3) after having performed the cooling action is returned
to the compressor (5), and is compressed to liquefy it (high pressure and high temperature). This
cycle is repeated.
2
, 213 psi) and is also raised in temperature to approx. 70 C (158 F)
VI-M-6
VI Air Conditioner