Dual Air-Conditioning

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Dual air-conditioning

This system (Figs 1.71 and 1.72) often combines the use of a fixed orifice valve and an expansion valve. The primary operation of the system shown in Figure 1.71 is a fixed orifice system with additional outlets and inlets which feed an additional expansion valve and evaporator to aid additional cooling. The additional cooling is often fitted in the back of a large multipassenger vehicle given two temperature control zones – front zone and rear zone. The outlet (8) from the primary system to the additional expansion valve/evaporator is fed from the inlet (7) to the fixed orifice valve. Refrigerant splits and flows from the outlet of the primary system to an expansion valve and evaporator. Their function is identical to the normal expansion valve system. Refrigerant vapour flows from the evaporator in the secondary system to the accumulator (4) then (3) in the primary system.The accumulator ensures that hot liquid refrigerant enters the compressor from both systems.

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