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Direct expansion (DX) air coolers
Most of them use finned tubes, as a rule, with forced air circulation. Typical ribbed-tube evaporator will have a number of parallel circuits designed for:
- maximum heat transfer;
- provide for adequate oil return;
- minimize pressure drop.
A distributor is used to ensure refrigerant flows evenly between different parallel circuits. Fig. 8 shows the evaporator distributor. Saturated refrigerant is fed through a distributor in the evaporator tubes where he weathered, before reaching the outlet. By controlling the flow of refrigerant expansion device provides the refrigerant from the evaporator overheats a bit (usually around 5K). This ensures that the cooling capacity as high as possible and at the same time protect the compressor from refrigerant liquid returning down the suction line.
Small systems with capillary tube easier evaporator. The amount of refrigerant is crucial for ensuring the effective and prevent evaporation of liquid flooding of the compressor...
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