Refrigeration and Air Conditioning
The capillary tube is not used in large capacity refrigeration systems because

Cost is too high
Capacity control is not possible
Required pressure drop cannot be achieved
It is made of copper

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Refrigeration and Air Conditioning
For proper refrigeration in a cabinet, if the temperature and vapour pressure difference between cabinet and atmosphere is high, then

Bigger cabinet should be used
Refrigerant with lower evaporation temperature should be used
Perfectly tight vapour seal should be used
Smaller cabinet should be used

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