The expansion device is designed to promote a sudden
refrigerant pressure and facilitate evaporation. The refrigerant arrives at the expansion device in liquid form at high pressure and ambient temperature and after passing through the device restriction, expands and leaves as a saturated mixture at low pressure.
The expansion device regulates the amount of liquid present in the evaporator.
Two types of expansion devices are used in the residential line:
- the capillary tube, with capacity up to 22K Btu / h;
- Expander orifice used in higher capacity equipment
