Working Principle of Expansion Devices and its Types

Expansion devises are used in between evaporator and condenser in refrigeration system. These devices meters and regulates the flow of liquid refrigerant to an evaporator. The expansion device have following specific functions.
1. To reduce the pressure of liquid refrigerant coming from condenser.
2. To maintain desired pressure difference between high pressure and low pressure side of the system.
3. Capacity expansion devices are used to maintain the desired rate of flow and pressure drop across the system.
4. To control the flow of refrigerant according to variation of load on the evaporator. Read more