Expansion Valve Sizing
The Expansion Valve Sizing tool provides a highly conceptual understanding of factors influencing the selection of Thermal Expansion Valves (TXVs) or Electronic Expansion Valves (EXVs). These valves control the flow of refrigerant into the evaporator coil. This calculator considers system cooling capacity (Tons), refrigerant type, evaporator temperature, liquid line temperature, and optionally, pressure drop across the valve. It is crucial to understand that this tool is for educational and conceptual purposes ONLY and does NOT provide precise sizing needed for actual installations.
TXV vs. EXV: Thermostatic Expansion Valves (TXVs) are mechanically operated, sensing superheat via a bulb to control refrigerant flow. Electronic Expansion Valves (EXVs or EEVs) use a stepper motor and electronic controller for more precise superheat management, often improving efficiency, especially in systems with varying loads. Both types must be correctly sized for the application.
This calculator is for educational and conceptual purposes ONLY. It DOES NOT provide accurate valve sizing. Expansion valve selection is highly technical and requires specific manufacturer data, capacity tables, correction factors (for liquid temperature, pressure drop, subcooling, superheat), and consideration of valve characteristics (e.g., MOP, external/internal equalization). Incorrect valve selection can lead to severe system malfunctions, inefficiency, or equipment damage. ALWAYS use official manufacturer selection software or catalog data, and consult with qualified refrigeration professionals for actual valve sizing and selection.