Estimate the saturated condensing temperature (T_cond) and evaporating temperature (T_evap) of a refrigeration circuit. Three modes: (1) from coil approach — T_cond = T_ambient + condenser ΔT approach, T_evap = T_medium − evaporator ΔT approach; (2) from measured saturated pressures — given P_cond and P_evap for a known refrigerant (R-22 / R-134a / R-410A), invert the Antoine fit; (3) from subcooling & superheat — T_cond = T_liquid − SC, T_evap = T_suction − SH. Temperature in °C/K/°F; pressure in bar/MPa/kPa/PSI absolute or gauge (atmospheric default 1.01325 bar). Results reported in °C.
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Key facts
Category
Math & Numbers
Input types
select, number
Output type
json
Sample coverage
4
API ready
Yes
Overview
The Condensing / Evaporating Temperature Calculator estimates saturated condensing and evaporating temperatures for refrigeration circuits using coil approach values, measured saturated pressures, or subcooling and superheat. Enter temperatures in °C, K, or °F and pressures in bar, MPa, kPa, or PSI; results are reported in °C.
When to use
Estimate T_cond and T_evap from ambient, cooling-medium, and coil approach temperatures.
Convert measured saturated pressures into estimated saturation temperatures for R-22, R-134a, or R-410A.
Calculate temperature estimates from liquid-line temperature with subcooling and suction temperature with superheat.
How it works
1Choose one of three calculation modes: coil approach, saturated pressures, or subcooling and superheat.
2Enter the mode-specific temperatures, pressure readings, refrigerant, and measurement units.
3For gauge pressure, the calculator converts readings using the supplied atmospheric pressure; absolute pressure is used for the saturation calculation.
4The calculator returns estimated T_cond and T_evap values in °C, with configurable decimal places.
Use cases
HVAC technicians can compare estimated saturation temperatures with field temperature and pressure measurements.
Refrigeration engineers can estimate compressor temperature lift from high-side and low-side saturated pressures.
Commissioning teams can check coil approach, subcooling, and superheat calculations using consistent units.
Examples
1. Estimate temperatures from coil approach
HVAC technician
Background
A technician is reviewing a circuit with an ambient temperature of 35 °C and a cooling-load medium temperature of 12 °C.
Problem
The technician needs quick estimates of saturated condensing and evaporating temperatures using measured approach differences.
How to use
Select From coil approach, enter 35 °C for ambient temperature, 12 °C for medium temperature, 12 K for condenser approach, and 8 K for evaporator approach.