# Condensing / Evaporating Temperature Calculator

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.

> Canonical page: https://elysiatools.com/en/tools/condensing-temperature-calculator

- **Category:** Math & Numbers

- **Keywords:** condensing temperature, evaporating temperature, saturation, refrigerant, approach, subcooling, superheat, Antoine, R-22, R-134a, R-410A, HVAC

## 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.

## Inputs

- **Refrigerant** (select): Refrigerant. Used only in 'from saturated pressures' mode.
- **Mode** (select): Estimate method: coil approach, measured saturated pressures, or subcooling/superheat.
- **Ambient / Heat-sink Temperature** (number): Heat-sink (ambient entering the condenser) temperature, in the selected Temperature Unit. Used in 'from coil approach' mode.
- **Medium / Cooling-load Temperature** (number): Cooling-load medium temperature entering the evaporator (air or water), in the selected Temperature Unit. Used in 'from coil approach' mode.
- **Condenser Approach ΔT** (number): Condenser approach ΔT = T_cond − T_ambient (K or °C). Typical air-cooled 8–15 K, water-cooled 4–7 K.
- **Evaporator Approach ΔT** (number): Evaporator approach ΔT = T_medium − T_evap (K or °C). Typical DX air 8–12 K, chilled water 4–7 K.
- **Condensing Pressure P_cond** (number): Measured condensing (high-side) saturated pressure, in the selected Pressure Unit. Used in 'from saturated pressures' mode.
- **Evaporating Pressure P_evap** (number): Measured evaporating (low-side) saturated pressure, in the selected Pressure Unit. Used in 'from saturated pressures' mode.
- **Liquid-line Temperature** (number): Liquid-line temperature after the condenser, in the selected Temperature Unit. Used in 'subcooling & superheat' mode.
- **Subcooling SC** (number): Subcooling SC (K or °C) = T_cond_sat − T_liquid. Used in 'subcooling & superheat' mode.
- **Suction Temperature** (number): Suction-gas temperature at the compressor inlet, in the selected Temperature Unit. Used in 'subcooling & superheat' mode.
- **Superheat SH** (number): Superheat SH (K or °C) = T_suction − T_evap_sat. Used in 'subcooling & superheat' mode.
- **Temperature Unit** (select)
- **Pressure Form** (select)
- **Pressure Unit** (select)
- **Atmospheric Pressure** (number): Local atmospheric pressure in bar (0.5–1.5, gauge↔absolute conversion). Default 1.01325 bar.
- **Decimal Places** (number)

## 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

- Choose one of three calculation modes: coil approach, saturated pressures, or subcooling and superheat.
- Enter the mode-specific temperatures, pressure readings, refrigerant, and measurement units.
- For gauge pressure, the calculator converts readings using the supplied atmospheric pressure; absolute pressure is used for the saturation calculation.
- The 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.

## Frequently asked questions

### Which refrigerants does the pressure mode support?

Pressure mode supports R-22, R-134a, and R-410A.

### What is the coil approach formula?

T_cond equals ambient temperature plus condenser approach ΔT, while T_evap equals medium temperature minus evaporator approach ΔT.

### Can I enter gauge pressure?

Yes. Select Gauge and provide the local atmospheric pressure, or use the default value of 1.01325 bar.

### What does the pressure mode calculate?

It uses measured condensing and evaporating saturated pressures with an inverse Antoine fit to estimate both temperatures.

### What units are supported?

Temperature inputs support °C, K, and °F. Pressure inputs support bar, MPa, kPa, and PSI in absolute or gauge form.

## Related tools

- [Absolute Value Calculator](https://elysiatools.com/en/tools/absolute-value-calculator): Calculate the absolute value of positive, negative, or decimal numbers and explain the sign relationship
- [Air Changes per Hour (ACH, n = Q/V)](https://elysiatools.com/en/tools/air-changes-per-hour): Compute the air change rate (ACH / n) of a room from the outdoor supply airflow Q and the room volume V: n = Q/V (1/h). Three modes: solve ACH (given Q and V), solve airflow (given n and V), or solve volume (given n and Q). Flow in m³/s/m³/h/CFM, volume in m³/ft³/L. Also reports the well-mixed single-zone purge time to reach a target residual fraction ε (default 1%): t = −ln(ε)/n hours.
- [Bearing Life L10 Calculator](https://elysiatools.com/en/tools/bearing-life-l10): Calculate the basic rating life of a rolling bearing: L10 = (C/P)^p, with p = 3 for ball bearings and p = 10/3 for roller bearings. When a speed is provided, converts to L10h in operating hours.
- [Bolt Torque Clamp Force Calculator](https://elysiatools.com/en/tools/bolt-torque-clamp-force): Convert between bolt tightening torque and axial clamp force. T = K·F·d, where K is the nut factor (~0.20 for dry steel). Solve torque from force, or force from torque.
- [Cable Ampacity Calculator (IEC 60364-5-52)](https://elysiatools.com/en/tools/cable-ampacity-calculator): Estimate copper cable current-carrying capacity per the simplified IEC 60364-5-52 reference method. Combines cross-section, insulation (PVC 70°C / XLPE 90°C), installation method, and ambient temperature to derive the corrected allowable ampacity (A).
- [Capacitor Reactive Power Calculator (Q_c = 2πfCU²)](https://elysiatools.com/en/tools/capacitor-reactive-power): Compute the reactive power produced by a known capacitor: Q_c = 2π·f·C·U². Supports single-phase, three-phase star (Y) and delta (Δ) connections. Returns Q_c in var/kvar, capacitive reactance Xc, and capacitor current Ic. Complementary to the power-factor-correction tool (which sizes a capacitor for a target cosφ).
- [Chain Sprocket Ratio Calculator](https://elysiatools.com/en/tools/chain-sprocket-ratio): Calculate the ratio, driven speed and chain linear speed of a chain drive. i = z₂/z₁ = n₁/n₂, chain speed v = z₁·p·n₁/60000. Enter the pitch to compute chain speed.
- [Chi-Square Test Calculator](https://elysiatools.com/en/tools/chi-square-test-calculator): Run chi-square goodness-of-fit or independence tests from observed counts or contingency tables

## Samples

- [Web Image Processing Python Samples](https://elysiatools.com/en/samples/web-image-processing-python): Web Python image processing examples using PIL/Pillow including reading, saving, resizing, and format conversion
- [Android Image Processing Java Samples](https://elysiatools.com/en/samples/android-image-processing-java): Android Java image processing examples including reading/saving images, scaling, and format conversion
- [Android Image Processing Kotlin Samples](https://elysiatools.com/en/samples/android-image-processing-kotlin): Android Kotlin image processing examples including reading/saving images, scaling, and format conversion
- [Web Image Processing Rust Samples](https://elysiatools.com/en/samples/web-image-processing-rust): Web Rust image processing examples including image read/save, scaling, and format conversion

## Related content

- [HVAC Load, Airflow, Refrigeration, and Thermal Comfort Review](https://elysiatools.com/en/hubs/hvac-load-airflow-refrigeration-comfort): Estimate HVAC loads, airflow, psychrometric states, refrigeration conditions, heat-transfer effects, and thermal comfort for an engineering review.