HVAC operative-temperature input explorer calculator

Calculate operative temperature and air–radiant difference with your own figures.

Your numbers

Use the units shown. Results update as you change valid inputs.

Use operative temperature and air–radiant difference to compare changes to your inputs. The method and limits below explain the scope.

Examples

Examples

Try the starting example

Air temperature (°C)
23
Mean radiant temperature (°C)
25
Convective heat-transfer coefficient (W/m² K)
3
Radiative heat-transfer coefficient (W/m² K)
4.7
Operative temperature (°C)
24.220779
Air–radiant difference (°C)
-2

Try another scenario

Air temperature (°C)
24
Mean radiant temperature (°C)
25
Convective heat-transfer coefficient (W/m² K)
3
Radiative heat-transfer coefficient (W/m² K)
4.7
Operative temperature (°C)
24.61039
Air–radiant difference (°C)
-1
Calculation method

Calculation method

Operative temperature (°C)

Heat-transfer-weighted operative temperature from supplied air/radiant temperatures and coefficients.

Air–radiant difference (°C)

Heat-transfer-weighted operative temperature from supplied air/radiant temperatures and coefficients.

Symbols and units
a
Air temperature (°C)
b
Mean radiant temperature (°C)
c
Convective heat-transfer coefficient (W/m² K)
d
Radiative heat-transfer coefficient (W/m² K)

Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.

Assumptions & limits

Assumptions & limits

  • Thermal-input explorer through operative temperature; not PMV/PPD, comfort certification or heat-stress assessment. Supported limits: Finite numeric values bounded to 1e9 magnitude; lists and tables contain 1–100 records unless a stricter bound is stated. Inputs use the units shown. Lists explicitly paired by a method must have matching lengths; independent polynomial coefficient vectors may differ. Respect stated physical, interpolation, policy and computational domain limits.
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Further reading

Method reference ↗

Background reading; this does not imply endorsement or independent review of SumFizz.

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