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Calculator

Enclosure Thermal Calculator

Enter your enclosure dimensions, material, installation conditions, and heat load to calculate the required heating and cooling capacity per IEC 60890.

Temperature unit

Enclosure dimensions & material

External dimensions

mm

External height of the enclosure in millimetres

mm
mm

Enclosure wall material sets the thermal conductivity coefficient automatically.

W/m²K

Thermal conductivity coefficient k in W/(m²·K). Auto-filled for preset materials; editable for custom.

Installation conditions

Environment

Indoor = standard convection factor (1×). Outdoor = increased heat exchange due to wind and solar gain (2×).

Higher altitudes reduce air density, increasing the required airflow for cooling.

Heat load & temperature limits

W

Total heat output of all components inside the enclosure — drives, contactors, transformers, resistors, and similar devices.

Heating — winter / cold site

°C
°C

Cooling — summer / hot site

°C
°C

Results

Required heating capacity Heater output to maintain minimum internal temperature
Required cooling capacity Active cooling to maintain maximum internal temperature
Calculation breakdown
Effective surface area
Air constant
ΔT heating
ΔT cooling
Wall transfer — heating
Wall transfer — cooling
Net cooling load
Heating from temperature

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How it’s calculated

Wall heat transfer
Q = k × ΔT × A × f

Cooling load
Q_cool = P_diss − Q_walls

Active cooling capacity
Q_air = (Q_cool / ΔT) × C_air

f = 1 (indoor) or 2 (outdoor). C_air is the altitude-adjusted air constant. Effective area A depends on which faces are exposed. Based on IEC 60890.

Next step

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