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Incident Solar Irradiation — Watt/m²

Compute incident solar irradiation in W/m² on any surface for energy calculations, solar panel placement, and facade thermal analysis.

ASHRAE 140-2011 Irradiation
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Watt per m² calculation on a virtual surface
Solar & Outdoor

Solar irradiation on any surface

The Watt module computes incident solar irradiation (W/m²) on any surface, using EPW climate data, geometry, and material reflectance. Virtual sensors can be placed anywhere in or around the model to measure irradiation at any height.

Results feed energy calculations, inform solar panel placement, support thermal load studies, and help optimise shading devices. The module is validated against ASHRAE 140-2011.

  • Irradiation on real or virtual surfaces, any orientation
  • Period-based or annual calculations
  • Virtual sensor placement at custom heights
  • Feeds energy simulation and solar panel sizing
  • Validated against ASHRAE 140-2011
Custom sensor placement

Custom sensor placement

Initial irradiation setup

Initial irradiation setup

Frequently asked questions

What is this metric?

To be developed.

How does DL-Light compute it?

To be developed.

What thresholds or standards apply?

To be developed.

Going further

Read the full DL-Light user-guide reference for Incident Solar Irradiation — Watt/m²: Windows guide · macOS guide.

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