Buildingphysics Engineering

Daylight Factor Distribution Mapper for Façade Zones calculator

Daylight Factor Distribution Mapper for Façade Zones engineering calculator.

Runnable This tool can run, but independent engineering verification has not been established.

Quick Answer

The daylight factor distribution mapper for façade zones calculator computes daylight factor distribution value from the input values you provide.

Calculator

Daylight factor distribution value (dimensionless)
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Result Interpretation

Daylight Factor Distribution Mapper for Façade Zones calculator computes Daylight factor distribution value in dimensionless using the defined engineering formula and the input values provided. Daylight factor distribution value is expressed in dimensionless. No universal acceptance threshold is defined by this calculator.

Worked Example

Verified calculation

Given:

  • Visible transmittance of glazing = 0.65
  • Window area = 12
  • Angle of incidence between sky dome centroid vector and façade normal = 0.785398
  • Façade zone projected area (vertical projection) = 15

Expected Result:

  • Daylight factor distribution value = 23.570229890866

Engineering Interpretation:

Under the given input conditions, the calculated result is: Daylight factor distribution value = 23.570229890866 dimensionless.

The actual numerical result is computed by the Runtime engine using the persisted tool definition. The values shown here come from deterministically validated test cases.

Formula / Method

daylight factor distribution value = (0.5 * visible transmittance of glazing * window area * cos(angle of incidence between sky dome centroid vector and façade normal)) / (vertical projection * 0.0078)

Daylight factor distribution value.

Variables

SymbolLabelRoleDescription
T_vis Visible transmittance of glazing INPUT Visible transmittance of glazing
A_win Window area INPUT Window area
theta_inc Angle of incidence between sky dome centroid vector and façade normal INPUT Angle of incidence between sky dome centroid vector and façade normal
A_zone Façade zone projected area (vertical projection) INPUT Façade zone projected area (vertical projection)
result Daylight factor distribution value OUTPUT Daylight factor distribution value

Calculation Steps

  1. Enter the visible transmittance of glazing in dimensionless.
  2. Enter the window area in m².
  3. Enter the angle of incidence between sky dome centroid vector and façade normal in rad.
  4. Enter the façade zone projected area (vertical projection) in m².
  5. Step 1: Compute daylight factor distribution value.
  6. Read the daylight factor distribution value (dimensionless) from the results.

Frequently Asked Questions

What does this calculator calculate?

The Daylight Factor Distribution Mapper for Façade Zones calculator estimates Daylight factor distribution value based on the input parameters you provide

Why is visible transmittance of glazing important in this calculation?

visible transmittance of glazing is directly proportional to daylight factor distribution value. When you enter visible transmittance of glazing in dimensionless, the calculator uses it in the engineering formula to compute the output

How should I interpret the result daylight factor distribution value?

The calculator outputs daylight factor distribution value in dimensionless. The result is computed directly from the input values using the defined engineering formula

What units should I use for the inputs?

Enter each value in the units shown next to the input field: Visible transmittance of glazing (dimensionless), Window area (m²), Angle of incidence between sky dome centroid vector and façade normal (rad), Façade zone projected area (vertical projection) (m²). Make sure all inputs use the specified units for consistent results

What assumptions does this calculator use?

This calculator uses automatically validated engineering formulas. Results are approximate and should be validated against site-specific conditions, applicable codes, and professional engineering judgment

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