Buildingphysics Engineering

Airtightness Class to Air Permeability Converter (Building Physics) Calculator

Airtightness Class to Air Permeability Converter (Building Physics) engineering calculator.

Quick Answer

Calculate Airtightness Class to Air Permeability Converter (Building Physics)

Calculator

Air Permeability at 50 Pa (m³⁄(h·m²))
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Result Interpretation

Airtightness Class to Air Permeability Converter (Building Physics) Calculator computes Air Permeability at 50 Pa in m³/(h·m²) using the defined engineering formula and the input values provided.

Worked Example

Verified calculation

Given:

  • Reference Air Permeability = 3
  • Reference Class Index = 3
  • Airtightness Class = 3
  • Logarithmic Class Step Exponent = 0.5

Expected Result:

  • Air Permeability at 50 Pa = 3

Engineering Interpretation:

Under the given input conditions, the calculated result is: Air Permeability at 50 Pa = 3 m³/(h·m²).

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

Formula / Method

air permeability at 50 pa = reference air permeability * pow(10.0, (airtightness class - reference class index) * logarithmic class step exponent)

Formula family: formula_buildingphysics_airtightness_class_to_air_permeability_converter

Variables

SymbolLabelRoleDescription
airtightness_class Airtightness Class INPUT Airtightness Class
q50_ref Reference Air Permeability INPUT Reference Air Permeability
class_ref Reference Class Index INPUT Reference Class Index
class_step_exponent Logarithmic Class Step Exponent INPUT Logarithmic Class Step Exponent
air_permeability Air Permeability at 50 Pa OUTPUT Air Permeability at 50 Pa
log10_e log10_e CONSTANT log10_e = 0.43429448190325 dimensionless

Calculation Steps

  1. Enter the airtightness class in dimensionless.
  2. Enter the reference air permeability in m³/(h·m²).
  3. Enter the reference class index in dimensionless.
  4. Enter the logarithmic class step exponent in dimensionless.
  5. Step 1: Compute air permeability at 50 pa.
  6. Read the air permeability at 50 pa (m³/(h·m²)) from the results.

Engineering Summary

Calculate Airtightness Class to Air Permeability Converter (Building Physics)

Frequently Asked Questions

What does this calculator calculate?

The Airtightness Class to Air Permeability Converter (Building Physics) Calculator estimates Air Permeability at 50 Pa based on the input parameters you provide

Why is airtightness class important in this calculation?

airtightness class is directly proportional to air permeability at 50 pa. When you enter airtightness class in dimensionless, the calculator uses it in the engineering formula to compute the output

How should I interpret the result air permeability at 50 pa?

The calculator outputs air permeability at 50 pa in m³/(h·m²). 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: Airtightness Class (dimensionless), Reference Air Permeability (m³/(h·m²)), Reference Class Index (dimensionless), Logarithmic Class Step Exponent (dimensionless). 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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