Class NaturalVentilation

java.lang.Object
org.episteme.social.architecture.NaturalVentilation
public final class NaturalVentilation extends Object
Models passive natural ventilation and airflow in buildings. It provides calculations for the stack effect (thermal buoyancy) and wind-driven ventilation, supporting sustainable building design.
Since:
1.0
Version:
2.0
Author:
Silvere Martin-Michiellot, Gemini AI (Google DeepMind)

  • Method Summary

    Modifier and Type
    Method
    Description
    static Real
    calculateACH(double totalFlowRate, double buildingVolume)
    Estimates the Air Changes per Hour (ACH) for a building volume given a total flow rate.
    static boolean
    isCrossVentilationPossible(double buildingDepth, double windowRatio)
    Determines if Cross Ventilation is structurally possible based on building depth and window-to-wall ratios.
    static Real
    stackEffectFlow(double cd, double area, double height, double tempInside, double tempOutside)
    Calculates the Stack Effect airflow (Q) caused by thermal buoyancy.
    static Real
    windDrivenFlow(double cv, double area, double windSpeed)
    Calculates Wind-Driven ventilation flow (Q) based on pressure differences.

    Methods inherited from class Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • Method Details

    • stackEffectFlow

      public static Real stackEffectFlow(double cd, double area, double height, double tempInside, double tempOutside)
      Calculates the Stack Effect airflow (Q) caused by thermal buoyancy. Formula: Q = Cd * A * sqrt(2 * g * H * (Ti - To) / Ti)
      Parameters:
      cd - discharge coefficient (typical values around 0.65)
      area - opening area in square meters
      height - vertical distance between the neutral pressure level or openings in meters
      tempInside - average indoor temperature in Kelvin
      tempOutside - outdoor temperature in Kelvin
      Returns:
      volumetric flow rate in cubic meters per second (m3/s)

    • windDrivenFlow

      public static Real windDrivenFlow(double cv, double area, double windSpeed)
      Calculates Wind-Driven ventilation flow (Q) based on pressure differences. Formula: Q = Cv * A * v
      Parameters:
      cv - effectiveness factor (0.5-0.6 for perpendicular wind, 0.25-0.35 for diagonal)
      area - area of the opening in square meters
      windSpeed - external wind speed in meters per second (m/s)
      Returns:
      estimated volumetric flow rate (m3/s)

    • calculateACH

      public static Real calculateACH(double totalFlowRate, double buildingVolume)
      Estimates the Air Changes per Hour (ACH) for a building volume given a total flow rate. Formula: ACH = (Q * 3600) / Volume
      Parameters:
      totalFlowRate - total volumetric flow rate (m3/s)
      buildingVolume - interior volume of the building in cubic meters
      Returns:
      the number of air changes per hour

    • isCrossVentilationPossible

      public static boolean isCrossVentilationPossible(double buildingDepth, double windowRatio)
      Determines if Cross Ventilation is structurally possible based on building depth and window-to-wall ratios.
      Parameters:
      buildingDepth - distance between windward and leeward facades
      windowRatio - ratio of openable window area to facade area
      Returns:
      true if Cross Ventilation is likely feasible