Knowledge Base AutoCAD
Analyzing Buildings
Get information about the requirements analysis of a building. The demand analysis includes the calculation of the heat load, the cooling load and the ventilation concept.
Heat Load
Select a calculation basis for the calculation of the heat load according to the location and requirements of your project.
Heat Load Calculation Based on EN 12831-1 (2017)
Explains the concept of heat load calculation based on EN 12831-1 (2017).
About General Heat Load Data
Explains the concept of general heat load data in the context of heat load calculations.
Details on Specific Air Permeability (50 Pa)
Information on the Specific air permeability (50 Pa) section of the general heat load data.

New Features
Learn about new features in LINEAR software.
System Requirements
Learn more about the system requirements for using the LINEAR solutions.
Supported Norms and Standards
Learn which norms and standards support the LINEAR Solutions modules.
LINEAR Installation and Administration
Learn how to install, your LINEAR software, license and keep it up to date.
Getting Started
Get basic information about the structure, function and interaction of the LINEAR Solutions programs in AutoCAD and LINEAR Building.
Preparing and Editing Buildings and Architecture
Learn how to prepare drawings provided by an architect to create an architecture for building analysis.
Analyzing Buildings
Get information about the requirements analysis of a building. The demand analysis includes the calculation of the heat load, the cooling load and the ventilation concept.
- Heat Load
  Select a calculation basis for the calculation of the heat load according to the location and requirements of your project.
  - Heat Load Calculation Based on EN 12831-1 (2017)
    Explains the concept of heat load calculation based on EN 12831-1 (2017).
    - About Building Detection
      Explains the building detection concept in relation to the heat load calculation.
    - About General Heat Load Data
      Explains the concept of general heat load data in the context of heat load calculations.
      - Select Calculation Base
        Shows step-by-step how to select a calculation base for your heat load.
      - Select Location and Climate Data
        Shows step-by-step how to select location and climate data for your project.
      - Details on Location and Climate Data
        Information about the Location and climate data section of the general heat load data.
      - Details on Locations
        Information about the Locations dialog in the general heat load data.
      - About Location and Climate Data sets
        Explains the concept of location and climate data sets in .
      - Setting the Thermal Bridge Supplement Individually
        Shows step-by-step how to set the thermal bridge supplement at the component in the room.
      - Details on Thermal Bridge Supplement
        Information about the Thermal bridge supplement section in the general heat load data.
      - Editing Table for Thermal Bridge Supplements
        Shows step-by-step how to edit the thermal bridge supplements table.
      - Set Minimum Temperature per Building Unit
        Shows step-by-step how to set individual minimum temperatures in unheated condition for each building unit.
      - Details on Minimum Temperature Unheated Building Unit
        Information about the Minimum temperature unheated building unit section in the general heat load data.
      - Configuring the Heat Transfer System Globally and at Room Level
        Shows step-by-step how to set up a heat transfer system for rooms higher than 4 m, both project wide and room specific.
      - Details on Heat Transfer System
        Information about the Heat transfer system section in the general heat load data.
      - Set Ventilation System Globally
        Shows step-by-step how to set up a ventilation system for your entire project.
      - Set Ventilation System in Ventilation Zone
        Shows step-by-step how to define the ventilation system at the ventilation zone level.
      - Details on Ventilation
        Information about the Ventilation section in the general heat load data.
      - Details on Temperatures to Unheated Rooms
        Information on the Temperatures to unheated rooms section in the general heat load data.
      - Details on Additional Capacity
        Information on the Additional capacity section of the general heat load data.
      - Details on Shielding Class
        Information about the Shielding class section in the general heat load data.
      - Details on Building Mass
        Information about the Building mass section in the general heat load data.
      - Details on Specific Air Permeability (50 Pa)
        Information on the Specific air permeability (50 Pa) section of the general heat load data.
    - About Component Values
      Explains the concept of component values.
    - About the Transmission
      Explains the concept of transmission at room level in relation to the heat load calculation.
    - About Ventilation Data
      Explains the concept Ventilation data in relation to the heat load calculation.
    - About the Intermittent Heating Operation
      Explains the concept of intermittent heating operation at room level in connection with the heat load calculation.
  - Heat Load Calculation Based on EN 12831 (2003)
    Explains the concept of heat load calculation based on EN 12831 (2003).
  - Heat load calculation according to ISSO 51 and 53 (2018)
    Explains the concept of heat load calculation according to the Dutch standards ISSO 51 and ISSO 53 (2018).
  - Heat Load Calculation According to SN SIA 384/2 (2020)
    Explains the concept of heat load calculation based on SN SIA 384/2 (2020).
  - Heat load calculation according to DS 418(2020)
    Explains the concept of heat load calculation according to the danish standard DS 418.
  - Heat load calculation according to SP 60.13330.2016
    Explains the concept of heat load calculation based on SP 60.13330.2016.
  - Approximate Heat Load
    Explains the concept of approximate heat load calculation by means of quick entry.
- Cooling Load Short Procedure
  Learn how to calculate a cooling load for your building based on the short procedure of VDI 2078 (1996), section 6.
- Cooling Load Dynamic
  Select a method for determining the cooling load to suit the location and requirements of your project.
- Domestic Ventilation According to DIN 1946-6
  Explains the concept of the modules for domestic ventilation according to DIN 1946-6.
Dimensioning Components
Learn how radiators, convectors, panel heating/cooling systems and concrete core activation systems and components of ventilation systems are designed based on the requirement analysis in LINEAR Building.
Inserting Components
Learn how to transfer radiators or chilled beams to a LINEAR Building connected CAD platform and insert symbols and components from the libraries into CAD.
Drawing Networks
Learn how to draw pipe and duct networks, connect components, generate schemes, and create slots and openings.
Calculating Networks
Learn how to calculate pipe and duct networks.
Automatic labeling and dimension
Learn how to label components and sections in your drawing and how to dimension your drawing.
Output
Get basic information on output to the LINEAR Solutions for AutoCAD. for output to LINEAR Building and print mask editor.

Details on Specific Air Permeability (50 Pa)

Information on the Specific air permeability (50 Pa) section of the general heat load data.

You are here:

Module overview ➤ Heat load ➤ Project level ➤ General heat load data ➤ Specific air permeability (50 Pa)

Specific air permeability (50 Pa)

Click to select a category from the standard or enter a free value. This input field is deactivated as soon as the checkbox Air change n(50) measured is activated.

Air change n(50) measured

Enabled: The Specific air permeability input field is deactivated. If measured values for air change from the blower door test are available, the measured air change for 50 Pa inside-outside pressure difference can be entered here. The following measurement conditions are assumed:

Small openings were closed during the measurement
Internal volume was determined according to EN ISO 9972, method B

The value in the Specific air permeability n(50) field is calculated using this value.

Area of small openings

If corresponding measured values are available, e.g. from a blower door test, the area of small openings can be entered here. The value is taken into account when calculating the air permeability.

Name	Purpose	Lifetime	Type	Provider
CookieConsent	Saves your consent to using cookies.	1 year	HTML	Website
fe_typo_user	Assigns your browser to a session on the server.	session	HTTP	Website

Name	Purpose	Lifetime	Type	Provider
_ga	Used to distinguish users.	2 years	HTML	Google
_gat	Used to throttle request rate.	1 day	HTML	Google
_gid	Used to distinguish users.	1 day	HTML	Google
_ga_QTGLMF6700	Google Analytics cookie to throttle the request rate.	2 years	HTML	Google
_gcl_au	Used by Google AdSense to experiment with advertisement efficiency.	3 months	HTML	Google
_clck	Persists the Clarity User ID and preferences, unique to that site, on the browser. This ensures that behavior in subsequent visits to the same site will be attributed to the same user ID.	1 years	HTML	Microsoft
_clsk	Connects multiple page views by a user into a single Clarity session recording.	366 day	HTML	Microsoft
_uetsid	This is a tracking cookie used by Microsoft Bing Ads. It allows us to target a user who has visited our website before.	1 day	HTML	Microsoft
_uetvid	Used to track visitors across multiple websites to present relevant advertising based on the visitor's preferences.	390 day	HTML	Microsoft
ln_or	Registers statistical data on users’ behaviour on the website. Used for internal anyalyzes by the website operator.	1 day	HTML	LinkedIn

LINEAIR VOOR AUTODESK REVIT

LINEAIR VOOR AUTODESK AUTOCAD

Details on Specific Air Permeability (50 Pa)

Specific air permeability (50 Pa)

Air change n(50) measured

Area of small openings