Knowledge Base Revit
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 according to DS 418(2020)
Explains the concept of heat load calculation according to the danish standard DS 418.
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 Revit and LINEAR Building.
Preparing Building
Learn how architects prepare plans and models to create a building model for building analysis.
Pre-conception design
Learn how to plan the positionining and dimensioning of technical control centers and create the route concept in collaboration with all parties involved in the planning.
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).
  - 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.
    - 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.
      - Details on Climate Data for the Denmark
        Information about the Location and climate data section of the general heat load data.
      - Editing Table for Thermal Bridge Supplements
        Shows step-by-step how to edit the thermal bridge supplements table.
      - 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 Shielding Class
        Information about the Shielding class 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.
  - 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 insert components from the LINEAR CAD Browser, from the libraries and configurators of the Library tab or from LINEAR Building into a model.
Constructing Networks
Learn how to create pipe and duct networks, design slots and openings and manage discipline-related reports and tasks.
Calculating Networks
Learn how to calculate pipe and duct networks.
Creating a Scheme
Get information on the workflow Scheme for the discipline Potable Water in Revit.
Construction Design
Get information about the workflow Construction design in connection with pipe and duct networks.
Labeling
Learn how to label section parts and components in the model.
Output
Obtain information on the output of calculation results and material extracts in your CAD program in LINEAR Building. In addition, find out how you can customize the layout of the output documents using the print mask editor.
Troubleshooting
Get information about possible sources of errors when working with LINEAR Solutions.

Details on Specific Air Permeability (50 Pa)

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

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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.

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Details on Specific Air Permeability (50 Pa)

Specific air permeability (50 Pa)

Air change n(50) measured