Bentley Communities
Bentley Communities
  • Site
  • User
  • Site
  • Search
  • User
  • Welcome
  • Products
  • Support
  • About
  • More
  • Cancel
Hevacomp
  • Product Communities
  • Building
  • Hevacomp
  • More
  • Cancel
Hevacomp
Hevacomp Wiki Defining air permeability
    • Sign in
    • +Hevacomp General Information
    • +Hevacomp Dynamic Simulation
    • +Hevacomp Electrical Designer
    • -Hevacomp Mechanical Designer
      • +Design Database - Hevacomp Mechanical Designer
      • +Mechanical Design - Hevacomp Mechanical Designer
      • +Netsys - Hevacomp Mechanical Designer
      • -PartL - Hevacomp Mechanical Designer
        • Actual Emission Rate (BER) displayed as zero
        • Alpha Values and Thermal Bridging
        • An important note on the PartL calculation
        • Auxiliary Energy - an explanation
        • BRUKL and ENE01 Compliance Checker differences
        • BRUKL Compliance Report Project Name
        • Calculating hot water demand
        • Cannot lodge XML - Insurer details are missing
        • Cannot select Display Lighting
        • CHP will not connect to an HWS sysytem
        • Compliance report is not generating - option is 'greyed out'
        • Consideration of shading factors
        • Considering ground floor U-values
        • Defining air permeability
        • Defining Door Types
        • Defining solar collectors
        • District heating is displayed in BRUKL report, none selected
        • Energy Consumption on BRUKL report
        • Entering non-standard HVAC systems
        • EPBD Recast - Specifying alternative forms of energy
        • EPC and Recommendations menus
        • EPCGEN Error, no compliance report and blank results
        • EPCgen.net Activation Code
        • Excessive thermal bridging
        • External doors missing from BRUKL report
        • Fuel Heating Type
        • General Lighting output in compliance report
        • Glazing area differences
        • Glazing Light Transmittance in Part L Results
        • Heating System Controls greyed out
        • Hostel room types reverting to 24x7 Bedroom after definition
        • Inputting DHW Generator Seasonal Efficiency
        • Inputting SFP for fan coils
        • Internal Surfaces appearing in PartL U-Value checks
        • Keyword out of range: Heat SSEFF error
        • Lighting results do not match input data
        • Notional Auxiliary Energy requirements increase when using HEPA filters
        • Occupancy gains may appear different
        • Omitted Recommendations shown in Recommendations Report
        • Partition Centre Lines
        • PartL 2010 and 2013 in the same project
        • Potential Measures for Scottish EPC's
        • Power Factor and Lighting Controls
        • Project data changing after loading project into different software versions
        • Renewable fuel sources
        • Result changes between 2006, 2010 and 2013 regulations
        • Room Types and the NCM Database
        • Shell and Core Building Services can cause an error
        • The BRUKL document is listing an unexpected building type
        • The NCM modelling guide
        • Thermal Bridging/PSI values
        • Usage of Biofuels
        • U-value check in Compliance Report
        • U-Value checks not carried out
        • Version 25/26 change over notes for PartL
        • Watermarks on SBEM output documents
        • XML document is not produced
        • Zone data isn't imported into PartL 2013
      • +System Builder - Hevacomp Mechanical Design
    • +Installation and activation
    • +Troubleshooting
    • +Windows tips and tricks
    • Working From Home with Hevacomp

     
     Questions about this article, topic, or product? Click here. 

    Defining air permeability

      Product(s): Hevacomp Mechanical Designer
      Version(s): V8i (N/A)
      Environment: N/A
      Area: N/A
      Subarea: N/A

    Overview

    If Criterion 2 of the Compliance report is showing a different overall air permeability figure to the one you believe you should be getting,  it may be that you have left your room definition set to 'default' rather than individual when setting up the data.

    Method

    The Room Data tab in PartL is used to set up data sets for your room. These can either be a default set for multiple room definitions, or individual sets for specific zones.

    When you visit the Room Data tab, it will always default to showing you the Default data set. This doesn't mean that any particular zones are set to use this data. This is just allowing you to view the Default data set.

    If you click into "Individual room data" and select a room, again, this doesn't mean that the room is set to the individual room data set, but is allowing you to view any individual data sets that may be defined.

    To fix a data set to a room, you should consider the "Use default" tick box. This option only becomes active when you are in "Individual room data" mode. If the "Use default" box is ticked, then the room will be set to use the Default data. If "Use default" is un-ticked, then the room will be using the individual room data that is displayed.

    The air permeability figure on the output document represent the overall average based on the floor area.

    For e.g.

    Consider 3 rooms, each with a floor area of 5m²

    Room01 and Room02 are set to use default room data with an air permeability of 10m³/(h·m²)

    Room03 uses individual room data with an air permeability of 8m³/(h·m²)

    The compliance report would show a total air permeability of 9.33m³/(h·m²)

    Buildings below 500m² of useful floor area can be exempt from a pressure test. In these instances a separate submission may be required to justify not completing a pressure test, and to confirm the air permeability used in the BER calculation is taken as 15m³/(h·m²) at 50pa.

    • Air permeability
    • SBEM
    • Hevacomp Mechanical Designer
    • PartL
    • Share
    • History
    • More
    • Cancel
    • Duncan Brown Created by Duncan Brown
    • When: Mon, Jul 11 2011 6:48 AM
    • Shane Regan Last revision by Bentley Colleague Shane Regan
    • When: Mon, Aug 24 2020 5:13 AM
    • Revisions: 11
    • Comments: 0
    Recommended
    Related
    Communities
    • Home
    • Getting Started
    • Community Central
    • Products
    • Support
    • Secure File Upload
    • Feedback
    Support and Services
    • Home
    • Product Support
    • Downloads
    • Subscription Services Portal
    Training and Learning
    • Home
    • About Bentley Institute
    • My Learning History
    • Reference Books
    Social Media
    •    LinkedIn
    •    Facebook
    •    Twitter
    •    YouTube
    •    RSS Feed
    •    Email

    © 2021 Bentley Systems, Incorporated  |  Contact Us  |  Privacy |  Terms of Use  |  Cookies