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CSA has published a new update to its F280-12 standard (determining the required capacity of residential space heating and cooling appliances).

Below is the summary of the latest update made to the standard:

  • Ventilation sensible heat gain calculation formula is revised. The formula now uses adjusted total recovery efficiency (ATRE) of HRV/ERV instead of apparent sensible effectiveness (E) that was used previously. 
  • Default SHGC values are updated to 0.47 for all low-E double-glazed windows on Table 6F
  • Default SHGC values are updated to 0.40 for all low-E triple-glazed windows on Table 6G
  • Annex D of the standard is updated to require designers to configure a building to have largest glazed area to face southwest, if the facing direction of the building is unknown.
  • Annex E of the standard is updated to prompt designers to report SHGC for windows and skylights on the heat loss and gain calculation summary sheet.

For members who have already purchased and are applying CSA’s F280-12 standard in their work, HRAI encourages the members to review this latest update made to the standard, and apply the latest up-to-date information in their residential heat loss and heat gain calculation work going forward.

For more information contact Chang Lee, Technical   at HRAI, e-mail: clee@hrai.ca