LEED MURB Canada Issues

Alex Wong

LEEDuser Basic Member

14 thumbs up

May 10, 2010

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Alex Wong

LEEDuser Basic Member

14 thumbs up

Mon, 05/10/2010 - 21:27

Sorry i forgot to add that the HRV will only supply approx 70% of the required O/A. The rest of the portion is by fresh air duct to the heat pump and/or openable windows. Is this too complicated? Can we pass with just openable windows and make-up from the corridor?

Roger Chang

Principal, Energy and Engineering Leader

DLR Group | Westlake Reed Leskosky

LEEDuser Expert

267 thumbs up

Wed, 05/12/2010 - 20:36

Alex, I have some experience using transfer air to meet 62.1 requirements. You have to look carefully at the classification of air (1, 2, 3, 4). 62.1 allows you to transfer air, as long as classification of air stays the same or goes from lower to higher (cleaner to dirtier). You may be able to use the OA from the HRV to ventilate the 20% that is not covered by natural ventilation.

Alex Wong

LEEDuser Basic Member

14 thumbs up

Fri, 05/14/2010 - 20:52

Thanks for your reply Roger, I think the confusion we are having is there is no prescriptive method to prove you are meeting ASHRAE 62 by means of partial ventilation and natural ventilation. It seems on the diagram at the top of the page if you have a mixed system you must meet 100% of the mechanical ventilation (VRP). But even if you have 95% of the openable window area required by section 5, we are still required to meet the rates required by the ventilation rate procedure. Does this seem a bit over kill?