We have several high rise residential projects that use a several conditioning and ventilation system. Typically the dwelling units are ventilated using whole house exhaust and permanent openings in the windows. The units also have operable windows, but not all of the floor area will comply with natural ventilation requirements. I assume this would be considered a 100% outside air system - but none of the monitoring options seem to apply. What would be an acceptable monitoring method for an exhaust based ventilation system?
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Ben Stanley
Senior Sustainability ManagerWSP - Built Ecology
LEEDuser Expert
250 thumbs up
August 23, 2016 - 3:22 pm
If the exhaust system is drawing in the ventilation air, could you install monitoring per the guidance on the second bullet point for constant volume systems? Install a current transducer on the supply fan, an
airflow switch, or similar monitoring device?
Only in this case, the monitoring device would be installed on the exhaust fan. I haven't seen this type of strategy implemented on a project yet and would be curious to see what others would suggest.
Nancy Henderson
Managing MemberArchEcology, LLC
83 thumbs up
August 23, 2016 - 5:05 pm
I don't see why that would not work, but since it is not a compliance path mentioned under mechanical ventilation, I was wondering if they were deliberately trying to exclude exhaust induced ventilation. ASHRAE 62.1-2010 clearly allows it though.
Nancy Henderson
Managing MemberArchEcology, LLC
83 thumbs up
August 25, 2016 - 5:50 pm
I received clarification yesterday from a LEED reviewer that a monitoring device on the exhaust fan would be acceptable - as required for a CV system. I am not sure how we will do this, since we don't have a central control system for the dwelling unit fans. We are researching some options, but if anyone has any ideas, we would love to hear about it.
Also, the reviewer directed us to LI #10416 that allows the use of ASHRAE 62.1-2013 in lieu of 2010. However, addendum 'a' revises the scope of the standard to exclude non-transient residential occupancies. ASHRAE 62.2-2013 has a corresponding addendum "g" which revises the scope of that standard to ALL residential buildings - including high rise. Base on this ruling and the addenda, ASHRAE 62.2-2013 may be used for v2009 and v4 multifamily high-rise projects for dwelling unit ventilation compliance.