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A BAS is the best approach
Buildings with a building automation system (BAS)A building automation system (BAS) uses computer-based monitoring to coordinate, organize, and optimize building control subsystems, including lighting, equipment scheduling, and alarm reporting., or some level of existing outdoor airflow monitoring, have the best shot at this credit, which can help you to monitor and maintain adequate ventilation levels throughout the building. If your building does not have a BAS, compliance will be more challenging.
Most buildings don’t already have the proper monitoring devices, and device installation along with the configuration of the existing ventilation system may...
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11 Comments
Outdoor Airflow Measurement with constant volume ventillation
Our building measures the outdoor airflow at the AHU1.Air-handling units (AHUs) are mechanical indirect heating, ventilating, or air-conditioning systems in which the air is treated or handled by equipment located outside the rooms served, usually at a central location, and conveyed to and from the rooms by a fan and a system of distributing ducts. (NEEB, 1997 edition) 2.A type of heating and/or cooling distribution equipment that channels warm or cool air to different parts of a building. This process of channeling the conditioned air often involves drawing air over heating or cooling coils and forcing it from a central location through ducts or air-handling units. Air-handling units are hidden in the walls or ceilings, where they use steam or hot water to heat, or chilled water to cool the air inside the ductwork.. As we have a constant volume system (fan-coils) with 100% fresh air, from that point onward the airflow is not varied. The balancing of the system was checked and confirmed as part of the commissioning process, thus the volume of fresh air delivered to each zone only changes if the outdoor air volume changes at the AHU.
Do we need to have separate outdoor airflow measurement devices for every zone, or is the installed system level measurement device sufficient to meet the credit requirements?
Measuring OSA at the AHU1.Air-handling units (AHUs) are mechanical indirect heating, ventilating, or air-conditioning systems in which the air is treated or handled by equipment located outside the rooms served, usually at a central location, and conveyed to and from the rooms by a fan and a system of distributing ducts. (NEEB, 1997 edition) 2.A type of heating and/or cooling distribution equipment that channels warm or cool air to different parts of a building. This process of channeling the conditioned air often involves drawing air over heating or cooling coils and forcing it from a central location through ducts or air-handling units. Air-handling units are hidden in the walls or ceilings, where they use steam or hot water to heat, or chilled water to cool the air inside the ductwork. is sufficient. The airflow to the FCUs will be proportional from that point on based on the balancing.
CO2 testing
Need to know if I need to do a CO2Carbon dioxide test on Case 1 Mechanically Ventilated spaces.
No, you don't—see the flow chart and other information above.
Natural Ventilation
Our building is mostly naturally ventilated. One of the seven floors, however, has a central air system installed that serves three densely occupied conference rooms. Which case (or cases) do we need to follow? All 3?
In addition, we do not currently have a Building Automation System. Will this be required to achieve this credit? Is a BAS required for Case 3?
Any comments or suggestions would be greatly appreciated. Thank you!
Melissa, from what you say it sounds like cases 2 and 3 are appropriate here.
A BAS is not strictly required to earn the credit, but as discussed above, it helps. Given that the area subject to case 2 is relatively concentrated, though, perhaps it would be cost-effective to pursue the credit without a BAS.
Definition of Occupied Space
LEED EBOMEBOM is an acronym for Existing Buildings: Operations & Maintenance, one of the LEED 2009 rating sytems. ed 2009, page 366, 1st paragraph, "if total SF of all dense space is less than 5% of total occupied SF for the project building, the requirement......."
what is the definition of occupied space? does elevator , restroom, lobby, storage room, etc, consider occupied space which has outdoor air flow served to these area?
Jason - I'd love to hear others input on this, but the Reference Guide doesn't seem to define either 'occupied square footage' or the related term 'REGULARLY occupied square footage.' I would assume that the former is effectively the actual interior space of the building (excluding walls, partitions, structural elements, etc...) while the latter further excludes portions of the occupied SF which are not actually occupied by people most of the time - I would exclude the elevator, storage rooms, mechanical rooms etc... and then waffle about what to do with bathrooms and lobbies. Any other ideas out there?
Does IEQp1 Case 2 qualify for this measure?
Our contractor is telling us we can not meet 62.1-2007 because we do not have the chiller capacity, but we can meet the 10 cfm/person requirement of case 2. If we go this route, does this disqualify us from attempting IEQc1.2?
I don't think that IEQp1 case 2 is necessarily counter to IEQc1.2. Do you think you can meet the IEQc1.2 requirements?
That is the plan. We hired this contractor to ensure we met IEQp1, and install monitoring for IEQc1.2. We are trying to ensure p1: Case 2 won't hinder our plans for achieving c1.2.
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