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Fresh air and energy savings
Outdoor air delivery monitoring ensures that the ventilation system, whether natural or mechanical, provides enough fresh air to occupants. The credit requires carbon dioxide (CO2) and outdoor airflow monitors that signal when fresh air is needed according to minimum set points defined by ASHRAE 62.1-2007. Typical ventilation design (without monitors) tends to encourage increased ventilation that may result in increased energy use and added cost for conditioning increased amounts of outside air. However, the addition of sensors and monitors allows ventilation to be delivered on demand only when required, potentially saving a lot of energy during unoccupied hours in spaces with varying occupancy.
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6 Comments
Non-Densely Occupied Space Ventilation
The form for IEQc1 asks you to fill out table IEQc1-1 for all mechanical ventilation systems where 20% or more of the design supply airflow serves non-densely occupied spacesNon-densely occupied spaces are areas with a design occupant density of less than 25 people per 1,000 square feet (40 square feet or more per person).". There is no instance on the project where a mechanical system serves 20% or more of the design supply airflow to non-densely occupied spaces yet if you leave this table blank the form is incomplete. Should I just note in the special circumstances section? Thanks!
I believe that if you uncheck the box towards the top of the form that says " This project contains non-densly occupied spacesOccupied Spaces are defined as enclosed spaces that can accommodate human activities. Occupied spaces are further classified as regularly occupied or non-regularly occupied spaces based on the duration of the occupancy, individual or multi-occupant based on the quantity of occupants, and densely or non-densely occupied spaces based upon the concentration of occupants in the space.," the IEQc1-1 upload and IEQc1-2 table will be removed from the form.
LPE Exemption for IEQc1
When completing the credit form for IEQc1 and asserting Licensed Professional Exemption(LPE)...........there is NO means to upload supporting information nor a narrative. Am I correct to understand that asserting LPE eliminates the need to upload supporting information?? Seems too good to be true!
That's what LPE is all about!
The flipside is that the documentation probably needs to be there anyway so that the professional in question feels comfortable signing off. But it doesn't need to be uploaded.
CO2 Monitors in Non-Densly Occupied Spaces
Can Co2Carbon dioxide sensors be used in lieu of airflow monitoring for non-densly occupied spacesOccupied Spaces are defined as enclosed spaces that can accommodate human activities. Occupied spaces are further classified as regularly occupied or non-regularly occupied spaces based on the duration of the occupancy, individual or multi-occupant based on the quantity of occupants, and densely or non-densely occupied spaces based upon the concentration of occupants in the space.?
If the HVAC systems have limited capabilities to provide OA monitoring system then CO2Carbon dioxide differential monitoring is acceptable. There are few conditions that the design has to meet. CO2 sensors should be located in all the spaces and and a CO2 sensor on the OA intake. The CO2 differential between the OA CO2 and the space CO2 cannot exceed 530 PPMParts per million.. If it exceeds then the system should be capable of increasing the ventilation rate in the spaces to bring down the CO2 differential below 530 PPM. If the design can meet the above criteria then CO2 sensors can be used in lieu of air monitoring system.
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