I am trying to understand the VRP Compliance Calculator at the end of the template. I have completed the 62MZCalc spreadsheet, and it comes up with one answer for 30% increased ventilation. Our project complies with this number. If I enter data into the VRP Compliance Calculator, it spits out a larger number for 30% increase, and our project does not comply. Is this VRP Calculator required if one has already proved compliance with 62MZcalc? Under what circumstances is it mandatory to use it? Is it optional?
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Hernando Miranda
OwnerSoltierra LLC
344 thumbs up
September 15, 2014 - 7:06 pm
Unless the ventilation efficiency of every zone served by a system is identical the OA required will not be 30%. The total OA is driven by the zone that has the lowest Evz. If one zone has an Evz of 0.80, and all of the others an Evz of 1.00, the ASHRAE standard uses the 0.80 value to determine the OA. The zone with the 0.80 Evz is the critical zone.
Check to see what the range of values of your Evzs are. If they are far apart then the ventilation flows to each zone need to be adjusted. One solution is to rebalance (redistribute) the airflows to the zones. Take reduce the ventilation air to the highest Evz zones and use it in the lowest Evz zone.
Lawrence Lile
Chief EngineerLile Engineering, LLC
76 thumbs up
September 15, 2014 - 8:09 pm
Sorry, I am not quite sure the question was clear. We are trying to achieve the IEQc2 30% increased ventilation credit. (This hasn't got anything to do with 30% outside air, it has to do with achieving the IEQc2 Credit). According to the 62MZcalc spreadsheet, we comply. Is the "VRP Compliance Calculator" located on the IEQp1 Template a required submittal or is it optional?
Hernando Miranda
OwnerSoltierra LLC
344 thumbs up
September 15, 2014 - 9:16 pm
To achieve EAc2 with 30% OA at the zone level you will require more than 30% OA intake at the system level. The further away you are from 30% at the system level, the more out of balance the zones in the system are.
Michelle Robinson Schwarting
148 thumbs up
September 16, 2014 - 6:33 am
Hi Lawrence,
It's my understanding that if you're using the 62MZCalc spreadsheet you do NOT have to do the VRP Compliance Calculator or complete Appendix 1 of the LEED Credit Form. You upload your 62MZCalc files, fill in the end result values from 62MZCalc into Table IEQp1-2 on the LEED Credit Form for the "Offline Calculator," and I believe the only "logic" it has built in is simply the Yes/No evaluation -- no math, and no entries in Appendix 1.
Let us know if that doesn't work for you.