The credit prompts you to fill out 2007UM_62MZCalc.xls to calculate required OA, and transfer the data to submittal form in LEED online under "Table. Ventilation Air Flow Summary." However, with the multi-tenant high-rise building we're working on, this would require us to add thousands of rows in the table and a lot of efforts inputting calculations we've already done. Is it possible to upload the completed 2007UM_62MZCalc.xls spreadsheets in lieu of submitting data in the table?
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Maria Unruh
Electrical EngineerAntella Consulting Engineers
72 thumbs up
January 21, 2011 - 12:46 pm
I'm confused about this issue as well. If LEED expects users to complete the spreadsheet why is it not given as an option to upload? The table on LEED Online doesn't allow as much detail as the ASHRAE spreadsheet, so I am certainly confused as to what LEED is looking for here...
Dan Ackerstein
PrincipalAckerstein Sustainability, LLC
LEEDuser Expert
819 thumbs up
January 21, 2011 - 3:34 pm
Interestingly, this issue has recently cropped up on a pair of my projects as well, and been equally frustrating. Here's what (little) insight I can offer - the compliance model for this credit has historically been for projects to complete the 62MZCalc spreadsheet for each AHU in the building, and then upload ALL of the completed calculators. The information in the spreadsheets was also required to be transferred to a simple table that identified each AHU, the required OA, and the measured OA. This made sense but required a lot of individual uploads/downloads for projects and reviewers. More recent projects, however, do not seem to be required to provide the 62MZCalc spreadsheets - they are simply expected to populate a revised LEEDOnline table/calculator, which ostensibly mimics/simplifies the 62MZCalc into just a handful of inputs. So there are two questions here: 1. Can we provide a pile of 62MZ calculators in lieu of completing the table, and 2. What if the 62MZ calculator and the table generate different results for a given AHU (because of the lesser level of detail).
1. I feel like the answer to this is no - if you've completed the 62MZCalc spreadsheet for your building, you've already done 95% of the work. Transferring the key data into LOL is a headache, but it also eliminates an enormous headache for the GBCI reviewer. It's not uncommon for that table to be dozens of rows (although thousands would be a first for me).
2. The table on LOL should capture all the key elements of the 62MZCalc in one simple format. If for some reason it fails to accurately describe your building or a specific unit, I would use the alternative compliance path option to explain your situation and upload your 62MZCalcs.
Ultimately, GBCI is looking for a simple, clear way to understand compliance with what is admittedly a complicated standard and calculation. Hopefully the table in LOL is a step in that direction, but if it is creating more problems than it solves, explain how/why to the reviewer and provide your 62MZ calculators to back up your case.