I am confused by what seems to be contradictory information in the Reference Guide and what my LEED reviewer commented.
The comment says, "It is not clear whether the claimed daylight zones would be as large as noted in the calculator for the [specified rooms]. Provide floor plans that shows the daylight zones for each space used in the calculations. Along with the plans, provide sections showing how the depth of the zone was established."
When I go through the reference guide, the instructions never describe where a daylight zone is part of the equations. I see the "2H Daylight Zone" and "Modified Daylight Zone" indicated in Figure 2 on page 557.
However, in the method described on page 556 and 557, and also shown in Table 2 on page 558, the Floor Area (FA) is calculated with the full depth of the bay, in the example it is Bay Width 20ft and Bay Width to Core 40ft for an FA area of 800sf. The equation then calculates WFR=WA/FA and then VLT*WFR. The result of VLT*WFR is used to determine compliance. The spreadsheet provided (Supplemental Daylight and Views Calculation Spreadsheet) uses the same method, with one difference. The FA used in the spreadsheet is titled "Zone Floor Area" which is defined in footnote 2 thus: " Zones cannot overlap and are user defined based on the windows in the space. The zone size can be reduced as needed to increase the window to floor area ratio."
Nowhere in any of this does it require the calculation of a Daylight Zone as shown in Figure 2.
So, in my spreadsheet I have a room that is 859sf. The window area is 172sf, the Tvis is 0.64. I modified the Zone Floor Area to be 736sf, which results in a VLT x WFR of 0.150. The spreadsheet then includes 736sf in the Sidelighted Area Subtotal.
According to my reviewer's comments, I have done something incorrect and they want me to indicate the Daylight Zone on the floor plan. Have I done the calculation incorrectly?