Quote:
Originally Posted by Kelvin
The old rule of thumb for proportioning elevators was 1 standard cab per 45,000 sq.ft gross floor area. However, today elevators can be a little faster and more programmable, so some additional efficiency is likely achieved. That is for commercial space.
I can only assume that there is less demand in a residential application.
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beyond the old 1:50 or 1:40 rule, the number of stops will come into play on an office building with smaller floor plates. more than 15 floors tends to be pushing it, so a bank of 4 elevators serving a boutique office tower with 10,000 square foot floors may end up serving even less than 40k per cab. at the opposite end, banks of more than 8 become problematic because the lobbies are too large and people standing in the wrong spot don't have time to make it to the cab, among other things. at 1:50 that means one bank won't usually go past 400,000 square feet, or 15 26,650sf floors. many very large office buildings have bigger footprints than that, so you may not even get 15 floors. this is why really big office buildings have sky lobby floors - so you can stack the shafts for the banks on top of each other, e.g. 6 banks serving 10 floors each can be stacked so that they only take the space of 3 banks plus one bank for the shuttles.
in residential the number of units per floor and the number of stops is all you care about, and the number of stops tends to be a bigger factor except in very low end buildings. the minimum is 2 and you can serve up to about 65 stories in a single bank of 4-6 elevators.
destination elevatoring might save you a cab or two per bank.