Hi!
My Project has space types office, apartments (with residents) and overnight apartments (rented by the office tenant for office guests).
I'm having a little trouble filling out the water calculator..
Should the overnight apartent guests be places as;
1, residents with residentual fixtures
2, visitors with public fixtures
or
3, visitors with residentual fixtures (non-default daily uses)?
The flush and fixtures flows are the same as the apartments (with residents living there permanently), so another idea is placing the apartments + overnight apartments and residents+visitors together in the water calculator?
For the moment they are places as 2, visitors with public fixtures, by I have increased the Daily usages (5 visitors in average so I have written down 5 10 uses/day for water closets, lavatorys and kitchen sinks + 5 uses/day for kitchen sinks).
Susan Di Giulio
Senior Project ManagerZinner Consultants
153 thumbs up
December 1, 2015 - 5:19 pm
Option one. When they are occupied, the fixtures will be used that way: one shower per day per person, shaving and brushing teeth in the sinks, washing dishes; not the sparse water use of an FTE or commercial visitor.
However, in terms of how often these apartments are occupied, and by how many people, this seems to be closest to a hotel situation. And that involves some art in calculation.
I suggest working with the LEED default tables (back of NC Ref Guide) for the number of occupants, which is based on number of bedrooms, then apply an average occupancy factor. For hotels, it's usually 60-70%.
So if you have 10 1-bedroom units, at 2 people per unit, and 10 studios at 1 person/unit, and you assume about 60% of the units are occupied at any given time, you have (10x2 +10x1) x.60 = an average of 18 residential occupants.
If these assumptions are too low or too high for the reality of the situation, you can adjust the numbers, but you must make a reasonable case. Just be sure to describe it in a narrative (use the alternate method box or upload).