topic occupants calculation in Project data & BIM

occupants calculation

mhoude — Mon, 17 Jul 2023 21:46:36 GMT

Need help to resolve my calculation problem. In canada we have to multiply area per person. Let say that 0.75 m2 per person. So I multiply my zone calculated area by area per person. Error this argument expect a Non-unit value.

Anyone can help me

Re: occupants calculation

JLopes — Tue, 11 Jul 2023 15:31:48 GMT

https://community.graphisoft.com/t5/Project-data-BIM/Using-Expressions-to-Calculate-the-Maximum-Number-of-Occupants/ta-p/304003

Re: occupants calculation

Erik Bjornhage — Wed, 12 Jul 2023 05:59:18 GMT

I'm just wondering whether your Data Type should be [Area] instead of [Integer].
Your expression is dealing with two values that are both areas - so the resulting product should also be an area...

...*EDIT* Ignore that - it should work anyway.

Re: occupants calculation

Barry Kelly — Wed, 12 Jul 2023 06:27:07 GMT

Your data type should be 'Number' not 'Integer'.

Also you want to divide the calculated area by the area per person, not multiply.

Barry.

Re: occupants calculation

Laszlo Nagy — Mon, 17 Jul 2023 21:54:52 GMT

mhoude,

You have to divide "Calculated Area" by "Area per person", not multiply it.

The unit of "Calculated Area" is Area (m2).

The unit of "Area per person" should also be Area (m2).

The result of this division will be a Number, which will be converted to an Integer by the ROUNDDOWN function so the Data Type of the "Number of Occupants" needs to be Integer.

Actually, I just checked this in Archicad 26, and the Property Manager already contains Properties for this purpose.

Under the "ZONES" Property Group, you will find the "Area per Occupant" and "Number of Occupants" Properties.

Re: occupants calculation

Laszlo Nagy — Mon, 17 Jul 2023 21:58:03 GMT

"Area" divided by "Area" is not "Area".

The "Area" Data Type is in m2.

The "Area per Occupant" Data Type is also m2.

When you divide one with the other, the result is not another "Area" Data Type, it is a "Number" Data Type, since m2 / m2 is a number without any unit of measurement.