# Calculate energy usage of individual buildings in a campus

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Hello All -

I am modelling a campus in eQuest which has 7 building. All building are
connected to the central chiller and boiler. I am trying to figure out how
much of the chiller capacity each building is using from the chiller and
how much of the boiler capacity each building is using.

Which reports in eQuest give this breakdown of eneryg usage? OR Do we have
to calculate these number, if so please give a brief explanation.

Thank You.

--

*- Pranita *

Pranita Kothuru
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Pranita - I am going to guess SS-A, as SS-D is the Coincident peak cooling and heating loads for the entire Plant. But realize that, even if you can determine the peak load per building, this won't be a coincident load.

John Aulbach

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Pranita,
Could you create a secondary loop for each chiller? You could then get the numbers you need from the PS-D or PS-H report.

Vikram Sami, LEED AP BD+C

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Hi everyone,

I have a building with frosted glass overhangs that are fairly large, about 10 feet out. I am only concerned with the energy component of my model and do not have any daylighting controls so this should make things easier. My gut tells me the frosted overhang will reduce and potentially eliminate the direct solar heat gain component. Has anyone studied this?

Thanks,

Neil Bulger

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Neil,
That's a tough one. Frosted glass should probably not be used - apart from the glare issue. It will block heat gain only so far as the solar heat gain coefficient of the glass. Apart from that it will transmit - albeit in a scattered manner. Translucent glasses differ alarmingly compared to each other - so it's hard to generalize, but most translucent glass is directionally biased so most of what's transmitted will get through in more or less the same direction. Some of it might miss the window - depending on view factors.

Although this might be oversimplifying it, I would model it as a shade with transmittance equal to the SHGC of the glass - maybe factoring in a percentage to account for the scatter effect.

Vikram Sami, LEED AP BD+C

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Neil,

You can enter a transmittance for the shade if it is entered as a "Building Shade" or a "Fixed Shade," but not if it's entered as a "Window Shade."

In detailed edit mode, in the "Building Shell" module, right-click on "Building Shade" (or "Fixed Shade") to create a new one. See the help screens and tutorials for an explanation of the dimensions and coordinates. The field for the transmittance is on the right side. So is visible reflectance, which can affect glare. You could also create a schedule to change the transmittance for when it might be covered with snow, leaves, or whatever. On a side note, this method using a schedule could also be used to model a deciduous tree that shades during the summer but not in the winter.

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Keith Swartz, P.E., LEED AP

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