[bldg-sim] energy use in buildings

[Alpana Jain]

Hi, 

 

I am being faced with a very interesting problem in eQUEST. And I just
can't find a way to explain it. Maybe someone can help?

 

I am modeling 3 generic building sizes - small (4300sqM) medium
(7400sqM) large (11300sqM) in three different climates - Hot, cold and
temperate.

 

Typically one would expect energy use on a per sq ft basis to go down as
the building goes up in size.

In this case the annual energy use per sq ft is the highest in the
medium size building, it's the lowest in the large building and is
slightly higher than the large in the small building.

 

For instance in the cold climate it is - 

Small - 70.7 kBtu/SqFt/Yr

Medium - 85.8 kBtu/Sqft/yr

Large - 68.2 kBtu/sqft/yr

 

All parameters in all the three buildings are same, and the buildings
are similar in design. The medium size building adds a storey to convert
to a large building and drops a storey to convert to a small building.
Then entire design is very generic.

 

Does anyone have any suggestions as to why this could be happening?

 

Also when I look at the BEPS report - I notice that in absolute terms,
the space cooling energy is higher in the medium building than the
large, which is really not possible! 

 

Can anyone help?

 

Regards

Alpana



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