RE: [EnergyPlus_Support] Effect of minimal HVAC loads on simulation results

[Ian Campbell <Ian-Campbell@xxxxxxx>]

Hello Peter Roosen and c_l_hailey


I have been planning work in low cost ways of gathering building parameters
from existing buildings 24/7.
I have also done some work in optimizing operations in existing buildings.

So these subjects interest me.

Ian Campbell
GPS Gas Protection Systems Inc.

If you (or anyone else, of course) is interested in a cooperation,
please drop me a line!


-----Original Message-----
From: Michael J. Witte [mailto:mjwitte@xxxxxxxx]
Sent: July 3, 2003 07:03
To: energyplus_support@xxxxxxxxxxxxxxx
Subject: Re: [EnergyPlus_Support] Effect of minimal HVAC loads on simulation
results

Hailey:

There is no implicit accuracy problem in the simulation for buildings
with low HVAC loads.  The primary issue for such buildings is that
the results become very sensitive to the building envelope and
internal gain characteristics.  Envelope U-values as-built are often
not as specified and infiltration is highly variable.  If trying to
match the performance of an existing building, it may be necessary to
measure the building's actual properties.  If trying to evalute a new
design, several cases should be run to try and bound the problem
using reasonable high and low values for parameters which are not
known precisely.

Mike


On 3 Jul 2003, at 0:58, c_l_hailey wrote:

> I have been doing some research into the accuracy of simulation
> programs on more innovative buildings.  Particularly, well-build
> residential buildings with A LOT of passive solar design incorporated,
> therefore requiring a minimal amount of mechanical HVAC.  These
> simulations seem to have exceptionally high margin of error when
> compared to theactual energy consumption.  Do you know if there is any
> relationship?  Does EnergyPlus not respond well to buildings with a
> HVAC system which only consumes say 30% of the structures energy?
>
> BTW - I am not very experienced with modeling, so I cannot tell you if
> there is error in the inputs of the models I am looking at.
>
> Thanks
>
> Hailey
>
>
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