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

["Michael J. Witte" <mjwitte@xxxxxxxx>]

Yes, EnergyPlus will model the building according to what you 
specify, including wall construction properties, infiltration amount, 
etc.

Mike

On 3 Jul 2003, at 15:59, c_l_hailey wrote:

> So my understanding of what you said is that when HVAC loads are
> minimized the quality of construction and quality of installation
> become very important to the simulation program - does EnergyPlus have
> the capability to take these into consideration?
> 
> Thanks again -
> 
> Hailey
> 
> 
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Michael J. Witte" 
> <mjwitte@g...> wrote:
> > 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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