Re: [EnergyPlus_Support] Re: Eco roof

[Linda Lawrie <linda@xxxxxxxxxxxxxx>]

There are now two models in the Eco Roof simulation. 
The default is this more detailed one that calculates the desired number
of time steps.  The other is the older one that doesn't need quite
this detail.

In the roof vegetation material:

  A4; \field Moisture Diffusion Calculation Method
      \note Advanced calculation requires
increased number of timesteps (recommended 12).
      \type choice
      \key Simple
      \key Advanced
      \default Advanced


At 11:23 PM 7/10/2011, Jean marais wrote:
> I just used a timestep of 30
> over the week end and still get this msg:
>
>    ** Severe  ** CalcEcoRoof: Too few time steps per hour
> for stability.
>    **   ~~~   ** ...Entered Timesteps per
> hour=[30], Change to some value greater than [60] for assured
> stability.
>
>
> That's a lot of timesteps!
>
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Linda Lawrie <linda@...>
> wrote:
> >
> > Thanks, Ned.  I was going to point that out too.  While
> the weather 
> > files may show it's raining, they may not have the amount
> there.  The 
> > Site:Precipitation object should be included and accurate, at 
> > minimum, I think.  Not sure about the RoofIrrigation, I'd have
> to 
> > read the IORef carefully.
> > 
> > At 09:52 AM 7/8/2011, Edward G. Lyon wrote:
> > 
> > 
> > >You probably need the RoofIrrigation object because the rain
> data in 
> > >the weather files is generally not that reliable yet. 
> Although 
> > >there are fields for rain, the files used to make the weather
> data 
> > >often do not have more than a rain flag and I have found that
> even 
> > >that may be missing for some months of data.  You likely
> need to 
> > >schedule rain for your area.
> > >
> >
>
>
>
>
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