Re: [EnergyPlus_Support] version 6: green roof updates

[Linda Lawrie <linda@xxxxxxxxxxxxxx>]

A good question.  It came in very late in the release
cycle.  And here is what the developer gave me:


Old Moisture Model

The old moisture model was based on a constant diffusion of moisture
through the soil.  This model started with the soil in two
layers.  Every time the soil properties update is called, it will
look at the two soils moisture layers and asses which layer has more
moisture in it.  It then takes moisture from the higher moisture
layer and redistributes it to the lower moisture layer at a constant
rate.

Moisture Model Update

The new moisture transport model is based on a project which looked
at the way moisture transports through soil.  It uses a finite
difference method to divide the soil into layers (nodes). It
redistributes the soil moisture according the model described
in:

Marcel G Schaap and Martinus Th. van Genuchten, 2006, 'A modified
Maulem-van Genuchten Formulation for Improved Description of the
Hydraulic Conductivity Near Saturation?, Vadose Zone Journal 5 (1), p
27-34.

I neglected to get anything into the documentation.  However, due to
increased run times with the new model, I allowed the old model to remain
as an option.

(The above was basically all I was given for documentation.)

Sorry for the confusion.

At 07:23 AM 10/22/2010, Georgios KOKOGIANNAKIS wrote:
> Hi everybody,
>
> Is there any information on the new updates of the Green roof model? I
> can see that there is now an extra option for "Moisture Diffusion
> Calculation Method" and that the available choices are
> "Advanced" and "Simple". However, this entry is not
> included in the input/output documentation and it is neither described in
> the Engineering Reference Document. Is there any document that describes
> the changes? Are the changes related with the "RoofIrrigation"
> object and in what way?
>
> Many thanks,
>
> Dr Georgios Kokogiannakis
> Centre for Sustainable Energy Technologies (CSET)
> The University of Nottingham, Ningbo, China
>
>
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