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RE: [EnergyPlus_Support] version 6: green roof updates
As stated in the IORef:
The RoofIrrigation object is used to describe the amount of
irrigation on the ecoroof surface over the course of the simulation
runperiod. This object is used to provide irrigation data using Schedule
objects that define rates of irrigation in meters per hour. These
schedules can be one of two types: Schedule, or SmartSchedule. The
Schedule type is used to force an irrigation schedule regardless of the
current moisture state of the soil. The SmartSchedule type allows the
precipitation schedule to be overridden if the current moisture state of
the soil is greater than 30% saturated.
EnergyPlus Documentation is searchable. Open
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At 03:27 AM 10/25/2010, Georgios KOKOGIANNAKIS
I do not have access in the code but can you have a look and let me know
if there is a connection between the green roof model and the
Dr Georgios Kokogiannakis
Centre for Sustainable Energy Technologies (CSET)
The University of Nottingham, Ningbo, China
mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of Linda
Sent: Friday, October 22, 2010 11:28 PM
Subject: Re: [EnergyPlus_Support] version 6: green roof
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
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
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
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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