RE: [EnergyPlus_Support] version 6: green roof updates

[Linda Lawrie <linda@xxxxxxxxxxxxxx>]

As stated in the IORef:

RoofIrrigation 
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
EPlusMainMenu.pdf under the Documentation link and press the
"search" button.



At 03:27 AM 10/25/2010, Georgios KOKOGIANNAKIS
wrote:

Thanks Linda.
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 ?RoofIrrigation? object?
 
Many thanks,

Dr Georgios Kokogiannakis
Centre for Sustainable Energy Technologies (CSET)
The University of Nottingham, Ningbo, China
 
 
From: EnergyPlus_Support@xxxxxxxxxxxxxxx [ mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of Linda Lawrie
Sent: Friday, October 22, 2010 11:28 PM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: Re: [EnergyPlus_Support] version 6: green roof updates
 
 

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

------------------------------------

Primary EnergyPlus support is found at:

http://energyplus.helpserve.com or send a message to energyplus-support@xxxxxxxx

The primary EnergyPlus web site is found at:

http://www.energyplus.gov

The group web site is:

http://groups.yahoo.com/group/EnergyPlus_Support/

Attachments are currently allowed but be mindful that not everyone has a high speed connection.  Limit attachments to small files.

EnergyPlus Documentation is searchable.  Open EPlusMainMenu.pdf under the Documentation link and press the "search" button.

Yahoo! Groups Links

<*> To visit your group on the web, go to:

    http://groups.yahoo.com/group/EnergyPlus_Support/

<*> Your email settings:

    Individual Email | Traditional

<*> To change settings online go to:

    http://groups.yahoo.com/group/EnergyPlus_Support/join

    (Yahoo! ID required)

<*> To change settings via email:

    EnergyPlus_Support-digest@xxxxxxxxxxxxxxx

    EnergyPlus_Support-fullfeatured@xxxxxxxxxxxxxxx

<*> To unsubscribe from this group, send an email to:

    EnergyPlus_Support-unsubscribe@xxxxxxxxxxxxxxx

<*> Your use of Yahoo! Groups is subject to:

    http://docs.yahoo.com/info/terms/

__._,_.___

Primary EnergyPlus support is found at:
http://energyplus.helpserve.com or send a message to energyplus-support@xxxxxxxx

The primary EnergyPlus web site is found at:
http://www.energyplus.gov

The group web site is:
http://groups.yahoo.com/group/EnergyPlus_Support/

Attachments are currently allowed but be mindful that not everyone has a high speed connection.  Limit attachments to small files.

EnergyPlus Documentation is searchable.  Open EPlusMainMenu.pdf under the Documentation link and press the "search" button.

Your email settings: Individual Email|Traditional
Change settings via the Web (Yahoo! ID required)
Change settings via email: Switch delivery to Daily Digest | Switch to Fully Featured
Visit Your Group | Yahoo! Groups Terms of Use | Unsubscribe

__,_._,___