I use WUFI for analysis of wall performance. I have used HAMT in EnergyPlus a few times. It will increase your computation time. It can be problematic to
setup, it seems sensitive to layer thickness and material properties. It can’t duplicate WUFI results because E+ weather does not have reliable rain data. If you did want to do that, it would be a bear to output data you could use to evaluate the wall system.
That said, I used it model moisture buffering for a project. There was relatively little effect from just the walls of the zone, but when I filled the space with surfaces that simulated stored goods, I got a model that reasonably matched some recorded data
I had for the space. (Yes it would be nice if I published this, but it is unfortunately one of my many confidential projects).
So the question is whether it is worth the effort. I think that depends on your space. A hard surfaced (skim coat plaster, metal, wood/tile) museum may not
be as critical as a small living room (wall to wall carpet, stuffed furniture, soft popcorn ceiling, gypsum board). Data I recorded from the latter showed that the dry space took about 3 days to acclimate to sudden occupancy moisture generation.
Ned Lyon, P.E. (MA)
Staff Consultant
SIMPSON GUMPERTZ & HEGER
781.907.9000 main
781.907.9350 direct
781.907.9009 fax
www.sgh.com
From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx]
On Behalf Of geertbellens
Sent: Friday, October 05, 2012 3:54 PM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] experiance with HAMT model
Hi,
i'm an experienced Designbuilder user and sometimes I use E+ to complete the model for those things Designbuilder can't do.
I've had a question to simulate the effect of moisture buffering of walls on the indoor climate of a museum.
I've seen that E+ has a HAMT model to simulate this.
A question regarding HAMT in Designbuilder on the DB forum last year gave the following answer:
"I wonder though whether you are referring to the combined heat and mositure transfer capability in E+? We have looked at implementing this but are not satisfied that the current E+ finite difference calculations are sufficiently robust and these are required
for E+ moisture transfer calculations. We therefore decided to drop the option from DesignBuilder until the E+ capability is finished."
So here is my question: who has positive experiences with the HAMT model in E+ ? Is it robust enough to predict the effect of moisture buffering in walls?
Geert Bellens
__._,_.___
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.
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
__,_._,___