HVAC Schedule in WUFI

All about WUFI Pro
Post Reply
Kenner
WUFI User
WUFI User
Posts: 7
Joined: Thu Feb 21, 2019 8:28 am -1100

HVAC Schedule in WUFI

Post by Kenner » Thu Feb 21, 2019 8:31 am -1100

Hi,

I'm attempting to simulate an exterior wall assembly for a school building. Because the school does not operate its HVAC systems during the summer months (01 June to 01 September), I am wondering if I can run a 3 year to 10 year simulation showing no space conditioning for these months. Is it possible to create a schedule in WUFI Pro to do this? Or do I need to have some work-around to approximate this condition.

Thank you for your time, everyone. Much appreciated.

Manfred Kehrer
WUFI International Support Team
WUFI International Support Team
Posts: 335
Joined: Thu Mar 10, 2005 2:17 am -1100
Location: Northbrook, IL; USA
Contact:

Re: HVAC Schedule in WUFI

Post by Manfred Kehrer » Thu Feb 21, 2019 8:35 am -1100

There is an excel spread sheet in the installation folder "tools" which allows you to create a WUFI climate file (.wac). That would probably serve the purpose.
Manfred
Wiss, Janney, Elstner Associates, Inc.
Official WUFI® Collaboration Partner for USA/Canada
Enjoy WUFI® :) .... It is easy and complex.

Kenner
WUFI User
WUFI User
Posts: 7
Joined: Thu Feb 21, 2019 8:28 am -1100

Re: HVAC Schedule in WUFI

Post by Kenner » Fri Feb 22, 2019 7:02 am -1100

Thank you Manfred.

Manfred Kehrer
WUFI International Support Team
WUFI International Support Team
Posts: 335
Joined: Thu Mar 10, 2005 2:17 am -1100
Location: Northbrook, IL; USA
Contact:

Re: HVAC Schedule in WUFI

Post by Manfred Kehrer » Fri Feb 22, 2019 7:09 am -1100

I just figured you registered yourself in the Forum with a WUFI educational license. It probably requires a professional license to use a user-defined climate file.
Manfred
Wiss, Janney, Elstner Associates, Inc.
Official WUFI® Collaboration Partner for USA/Canada
Enjoy WUFI® :) .... It is easy and complex.

Kenner
WUFI User
WUFI User
Posts: 7
Joined: Thu Feb 21, 2019 8:28 am -1100

Re: HVAC Schedule in WUFI

Post by Kenner » Thu Feb 28, 2019 10:26 am -1100

Hi Manfred,

Yes, I have an educational license but I believe I have full functionality of the Pro version? I was able to generate the interior conditions I need (temperature & relative humidity) using an Energyplus model. I then used the "createclimefile.xls" tool and exported a .WAC file to define the interior climate in WUFI. It seemed to work for temperature (showing higher peaks during the summer months that correspond to the Energyplus inputs). However, relative humidity shows a constant maximum of +/- 72% for some reason. I have attached screenshots of the climatefile.xls, and WUFI visualization of the .WAC file. as a user defined interior climate.

My question is, can I represent the RH only from the .WAC output (as these are an accurate representation of the energy model)? I'm curious why there appears to be a limit on RH when I am sure the .WAC file shows RH as high as 90% during the summer months when there is no conditioning and no occupancy in the model.

Any guidance on this is much appreciated.

Best,

Kenner
Attachments
WUFI-user-defined-climate-set.JPG
WUFI-user-defined-climate-set.JPG (184.52 KiB) Viewed 166 times
createclimatefile.JPG
createclimatefile.JPG (307.5 KiB) Viewed 167 times
WUFI-user-defined-climate.JPG
WUFI-user-defined-climate.JPG (219.23 KiB) Viewed 167 times

Manfred Kehrer
WUFI International Support Team
WUFI International Support Team
Posts: 335
Joined: Thu Mar 10, 2005 2:17 am -1100
Location: Northbrook, IL; USA
Contact:

Re: HVAC Schedule in WUFI

Post by Manfred Kehrer » Thu Feb 28, 2019 11:16 am -1100

I am not sure what happened here. Also this does look like a WUFI Plus version and I don't know the specifics about the climate reader in there
Manfred
Wiss, Janney, Elstner Associates, Inc.
Official WUFI® Collaboration Partner for USA/Canada
Enjoy WUFI® :) .... It is easy and complex.

Kenner
WUFI User
WUFI User
Posts: 7
Joined: Thu Feb 21, 2019 8:28 am -1100

Re: HVAC Schedule in WUFI

Post by Kenner » Thu Feb 28, 2019 11:32 am -1100

Hi Manfred,

Thanks for taking a look. It is WUFI Pro v6.2, not WUFI Plus.

Thanks again.

Best,

Kenner

Christian Bludau
WUFI SupportTeam IBP
WUFI SupportTeam IBP
Posts: 797
Joined: Tue Jul 04, 2006 10:08 pm -1100
Location: IBP Holzkirchen, the home of WUFI
Contact:

Re: HVAC Schedule in WUFI

Post by Christian Bludau » Wed Mar 06, 2019 9:35 pm -1100

Hi Kenner,

first: you are right, the educational version has no restrictions. It can do what you want.

What you are doing wrong is the use of the ASHRAE model. If I understand you right, you like to use the wac file directly as your climate source. In this case please select "From Map/File" instead of ASHRAE 160 and open your file there.

What you are doing with the ASHRAE 160 tab is deriving the indoor conditions on the right from your wac file. There is the cut off at 72% coming from.

Chirstian

Kenner
WUFI User
WUFI User
Posts: 7
Joined: Thu Feb 21, 2019 8:28 am -1100

Re: HVAC Schedule in WUFI

Post by Kenner » Thu Mar 07, 2019 1:02 am -1100

Hi Christian,

Thank you for the reply. Yes, I was making a mistake and not running the interior climate file on the proper tab. It appears to be working as expected now with your suggestion.

Thank you again.

Best,

Kenner

Post Reply