[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [EnergyPlus_Support] Integration of Makeup air units with zones
You can not use multiple air loops for a single zone because there can
only be 1 return node per zone. The makeup air model using PTACs works
because the PTAC is a piece of zone equipment that connects to an
exhaust node, not the return node. There is currently no WLHP that can
be modeled as zone equipment. The closest you could get would be to use
a single air loop for the WLHP and bring in the outside air through the
OA system connected to this air loop.
gordoncourt2000 wrote:
>
> This relates to a multistory apartment block served by Water Loop
> heat pumps. We developed the model with dedicated airloop for each
> apartment having the WLHP (as shown in one of the example files). The
> plant loop is served by the boiler and an air cooled chiller (to be
> finally replaced by a CT).
>
> Presently the model has outside air system with its OSA mixer and
> controller for each zone for each apartment. Since the outside air
> would be coming through the make up air unit, the controller OSA flow
> rate is set to zero both for minimum and maximum. The arrangement
> requires hooking up with a central makeup air unit. This is modeled
> as another airloop serving the multiple zones. But I am unable to
> connect the Makeup air inlet to the zone as we get error messages
> sayng that the heat pump and the zone are not linked. The way i tried
> to connect is to have two DIRECT AIR inlets i.e., the make up air
> DIRECT AIR from the make up air unit and another DIRECT AIR from the
> WLHP air loop.
>
> I thought of using PTHP to model the WLHP instead of Unitary
> HP/Direct air. But the PTHP model in EPlus handles only air to air.
>
> Is there a solution or a work around? I have seen makeup air models
> working with PTACs in EPlus.
>
> Please help
>
>
--
Richard A. Raustad
Senior Research Engineer
Florida Solar Energy Center
University of Central Florida
1679 Clearlake Road
Cocoa, FL 32922-5703
Phone: (321) 638-1454
Fax: (321) 638-1439 or 1010
Visit our web site at: http://www.fsec.ucf.edu
UCF - From Promise to Prominence: Celebrating 40 Years
------------------------------------
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 not allowed -- please post any files to the appropriate folder in the Files area of the Support Web Site.
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:
mailto:EnergyPlus_Support-digest@xxxxxxxxxxxxxxx
mailto: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/