Re: [EnergyPlus_Support] Modeling of fan coil system

[Don Shirey <shirey@xxxxxxxxxxxx>]

The next version of EnergyPlus, to be released later this month, will 
include a new piece of zone equipment called Packaged Terminal Air 
Conditioner (PTAC). The PTAC has a DX cooling coil, and it can also 
include a hot water heating coil.  This new object might meet your needs 
(instead of the UNIT VENTILATOR).


josh_miarch wrote:
> Howdy;
>
> I'm attempting to model a ventilation system that isn't well-supported
> by EnergyPlus, and I'm looking for some guidance.
>
> In this system, outside air is first heated to about 18°C by a central
> AHU and delivered to each zone directly through a fan coil unit (to be
> clear: what would typically be an outside air inlet on the fan coil
> unit is instead connected to the central AHU). The fan coil then
> tempers the air from the AHU (which is mixed with air recirculated
> from the zone) to address any heating or cooling loads. The heating
> coil in the fan coil unit is a hot water coil, and the cooling coil is
> a DX coil.
>
> This is problematic for a number of reasons, the first of which being
> that EnergyPlus doesn't, to my knowledge, support the delivery of
> central air to fan coils in the manner I've described above. To get
> around that, I had set up the model to use a DIRECT AIR object to
> deliver air directly to the zone and gave it #1 heating/cooling
> priority in the ZONE EQUIPMENT LIST. I then created a UNIT VENTILATOR,
> configured it in such a way that it would use essentially zero outside
> air, and then gave it #2 heating/cooling priority. 
>
> I then ran into my second problem: one can't use DX coils within a
> UNIT VENTILATOR. So, now I'm really at a loss as to how to best model
> this. Any suggestions would be greatly appreciated.
>
> Thanks a lot,
>
> Josh
>
>
>
> Josh Kjenner, EIT, LEED AP
> Manasc Isaac Architects Ltd.
> 10225 100 Avenue :: Edmonton, AB T5J 0A1
> 780.429.3977
>   


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/