RE: [EnergyPlus_Support] Modeling of fan coil system

["Griffith, Brent" <brent_griffith@xxxxxxxx>]

With ver 2.0, you could use a Window AC for the DX coil and baseboard hot water for heating.  These two pieces of zone equipment would follow the Direct Air in the zone equipment list.

 

 

 

________________________________

From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of Don Shirey
Sent: Tuesday, October 16, 2007 10:38 AM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: Re: [EnergyPlus_Support] Modeling of fan coil system

 

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
> 

 



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