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RE: [EnergyPlus_Support] Re: Modeling Heating w/ "Chilled" Beams
Luke,
Generally an active chilled beam must use conditioned air or condensation will result and your client will be very unhappy. If you model a DOAS (which is the normal approach) plus fan coils with zero fan power � seems like it will work.
James V Dirkes II, PE, BEMP, LEED AP
<http://www.buildingperformanceteam.com/>www.buildingperformanceteam.com
Energy Analysis, Commissioning & Training Services
1631 Acacia Drive, Grand Rapids, MI 49504 USA
616 450 8653
From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of luke_dorna
Sent: Monday, March 25, 2013 10:17 AM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] Re: Modeling Heating w/ "Chilled" Beams
My only concern would be the treatment of the ventilation air. Since the active chilled beam would be conditioning that air, and there is only a "direct into zone" option for DOAS, I'm not sure how I would handle that.
I'm thinking that the four pipe induction unit would probably be the better bet, because it would mimic the induced air without having to play with the fan.
--- In <mailto:EnergyPlus_Support%40yahoogroups.com>EnergyPlus_Support@xxxxxxxxxxxxxxx, Jim Dirkes <<mailto:jim@...>jim@...> wrote:
>
> I wonder if there is any significant difference between a 4 pipe fan coil (with essentially zero fan power) and an active chilled beam. As far as I can tell, E+ normally assumes uniform zone mixing and applies the cooling or heating energy to whatever loads exist in the zone. That makes either system perform the same with possible exception of part load performance. That is certainly different for a chilled beam and a fan coil, but I don�t know how much different.nt. (My guess is that it�s not too much)
> > James V Dirkes II, PE, BEMP, LEED AP
> www.buildingperformanceteam.com<<http://www.buildingperformanceteam.com/>http://www.buildingperformanceteam.com/>
> Energy Analysis, Commissioning & Training Services
> 1631 Acacia Drive, Grand Rapids, MI 49504 USA
> 616 450 8653
>
> From: <mailto:EnergyPlus_Support%40yahoogroups.com>EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:<mailto:EnergyPlus_Support%40yahoogroups.com>EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of jeannieboef@...
> Sent: Sunday, March 24, 2013 12:45 PM
> To: <mailto:EnergyPlus_Support%40yahoogroups.com>EnergyPlus_Support@xxxxxxxxxxxxxxx
> Cc: <mailto:EnergyPlus_Support%40yahoogroups.com>EnergyPlus_Support@xxxxxxxxxxxxxxx
> Subject: Re: [EnergyPlus_Support] Modeling Heating w/ "Chilled" Beams
>
>
> Also, you could simulate more than one chilled beam (or any equipment) connecting them to different plants, although they all represent the same piece of equipment. Just make sure the one switches off when the other switches on.
> Jean
>
> Sent from my iPhone
>
> On 22.03.2013, at 21:44, "luke_dorna" <<mailto:luke.dorna@...%3cmailto:luke.dorna@...>luke.dorna@...<mailto:luke.dorna@...>> wrote:
>
>
> All,
>
> I am currently modeling an office space with active chilled beams. I was using the AirTerminal:SingleDuct:ConstantVolume:CooledBeam object with baseboard radiant to pick up the heating load. However, the designers have opted to remove the baseboard radiant and go with dual mode "chilled beams" that will also do the zone heating.
>
> Does anyone know a way to model chilled beam in heating mode, or do I need to move to the four pipe induction unit as a substitute? I don't think the induction unit accounts for the convective induction portion of the active chilled beam design.
>
> I was also thought of using a mixed water loop to attach the beams to, I'm pretty sure putting a chiller and boiler on the same loop won't end well for me.
>
> Thoughts?
>
> Thanks,
>
> Luke
>
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