Thanks for all of the input and suggestions! They were
VERY helpful.
The Building Performance Team
James V. Dirkes II, P.E., LEED AP
1631 Acacia Drive NW
Grand Rapids, MI 49504
616 450 8653
From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx]
On Behalf Of Griffith, Brent
Sent: Thursday, September 30, 2010 6:26 PM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: RE: [EnergyPlus_Support] Chilled Beams need a separate water
control loop
The chilled beam
model is controlled based on load and the heat transferred to the chilled water
won’t really vary with inlet water temps. The mass flows and temps
are different, but not the energy flow rate.
The return temps
into the chiller will depend a lot on the pumping configuration, the relative
magnitudes of flows, etc. But in many cases the mixing of different
return flows can work out to be not very different from what a higher-temp
secondary loop loads would do to a lower-temp primary loop. So yes, I
agree the single chiller approach can be adequate.
From: EnergyPlus_Support@xxxxxxxxxxxxxxx
[mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of James V Dirkes
II, PE
Sent: Thursday, September 30, 2010 11:57 AM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: RE: [EnergyPlus_Support] Chilled Beams need a separate water
control loop
Thanks, Brent.
Two chillers
changes part load relationships a lot.
Lower water temp
to the chilled beams probably affects their performance, too, but I suspect the
bigger impact will be on the chiller performance.
I think
I’ll go with the one chiller approach.
This might be a
nice item to add to the development list, if it’s not already on it!
The Building Performance Team
James V. Dirkes II, P.E., LEED AP
1631 Acacia Drive NW
Grand Rapids, MI 49504
616 450 8653
From: EnergyPlus_Support@xxxxxxxxxxxxxxx
[mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of Griffith, Brent
Sent: Thursday, September 30, 2010 12:36 PM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: RE: [EnergyPlus_Support] Chilled Beams need a separate water
control loop
In E+, you
either end up needing to use two separate chilled water loops (and two
chillers), or ignore the higher temp water for the beams and use one supply
temperature.
From: EnergyPlus_Support@xxxxxxxxxxxxxxx
[mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of jvd2pe
Sent: Thursday, September 30, 2010 7:45 AM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] Chilled Beams need a separate water
control loop
Dear Forum,
In a typical chilled water system using CHILLED BEAMS, you need:
* a chilled water loop for air handler coils at ~45F / 7C
* another chilled water loop for the chilled beams at ~60F / 15C
* both served by single chiller
Does anyone have suggestions about how to set this up in E+?
Thanks in advance!
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