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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