RE: [EnergyPlus_Support] Identifying the cooling energy use of individual zones

Thanks Jim,

I am playing around with output variables now and still not having a huge amount of luck, but I like this approach you are suggesting. I think it might work. I am going to give it a try. This is more tricky than I was hoping it would be. No real surprises there!

Annie

To: EnergyPlus_Support@xxxxxxxxxxxxxxx
From: jim@xxxxxxxxxxxxxxxxxxxxxxxxxxx
Date: Tue, 14 May 2013 15:48:40 -0500
Subject: RE: [EnergyPlus_Support] Identifying the cooling energy use of individual zones

Annie,

I think I see the problem; your plant loop is providing the power and there is no cooling power user within the buildings except perhaps a pump.

I think this is a post-processing task in which you:

· report the building cooling energy transfer for each building using custom meters

· also the plant cooling power (Plant cooling power may have several elements and need another custom meter.)

· It seems that you can then proportion the power to your buildings based on their fraction of the total energy transfer.

James V Dirkes II, PE, BEMP, LEED AP
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 annie marston
Sent: Tuesday, May 14, 2013 4:41 PM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: RE: [EnergyPlus_Support] Identifying the cooling energy use of individual zones

I am using cooling coils and chilled ceilings, I can see a meter variable for cooling coils but it looks like it sums up all the coils and doesn't allow me to look at each one separately.

Maybe I am looking in the wrong place, I could get the sensible cooling for the zone from the variable outputs and then post process that in an excel sheet. Is it be possible to get the variable output of a zone list, rather than individual zones?

is it possible to use output variables in custom meters? and if so, what name would I use? could I use the variable name?

Also one more question, I see the zone system sensible cooling has changed to Zone Air System Sensible Cooling Rate, does this mean that this doesn't take into account radiant cooling energy in the zone?

Thanks again!

Annie

To: EnergyPlus_Support@xxxxxxxxxxxxxxx
From: jim@xxxxxxxxxxxxxxxxxxxxxxxxxxx
Date: Tue, 14 May 2013 15:31:50 -0500
Subject: RE: [EnergyPlus_Support] Identifying the cooling energy use of individual zones

I agree that ?energy transfer? is not the proper variable. What equipment are you using for cooling? There should be a variable that corresponds to ?Power? for each of those.

James V Dirkes II, PE, BEMP, LEED AP
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 annie marston
Sent: Tuesday, May 14, 2013 4:25 PM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: RE: [EnergyPlus_Support] Identifying the cooling energy use of individual zones

Thanks,

I have been trying this but the only meters available which are not overall total building cooling are "Cooling:EnergyTransfer:Zone:" or "coolingcoils:energytransfer" and energy transfer doesn't correlate with electricity used.

If either of you or anyone else has any other ideas, or can tell me what exactly "energy transfer" is reporting, I would very much appreciated it.

Thanks for the help so far

Annie

To: EnergyPlus_Support@xxxxxxxxxxxxxxx
From: jim@xxxxxxxxxxxxxxxxxxxxxxxxxxx
Date: Tue, 14 May 2013 14:06:38 -0500
Subject: RE: [EnergyPlus_Support] Identifying the cooling energy use of individual zones

p.s., These names changed dramatically in v8 (and I used the v8 names)

James V Dirkes II, PE, BEMP, LEED AP
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 Jim Dirkes
Sent: Tuesday, May 14, 2013 3:05 PM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: RE: [EnergyPlus_Support] Identifying the cooling energy use of individual zones

Annie,

It seems that Custom meters is the solution. Have you tried variables like ?Chiller Electric Power?? ?Pump Electric power??

James V Dirkes II, PE, BEMP, LEED AP
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 anniemarston25
Sent: Tuesday, May 14, 2013 2:52 PM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] Identifying the cooling energy use of individual zones

Dear All,

I am stuck at the moment. I have to model 3 different building on one plant loop and identify the energy use of each building. I can identify the loads using custom meters but I can't seem to identify the cooling and heating energy used in each building. The only meter I can find, reports cooling energy transfer which doesn't match the actual cooling energy used by the building. I can't find any output to identify the cooling energy use assigned to each zone in the meters outputs. Is this possible?

All help is always greatly appreciated.

Thanks very much in advance

Annie

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