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Is it possible to submeter a single building of a multiple building model?

asked 2015-06-01 11:52:21 -0500

updated 2015-07-11 16:57:16 -0500

When including multiple buildings in a single model, is it possible to easily submeter the outputs by building? For example, EnergyPlus has ZoneList and ZoneGroup objects, but I'm not sure if these show up in the Output:Meter:* objects. The application here is for campus modeling for LEED certification which allows for grouping building and separately reporting them.

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I asked this very question a few months ago to the energyplus yahoo group. The general consensus was no. However someone did send me some nice scripting which I will try to dig out and send to you

Annie Marston gravatar image Annie Marston  ( 2015-06-04 09:46:38 -0500 )edit

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answered 2015-06-04 10:20:58 -0500

Here is the email chain, my question was slightly different I see now but it comes to the same thing, how do we separate the heating and cooling required if the plant is supplying to all zones. (it won't let me attach an idf, I can try to send it to you via email or if one of the unmethours folks could help out that would be great!)

Hi Annie,

Just a minor update of the code to prevent "dividing by zero" error (which doesn't occur in your example but can happen under certain circumstances). Comments are in the file.

Cheers, Ivan

Dr Ivan Korolija IESD, De Montfort University, Leicester, UK

From: annie marston anniemarston@hotmail.com To: "EnergyPlusSupport@yahoogroups.com" energyplus_support@yahoogroups.com Sent: Friday, May 17, 2013 8:01 PM Subject: RE: [EnergyPlusSupport] Re: Identifying the cooling energy use of individual zones

Wow thanks Ivan, that is brilliant! Thanks. I will take a good look at the EMS this looks like a great solution. Gosh the knowledge and helpfulness of this help group continues to amaze me, thanks again.

Annie

To: EnergyPlusSupport@yahoogroups.com From: ivankorolija@yahoo.com Date: Fri, 17 May 2013 10:30:01 -0700 Subject: Re: [EnergyPlusSupport] Re: Identifying the cooling energy use of individual zones

Hi Annie

I like Jean's approach. I spend some time today exploring the file you uploaded. The HVAC system has 4 chilled water branches (AHU's Cooling Coil loop + 3 chilled ceiling elements in B1Office, B1Office2 and B2Caffe) and bypass. Air is distributed to all thermal zones from the central AHU.

The question you would like to answer is how much chiller's electricity is consumed by Building 1 (B1Office + B1Office2) and by Building 2 (B2Cafe).

These are proposed steps: 1. Calculate fractions of the mass flow rate for each of 4 chilled water branches (note that the branch flow rate is divided with the pump flow rate decreased by bypass flow rate). This is used to calculate the portion of chilled water pump energy dissipated into each of the chilled water streams (energy which needs to be removed by the chiller as well). 2. Determine the chiller load from individual cooling elements (there are 4 cooling elements: cooling coil and 3 chilled ceiling elements). Equation looks like (cooling coil is in example): QCCChLoad = MassFlowRateCC * cp * (TCCout - TCCin) * TimeInterval[sec] + CCMassFlowRateFraction * CHLPumpHeatGain Second part of the equation is to add pump dissipated heat to the water stream. 3. Calculate fractions of the air flow rates for each of 3 thermal zones (Air Terminal Flow Rate / AHU Flow Rate). 4. Determine the chiller load from individual thermal zones. For example: B1OfficeChLoad = B1OfficeChilledCeiling chiller load (calculated in the step 2) + B1OfficeAirFlowFraction * CoolingCoil chiller load. Second part of the equation assigns the portion of cooling coil cooling energy (used to treat the air distributed to the thermal zone). 5. Knowing the ... (more)

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Asked: 2015-06-01 11:52:21 -0500

Seen: 766 times

Last updated: Jun 04 '15