Question-and-Answer Resource for the Building Energy Modeling Community
Get started with the Help page
Ask Your Question
3

Zone Sizing Data with Ideal Loads

asked 2018-01-16 04:54:12 -0600

updated 2018-01-16 20:23:47 -0600

I want to quickly output zone-by-zone heating and cooling loads in the HVACSizingSummaryoutput report. The simplest approach I know is to use an HVACTemplate:Zone:IdealLoadsAirSystemobject. Though I can't seem to get my model to output the Zone:Sizing object like the other templates. For example when I replace the ideal loads air system and useHVACTemplate:Zone:VAVon the same exact model Zone:Sizing is created as it should.

I do have "do zone sizing calculation" selected in SimulationControl, and when I manually add Zone:Sizing, my simulation runs and the HVACSizingSummaryoutput report is populated. I just want to understand why the template isn't doing this like it should.

Here is a snapshot of my idf:

image description

and the expanded idf (no zone:sizing object):

image description

I can see that the zone:sizing object should show up in the expanded idf, as it does in the example file HVACTemplate-5ZonePurcAir, but it does not in my file.

edit retag flag offensive close merge delete

Comments

Do you have zone thermostats and design day temperature schedules defined for the zones in your ideal air loads model?

Lyle K's avatar Lyle K  ( 2018-01-16 18:09:22 -0600 )edit

Yes, and I can add a zone:sizing object myself, manually, and it works just fine.

Anna Osborne Brannon's avatar Anna Osborne Brannon  ( 2018-01-16 18:40:01 -0600 )edit

2 Answers

Sort by ยป oldest newest most voted
2

answered 2018-01-17 02:34:42 -0600

bbrannon4's avatar

You need to have it specified in simulation control, and something set to autosize in the template objects (some airflow or capacity or something), otherwise the simulation doesn't have anything to autosize. Leaving them blank defaults to unlimited, which doesn't call for sizing.

edit flag offensive delete link more
2

answered 2018-01-16 06:05:17 -0600

Avi's avatar

updated 2018-01-16 11:37:35 -0600

Expand does create sizing:zone object. make sure you specified in simulationcontrol sizing.

simulationControl,
  Yes,                                    !- Do Zone Sizing Calculation
  Yes,                                    !- Do System Sizing Calculation
  Yes,                                    !- Do Plant Sizing Calculation
  Yes,                                    !- Run Simulation for Sizing Periods
  Yes;                                    !- Run Simulation for Weather File Run Periods
edit flag offensive delete link more

Comments

Yes, I have the zone sizing simulation control specified. I tried it on an example file and it works as you said, but it does not work in my file. I must have something else wrong, so I'll keep digging. I've updated the question with more details.

Anna Osborne Brannon's avatar Anna Osborne Brannon  ( 2018-01-16 16:16:22 -0600 )edit

Your Answer

Please start posting anonymously - your entry will be published after you log in or create a new account.

Add Answer

Training Workshops

Careers

Question Tools

2 followers

Stats

Asked: 2018-01-16 04:54:12 -0600

Seen: 778 times

Last updated: Jan 17 '18