Question-and-Answer Resource for the Building Energy Modeling Community
Get started with the Help page
Ask Your Question
0

How to run simulation for run Weather File Run Period ONLY

asked 2021-11-30 09:19:52 -0600

mdengusiak gravatar image

updated 2021-11-30 15:25:19 -0600

I have an OpenStudio file with weather file .epw and just want to run the simulation without any sizing based on design days. I removed the design days selected

image description

but got error
image description

see attached OSM file ...ok can not be attached :(

I can see that my eplusout.err is empty
Q1. Is it possible to run simulation without design days?
Q2. why can not see an error?

edit retag flag offensive close merge delete

1 Answer

Sort by ยป oldest newest most voted
1

answered 2021-12-09 12:05:09 -0600

Does your IDF have any autosized equipment/fields? If so, you need to run sizing calculations before running an annual simulation. If all of your equipment is hardsized, you can run only the annual simulation.

The empty .err file indicates a crash, rather than just a failed simulation. Try running the IDF with EP-Launch and enable View/Options/Command Window and check Pause During Simulation, this might give you a hint into what's causing the crash.

edit flag offensive delete link more

Comments

@ericmartinpe thanks a lot this is a good suggestion for me to better understand. I do have autosize. I thought that if I set 'off' for sizing and simulation for the sizing period it will size me based on the annual simulation. But I guess will have to fix - hardsized first to run just the annual simulation. Is that correct? I am unable to lunch via EP as I have some none convex shapes and only OpenStuio allows me to run it when using PixelCouting settings.

mdengusiak gravatar image mdengusiak  ( 2021-12-09 15:38:20 -0600 )edit

Yes, the equipment sizing is calculated based on the design days specified in the SizingPeriod:DesignDay objects. You can extract the autosized equipment values (capacities/flow rates) from the annual simulation output files, and replace the "autosize" with the number.

I'm not sure you need to simulate with OpenStudio just because you're using PixelCounting - what happens if you simulate with EP-Launch or command line?

ericmartinpe gravatar image ericmartinpe  ( 2021-12-09 16:57:57 -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

Question Tools

1 follower

Stats

Asked: 2021-11-30 09:19:52 -0600

Seen: 44 times

Last updated: Dec 09 '21