buddy1187's profile - activity

Hello all!

I'm about 80% of the way through creating the envelope of my building, however when I load my model in Sketchup to finish adding some more windows, the geometry does not appear. My Sketchup outliner loads with no spaces, however when I look at the OpenStudio Inspector, I see all of my spaces and surfaces. When I clicked on a space in the space list in the OpenStudio inspector, it showed up. I clicked another space and it showed up only as a black dot (see pic below).

I am loading my .osm file with the OpenStudio toolbar, so that is not a problem. I'm thinking it could be due to the size of the building, but I wouldn't see why it would fail to load.

C:\fakepath\Oakland.JPG

Thanks Eric, I just realized that when I was typing the question! That's why I deleted the question. Thanks again!

Hello,

I'm running my simulation and I'm getting a perplexing error with a cooling coil which is zeroing out water flow in the coils leading to know cooling of the zones the equipment is treating. The simulation is spitting out this error:

** Warning ** The design cooling capacity is zero for Coil:Cooling:Water COIL COOLING WATER 1

* ~~~ * The maximum water flow rate for this coil will be set to zero and the coil will do no cooling. * ~~~ * Check the following coil design inputs for problems: Tair,in = 26.7222 * ~~~ * Wair,in = 51.500000 * ~~~ * Twater,in = 5.5556 * ~~~ * Tair,out = 10.5556 * ~~~ * Wair,out = 95.000000

I am simulating an already existing building which has all these parameters as the cooling coil design, so all of these parameters are hard sized. I don't know why I'm getting this error as I don't see any problems with the inputs of the cooling coil. The cooling coil has the following inputs:

I've tried to use both simple analysis and detail analysis with the same error. Anyone have any thoughts?

Hello all,

I'm getting a few warnings (which I would like to get rid of) in my simulation when it comes to the user defined sizing on my VAV w/reheat and the design. Here is the error I am getting for a few of my VAV boxes:

*** SizeHVACSingleDuct: Potential issue with equipment sizing for AirTerminal:SingleDuct:VAV:Reheat = "AIR TERMINAL SINGLE DUCT VAV REHEAT 70". * ~~~ * User-Specified Maximum Flow Fraction during Reheat of 0.50000 [] * ~~~ * differs from Design Size Maximum Flow Fraction during Reheat of 1.00000 [] * ~~~ * This may, or may not, indicate mismatched component sizes. * ~~~ * Verify that the value entered is intended and is consistent with other components.

I believe this is a problem with the hard set values I put in for my VAV w/reheat box and design heating airflow for the thermal zone. I have tried many different approaches including setting design air flow fraction to 0, but the error continues to persist. I'm still unsure which input is directly causing this error because I don't see anything specifically saying "Design Size Maximum Flow Fraction during Reheat" that I can set.

The two image below are my VAV w/reheat user inputted values and the thermal zones design heating parameters.

I'm sure someone can add a bit more detail to my answer. When you are in the HVAC module, go to your library, scroll down until you see the S's and you will see a list of setpoint options. Click the arrow on the left to bring up the setpoint manager. Add the setpoint manager you wish to place in the node that you want to place it in (like any other piece of equipment).

Hi aparker,

Thank you for taking the time to look at my .osm file. I looked at the .err file and indeed E+ 8.5.0 is running. I'm using OpenStudio 1.11.0 and Windows 7 just like you. Curious that it runs with your software.

I downloaded my .osm file and when I opened it, it popped up with an error for my weather file. I reloaded the weather file and it worked with the fatal errors. It's weird because I tried doing the exact same thing with the .osm file on my computer (delete it and reload it) but it didn't solve the problem. Seems like there was some kind of corruption with my original file

Macumber,

Yes, I have tried to reload another weather file and then tried reloading another weather file, neither of which are working. I downloaded the weather file from the energyplus.gov weather data and it does have latitude, longitude, time zone, and elevation in it.

To clarify, I got my weather file and design days files from the energyplus website. I have not altered these files at all.

Hello all,

I've been adding space types to my energy model and I've come across a confusing error. The severe errors I'm getting are:

* Severe * No Location given. Must have location information for simulation. * Warning * Did you realize that you have Latitude=0.0, Longitude=0.0 and TimeZone=0.0? Your building site is in the middle of the Atlantic Ocean. * Warning * Weather Environment(s) requested, but no weather file found * Severe * GetNextEnvironment: No location specified, program will terminate. * Fatal * Previous Conditions cause program termination.

I've made sure that my weather file and design days are specified in the model, but it seems like open studio is not reading this into the E+ simulation. My previous revision did not have this problem and the only thing I have updated since this revision was replacing the default ASHRAE space types with my own space types. This is confusing since I still have the same weather file and design days file loaded from the previous revision. I tried inputting a different weather and design days file, but these errors still keep appearing. I'm not sure what to make of this.

I've posted my .osm file below if anyone could take look, I've tried everything I thought of to fix this error:

https://www.dropbox.com/s/v3imat9pulk...

Thanks!

Thank you for your response Tom! Like you said, I am hesitant to do this troubleshooting in E+ since I cannot fix any errors in E+ and then re-import my idf file back into OS. I think Eric's solution is sufficient for my needs.

Thank you very much Eric for your response!

Hello all,

I'm currently trying to trouble shoot my energy model after seeing I have 1000s of unmet cooling and heating hours along with poor humidity control and ACH ventilation minimums not being met in the thermal zones.

How do I go about tracking a node (such as setpoint manager) so that I can track a parameter within this node (i.e. supply air temperature coming out an AHU)? Is this a separate measure I have to write to get these values?

Thanks!

David,

Thank you very much for your quick response! I'm assuming the 100% boiler what I should be using as the work around for hot water?

Hello all,

I ran across this fatal error when simulating my building.

Autosizing of heating coil UA failed for Coil:Heating:Water "COIL HEATING WATER 18"
  Bad starting values for UA
  Lower UA estimate = 9.292995 W/m2-K (0.1% of Design Coil Load)
  Upper UA estimate = 9292.995029 W/m2-K (100% of Design Coil Load)
  Zone "BASEMENT - TYPE 2B BIOPHYSICS LAB B0112" coil sizing conditions (may be different than Sizing inputs):
  Coil inlet air temperature = 12.800 C
  Coil inlet air humidity ratio = 8.000E-003 kgWater/kgDryAir
  Coil inlet air mass flow rate = 5.827590E-002 kg/s
  Design Coil Capacity = 3917.795 W
  Design Coil Load = 9292.995 W
  Inadequate water side capacity: in Plant Sizing for this hot water loop
  increase design loop exit temperature and/or decrease design loop delta T
  Plant Sizing object = HOT WATER LOOP
  Plant design loop exit temperature = 82.000 C
  Plant design loop delta T = 11.000 C

I am using the default 180F water exit temperature which goes to hot water reheat coils with inlet temp of 140F and outlet temp of 120F. I've tried playing around with the water exit temp of the boiler and the reheat VAV terminal with no luck.

Upon searching I found this post and an apparent fix for the problem here.

I've tried to understand what this fix has done, but I'm not entirely sure what I'm supposed to be doing. Has anyone ran into this problem and fixed this issue before?

Thanks!

Hello all,

The building I am modelling receives all of its chilled water and steam from an outside CHP plant. I am only interested in the energy consumption due to the building use and not the plant equipment. So far, the only work-around I have using is setting the boiler efficiency to 100% and using adiabatic piping. I've left all of the other options for plant equipment to the default settings.

Is there an option to do this in open studio or should I just keep my work around? Also, I'm not sure what a work around would be for the chilled water loop, if anyone has any ideas, please share them.

Thanks!

Thank you very much for your quick response. That's what I was suspecting about UFAD. I'll try your way and then add the RoomAirModelType to see how it changes the results.

I haven't written a measure for OS, so it may easier for me to go back and forth between OS and E+ for this. Each thermal zone (3 zones) are relatively big at 16,000 sqft, so this could have an impact to the results.

If do get enough time, I will try to write a measure for OS for others to use, but I don't thinking my coding abilities will be up to par :(

Hello all,

This is a follow up question to the previous question I had about modelling UFAD systems. I placed my supply and return plenums in my model based on some of the Energy Plus examples. I am now trying to figure out how to model the air side HVAC system in Open Studio, but I don't see anything in particular that will allow me to specify floor diffusers, thermostat height, etc...

Has anyone attempted to and successfully modeled an interior UFAD system in Open Studio? Since Open Studio does not transpose HVAC equipment from an imported Energy Plus IDF file, I cannot see how this would be implemented in Open Studio.

I understand how to model this system in the Energy Plus IDF editor, but I would like to model this air distribution system in the .osm file instead of exporting the .osm file into the IDF editor since I would not be able to return back to Open Studio (since it won't import HVAC equipment). Any help is much appreciated!

Jason

David,

Thank you very much for looking into this for me, works like a charm!

Jason

If anyone has anytime to look at the osm file, below is the dropbox link to the file:

https://www.dropbox.com/s/txcn4x97z4s...

So I went through all of the building surfaces in Open Studio software and I didn't see any of the ones giving me errors listed (I saw gaps in some of my zone surfaces where those missing surfaces would be in).

However, I do see all of these surfaces when I go to the Open Studio Inspector in Sketchup. When I search these surfaces in sketchup, nothing shows up in the model.

Edit: Just to clarify, I have only been working with this model in Sketchup and Open Studio, I have modified anything in the text editor for the OSM file.

Hello,

I'm trying to run my OS simulation but I'm getting a number of severe errors that is blocking me from finishing the run.

The errors are the following

SURFACE Field [Construction Name] is required but was blank SURFACE Field [Zone Name] is required but was blank

Both of these errors appear for twelve surfaces in my model. These twelve surfaces also have errors associated with them in the Sketchup model. The error in Sketchup is:

"The space referenced by this surface does not exist, it cannot be drawn."

I ran the OSM diagnostic script, with no luck in getting rid of these surfaces. I then went into the text editor to find these surfaces and delete them, but I could not find them in the text editor as well.

I'm not sure how to debug these errors at this point, but I cannot run my simulation either because of these errors. Please advise.

Jason

Helloo Bo,

Thank you very much for your response. It looks like I got some floor shifting to do in my model to put these plenums in!

Jason

Thank you for pointing me in the right direction!

Ok, thank you I will remember that for my next post :)

Hello,

I've searched and searched for an answer to my question, but I have not found anything related to this. I am using Sketchup 2016, Open Studio 1.11.0, and latest version of EnergyPlus The building I am modelling has underfloor ventilation systems (with supply diffusers) on the first, second, and third floor. When I am modelling the building shell and spaces, should I physically model the supply and return plenums associated with the Underfloor Ventilation System? Thanks in advance!