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that is great to know! thanks for the clarification Aaron!

Thanks Ag, you said - "It is worth to note both values do not directly affect simulations results in term of temperatur

Rated Supply Fan Power Per Volume Flow Rate What is "Rated Supply Fan Power Per Volume Flow Rate" it is in the openstudi

Rated Supply Fan Power Per Volume Flow Rate What is "Rated Supply Fan Power Per Volume Flow Rate" it is in the openstudi

Rated Supply Fan Power Per Volume Flow Rate What is "Rated Supply Fan Power Per Volume Flow Rate" it is in the openstudi

If you want it to mimic a VAV box, you could set the fan power of the terminal to zero. You will have to be careful thou

If you want it to mimic a VAV box, you could set the fan power of the terminal to zero.

I am not sure if you can add DX directly to a VAV box in EnergyPlus, but you could add a ZoneHVAC:WaterToAirHeatPump, wh

Can you use a single DOAS ERV Airloop and add a ZoneHVAC:PackagedTerminalHeatPump to each zone? The DOAS could be used f

Are you serving multiple zones with both air loops? If you are just serving one zone you might be able to use one of the

That is odd. Are you looking at the .epw weather file or the .ddy design day file? The design day file should be used to

@JulienMarrec I have placed the IDF and CSV in the link below. I had this model running with a smaller load. As soon as

Energy Plus LoadProfile:Plant from Schedule:File issues I am creating load profiles for a plant model using an 8760 csv

Energy Plus LoadProfile:Plant from Schedule:File issues I am creating load profiles for a plant model using an 8760 csv

Energy Plus LoadProfile:Plant from Schedule:File issues I am creating load profiles for a plant model using an 8760 csv

Energy Plus LoadProfile:Plant from Schedule:File issues I am creating load profiles for a plant model using an 8760 csv

this is great. thank you! Although I had to flip your if statement to get it to work space_hash = [] model.getSpaces.ea

Decoupled Cooling With Economizer Option OpenStudio I would like to test a building option which uses chilled beams, but

Hi Liam, I have notice this problem as well. From my experience, the reheat coils are sized to heat only the air require

I figured out the issue. I was deleting a cooling coil from the text editor without deleting the associated inlet and ou

Now I am getting the same error when I run a measure to add VAV boxes and reheat for multiple zones. This measure worked

OS Crashes When Opening Hydronic Loop Every time I open the hot water loop in my model it crashes. Any ideas as to why t

I figured out the issue. I was deleting a cooling coil from the text editor without deleting the associated inlet and ou

I am using version 2.1. What information about the history of the model will be helpful?

OS Crashes When Opening Hydronic Loop Every time I open the hot water loop in my model it crashes. Any ideas as to why t

I have been using DB browser to query EnergyPlus inputs and outputs for information. However, I can't seem to find glazing SHGC and visible transmittance included anywhere. It is shown in the output HTML table, so I assume it is included somewhere in the SQL file. Can anyone point me to the table which includes this information in the SQL file?

I am trying to model a chiller plant for a building with heat recovery chillers and air cooled chiller. The heat recovery chillers (water to water heat pumps in OS) need to turn on first on the cooling side but regulate to the heating demand.

In Summer months when more cooling is required the hot water loop overheats from the heat recovery chiller dumping too much heat into the loop. Error is shown below. Does anyone have a suggested work around to this issue?

   **  Fatal  ** CheckForRunawayPlantTemps: Simulation terminated because of run away plant temperatures, too hot
   ...Summary of Errors that led to program termination:
   ..... Reference severe error count=1
   ..... Last severe error=Plant temperatures are getting far too hot, check controls and relative loads and capacities

Thank you for the feed back. I guess the work around is providing a dummy load in the space on the heating design day. Is there no way to include a minimum ventilation reheat load on the heating design day?

I am having a problem with heating unmet hours on a VAV system that appears to be an issue with the reheat coil. The problem only occurs in internal zones where the heating load on the coil is due to reheat only. On exterior spaces where there is envelope load there is not problem. The issue is most obvious in large spaces where ACH are high compared to internal loads. The VAV box is supplying air near 55F and not reheating to meet the temperature setpoint. It appear that the coil is not being sized for the reheat load and only for whatever exterior load exists which is none.

Here is my sizing:zone object C:\fakepath\Capture.PNG

Here is my sizing:system object C:\fakepath\Capture1.PNG

The loop set up is simple with a HW loop operating at 130F with a 40F delta T serving the air loop.

Does anyone have insight into why the coil is being sized incorrectly and I am seeing unmet hours?

I want to run the OSM diagnostics to remove some very degenerate surfaces. I've done this before and usually the script saves a new file called "filename_diagnostics.osm" after running. The last few times I've tried it does save anything after running. Any ideas on how I can get it to resave the file again so I can use the changes it makes? Thank you!