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Plant Loop Operation Scheme in Open Studio

asked 2015-05-13 22:55:03 -0500

updated 2017-05-17 12:34:30 -0500

I am fairly new to Open Studio but know EnergyPlus pretty well. I have built a basic PTAC (system 1 LEED) in Open studio with hot water coils. What I don't understand is that when I run the simulation in Open Studio, my boiler plant loop won't turn on. When I export it to EnergyPlus I noticed that the operation scheme was set to PlantEquipmentOperation:ComponentSetpoint. I ran this and the plant loop wouldn't turn on, there was no flow through the boiler and consequently no heating in the entire model. I changed the operation scheme to PlantEquipmentOperation:HeatingLoad and the boiler and plant loop turned on and worked perfectly. My questions are a) is there a way to change the plant equipment operation in Open Studio? b) Is there a way I can make PlantEquipmentOperation:ComponentSetpoint work so that flow goes through the boiler?

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answered 2015-05-13 23:41:55 -0500

OpenStudio currently creates plant operation schemes automatically depending on where you have the setpoint managers on the loop. If you have them on the outlet nodes of the individual components (boilers, etc), you will get a PlantEquipmentOperation:ComponentSetpoint. If you have them on the supply outlet node, you will get a PlantEquipmentOperation:HeatingLoad or PlantEquipmentOperation:CoolingLoad depending on the types of equipment on the loop. The logic to create these is pretty "clever," so it would not surprise me if you hit an odd scenario where the automation is failing to do what you expect. Also, perhaps a tangent, but the Boiler has a field called "Boiler Flow Mode" that impacts when/how flow through the boiler happens.

In the future, we will likely expose the plant loop operation schemes to the user in more detail so that you don't need to understand the translator to know what's going on.

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Comments

Unmet hours to the rescue again! Thanks this worked a treat. Heating is now going on, phew!

Annie Marston gravatar imageAnnie Marston ( 2015-05-14 11:55:43 -0500 )edit

The future is here.

Kyle Benne gravatar imageKyle Benne ( 2016-01-22 09:34:05 -0500 )edit

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Asked: 2015-05-13 22:55:03 -0500

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Last updated: Jul 07 '15