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Which side of the plant loop for Solar Collector in E+/OpenStudio?

asked 2017-11-09 04:30:45 -0600

I have to admit I'm slightly confused here, as I am seeing contradicting information on how to model solar collectors in EnergyPlus and OpenStudio.

On one hand, everything on EnergyPlus side seems to imply the solar collector must be on the demand side of the plant loop.

The solar collector must be connected on the demand side of the plant loop. Multiple collector modules can be combined in series and parallel using the normal plant connection rules. The supply side of the plant loop should contain a water heater with the solar collector loop connecting to the Source Side Inlet and Source Side Outlet nodes

  • The example files such as SolarCollectorFlatPlateWater.idf do implement it this way.

On the other hand, there are numerous questions about OpenStudio here that show the solar collector on the supply side, for example Active indirect solar hot water collector modeling and solar collector panel to DHW.

So I could see two explanations, which one is right?

  • The I/O reference guide and example files are outdated, and it is possible to put it on the supply side of the plant loop
  • OpenStudio is doing some "magic" in Forward translation, to create a plant loop where it's on the demand side (a cursory look at source files didn't reveal anything obvious...)
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Here's further evidence to support demand-side placement.

Eric Ringold gravatar imageEric Ringold ( 2017-11-09 10:24:48 -0600 )edit

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answered 2017-11-09 06:37:07 -0600

Avi gravatar image

In the model I am working on in OS the Collector is on the Plant's supply side and also in the in.idf after the forward translation the collector remains in the plant's supply side. if you need I can post pictures and code fragments.

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Asked: 2017-11-09 04:30:45 -0600

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Last updated: Nov 09