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How to connect a ChillerAbsorption to a hot water loop?

asked 2018-04-22 01:25:53 -0500

TomB's avatar

How can I connect the Chiller:Absorption to a hot water loop? The OpenStudio ChillerAbsorbtion object has no handles for connecting the generator inlet and outlet nodes?

Can I do some sort of dummy object on a Hot Water Loop supply branch and switcharoo upon translation to energyplus?

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answered 2018-04-23 03:31:05 -0500

updated 2018-04-25 05:09:47 -0500

You found a problem in the API and I opened a GitHub issue here. You can find more details on why it's not working in said issue.

The bottom line is that this object is indeed missing tertiary node implementation and therefore cannot be connected to the generator nodes.

So you have two options:

  • Use a ChillerAbsorptionIndirect object. I strongly suggest you do that. The I/O ref is quite explicit here: ChillerAbsorptionIndirect is exactly the same as ChillerAbsorption but better, and ChillerAbsorption may get deprecated as a result... And the good thing is that ChillerAbsorptionIndirect does allow connecting the generator nodes.
  • Indeed create a hot water loop with a pkaceholder component on the demand side, and after FT you switch the component with the Chiller:Absorption and make sure you update the Branches etc (or you could also not use a component at all and completely add a new branch but that tends to be harder)
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The way I imagine using this is to supply hot water to the ChillerAbsorptionIndirect from a hot water loop - so I can do hot water supply from a Capstone. I was planning to put the Absorber on the demand side of a hot water loop. The e+ object is simple - it seems to allow a 'magic' heat source

TomB's avatar TomB  ( 2018-04-23 21:41:38 -0500 )edit

I wrote that quickly, see edit. You can place the Chiller on the demand side of the generator loop, that's not a problem. And if you use the pure OpenStudio way like I advise, you can add the ChillerAbsoprtionIndirect on the demand side of your genrator loop that without a problem too.

Julien Marrec's avatar Julien Marrec  ( 2018-04-25 05:11:03 -0500 )edit

I cannot make the Chiller:Absorption:Indirect work. Yes, I can pull it from the Library tab into my chilled water loop. Then I can also pull it from the My Model tab into my condenser water loop (this is exactly like a water-cooled Chiller:Electric:EIR works, too). However, when I then try to also pull it from the My Model tab into my hot water loop, it does show up there, but simultaneously disappears from the condenser water loop. So, to keep at least the condenser loop intact, I have to forgo the water loop. The simulation runs OK, but the generator shows up as district heating.

Matt Koch's avatar Matt Koch  ( 2018-10-18 17:54:47 -0500 )edit

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Asked: 2018-04-22 01:25:53 -0500

Seen: 250 times

Last updated: Apr 25 '18