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Create Variable Speed RTU issue.

asked 2021-01-19 17:01:26 -0600

Biraj gravatar image

updated 2021-01-20 08:55:33 -0600

Hi there,

I used "Create Variable Speed RTU" in the form of Apply Measure and I got the message as shown in the screenshot (link below). I have tried to do this with constant fan system in all the zones as well as with no equipment assigned, in either case I got the same message. To be specific, I had initially applied "Add a PSZ-HP to each zone" and this had a DX heat pump system with constant volume fan and no reheat. When I tried to replace this system with "Create Variable Speed RTU" in all zones, I got the same message.

Here is the link to the screenshot: https://estesmcclure01-my.sharepoint....

I would appreciate any help on this.

Thank you, Biraj

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answered 2021-01-20 08:54:55 -0600

The lines under Standard Output: are errors that OpenStudio encounters when trying to translate your OSM into an EnergyPlus input file (IDF).

OpenStudio translation errors

These three lines say that an OS:SubSurface object (shade, window, etc.) named "Sub Surface 56" has more vertices or corners than EnergyPlus allows. Without seeing your model, I have two guesses as to what's causing this:

  • You have defined a shading group that contains many shade surfaces. To fix this, cut and paste some shade surfaces into new shading groups.
  • You have drawn a very complex subsurface with many vertices. To fix this, simplify the shape of the subsurface to have the same area with fewer vertices.

It is strange that applying this Create Variable Speed RTU measure that deals with HVAC is translating geometry. However, even if the measure wasn't doing this, you would very likely still encounter this translation issue when you simulated the OpenStudio model.

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Asked: 2021-01-19 17:01:26 -0600

Seen: 26 times

Last updated: Jan 20