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Workaround for Fatal Pump Error in CBECC-Com v3c

asked 2015-08-14 15:10:32 -0500

updated 2015-09-22 07:57:23 -0500

I'm getting the following fatal error in EP after running a v3 CBECC-Com model (generated from IES VE) in v3c.

**  Fatal  ** ManagePumps: Invalid PumpIndex passed=3, Pump name={2F8F93D1-99C6-4687-8A38-3D2977F628F6}, stored Pump Name for that index=PUMP HWCP-1

It appears that the Pump object Name field is being replaced with a UUID from a Node causing a fatal error in EP here (see => below).

  {6f91d1f9-8020-4396-a564-5b2f208c7497}, !- Handle
  => {2f8f93d1-99c6-4687-8a38-3d2977f628f6}, !- Name
  {b38eb438-d964-42a4-8929-ed73d3aef2d7}, !- Inlet Node Name
  {7b03fee8-03ef-458c-b3ed-f4b587a2cdd0}, !- Outlet Node Name
  ,                                       !- Rated Flow Rate {m3/s}
  0,                                      !- Rated Pump Head {Pa}
  ,                                       !- Rated Power Consumption {W}
  ,                                       !- Motor Efficiency
  ,                                       !- Fraction of Motor Inefficiencies to Fluid Stream
  ,                                       !- Coefficient 1 of the Part Load Performance Curve
  ,                                       !- Coefficient 2 of the Part Load Performance Curve
  ,                                       !- Coefficient 3 of the Part Load Performance Curve
  ,                                       !- Coefficient 4 of the Part Load Performance Curve
  ,                                       !- Minimum Flow Rate {m3/s}
  Intermittent;                           !- Pump Control Type

  {cc6db6d4-1301-4fcb-a556-d38086c9bd58}, !- Handle
  => {2f8f93d1-99c6-4687-8a38-3d2977f628f6} Outlet Node, !- Name
  {7b03fee8-03ef-458c-b3ed-f4b587a2cdd0}, !- Inlet Port
  {1cc159bd-0dcc-477b-a250-4a313c9b8468}; !- Outlet Port


User-defined SHW Pump

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OSM Showing Pump Added by User

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OSM Showing Pump added by CBECC-Com v3c

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Have you got an XML file to share? Or an adjusted one if there are details that can't be shared? Is this a pump in the baseline or proposed? What does the pump serve?

pflaumingo gravatar imagepflaumingo ( 2015-08-14 15:52:09 -0500 )edit

@pflaumingo updated with link to XML. I deleted the offending pump and am running it again to see if it's more of a soft bug.

MatthewSteen gravatar imageMatthewSteen ( 2015-08-14 16:15:08 -0500 )edit

Is it a SHW pump?

pflaumingo gravatar imagepflaumingo ( 2015-08-14 16:21:27 -0500 )edit

Yes in the proposed ap model. Perhaps I'm breaking a T24 rule?

MatthewSteen gravatar imageMatthewSteen ( 2015-08-14 16:37:36 -0500 )edit

For a properly defined/working model, the only pump that should have a UID name is circulation pump on SHW loops. If you can't post the file here, I recommend submitting this as a CBECC-Com issue for further review.

DavidReddy gravatar imageDavidReddy ( 2015-08-14 16:38:21 -0500 )edit

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answered 2015-08-17 13:03:29 -0500

Sorry, missed that there was an XML file posted with the question when I first looked at this...

The SDD->OS translator failure is occurring because you have a pump defined in your SHW systems. CBECC-Com does not yet support modeling reciric SHW systems serving nonresidential spaces, so these systems should be modeled without a pump defined. The SDD->OS translator automatically creates the pump needed for simulation in EnergyPlus.

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Thanks @DavidReddy, I just figured this out. This seems like a bug to me or at the least something that should be included in the rule file to trap the error and warn the user before they spend time running full EP sims (1.5 hrs for this model). Is this documented anywhere?

MatthewSteen gravatar imageMatthewSteen ( 2015-08-17 13:35:47 -0500 )edit

Unfortunately, I don't develop the help documentation, so I am not sure if this is documented in the CBECC-Com help, but I agree that is should be caught by rules so I created a ticket for it in our system.

DavidReddy gravatar imageDavidReddy ( 2015-08-21 19:40:25 -0500 )edit

I also should add... CBECC-Com support through Unmet Hours is not currently funded since the CEC funds support through their own channel. Perfectly fine (and encouraged) to circulate CBECC-Com questions/issues/work-arounds on this forum, but best to also submit a ticket for issues like this through that system to make sure they get tracked and resolved.

DavidReddy gravatar imageDavidReddy ( 2015-08-21 19:51:36 -0500 )edit

@DavidReddy this reminds me. Seems like we should give that generated pump a better name.

Kyle Benne gravatar imageKyle Benne ( 2015-09-23 19:48:50 -0500 )edit

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Asked: 2015-08-14 15:10:32 -0500

Seen: 152 times

Last updated: Sep 22 '15