Sefaira Web Application Error

I am consistently getting an error when using the Sefaira Web Application when I try to model VRF Fan Coil Systems. The error reads “An Error was encountered but no err file was produced: failed executing eplus energy analysis run.” The model gets stuck updated and will never produce results. Using the exact same geometry, if I switch HVAC system type to something like PTHP or really anything else then the model updates and produces results. Any idea why this is happening and what can be done to resolve the issue?

This doesn’t appear to be an issue with just VRF systems, I am also receiving the same error with other (but not all) system type; such as WSHP with and without geothermal turned on. This issue also persists with multiple geometries so it doesn’t appear to be an issue with the models or how they were built. Until this issue can get resolved the Sefaira Web Application is unusable, any idea when this will be resolved?

Hi @matt6,

I am just seeing this message. Are you still receiving those errors?

Out of curiosity what weather location are you using? Are you uploading your own .epw for this project?

Those are some of my initial questions but yeah if you are still experiencing these issues then I’d like to dig a little bit deeper to see if I can solve the issue for you.

Yes, I am still receiving theses errors. I have not uploaded my own weather files but I have this issue regardless of location. It doesn’t appear to just be limited to HVAC system type, I’ve also had the error with trying to run natural ventilation.

Hi @matt6, would you mind sharing the SketchUp model here for us to take a look at. More often than not it is usually the way things are modeled that can cause the analysis to fail, so I’d like to rule that out first.

I’ve had issues with this model when trying to model geo heat exchange and/or natural ventilation. Highlands Concept D1_Sefaira.skp (4.1 MB)

Thanks for sharing the model here, @matt6. Let me take a look and see what might be going on. I’ll reach back out when I find out more.

HI @matt6, really well modeled. Thanks for sharing that file with me. I uploaded the model to a fresh project after hiding the image in the model. And the analysis ran fine on my end. Project address here: https://apps.sefaira.com/page/project/311324

I tried running the WSHP (with and without the ground heat exchanger) along with natural ventilation turned on. One thing that I want to confirm with you is whether you have the zoning set to “One zone per room”? for your analysis. It looks like you already have the zones drawn in, in your SketchUp model and therefore I set the Zoning to “One zone per room” in my analysis.

On a separate note, in case you don’t know already, you do not have to model the vertical interior walls if you are only looking to run Energy analysis on your model. Simply drawing the lines on the floor plate will tell Sefaira to extrude the interior walls for your analysis.

Either way, please take a look at the project through the link that I shared, make any edits to the inputs and let me know if issues arise. I will be sure to dive deeper to see what might be going on.