Hey good folks,
Question for all of you: I’m modeling building behavior at high temperatures and notice that where outdoor DB temperatures cross 50C the system cuts out.
Does this come from a known physical limitation of the VRF system? If so, does anyone have a citation? Other HVAC templates do not behave in a similar way, it seems specific to the VRF system. Any high-level explanation would be greatly appreciated.
Thanks for your help and Happy New Year!
Jon
50C outdoor temperature. Is your building in Death Valley?
I don’t know exactly what the setting is but I know that the VRF systems have lots of controls and I wouldn’t be surprised if one of them involves the system shutting off (or at least struggling with conflicting controls) when the outdoor temperature is that high. I would imagine that you can change it by editing the OSM manually or with the OpenStudio SDK if you knew which properties of the VRF were causing the shut-off.
If you want to ask the official source about this, these HVAC templates are all added via the openstudio-standards gem. Some of the maintainers of the standards gem check the UnmetHours forum. So you might try asking the question there to see if anyone has suggestions.
ahhh ~50c, the temperature threshold you know you’ve crossed when you can tell ‘I should go sit in the shade’ by the fluid in your eyeballs feeling too hot!