Issue overview

Only difference between working and failing variations of the IDF is the Sizing:System object type's Central Cooling Design Supply Air Temperature field was lowered from 90F to 70F. Perhaps the entering coil air temperature on the design day is <90F, so for the cooling coil to deliver 90F would yield a negative coil capacity. If that's the case, we would recommend updating EnergyPlus source code to throw a severe error in this situation that stops the run and says "On design day, cooling coil entering air temperature is less than design outlet air temperature. This will yield negative coil capacity sizing."

A change between v23 and v25 that coincidentally fixes the problem is basically a short-circuit at the top of DXCoils::CalcCBF that immediately exists if volume flow rate or total capacity are less than zero or zero.
The underlying cause in v23 that makes air flow rate 0 hasn't been solved in 25.1 - it's an earlier psychrometric calculation of enthalpy from supply temp that eventually yields a negative cooling capacity, which is subsequently zeroed because it's negative.

Operating System (Multiple choices)

Windows

Operating System Version

10

Version of EnergyPlus

23.1

Unmethours link or helpdesk ticket number

N/A

Defect file

No response