Heating report value NaN problem due to exhaust fired absorption chillerheater model floating point errors

[jcyuan2020]

Issue overview

It was reported in the defect file that the energy usage reporting tables got NaN values all the way.

The root cause is identified for this problem. It is due to the floating point error when the chiller heater does not have sufficient heating capacity, for example, in case of hot summer days when the full cooling capacity is demanded for the chillerheater.

Currently there is no walk-around for this problem. Code modifications are need to handle the float error case in order to fix.

Details

Some additional details for this issue (if relevant):

• Platform (Operating system, version): All
• Version of EnergyPlus (if using an intermediate build, include SHA) V9.4, V9.5 pre-release, probably all earlier versions
• Helpdesk ticket number 15668

Checklist

Add to this list or remove from it as applicable. This is a simple templated set of guidelines.

• Defect file added in EnergyPlusDevSupport/DefectFiles
• Ticket added to Pivotal for defect (development team task)
• Pull request created (the pull request will have additional tasks related to reviewing changes that fix this defect)