Cooling limit capacity exceeded (with ZoneHVAC:IdealLoadsAirSystem object)

cecile-accenta commented 1 year ago

Issue overview

I tried to put a cooling limit capacity to the object ZoneHVAC:IdealLoadsAirSystem on the idf input file but in the results the limit seems to be exceeded. I had no problem with the heating capacity limit. The ZoneHVAC:IdealLoadsAirSystem is defined as:

ZoneHVAC:IdealLoadsAirSystem,
    ZONE+00_+01_+00 Ideal Loads,    !- Name
    ,                         !- Availability Schedule Name
    ZONE+00_+01_+00 In Node,    !- Zone Supply Air Node Name
    ZONE+00_+01_+00 Ex Node,    !- Zone Exhaust Air Node Name
    ,                         !- System Inlet Air Node Name
    50,                       !- Maximum Heating Supply Air Temperature
    13,                       !- Minimum Cooling Supply Air Temperature
    0.0156,                   !- Maximum Heating Supply Air Humidity Ratio
    0.0077,                   !- Minimum Cooling Supply Air Humidity Ratio
    LimitCapacity,            !- Heating Limit
    autosize,                 !- Maximum Heating Air Flow Rate
    100000,                   !- Maximum Sensible Heating Capacity
    LimitCapacity,            !- Cooling Limit
    autosize,                 !- Maximum Cooling Air Flow Rate
    60000,                    !- Maximum Total Cooling Capacity
    Heating Availability Schedule,    !- Heating Availability Schedule Name
    Cooling Availability Schedule,    !- Cooling Availability Schedule Name
    None,                     !- Dehumidification Control Type
    1,                        !- Cooling Sensible Heat Ratio
    None,                     !- Humidification Control Type
    ,                         !- Design Specification Outdoor Air Object Name
    ,                         !- Outdoor Air Inlet Node Name
    ,                         !- Demand Controlled Ventilation Type
    ,                         !- Outdoor Air Economizer Type
    ,                         !- Heat Recovery Type
    ,                         !- Sensible Heat Recovery Effectiveness
    ;                         !- Latent Heat Recovery Effectiveness

(Remark: the problem is increased when there is heat recovery)

The TDS gives these results:

Zoom in on a date with a peak above the limit:

Details

Energyplus python API
Version of EnergyPlus : 22.1.0
Unmethours link : https://unmethours.com/question/78354/cooling-limit-capacity-exceeded-with-zonehvacidealloadsairsystem-object/

Checklist

[ ] Defect file added (list location of defect file here)
[ ] 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)

cecile-accenta commented 1 year ago

IDF file : building_final_cold_limit_capacity.idf.txt
EPW file : eplusmtr.csv

Nigusse commented 1 year ago

@cecilecrol I ran your defect file with Miami, Florida weather and location using the latest code and I don't see the same problem. Below is a plot showing the results. The cooling rate capacity limit has not exceeded 60,000 W even though the controlled temperature set-point overshoot 24.C.

Please run the idf using EnergyPlus V22.2 and let us know if you are seeing the same problem.

Also please attached the weather file used to generate your results.

NREL / EnergyPlus