How to prevent Energy Plus Heat-Only Fan Coil Heating Coil from operating during call for cooling

asked 2018-04-24 19:28:19 -0500

Molly Curtz gravatar image

I have a model with some heat-only fan coil units with electric heating coils. I have scheduled OFF for all hours the availability of the cooling coil, and have set the fan coil unit "maximum cold water flow rate" at zero to prevent cooling.

Results show that when the zone served gets hot, the electric heating coil is operating, exasperating the zone overheating.

It seems that I can use an availability schedule to try to make the heating coil unavailable during the summer, but is there another setting in the fan coil input that I should change to fix this? It seems like the problem shouldn't require availability schedules to solve. Thanks for any suggestions. image description

Here are the input objects for the Fancoil:

          ZoneHVAC:EquipmentList,
        L04Fire422:L04Fire422 Equipment,  !- Name
        ZoneHVAC:FourPipeFanCoil,!- Zone Equipment 1 Object Type
        L04Fire422:L04Fire422 WH403 Fan Coil Unit,  !- Zone Equipment 1 Name
        1,                       !- Zone Equipment 1 Cooling Priority
        1;                       !- Zone Equipment 1 Heating Priority

      ZoneHVAC:FourPipeFanCoil,
        L04Fire422:L04Fire422 WH403 Fan Coil Unit,  !- Name
        ,                        !- Availability Schedule Name
        CyclingFan,              !- Capacity Control Method
        Autosize,                !- Maximum Supply Air Flow Rate {m3/s}
        0.33,                    !- Low Speed Supply Air Flow Ratio
        0.66,                    !- Medium Speed Supply Air Flow Ratio
        0,                !- Maximum Outdoor Air Flow Rate {m3/s}
        ,                        !- Outside Air Schedule Name
        L04Fire422:L04Fire422 FCU Inlet Node,  !- Air Inlet Node Name
        L04Fire422:L04Fire422 FCU Outlet Node,   !- Air Outlet Node Name
        OutdoorAir:Mixer,        !- Outdoor Air Mixer Object Type
        L04Fire422:L04Fire422 FCU OA Mixer,  !- Outdoor Air Mixer Name
        Fan:OnOff,               !- Supply Air Fan Object Type
        L04Fire422:L04Fire422 FCU Fan,  !- Fan Name
        Coil:Cooling:Water,      !- Cooling Coil Object Type
        L04Fire422:L04Fire422 FCU Cooling Coil,  !- Cooling Coil Name
        0, !no cooling           !- Maximum Cold Water Flow Rate {m3/s}
        0.0,                     !- Minimum Cold Water Flow Rate {m3/s}
        0.001,                   !- Cooling Convergence Tolerance
        Coil:Heating:Electric,      !- Heating Coil Object Type
        L04Fire422:L04Fire422 FCU Heating Coil,  !- Heating Coil Name
        Autosize,                !- Maximum Hot Water Flow Rate {m3/s}
        0.0,                     !- Minimum Hot Water Flow Rate {m3/s}
        0.001;                   !- Heating Convergence Tolerance

      OutdoorAir:Mixer,
        L04Fire422:L04Fire422 FCU OA Mixer,  !- Name
        L04Fire422:L04Fire422 FCU Mixer Outlet Node,  !- Mixed Air Node Name
        L04Fire422:L04Fire422 FCU Mixer OA Node,  !- Outdoor Air Stream Node Name
        L04Fire422:L04Fire422 FCU Mixer Relief Node,  !- Relief Air Stream Node Name
        L04Fire422:L04Fire422 FCU Inlet Node;  !- Return Air Stream Node Name

      OutdoorAir:Node,
        L04Fire422:L04Fire422 FCU Mixer OA Node;  !- Name

      Fan:OnOff,
        L04Fire422:L04Fire422 FCU Fan,  !- Name
        Always 1,  !- Availability Schedule Name
        1,          !- Fan Efficiency
        91.292019454913,         !- Pressure Rise {Pa}
        Autosize,                !- Maximum Flow Rate {m3/s}
        0.7,                     !- Motor Efficiency
        1.0,                     !- Motor In Airstream Fraction
        L04Fire422:L04Fire422 FCU Mixer Outlet Node,  !- Air Inlet Node Name
        L04Fire422:L04Fire422 FCU Fan Outlet Node;  !- Air Outlet Node Name

      Coil:Cooling:Water,
        L04Fire422:L04Fire422 FCU Cooling Coil,  !- Name
        Always 0,                        !- Availability Schedule Name
        Autosize,                !- Design Water Flow Rate {m3/s}
        Autosize,                !- Design Air Flow Rate {m3/s}
        Autosize,                !- Design Inlet Water Temperature {C}
        Autosize,                !- Design Inlet Air Temperature {C}
        Autosize,                !- Design Outlet Air Temperature {C}
        Autosize,                !- Design Inlet Air Humidity ...
(more)
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Comments

Are you mean air temperature or operative temperature for zone control thermosats ?

Lefort-Antoine gravatar image Lefort-Antoine  ( 2019-08-05 09:37:08 -0500 )edit