[EnergyPlus_Support] plantloop fluid temperature too low

["shubou" <dingwenting@xxxxxxxxx>]

who can tell me how to solve the following problem?


I use outdoorunit+radiant floor for every air-conditioned zone and the plant is water to water heat pump.

The error is

Plant temperatures are getting far too cold, check controls and relative loads and capacities
   **   ~~~   **  Environment=TOKYO HYAKURI - JPN IWEC Data WMO#=477150, at Simulation time=05/01 13:05 - 13:10
   **   ~~~   ** PlantLoop Name (SupplySide)= COOLSYS1
   **   ~~~   ** PlantLoop Setpoint Temperature=6.7 {C}
   **   ~~~   ** PlantLoop Inlet Node (SupplySide) does not have a Setpoint.
   **   ~~~   ** PlantLoop Inlet Node (DemandSide) does not have a Setpoint.
   **   ~~~   ** PlantLoop Outlet Node (SupplySide) has a Setpoint.
   **   ~~~   ** PlantLoop Outlet Node (DemandSide) does not have a Setpoint.
   **   ~~~   ** PlantLoop Outlet Node (SupplySide) "COOLSYS1 SUPPLY OUTLET NODE" has temperature=-484.6 {C}
   **   ~~~   ** PlantLoop  Inlet Node (SupplySide) "COOLSYS1 SUPPLY INLET NODE" has temperature=7.4 {C}
   **   ~~~   ** PlantLoop Minimum Temperature=1.0 {C}
   **   ~~~   ** PlantLoop Maximum Temperature=98.0 {C}
   **   ~~~   ** PlantLoop Flow Request (SupplySide)=0.0 {kg/s}
   **   ~~~   ** PlantLoop Flow Request (DemandSide)=0.5 {kg/s}
   **   ~~~   ** PlantLoop Node (SupplySide) "COOLSYS1 SUPPLY OUTLET NODE" has mass flow rate =0.5 {kg/s}
   **   ~~~   ** PlantLoop PumpHeat (SupplySide)=126.4 {W}
   **   ~~~   ** PlantLoop PumpHeat (DemandSide)=0.0 {W}
   **   ~~~   ** PlantLoop Cooling Demand=1683.1 {W}
   **   ~~~   ** PlantLoop Heating Demand=0.0 {W}
   **   ~~~   ** PlantLoop Demand not Dispatched=0.0 {W}
   **   ~~~   ** PlantLoop Unmet Demand=1138411.7 {W}
   **   ~~~   ** PlantLoop Capacity=1800000.0 {W}
   **   ~~~   ** PlantLoop Capacity (SupplySide)=1800000.0 {W}
   **   ~~~   ** PlantLoop Capacity (DemandSide)=0.0 {W}
   **   ~~~   ** PlantLoop Operation Scheme=COOLSYS1 LOOP OPERATION SCHEME LIST
   **   ~~~   ** PlantLoop Operation Dispatched Load = 1683.1 {W}
   **   ~~~   ** PlantLoop Operation Dispatched Load (SupplySide)= 1683.1 {W}
   **   ~~~   ** PlantLoop Operation Dispatched Load (DemandSide)= 0.0 {W}
   **   ~~~   ** Branches on the Loop.
   **   ~~~   ** Demand Branches:
   **   ~~~   **   COOLSYS1 DEMAND INLET BRANCH
   **   ~~~   **     Components on Branch:
   **   ~~~   **       PIPE:ADIABATIC:COOLSYS1 DEMAND INLET PIPE
   **   ~~~   **   COOLSYS1 DEMAND LOAD BRANCH 1
   **   ~~~   **     Components on Branch:
   **   ~~~   **       ZONEHVAC:LOWTEMPERATURERADIANT:VARIABLEFLOW:PW RADIANT FLOOR
   **   ~~~   **   COOLSYS1 DEMAND LOAD BRANCH 2
   **   ~~~   **     Components on Branch:
   **   ~~~   **       ZONEHVAC:LOWTEMPERATURERADIANT:VARIABLEFLOW:INT RADIANT FLOOR
   **   ~~~   **   COOLSYS1 DEMAND LOAD BRANCH 3
   **   ~~~   **     Components on Branch:
   **   ~~~   **       ZONEHVAC:LOWTEMPERATURERADIANT:VARIABLEFLOW:PW-MID RADIANT FLOOR
   **   ~~~   **   COOLSYS1 DEMAND LOAD BRANCH 4
   **   ~~~   **     Components on Branch:
   **   ~~~   **       ZONEHVAC:LOWTEMPERATURERADIANT:VARIABLEFLOW:INT-MID RADIANT FLOOR
   **   ~~~   **   COOLSYS1 DEMAND LOAD BRANCH 5
   **   ~~~   **     Components on Branch:
   **   ~~~   **       ZONEHVAC:LOWTEMPERATURERADIANT:VARIABLEFLOW:PW-TOP RADIANT FLOOR
   **   ~~~   **   COOLSYS1 DEMAND LOAD BRANCH 6
   **   ~~~   **     Components on Branch:
   **   ~~~   **       ZONEHVAC:LOWTEMPERATURERADIANT:VARIABLEFLOW:INT-TOP RADIANT FLOOR
   **   ~~~   **   COOLSYS1 DEMAND LOAD BRANCH 7
   **   ~~~   **     Components on Branch:
   **   ~~~   **       COIL:COOLING:WATER:PWCOOLINGCOIL
   **   ~~~   **   COOLSYS1 DEMAND LOAD BRANCH 8
   **   ~~~   **     Components on Branch:
   **   ~~~   **       COIL:COOLING:WATER:INTCOOLINGCOIL
   **   ~~~   **   COOLSYS1 DEMAND LOAD BRANCH 9
   **   ~~~   **     Components on Branch:
   **   ~~~   **       COIL:COOLING:WATER:PW-MIDCOOLINGCOIL
   **   ~~~   **   COOLSYS1 DEMAND LOAD BRANCH 10
   **   ~~~   **     Components on Branch:
   **   ~~~   **       COIL:COOLING:WATER:INT-MIDCOOLINGCOIL
   **   ~~~   **   COOLSYS1 DEMAND LOAD BRANCH 11
   **   ~~~   **     Components on Branch:
   **   ~~~   **       COIL:COOLING:WATER:PW-TOPCOOLINGCOIL
   **   ~~~   **   COOLSYS1 DEMAND LOAD BRANCH 12
   **   ~~~   **     Components on Branch:
   **   ~~~   **       COIL:COOLING:WATER:INT-TOPCOOLINGCOIL
   **   ~~~   **   COOLSYS1 DEMAND BYPASS BRANCH
   **   ~~~   **     Components on Branch:
   **   ~~~   **       PIPE:ADIABATIC:COOLSYS1 DEMAND BYPASS PIPE
   **   ~~~   **   COOLSYS1 DEMAND OUTLET BRANCH
   **   ~~~   **     Components on Branch:
   **   ~~~   **       PIPE:ADIABATIC:COOLSYS1 DEMAND OUTLET PIPE
   **   ~~~   ** Supply Branches:
   **   ~~~   **   COOLSYS1 SUPPLY INLET BRANCH
   **   ~~~   **     Components on Branch:
   **   ~~~   **       PUMP:VARIABLESPEED:COOLSYS1 PUMP
   **   ~~~   **   COOLSYS1 SUPPLY EQUIPMENT BRANCH 1
   **   ~~~   **     Components on Branch:
   **   ~~~   **       HEATPUMP:WATERTOWATER:EQUATIONFIT:COOLING:GSHPCLG1
   **   ~~~   **   COOLSYS1 SUPPLY EQUIPMENT BRANCH 2
   **   ~~~   **     Components on Branch:
   **   ~~~   **       HEATPUMP:WATERTOWATER:EQUATIONFIT:COOLING:GSHPCLG2
   **   ~~~   **   COOLSYS1 SUPPLY EQUIPMENT BYPASS BRANCH
   **   ~~~   **     Components on Branch:
   **   ~~~   **       PIPE:ADIABATIC:COOLSYS1 SUPPLY EQUIPMENT BYPASS PIPE
   **   ~~~   **   COOLSYS1 SUPPLY OUTLET BRANCH
   **   ~~~   **     Components on Branch:
   **   ~~~   **       PIPE:ADIABATIC:COOLSYS1 SUPPLY OUTLET PIPE 






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