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Why does my simulation terminates in the middle of simulation (7h month))

asked 2020-12-08 16:27:16 -0500

Farzam gravatar image

updated 2020-12-08 18:08:47 -0500

Hi everyone,

I am having the following error. What should I do to solve it? I am a newbie so I would really really appreciate solutions based on components in E+.

  ** Severe  ** Plant temperatures are getting far too hot, check controls and relative loads and capacities
   **   ~~~   **  Environment=RUN PERIOD 1, at Simulation time=09/15 16:50 - 17:00
   **   ~~~   ** PlantLoop Name (DemandSide)= HOT WATER LOOP
   **   ~~~   ** PlantLoop Setpoint Temperature=60.0 {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 (DemandSide) "NODE 20" has temperature=300.0 {C}
   **   ~~~   ** PlantLoop Inlet Node (DemandSide) "NODE 19" has temperature=300.0 {C}
   **   ~~~   ** PlantLoop Minimum Temperature=0.0 {C}
   **   ~~~   ** PlantLoop Maximum Temperature=100.0 {C}
   **   ~~~   ** PlantLoop Flow Request (SupplySide)=2.3 {kg/s}
   **   ~~~   ** PlantLoop Flow Request (DemandSide)=1.1E-006 {kg/s}
   **   ~~~   ** PlantLoop Node (DemandSide) "NODE 20" has mass flow rate =2.3 {kg/s}
   **   ~~~   ** PlantLoop PumpHeat (SupplySide)=537.4 {W}
   **   ~~~   ** PlantLoop PumpHeat (DemandSide)=0.0 {W}
   **   ~~~   ** PlantLoop Cooling Demand=2380093.2 {W}
   **   ~~~   ** PlantLoop Heating Demand=0.0 {W}
   **   ~~~   ** PlantLoop Demand not Dispatched=0.0 {W}
   **   ~~~   ** PlantLoop Unmet Demand=-2380093.2 {W}
   **   ~~~   ** PlantLoop Capacity=151647.2 {W}
   **   ~~~   ** PlantLoop Capacity (SupplySide)=151647.2 {W}
   **   ~~~   ** PlantLoop Capacity (DemandSide)=0.0 {W}
   **   ~~~   ** PlantLoop Operation Scheme=HOT WATER LOOP OPERATION SCHEMES
   **   ~~~   ** PlantLoop Operation Dispatched Load = 0.0 {W}
   **   ~~~   ** PlantLoop Operation Dispatched Load (SupplySide)= 0.0 {W}
   **   ~~~   ** PlantLoop Operation Dispatched Load (DemandSide)= 0.0 {W}
   **   ~~~   ** Branches on the Loop.
   **   ~~~   ** Demand Branches:
   **   ~~~   **   HOT WATER LOOP DEMAND INLET BRANCH
   **   ~~~   **     Components on Branch:
   **   ~~~   **       PIPE:ADIABATIC:HOT WATER LOOP DEMAND INLET PIPE
   **   ~~~   **   HOT WATER LOOP DEMAND BRANCH 1
   **   ~~~   **     Components on Branch:
   **   ~~~   **       ZONEHVAC:BASEBOARD:CONVECTIVE:WATER:ZONE HVAC BASEBOARD CONVECTIVE WATER 1
   **   ~~~   **   HOT WATER LOOP DEMAND BRANCH 2
   **   ~~~   **     Components on Branch:
   **   ~~~   **       ZONEHVAC:BASEBOARD:CONVECTIVE:WATER:ZONE HVAC BASEBOARD CONVECTIVE WATER 2
   **   ~~~   **   HOT WATER LOOP DEMAND BRANCH 3
   **   ~~~   **     Components on Branch:
   **   ~~~   **       ZONEHVAC:BASEBOARD:CONVECTIVE:WATER:ZONE HVAC BASEBOARD CONVECTIVE WATER 3
   **   ~~~   **   HOT WATER LOOP DEMAND BRANCH 4
   **   ~~~   **     Components on Branch:
   **   ~~~   **       ZONEHVAC:BASEBOARD:CONVECTIVE:WATER:ZONE HVAC BASEBOARD CONVECTIVE WATER 4
   **   ~~~   **   HOT WATER LOOP DEMAND BRANCH 5
   **   ~~~   **     Components on Branch:
   **   ~~~   **       ZONEHVAC:BASEBOARD:CONVECTIVE:WATER:ZONE HVAC BASEBOARD CONVECTIVE WATER 5
   **   ~~~   **   HOT WATER LOOP DEMAND BRANCH 6
   **   ~~~   **     Components on Branch:
   **   ~~~   **       ZONEHVAC:BASEBOARD:CONVECTIVE:WATER:ZONE HVAC BASEBOARD CONVECTIVE WATER 6
   **   ~~~   **   HOT WATER LOOP DEMAND BRANCH 7
   **   ~~~   **     Components on Branch:
   **   ~~~   **       ZONEHVAC:BASEBOARD:CONVECTIVE:WATER:ZONE HVAC BASEBOARD CONVECTIVE WATER 7
   **   ~~~   **   HOT WATER LOOP DEMAND BRANCH 8
   **   ~~~   **     Components on Branch:
   **   ~~~   **       ZONEHVAC:BASEBOARD:CONVECTIVE:WATER:ZONE HVAC BASEBOARD CONVECTIVE WATER 8
   **   ~~~   **   HOT WATER LOOP DEMAND BRANCH 9
   **   ~~~   **     Components on Branch:
   **   ~~~   **       ZONEHVAC:BASEBOARD:CONVECTIVE:WATER:ZONE HVAC BASEBOARD CONVECTIVE WATER 9
   **   ~~~   **   HOT WATER LOOP DEMAND BRANCH 10
   **   ~~~   **     Components on Branch:
   **   ~~~   **       ZONEHVAC:BASEBOARD:CONVECTIVE:WATER:ZONE HVAC BASEBOARD CONVECTIVE WATER 10
   **   ~~~   **   HOT WATER LOOP DEMAND BRANCH 11
   **   ~~~   **     Components on Branch:
   **   ~~~   **       ZONEHVAC:BASEBOARD:CONVECTIVE:WATER:ZONE HVAC BASEBOARD CONVECTIVE WATER 11
   **   ~~~   **   HOT WATER LOOP DEMAND BRANCH 12
   **   ~~~   **     Components on Branch:
   **   ~~~   **       ZONEHVAC:BASEBOARD:CONVECTIVE:WATER:ZONE HVAC ...
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answered 2020-12-09 02:11:40 -0500

Given that it seems to be a Heating Loop serving baseboard, and that you have a PUMP:CONSTANTSPEED:PUMP CONSTANT SPEED 1, and that it gets too hot in the summer, my guess is that it is likely caused by pump heat building up over time indeed.

I can offer two leads:

  • Switch the Pump:ConstantSpeed Control Type from Continous (I'm guessing it's the current control type) to Intermittent. Read the I/O ref for this specific field, which does mention pump heat buildup too: https://bigladdersoftware.com/epx/doc...

  • Use an AvailabilityManager to switch off your PlantLoop in the summer months when no heat is required.

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Asked: 2020-12-08 16:27:16 -0500

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Last updated: Dec 09 '20