chiller:electric with heat recovery - temperatures too cold

asked 2025-02-23 22:12:06 -0500

SolanaH1's avatar

updated 2025-02-24 06:37:28 -0500

I am a student and am working on implementing a model with a water-cooled chiller:electric with heat recovery. I have a hot water loop, chilled water loop, condenser loop, and heat recovery loop and have been referencing the heatrecoverychillerelectric example file to input information for the chiller. After inputting all the information, I've come across two severe errors that seem related and forced the simulation to terminate. The first error is repeated 21,915 times.

1)

** Severe  ** FindRootSimpleController: Controller error for controller = "CONTROLLER HOT WATER COIL 3"
**   ~~~   **  Environment=RUN PERIOD 1, at Simulation time=01/01 00:00 - 00:10
**   ~~~   **   Controller function is inconsistent with user specified controller action = Normal action
**   ~~~   **   Actuator will be set to maximum action
**   ~~~   ** Controller control type=Temperature
**   ~~~   ** Controller temperature setpoint = 11.95 [C]
**   ~~~   ** Controller sensed temperature = -5.55 [C]
**   ~~~   ** Controller actuator mass flow rate set to 2.19 [kg/s]
**   ~~~   ** Controller actuator temperature = -22.82 [C]
**   ~~~   ** The entering hot water temperature (controller actuator temperature) should be above the setpoint temperature

2)

** Severe  ** Plant temperatures are getting far too cold, check controls and relative loads and capacities
**   ~~~   **  Environment=RUN PERIOD 1, at Simulation time=01/31 16:00 - 16:10
**   ~~~   ** PlantLoop Name (Supply Side) = HW LOOP
**   ~~~   ** PlantLoop Setpoint Temperature=60.0 {C}
**   ~~~   ** PlantLoop Inlet Node (LoopSideLocation::Supply) does not have a Setpoint.
**   ~~~   ** PlantLoop Inlet Node (LoopSideLocation::Demand) does not have a Setpoint.
**   ~~~   ** PlantLoop Outlet Node (LoopSideLocation::Supply) has a Setpoint.
**   ~~~   ** PlantLoop Outlet Node (LoopSideLocation::Demand) does not have a Setpoint.
**   ~~~   ** PlantLoop Outlet Node (SupplySide) "HW SUPPLY PUMP OUTLET NODE" has temperature=-138.1 {C}
**   ~~~   ** PlantLoop Minimum Temperature=37.8 {C}
**   ~~~   ** PlantLoop Maximum Temperature=65.6 {C}
**   ~~~   ** PlantLoop Flow Request (LoopSideLocation::Supply)=0.0 {kg/s}
**   ~~~   ** PlantLoop Flow Request (LoopSideLocation::Demand)=2.5 {kg/s}
**   ~~~   ** PlantLoop Node (SupplySide) "HW SUPPLY PUMP OUTLET NODE" has mass flow rate =2.5 {kg/s}
**   ~~~   ** PlantLoop PumpHeat (LoopSideLocation::Supply)=571.8 {W}
**   ~~~   ** PlantLoop PumpHeat (LoopSideLocation::Demand)=0.0 {W}
**   ~~~   ** PlantLoop Cooling Demand=0.0 {W}
**   ~~~   ** PlantLoop Heating Demand=777269.6 {W}
**   ~~~   ** PlantLoop Demand not Dispatched=0.0 {W}
**   ~~~   ** PlantLoop Unmet Demand=2077216.8 {W}
**   ~~~   ** PlantLoop Capacity=-99999.0 {W}
**   ~~~   ** PlantLoop Capacity (LoopSideLocation::Supply)=-99999.0 {W}
**   ~~~   ** PlantLoop Capacity (LoopSideLocation::Demand)=0.0 {W}
**   ~~~   ** PlantLoop Operation Scheme=HOT LOOP OPERATION
**   ~~~   ** PlantLoop Operation Dispatched Load = 777269.6 {W}
**   ~~~   ** PlantLoop Operation Dispatched Load (LoopSideLocation::Supply)= 777269.6 {W}
**   ~~~   ** PlantLoop Operation Dispatched Load (LoopSideLocation::Demand)= 0.0 {W}

I have tried looking through some of the relevant comments, but none of them have helped me fix the issue. I am autosizing most of the equipment, so I'm not sure if that could be causing this issue? I have also set maximum and minimum temperatures for my plant loops to try to maintain the temperatures, but that did not seem to fix the issue either. Do you have any advice on what could be causing this issue?

Thanks in advance!

edit retag flag offensive close merge delete