Error while modeling radiant underfloor cooling system
Hello guys! I'm a student in Technical University in Crete and I've been struggling a couple of weeks in a project, in which I would like to model a radiant floor cooling system using "Low Temperature Radiant Variable Flow" and I'm getting the following error warnings every time:
Error file results:
** Severe ** Hydronic radiant systems may Program Version,EnergyPlus, Version 9.0.1-bb7ca4f0da, YMD=2019.01.18 18:50,
************* Beginning Zone Sizing Calculations
** Warning ** ProcessScheduleInput: Schedule:Constant="ALWAYS ON DISCRETE", Blank Schedule Type Limits Name input -- will not be autosized without specification of nodes or schedules.
** ~~~ ** Occurs in ZoneHVAC:LowTemperatureRadiant:VariableFlow (heating input) = LOW TEMP RADIANT VAR FLOW
** Severe ** Hydronic radiant systems may validated.
** Warning ** ProcessScheduleInput: Schedule:Constant="ALWAYS OFF DISCRETE", Blank Schedule Type Limits Name input -- will not be autosized without specification validated.
** Warning ** ProcessScheduleInput: Schedule:Constant="ALWAYS ON CONTINUOUS", Blank Schedule Type Limits Name input -- will not be validated.
** Warning ** GetHTSurfaceData: Surfaces with interface to Ground found but no "Ground Temperatures" were input.
** ~~~ ** Found first in surface=SURFACE 16
** ~~~ ** Defaults, constant throughout the year of nodes (18.0) will be used.
** Warning ** CheckUsedConstructions: There are 1 nominally unused constructions in input.
** ~~~ ** For explicit details on each unused construction, use Output:Diagnostics,DisplayExtraWarnings;
** Warning ** Calculated design heating load for zone=THERMAL ZONE 4 is zero.
** ~~~ ** Check Sizing:Zone and ZoneControl:Thermostat inputs.
** Warning ** Calculated design heating load for zone=THERMAL ZONE 8 is zero.
** ~~~ ** Check Sizing:Zone and ZoneControl:Thermostat inputs.
************* Beginning Plant Sizing Calculations
** Warning ** GetElectricEIRChillerInput: Chiller:Electric:EIR="CHILLER - AIR COOLED"
** ~~~ ** Adding OutdoorAir:Node=CHILLER - AIR COOLED INLET NODE FOR CONDENSER
** Warning ** GetElectricEIRChillerInput: Chiller:Electric:EIR="CHILLER - AIR COOLED"
** ~~~ ** Energy input ratio as a function of temperature curve output is not equal to 1.0 (+ or schedules.
** ~~~ ** Occurs in - 10%) at reference conditions.
** ~~~ ** Curve output at reference conditions = 0.850
** Warning ** Output:Meter:MeterFileOnly requested for "Electricity:Facility" (TimeStep), already on "Output:Meter". Will report to both eplusout.eso and eplusout.mtr
************* Testing Individual Branch Integrity
************* All Branches passed integrity testing
************* Testing Individual Supply Air Path Integrity
************* All Supply Air Paths passed integrity testing
************* Testing Individual Return Air Path Integrity
************* All Return Air Paths passed integrity testing
************* No node connection errors were found.
************* Beginning Simulation
** Warning ** ZoneHVAC:LowTemperatureRadiant:VariableFlow (heating input) = LOW [LOW TEMP RADIANT VAR FLOW 1
** Severe ** Hydronic 1]
** ~~~ ** Surface [SURFACE 28] temperature below dew-point temperature--potential for condensation exists
** ~~~ ** Flow to the radiant systems may not system will be autosized without specification shut-off to avoid condensation
** ~~~ ** Predicted radiant system surface temperature = 33.33
** ~~~ ** Zone dew-point temperature + safety delta T= 33.79
** ~~~ ** Environment=SOUDA/KHANIA ANN CLG .4% CONDNS DB=>MWB, at Simulation time=07/21 00:00 - 00:10
** ~~~ ** Note that a 1.0000 C safety was chosen in the input for the shut-off criteria
** ~~~ ** Note also that this affects all surfaces that are part of nodes or schedules.
** ~~~ ** Occurs in this radiant system
** Warning ** ZoneHVAC:LowTemperatureRadiant:VariableFlow (heating input) = LOW [LOW TEMP RADIANT VAR FLOW 2
** Severe ** Hydronic 6]
** ~~~ ** Surface [SURFACE 49] temperature below dew-point temperature--potential for condensation exists
** ~~~ ** Flow to the radiant systems may not system will be autosized without specification shut-off to avoid condensation
** ~~~ ** Predicted radiant system surface temperature = 32.67
** ~~~ ** Zone dew-point temperature + safety delta T= 38.23
** ~~~ ** Environment=SOUDA/KHANIA ANN CLG .4% CONDNS DB=>MWB, at Simulation time=07/21 00:00 - 00:10
** ~~~ ** Note that a 1.0000 C safety was chosen in the input for the shut-off criteria
** ~~~ ** Note also that this affects all surfaces that are part of nodes or schedules.
** ~~~ ** Occurs in this radiant system
** Warning ** ZoneHVAC:LowTemperatureRadiant:VariableFlow (heating input) = LOW [LOW TEMP RADIANT VAR FLOW 3
** Severe ** Hydronic 7]
** ~~~ ** Surface [SURFACE 42] temperature below dew-point temperature--potential for condensation exists
** ~~~ ** Flow to the radiant systems may not system will be autosized without specification shut-off to avoid condensation
** ~~~ ** Predicted radiant system surface temperature = 33.01
** ~~~ ** Zone dew-point temperature + safety delta T= 35.55
** ~~~ ** Environment=SOUDA/KHANIA ANN CLG .4% CONDNS DB=>MWB, at Simulation time=07/21 00:00 - 00:10
** ~~~ ** Note that a 1.0000 C safety was chosen in the input for the shut-off criteria
** ~~~ ** Note also that this affects all surfaces that are part of nodes or schedules.
** ~~~ ** Occurs in this radiant system
** Warning ** Temperature out of range [-100. to 200.] (PsyPsatFnTemp)
** ~~~ ** Routine=CorrectZoneHumRat, Environment=SOUDA/KHANIA ANN CLG .4% CONDNS DB=>MWB, at Simulation time=07/21 14:20 - 14:30
** ~~~ ** Input Temperature=200.11
** Warning ** ZoneHVAC:LowTemperatureRadiant:VariableFlow (heating input) = LOW [LOW TEMP RADIANT VAR FLOW 4
** Severe ** Hydronic 5]
** ~~~ ** Surface [SURFACE 35] temperature below dew-point temperature--potential for condensation exists
** ~~~ ** Flow to the radiant systems may not system will be autosized without specification shut-off to avoid condensation
** ~~~ ** Predicted radiant system surface temperature = 28.09
** ~~~ ** Zone dew-point temperature + safety delta T= 28.16
** ~~~ ** Environment=SOUDA/KHANIA ANN CLG .4% CONDNS ENTH=>MDB, at Simulation time=07/21 15:30 - 15:40
** ~~~ ** Note that a 1.0000 C safety was chosen in the input for the shut-off criteria
** ~~~ ** Note also that this affects all surfaces that are part of nodes or schedules.
** ~~~ ** Occurs this radiant system
** Warning ** The resource referenced by LifeCycleCost:UsePriceEscalation= "U.S. AVG COMMERCIAL-ELECTRICITY" has no energy cost.
** ~~~ ** ... It is likely that the wrong resource is used. The resource should match the meter used in Utility:Tariff.
** Warning ** The resource referenced by LifeCycleCost:UsePriceEscalation= "U.S. AVG COMMERCIAL-DISTILLATE OIL" has no energy cost.
** ~~~ ** ... It is likely that the wrong resource is used. The resource should match the meter used in Utility:Tariff.
** Warning ** The resource referenced by LifeCycleCost:UsePriceEscalation= "U.S. AVG COMMERCIAL-RESIDUAL OIL" has no energy cost.
** ~~~ ** ... It is likely that the wrong resource is used. The resource should match the meter used in Utility:Tariff.
** Warning ** The resource referenced by LifeCycleCost:UsePriceEscalation= "U.S. AVG COMMERCIAL-NATURAL GAS" has no energy cost.
** ~~~ ** ... It is likely that the wrong resource is used. The resource should match the meter used in Utility:Tariff.
** Warning ** The resource referenced by LifeCycleCost:UsePriceEscalation= "U.S. AVG COMMERCIAL-COAL" has no energy cost.
** ~~~ ** ... It is likely that the wrong resource is used. The resource should match the meter used in Utility:Tariff.
************* Simulation Error Summary *************
************* There are 3 unused schedules in input.
************* There are 3 unused week schedules in input.
************* There are 6 unused day schedules in input.
************* Use Output:Diagnostics,DisplayUnusedSchedules; to see them.
*************
************* ===== Recurring Error Summary =====
************* The following recurring error messages occurred.
*************
************* ** Warning ** ZoneHVAC:LowTemperatureRadiant:VariableFlow (heating input) = LOW [LOW TEMP RADIANT VAR FLOW 5
** Severe ** Hydronic radiant systems may not be autosized without specification of nodes or schedules.
** ~~~ ** Occurs in 1] condensation shut-off occurrence continues.
************* ** ~~~ ** This error occurred 53532 total times;
************* ** ~~~ ** during Warmup 0 times;
************* ** ~~~ ** during Sizing 0 times.
************* ** ~~~ ** Max=35.882518 C Min=25.368306 C
*************
************* ** Warning ** ZoneHVAC:LowTemperatureRadiant:VariableFlow (heating input) = LOW [LOW TEMP RADIANT VAR FLOW 6
** Severe ** Hydronic radiant systems may not be autosized without specification of nodes or schedules.
** ~~~ ** Occurs in 6] condensation shut-off occurrence continues.
************* ** ~~~ ** This error occurred 124007 total times;
************* ** ~~~ ** during Warmup 0 times;
************* ** ~~~ ** during Sizing 0 times.
************* ** ~~~ ** Max=37.290586 C Min=21.089111 C
*************
************* ** Warning ** ZoneHVAC:LowTemperatureRadiant:VariableFlow (heating input) = LOW [LOW TEMP RADIANT VAR FLOW 7
** Fatal ** GetLowTempRadiantSystem: Errors found 7] condensation shut-off occurrence continues.
************* ** ~~~ ** This error occurred 83808 total times;
************* ** ~~~ ** during Warmup 0 times;
************* ** ~~~ ** during Sizing 0 times.
************* ** ~~~ ** Max=36.035267 C Min=24.842032 C
*************
************* ** Warning ** Temperature out of range [-100. to 200.] (PsyPsatFnTemp)
************* ** ~~~ ** This error occurred 419 total times;
************* ** ~~~ ** during Warmup 0 times;
************* ** ~~~ ** during Sizing 0 times.
************* ** ~~~ ** Max=237.325226 C Min=200.115784 C
*************
************* ** Warning ** ZoneHVAC:LowTemperatureRadiant:VariableFlow [LOW TEMP RADIANT VAR FLOW 5] condensation shut-off occurrence continues.
************* ** ~~~ ** This error occurred 110 total times;
************* ** ~~~ ** during Warmup 0 times;
************* ** ~~~ ** during Sizing 0 times.
************* ** ~~~ ** Max=27.4445 C Min=27.085091 C
*************
*************
************* ===== Final Error Summary =====
************* The following error categories occurred. Consider correcting or noting.
************* Nominally Unused Constructions
************* ..The nominally unused constructions warning is provided to alert you to potential conditions that can cause
************* ..extra time during simulation. Each construction is calculated by the algorithm indicated in input. Preceding conditions cause termination.
...Summary of Errors that led to program termination:
..... Reference severe error count=8
..... Last severe error=Hydronic radiant systems the HeatBalanceAlgorithm
************* ..object. You may not be autosized without specification of nodes or schedules.
remove the constructions indicated (when you use the DisplayExtraWarnings option).
*************
************* EnergyPlus Warmup Error Summary. During Warmup: 0 Warning; 0 Severe Errors.
************* EnergyPlus Sizing Error Summary. During Sizing: 7 Warning; 0 Severe Errors.
************* EnergyPlus Completed Successfully-- 261891 Warning; 0 Severe Errors; Elapsed Time=00hr 00min 48.82sec
I have already seen this post: https://unmethours.com/question/19482/error-when-controling-a-low-temperature-radiant-floor/ these posts:
- https://unmethours.com/question/19482/error-when-controling-a-low-temperature-radiant-floor/
- https://unmethours.com/question/17175/calculated-design-cooling-load-is-zero/
- https://unmethours.com/question/9399/energyplus-design-cooling-load-is-zero/
- https://unmethours.com/question/23927/many-unmet-cooling-hours-with-radiant-floor-with-doas-possibly-due-to-condensation-shutoff/
but I couldn't solve my error. warnings. Could somebody help me please?
The major problem is when I try to export my results to .csv I get "0" Ideal Loads so I can't compare anything. The measure that I use to export to .csv file is:
OpenStudio Measures
- AddOutputVariable with variable name Zone Air System Sensible Heating Energy
- AddOutputVariable 1 with variable name Zone Air System Sensible Cooling Energy
Reporting Measures
- ExportOutputVariabletoCSV with variable name Zone Air System Sensible Heating Energy
- ExportOutputVariabletoCSV 1 with variable name Zone Air System Sensible Cooling Energy
I'm attaching my updated .osm and weather file .epw in a .zip here: http://www.mediafire.com/file/281lrnz1tnqhgkg/radiant_model.zip/filehttp://www.mediafire.com/file/wnc6z4uy8084bcc/radiant_model.zip/file
Thank's in advance!
