Flow78's profile - activity

Hi all,

I have many errors when I run the simulation but I don't understand the problems and I don't know how to resolve them. If someone can help me that can be very useful ! I copy-past the kind of errors I have.

CheckWarmupConvergence: Loads Initialization, Zone="AHU 4" did not converge after 25 warmup days. ...Environment(SizingPeriod)="BALTIMORE BLT WASHNGTN INTL ANN CLG .4% CONDNS WB=>MDB" ..Max Temp Comparison = 0.14 vs Temperature Convergence Tolerance=0.40 - Pass Convergence ..Min Temp Comparison = 3.79E-006 vs Temperature Convergence Tolerance=0.40 - Pass Convergence ..Max Heat Load Comparison = 0.0000 vs Loads Convergence Tolerance=4.00E-002 - Pass Convergence ..Max Cool Load Comparison = 0.5164 vs Loads Convergence Tolerance=4.00E-002 - Fail Convergence

UpdateZoneSizing: Cooling supply air temperature (calculated) within 2C of zone temperature ...check zone thermostat set point and design supply air temperatures ...zone name = AHU 1 ...design sensible cooling load = 812355.99 W ...thermostat set point temp = 0.000 C ...zone temperature = 26.809 C ...supply air temperature = 26.667 C ...temperature difference = -0.14226 C ...calculated volume flow rate = 4319975.64733 m3/s ...calculated mass flow rate = 5173659.00476 kg/s

Plant flows do not resolve -- splitter inlet flow does not match mixer outlet flow Environment=BALTIMORE BLT WASHNGTN INTL ANN CLG .4% CONDNS DP=>MDB, at Simulation time=07/21 00:00 - 01:00 PlantLoop name= CONDENSER WATER LOOP Plant Connector:Mixer name= CONDENSER WATER LOOP DEMAND MIXER Mixer outlet mass flow rate= 246067293.760194 {kg/s} Plant Connector:Splitter name= CONDENSER WATER LOOP DEMAND SPLITTER Splitter inlet mass flow rate= 246067293.760194 {kg/s} Difference in two mass flow rates= 2.980232E-008 {kg/s}

Thank you very much for your help !

Hi all,

I would like to run the simulation but I have 31 errors especially because of the HVAC system. These errors are for example like this one :

UpdateZoneSizing: Cooling supply air temperature (calculated) within 2C of zone temperature ...check zone thermostat set point and design supply air temperatures ...zone name = AHU 1 ...design sensible cooling load = 1784609.90 W ...thermostat set point temp = 0.000 C ...zone temperature = 26.719 C ...supply air temperature = 26.667 C ...temperature difference = -5.24004E-002 C ...calculated volume flow rate = 15182420.16951 m3/s ...calculated mass flow rate = 18182663.80103 kg/s

Or like this one :

CheckWarmupConvergence: Loads Initialization, Zone="AHU 8" did not converge after 25 warmup days. ...Environment(SizingPeriod)="BALTIMORE BLT WASHNGTN INTL ANN CLG .4% CONDNS ENTH=>MDB" ..Max Temp Comparison = 2.37E-002 vs Temperature Convergence Tolerance=0.40 - Pass Convergence ..Min Temp Comparison = 7.48E-006 vs Temperature Convergence Tolerance=0.40 - Pass Convergence ..Max Heat Load Comparison = 0.0000 vs Loads Convergence Tolerance=4.00E-002 - Pass Convergence ..Max Cool Load Comparison = 7.6322E-002 vs Loads Convergence Tolerance=4.00E-002 - Fail Convergence

I don't know how to resolve these problems and if someone can help me that can be cool !

Thank you.

Florian,

Hi all,

I try to run the simulation but I have 31 errors because of the HVAC system. Some errors are like this one :

UpdateZoneSizing: Cooling supply air temperature (calculated) within 2C of zone temperature ...check zone thermostat set point and design supply air temperatures ...zone name = AHU 1 ...design sensible cooling load = 1784609.90 W ...thermostat set point temp = 0.000 C ...zone temperature = 26.719 C ...supply air temperature = 26.667 C ...temperature difference = -5.24004E-002 C ...calculated volume flow rate = 15182420.16951 m3/s ...calculated mass flow rate = 18182663.80103 kg/s.

Or like this one :

CheckWarmupConvergence: Loads Initialization, Zone="AHU 11" did not converge after 25 warmup days. ...Environment(SizingPeriod)="BALTIMORE BLT WASHNGTN INTL ANN CLG .4% CONDNS ENTH=>MDB" ..Max Temp Comparison = 4.60E-004 vs Temperature Convergence Tolerance=0.40 - Pass Convergence ..Min Temp Comparison = 1.93E-006 vs Temperature Convergence Tolerance=0.40 - Pass Convergence ..Max Heat Load Comparison = 1.0000 vs Loads Convergence Tolerance=4.00E-002 - Pass Convergence ..Max Cool Load Comparison = 6.0292E-002 vs Loads Convergence Tolerance=4.00E-002 - Fail Convergence

But I don't understand how to resolve them. If someone can help me that can be cool !

Thank you.

Florian,