I am having error below when I try to run the simulation with CoolingTower:TwoSpeed specifying NominalCapacity for Performance Input Method. I input Nominal capacity ,Fan Power, for Low,High Fan Speed. What information do I need to input further to make this calculation work?
** Severe ** CoolingTower:TwoSpeed "COOLING TOWER TWO SPEED 3". Nominal capacity input method has been specified and tower UA at low fan speed is being autosized.
** ~~~ ** Tower UA at low fan speed will be set according to nominal tower capacity.
** Severe ** Bad starting values for UA
** Fatal ** Autosizing of cooling tower UA failed for tower COOLING TOWER TWO SPEED
idf file
CoolingTower:TwoSpeed,
Cooling Tower Two Speed 3, !- Name
Node 289, !- Water Inlet Node Name
Node 290, !- Water Outlet Node Name
Autosize, !- Design Water Flow Rate {m3/s}
Autosize, !- High Fan Speed Air Flow Rate {m3/s}
30000, !- High Fan Speed Fan Power {W}
Autosize, !- High Fan Speed U-Factor Times Area Value {W/K}
Autocalculate, !- Low Fan Speed Air Flow Rate {m3/s}
0.5, !- Low Fan Speed Air Flow Rate Sizing Factor
15000, !- Low Fan Speed Fan Power {W}
0.16, !- Low Fan Speed Fan Power Sizing Factor
Autocalculate, !- Low Fan Speed U-Factor Times Area Value {W/K}
0.6, !- Low Fan Speed U-Factor Times Area Sizing Factor
0, !- Free Convection Regime Air Flow Rate {m3/s}
0.1, !- Free Convection Regime Air Flow Rate Sizing Factor
0, !- Free Convection Regime U-Factor Times Area Value {W/K}
0.1, !- Free Convection U-Factor Times Area Value Sizing Factor
NominalCapacity, !- Performance Input Method
1.25, !- Heat Rejection Capacity and Nominal Capacity Sizing Ratio
3661000, !- High Speed Nominal Capacity {W}
1359000, !- Low Speed Nominal Capacity {W}
0.5, !- Low Speed Nominal Capacity Sizing Factor
, !- Free Convection Nominal Capacity {W}
0.1, !- Free Convection Nominal Capacity Sizing Factor
25.6, !- Design Inlet Air Dry-Bulb Temperature {C}
25.6, !- Design Inlet Air Wet-Bulb Temperature {C}
Autosize, !- Design Approach Temperature {deltaC}
Autosize, !- Design Range Temperature {deltaC}
0, !- Basin Heater Capacity {W/K}
2, !- Basin Heater Setpoint Temperature {C}
, !- Basin Heater Operating Schedule Name
, !- Evaporation Loss Mode
0.2, !- Evaporation Loss Factor {percent/K}
0.008, !- Drift Loss Percent {percent}
, !- Blowdown Calculation Mode
3, !- Blowdown Concentration Ratio
, !- Blowdown Makeup Water Usage Schedule Name
, !- Supply Water Storage Tank Name
, !- Outdoor Air Inlet Node Name
1, !- Number of Cells
MinimalCell, !- Cell Control
0.33, !- Cell Minimum Water Flow Rate Fraction
2.5, !- Cell Maximum Water Flow Rate Fraction
1, !- Sizing Factor
General; !- End-Use Subcategory
