Hello everyone,
I am modeling a refrigerated warehouse in EnergyPlus using the AirChiller object with the following rating conditions:
EuropeanSC2NominalWet for cooling cold rooms with a 1°C set-point (with Temperature Difference Between Cutout And Setpoint of 2 deltaC)
Refrigeration:AirChiller,
East Zone 1 Cooler AirChiller1, !- Name
24h ON Sched., !- Availability Schedule Name
EuropeanSC2NominalWet, !- Capacity Rating Type
, !- Rated Unit Load Factor {W/K}
80000, !- Rated Capacity {W}
, !- Rated Relative Humidity {percent}
-8, !- Rated Cooling Source Temperature {C}
9, !- Rated Temperature Difference DT1 {deltaC}
10, !- Maximum Temperature Difference Between Inlet Air and Evaporating Temperature {deltaC}
1, !- Coil Material Correction Factor {dimensionless}
1.08, !- Refrigerant Correction Factor {dimensionless}
European, !- Capacity Correction Curve Type
, !- Capacity Correction Curve Name
, !- SHR60 Correction Factor {dimensionless}
1, !- Rated Total Heating Power {W}
NO DripDownSched, !- Heating Power Schedule Name
Fixed, !- Fan Speed Control Type
1800, !- Rated Fan Power {W}
5.877, !- Rated Air Flow {m3/s}
, !- Minimum Fan Air Flow Ratio {dimensionless}
Electric, !- Defrost Type
TemperatureTermination, !- Defrost Control Type
NO DefrostSched, !- Defrost Schedule Name
NO DripDownSched, !- Defrost Drip-Down Schedule Name
1, !- Defrost Power {W}
0.7, !- Temperature Termination Defrost Fraction to Ice {dimensionless}
Middle; !- Vertical Location
EuropeanSC3NominalWet for freezing cold rooms with a -17°C set-point (with Temperature Difference Between Cutout And Setpoint of 2 deltaC)
Refrigeration:AirChiller,
West Zone 1 Freezer AirChiller1, !- Name
24h ON Sched., !- Availability Schedule Name
EuropeanSC3NominalWet, !- Capacity Rating Type
, !- Rated Unit Load Factor {W/K}
70000, !- Rated Capacity {W}
, !- Rated Relative Humidity {percent}
-25, !- Rated Cooling Source Temperature {C}
7, !- Rated Temperature Difference DT1 {deltaC}
8, !- Maximum Temperature Difference Between Inlet Air and Evaporating Temperature {deltaC}
1, !- Coil Material Correction Factor {dimensionless}
1.08, !- Refrigerant Correction Factor {dimensionless}
European, !- Capacity Correction Curve Type
, !- Capacity Correction Curve Name
, !- SHR60 Correction Factor {dimensionless}
1, !- Rated Total Heating Power {W}
NO DripDownSched, !- Heating Power Schedule Name
Fixed, !- Fan Speed Control Type
7600, !- Rated Fan Power {W}
12.886, !- Rated Air Flow {m3/s}
, !- Minimum Fan Air Flow Ratio {dimensionless}
Electric, !- Defrost Type
TemperatureTermination, !- Defrost Control Type
NO DefrostSched, !- Defrost Schedule Name
NO DripDownSched, !- Defrost Drip-Down Schedule Name
1, !- Defrost Power {W}
0.7, !- Temperature Termination Defrost Fraction to Ice {dimensionless}
Middle; !- Vertical Location
The model has no fresh air supply, no infiltration, no people, no defrost, and no internal loads. Given these conditions, I expected no latent load in the system. However, the simulation results show that the air-chiller coil has a latent capacity, as indicated in the attached figure.
Any idea what might be causing the coil's latent capacity? Any suggestions for troubleshooting or correcting this issue would be greatly appreciated.
Thank you!
