Question-and-Answer Resource for the Building Energy Modeling Community
 | 1 | initial version |
I will "translate" the important warning messages that appear to be causing the simulation to stop.
** Warning ** GetVRFInput: AirConditioner:VariableRefrigerantFlow="VRF HEAT PUMP - BUILDING STORY 1", invalid
** ~~~ ** ...Cooling Energy Input Ratio Modifier Function of Low Part-Load Ratio Curve Name = AIR CONDITIONER VARIABLE REFRIGERANT FLOW 1 COOLINGEIRLOWPLR has out of range value.
A VRF system with a VRF heat pump named VRF HEAT PUMP - BUILDING STORY 1 has an invalid performance curve named AIR CONDITIONER VARIABLE REFRIGERANT FLOW 1 COOLINGEIRLOWPLR. This performance curve is applied to the Cooling Energy Input Ratio Modifier Function of Low Part-Load Ratio Curve Name input field for the VRF heat pump and its value is out of range.
** ~~~ ** ...Curve minimum value of X = 0.500 must be <= Minimum Heat Pump Part-Load Ratio = 0.250.
The performance curve named AIR CONDITIONER VARIABLE REFRIGERANT FLOW 1 COOLINGEIRLOWPLR has a minimum value of the X independent variable (cooling part-load ratio, in this case) set to 0.5, yet the Minimum Heat Pump Part-Load Ratio input field for the VRF heat pump is set to 0.25.
This same issue is seen as similar groups of warning lines in your error file for the Heating Energy Input Ratio Modifier Function of Low Part-Load Ratio Curve Name input field assigned to the performance curve named AIR CONDITIONER VARIABLE REFRIGERANT FLOW 1 HEATINGEIRLOWPLR. These heating and cooling performance curve issues are repeated for another VRF heat pump in the model, VRF HEAT PUMP - BUILDING STORY 2.
If you can reduce the minimum X of the performance curves to 0.25, that should get rid of these VRF warnings and allow the simulation to finish (unless new warnings or severe errors occur after this fix).
