Hello ladybug community, I am adding an HVAC system, and I realize that different connection methods will have a great impact on the results. However, different connection methods bring different energy consumption results and errors.
What should the correct connection method be, and what causes the difference in HVAC access to the room?
method1: The hvac system is connected after the room components.
method2: According to the case file, before processing the adjacent surface, the room is connected to the hvac component, and then the adjacent surface is processed.
ERROR：
openstudio.model.CoilCoolingDXSingleSpeedlAs of 3.5.0, bool cdeclopenstudio::model::CoilCoolingDXSingleSpee:setRatedEvaporatorFanPowerPerVolumeFlowRate(class boost::optional)is deprecated.
Use setRatedEvaporatorFanPowerPerVolumeFlowRate2017instead.
What does this warning mean? What is the impact of this situation on the output results? It seems that it did not cause serious errors in Open Studio, but since I need to serve actual projects, I still need more accurate data, so I am eager to know the reason behind it.
Dear community, I have asked Claude. This warning message indicates that you are using a deprecated method and suggests a new alternative method. Let me explain the meaning and internal logic of this warning:
Warning content analysis:
Warning comes from the model.CoilCoolingDXSingleSpeed class
The method setRatedEvaporatorFanPowerPerVolumeFlowRate has been deprecated
It is recommended to use the new method setRatedEvaporatorFanPoverPerVolumeFlowRate2017
Code internal logic:
This method is used to set the ratio of the rated evaporator fan power to the volume flow rate of the single-speed DX cooling coil
OpenStudio updated the implementation of this method in version 3.5.0
My software installation is fully compliant with the Compatibility Matrix.
1\So, how much impact does the warning have on the simulation results?
Using the old method may cause inaccurate simulation results, but the program can still run, it’s just a warning. I just want to know if professionals can give me a credible answer.
2\Can someone point me a way to fix the warn by modifying the code.
Replace the following code:
setRatedEvaporatorFanPowerPerVolumeFlowRate(value)
with:
setRatedEvaporatorFanPoverPerVolumeFlowRate2017(value)
I guess the main difference is due to the HVAC systems which are different in your scripts. The ajdacency check will generally change your external walls to internal ones. But I assumed there will be no differences here given the same geo.
Please refer to the TipsAndTricksUsingEnergyPlus.pdf under the EnergyPlus installation folder to understand the three levels of errors. DesignBuilder has summarized some examples here as well: EnergyPlus Errors
Please refer to the InputOutputRference.pdf under the EnergyPlus installation folder, the definition of the fan power has been explained here:
