Hi,
I am having trouble figuring out how to add part load performance curves for both a fuel-fired water heater (mixed) and a gas heating coil in Openstudio v1.5. Opening these HVAC items in the edit window, I can see the blank to select the Curve, but no way to define a new curve.
Thanks in advance!
As of OS 1.7.0 it doesn't appear that these curves can be selected or edited by the user. @Julien Marrec's answer could be a quick fix, but you might run into trouble if you edit the handles.
An alternative is to write a measure to set the curves for the WaterHeaterMixed and CoilHeatingGas objects using setPartLoadFactorCurve and setPartLoadFractionCorrelationCurve respectively.
As of 1.7.0 this is still true.
As a quick fix you can go in text mode, copy a quadratic curve (for water heater) and modify the values, including the name and handle. Open the .osm file with a text editor and search for OS:Curve.
For the handle, as it has been already discussed on this thread Creating handles for OSM objects, instead of changing a number or too it is best to generate a new version 4 UUID (for example here)
All of the answers above sound good to me. I'd just add that you could do what they are suggesting to the hvac_library along the lines here. Then you have access to this feature in all of your models.
Comments
Thanks for your response Julien. By text mode do you mean export to idf and then use the text editor or does Openstudio itself have a text mode?
The openstudio file (OSM) is nothing but text really (just like the idf). Right click the .osm file and open with a text editor, like notepad++. Search for "OS:Curve".
Thanks for the easy fix!