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.
Asked: 2015-04-01 12:17:12 -0500
Seen: 481 times
Last updated: Apr 07 '15
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!