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What are your sources for part-load curve data?

asked 2014-09-12 13:02:51 -0500

ChrisBalbach's avatar

updated 2014-10-22 11:43:50 -0500

Is anyone aware of (publicly available) collections of 'reasonable' part load curves for EnergyPlus component models?

Here are the sources I know of

  1. Simergy library items
  2. E+ datasets (installed with E+)

Is anyone aware of any vendor selection tools that natively create datasets?

Other sources?

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Are you looking for specifically how performance changes with the loading of the equipment? or are you interested in the full gambit of performance curves (e.g., temperature, flow rate, etc.)?

Neal Kruis's avatar Neal Kruis  ( 2014-09-12 14:13:39 -0500 )edit

I would expand on Neal's question: what equipment are we talking about? Any? Fans, pumps, chillers, cooling towers? I think the data sources are going to vary greatly depending on which and how many.

Peter May-Ostendorp's avatar Peter May-Ostendorp  ( 2014-09-12 19:45:40 -0500 )edit

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answered 2014-09-16 10:13:39 -0500

updated 2014-09-16 10:28:03 -0500

I need to credit @Erik Kolderup for showing me this site related to another question but Appendix H - Equipment Curves of the COMNET Modeling Guideline and Procedures is a spreadsheet that summarizes and graphs default equipment curves for a wide variety of HVAC equipment. They are mostly geared toward DOE-2 but may translate into EnergyPlus as well. I haven't played with it very much yet but it contains a lot of information.

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Be careful when translating curves in DOE-2 to EnergyPlus. All of the temperature curves in DOE-2 are for independent variables in Fahrenheit. To convert these to the SI unit system in EnergyPlus requires you to factor out all of the additional constant terms created by the 32 degree offset. It turns into a pretty big mess in the end.

Neal Kruis's avatar Neal Kruis  ( 2014-09-16 13:34:43 -0500 )edit

That's a great point, thanks @Neal Kruis.

Matt Larson's avatar Matt Larson  ( 2014-09-17 10:18:18 -0500 )edit

I just came across this post as I was looking to convert some DOE-2 performance curves to EnergyPlus curves. To my surprise, I discovered that EnergyPlus has a pre-processor tool, CoeffConv, to convert temperature dependent biquadratic curves from oF to oC - it is in the PreProcess sub-directory, where you have installed EnergyPlus.

Maria Mottillo's avatar Maria Mottillo  ( 2014-10-20 07:31:38 -0500 )edit

answered 2014-09-16 03:36:58 -0500

I don't know of any other good sources besides those you mention, however I do have some experience on creation of my own performance curves for VRF systems.

I was in a situation in which I needed VRF performance curves for EnergyPlus and I was given PDF with performance data for a particular unit from a manufacturer.

Essentially I tried to follow the process outlined by this Florida Solar Energy Center document:

A detailed overview of my process, including code, can be found in this blog post:

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Asked: 2014-09-12 13:02:51 -0500

Seen: 837 times

Last updated: Sep 16 '14