VRF Performance Curve Sets and Sources

asked 2023-12-22 18:59:30 -0600

willyJohan's avatar

I'm trying to pull together every available set of VRF performance curves and any documentation of the original sources.

So far, I've got 3 sets (taken from the very helpful T24 ACM Appendix 5.7:

  1. EPlus Default curves, which appear to still be based on a 2012 study out of the FSEC
  2. CBECC Defutl curves, which appear to be based on work done in 2016 by NORESCO and reported in docuemnt titel "Development of Modeling Capabilities for Variable Refrigerant Flow Systems for Inclusion in CBECC-Com" which I can not find
  3. OpenStudio default curves (as described in appendix 5.7 anyway) which I am not able to find any source info on.

Then there are a few other sources I'm currently looking into:

Openstudio-Standards on github seems to have a bunch of different files with curves in them but there seems to be a lot of overlap, currently my plan is to perform a detailed review and comparison of the following (with spot checks of all the others):

  1. Curves associated with 90.1.
  2. Curves from prototype models

Ive also found some curve set on the Comstock Github page, i assume some are likely the same as those above but another contains performance maps rather than curves, but either way, ill check those out for any differnces as well

  1. vrf performance curves for Daikin-REYQ72T
  2. VRF performance maps for Daikin_RELQ_100CR_120MBH

So, my questions:

  1. For any of the above sources, particularly those used by OpenStudio, and its various offshoots, could anyone point me to documentation of the original data sources?
  2. Are there any other performance maps used in ComStock other than the one listed above (i.e., does on or both of those files contain every curve referenced in table 3 of this report)?
  3. Are there any other sources out there for curves that i should be aware of? I'm specifically looking for curves that are based on recent VRF equipment

Thanks All.

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Comments

Why are you trying to find existing VRF performance curves created by someone? For new buildings, MEP engineers or yourself will select the latest VRF products and you can create the performance curves from the product performance data. For exsisting buildings, you should already know the VRF product number and you can create the performance curves from the product data. No need to follow curves available on the internet.

Keigo's avatar Keigo  ( 2023-12-23 02:33:52 -0600 )edit

Thanks for the suggestion. Un/fortunately, I'm not modeling any specific piece of equipment, rather, I'm attempting to quantify regional and/or sector wide impacts of installing VRF systems in existing commercial buildings. Also, given time limitations, it would be well worth any loss in system specificity if I am able to leverage an existing data set that is more or less representative of current technology. Though your comment does raise an alternative option that i will pursue in another post.

willyJohan's avatar willyJohan  ( 2023-12-24 16:30:30 -0600 )edit

@willyJohan - Did you ever make progress on this? It would be great to get an update here. Sorry that the community wasn't able to answer your question back in 2022.. FWIW, I think what you were trying to do is quite useful and disagree with the other comment that VRF manufacturer published data is sufficient.

Greg Collins's avatar Greg Collins  ( 2024-07-10 12:40:49 -0600 )edit
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