Where can I find the source data for developing the Cold-Climate HP models in BEOpt Version 3.0?

asked 2023-08-30 12:00:30 -0500

Rohit Jogineedi's avatar

updated 2023-08-30 16:04:58 -0500

Hello, I've been working on Cold-Climate HP modeling in Versions 2.8 and 3.0. I see a huge difference in the way the results look between the two versions. I know that the Version 2.8 models are based on manufacturer's data, however, I was wondering what is the source of the updated Cold-Climate HP models in Version 3.0.

Is there anyone who is aware of the source for Cold-Climate HP models in Version 3.0 and where I can find the data used to develop the models?

Thank you :)

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What kind of differences are you seeing? Note that the default site-to-source energy factors have changes between BEopt 2.8 and 3.0, so you might want to compare site energy.

shorowit's avatar shorowit  ( 2023-08-31 10:52:32 -0500 )edit

I've been capturing the site energy only in both the cases. The difference that I could see is in the total heating delivered and power consumption values of the space heating equipment (including the backup heating).

Rohit Jogineedi's avatar Rohit Jogineedi  ( 2023-08-31 10:56:27 -0500 )edit

If the total heating delivered (heating load) changed, then that will of course result in different heating energy use. Are the changes to heating load and heating energy use roughly proportional? Note that the heating load itself could be different because A) BEopt v3 changed its assumptions for lighting, plug loads, hot water use, etc. from Building America to ANSI/RESNET 301 and/or B) you don't quite have the same inputs specified in BEopt 2.8 and 3.0 (either accidentally differences or because there aren't quite equivalent inputs between the two programs).

shorowit's avatar shorowit  ( 2023-08-31 11:08:27 -0500 )edit

To better understand these scenarios, I've tried plotting COP Vs. Outdoor Air Temperature using the results from both the versions. The BEOpt V3.0 is showing higher COP (approximately 2 times) for the same temperatures. Would this information be of any use to compare the results from both the versions?

Rohit Jogineedi's avatar Rohit Jogineedi  ( 2023-08-31 11:49:24 -0500 )edit

@Rohit Jogineedi Could you email your BEopt 2.8/3.0 project files to scott.horowitz@nrel.gov along with any supplemental information (e.g. spreadsheets or descriptions on how you calculated the COPs)? Thanks!

shorowit's avatar shorowit  ( 2023-09-05 14:28:07 -0500 )edit