Residential DHW Flow Rates in CA Software

asked 2020-11-26 13:54:40 -0600

I know that CBECC-Com and CBECC-Res both use the CSE engine's DHW system calculations for residential space types. I am trying to figure out how the calculation works for multi-family projects, so I can better compare these assumptions to those in the design.

Ideally, I'd like to understand the calculations so I can replicate the peak demand flow rate and hourly (sub-hourly?) schedules. I would settle for being able to extract this info from a T24 compliance simulation after running in CBECC-Com.

I have read Appendix B in the Residential ACM, "Water Heating Calculation Method". It seems to explain how the calculation works, but I just can't make sense of it. I've also reviewed the relevant publications referenced in Appendix F.

I have scoured the files and subdirectories after running a CBECC-Com simulation. I haven't found any files that show the relevant input or results info to/from the CSE engine to give me what I want.

The DHWDU.txt looks to include the hot water draw profiles used for single and multi-family dwelling units, but I haven't been able to reverse-engineer the profiles to make sense of them.

Does somebody out there have a reference you can share or an explanation for building up draw profiles from the DHWDU.txt file? Thanks in advance.

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Hi Greg - I don't know much about CSE, but maybe the GitHub repo has what you're looking for...

MatthewSteen gravatar image MatthewSteen  ( 2020-11-27 14:21:39 -0600 )edit