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BeOpt - Cooling Energy vs Cooling Fan/Energy

asked 2025-04-30 11:13:47 -0500

agamas's avatar

updated 2025-04-30 11:42:09 -0500

I'm currently running some simulations in BeOpt (2.8) and I'm having difficulties understanding, and finding information about what's exactly the distinction between "Cooling Energy" and "Cooling Fan/Energy" results. I found another question here in UnmetHours that more or less addresses the question (https://unmethours.com/question/46524...), but I wonder if anyone could assist me in understanding what exactly each of those two categories entail?

Also, I wonder if it would be fair to consolidate those two separate results into just one "Overall Cooling Energy" category for clarity purposes when communicating with a client? (I'm getting some unintuitive results if I just compare different system types in terms of "Cooling Energy", without the fans)

Thanks!

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answered 2025-04-30 12:55:27 -0500

The "Cooling Fan/Pump" energy will include blower fan energy use for central air conditioners and air source/mini split heat pumps. (Packaged equipment, like room air conditioners, does not have the fan energy disaggregated.) On the heating side, it will include blower fan energy use for forced air furnaces as well as pump energy for, say, a boiler or ground-source heat pump.

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Thanks, A couple of follow-up questions:

1) Energy losses through ducts are reported in "Cooling Energy" right?

2) Would it be correct to assume that energy savings for higher SEER systems will be mostly reflected in the "Cooling Fan/Pump" category (considering higher SEER values affect fan efficiencies)?

agamas's avatar agamas  ( 2025-04-30 14:16:15 -0500 )edit

I think you are oversimplifying things.

  1. Duct losses result in higher cooling loads, so more system runtime and/or a higher capacity. Either way, both fan and compressor energy will be impacted.
  2. Higher SEER systems can be more efficient for a variety of reasons, only one of which is the possibility of a more efficient fan. (Other possibilities: compressor staging, more heat transfer surface area, better controls, etc.) Typically both fan and compressor energy will be impacted.

There are other things that contribute to energy use too -- crankcase heating, defrost energy, etc.

shorowit's avatar shorowit  ( 2025-04-30 15:30:28 -0500 )edit

I see, thanks, that's helpful.

By any chance is there a document or manual that you could recommend, to have a better grip on these BeOpt/Mech.Systems intricacies?

agamas's avatar agamas  ( 2025-04-30 19:07:33 -0500 )edit

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Asked: 2025-04-30 11:12:39 -0500

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Last updated: Apr 30