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Modeling two fans vs one

asked 2021-02-26 20:29:49 -0500

willyJohan's avatar

updated 2021-03-29 08:48:11 -0500

I have not done an exhaustive search, but it seems that all of the air side systems in the prototype models are modelled with only a supply fan.

I see that Appendix G has some language about the baseline fan setup needing to match the proposed design and I can see how this is difficult to implement when there is no proposed design, but if one is trying to assess the savings associated with system elements that would typically have a second fan (energy recovery, in this case) should a second fan be added to accurately reflect the savings?

I am looking to understanding generic savings only and so also do not have a proposed design to model. Am I good just adding the fan power limitation pressure drop adjustment to the supply fan in the same way as the prototypes seem to do or will this approach produce inaccurate savings estimates?

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answered 2021-03-01 12:30:32 -0500

Jian Zhang's avatar

HI there, Your reading is correct. Other than some bathroom and kitchen exhaust fans, the DOE Prototypes only have supply fans, which use the total fan power limitation approach. The ERV fan and ERV wheel power is captured through ancillary power inputs under HeatExchanger:AirToAir:SensibleAndLatent. When there are preheating coils, there are pressure drop adjustments to the total fan power. Happy to hear how others capture the savings.


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Asked: 2021-02-26 20:29:49 -0500

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Last updated: Mar 01 '21