[Equest-users] Modeling Fan Static Pressure Reset in eQuest

Thu Sep 9 08:55:49 PDT 2021

Nice find Christina!
All,
I compiled the three fan curves at the bottom of Table 50 into the attached input file. You can load them into your eQUEST models using File -> Import File…
A few comments about use of these curves with Appendix G modeling in eQUEST:

  *   Static pressure reset control is a prescriptive requirement in 90.1-2016 6.5.3.2.3. Therefore, most proposed designs should include SP reset and supply fans should be modeled using the “MZVAV Good SP Reset Fan Curve” attached.
  *   The “Multi Zone VAV with VSD and fixed SP setpoint” curve in Table 50 is the same curve required by Appendix G. Supply fans for Baseline System Types 5 through 8 should be modeled with this fan curve.
  *   Appendix G3.1.3.15 says the same curve applied to Systems 5 through 8 should be applied to Baseline System 11. However, the PNNL PRM Reference Manual p.3.154 says use the “Single zone VAV fan” curve which is based on perfect static pressure reset and uses the least energy of all the Table 50 curves.
  *   Up until now, I have always used the same fan curve for both supply and return fans (SYSTEM:FAN-EIR-FPLR and SYSTEM:RETURN-EIR-FPLR). However, the PRM Reference Manual p.3.158 says use the “Multi zone VAV with static pressure reset curve” for Baseline Systems 5 through 8 and 11. I don’t know if this is an error or if there is logic to using a more efficient fan curve for return fans.
  *   Table 50 also has a column for %Powermin, or minimum fan power as a percent of full load power. The values are 20% for MZVAV with fixed SP setpoint (the standard App.G curve) and 10% for the two static pressure reset curves. However, Appendix G also requires minimum volume set points of 30% for Baseline Systems 5 through 8 and 50% for System 11 (entered in eQUEST using ZONE:MIN-FLOW-RATIO and which should also be adjusted for minimum OA if necessary). The combination of MIN-FLOW-RATIO and fan curve will dictate the minimum fan power percentage instead of the %Powermin.
Regards,
~Bill

William Bishop, PE, BEMP, BEAP, CEM, LEED AP
Senior Energy Engineer
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From: Equest-users <equest-users-bounces at lists.onebuilding.org> On Behalf Of Christina LaPerle via Equest-users
Sent: Thursday, September 9, 2021 7:52 AM
To: fraij <fraij at yahoo.com>
Cc: equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Modeling Fan Static Pressure Reset in eQuest

Hi Ahmad, I typically model this using the fan curves from the PNNL 90.1 2016 PRM Reference Manual. I provided some screenshots below. Christina Christina LaPerle PE, BEMP, CEM, CBCP Senior Energ
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sophospsmartbannerend
Hi Ahmad,

I typically model this using the fan curves from the PNNL 90.1 2016 PRM Reference Manual. I provided some screenshots below.

[cid:image001.png at 01D7A560.83A12AE0]

[cid:image002.png at 01D7A560.83A12AE0]

Christina

Christina LaPerle PE, BEMP, CEM, CBCP
Senior Energy Engineer, Associate
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On Thu, Sep 9, 2021 at 7:47 AM fraij via Equest-users <equest-users at lists.onebuilding.org<mailto:equest-users at lists.onebuilding.org>> wrote:

Hello Guys,

What is the best way to model fan static pressure reset in eQuest software?

Regards

Ahmad

Sent from my Galaxy

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