[Equest-users] e-Quest doubt

Fri Mar 1 16:36:05 PST 2019

Anthony beat me to the punch.

A related point which may be helpful is that the end-use breakdown represented in PS-E reflects the peak demand makeup at the meter at the time when that meter hits its net peak.  It’s quite possible this hour doesn’t line up with a time when each of your project’s fans is operating at maximum capacity (if they ever hit that point all at once).  Realities like variable speed drives and more broadly fan system diversity (demonstrable by quantifying FLEH < 8760) can commonly trip up reviewers who aren’t provided enough information / instruction to explore/diagnose this issue in the model outputs.

Hope that helps!

~Nick

[cid:image004.png at 01D4D05D.9DC3D560]
Nick Caton, P.E., BEMP
  Senior Energy Engineer
  Regional Energy Engineering Manager
  Energy and Sustainability Services
  Schneider Electric

D  913.564.6361
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From: Equest-users <equest-users-bounces at lists.onebuilding.org> On Behalf Of Anthony Hardman via Equest-users
Sent: Friday, March 01, 2019 4:10 PM
To: Balaji Jaishankar <bjaishankar at mepcinc.com>; equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] e-Quest doubt

This is just saying that your simulated fan demand never reaches the design day values (probably calculated by different engineers, using different assumptions and different software) shown on mechanical schedules.  Take a look at your SS-L reports and you’ll be able to see what your fans are doing relative to design day conditions.

Anthony Hardman, PE, BEAP, LEED AP BD&C
Senior Building Performance Analyst, Owner
The Green Engineer
Sustainable Design Consulting
23 Bradford Street, 1st Floor, Concord, MA 01742
Direct: 978.341.5459  |  Office: 978.369.8978
E: anthony at greenengineer.com<mailto:anthony at greenengineer.com>

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From: Balaji Jaishankar [mailto:bjaishankar at mepcinc.com]
Sent: Friday, March 1, 2019 12:25 PM
To: equest-users at lists.onebuilding.org<mailto:equest-users at lists.onebuilding.org>
Subject: [Equest-users] e-Quest doubt

We are modelling a typical office building with multiple shells in e-Quest.

  1.  The fan demand in the “Performance output tab” which is obtained from “PS-E Energy End use summary “ is less compared to the Fan design input in “ Air side HVAC tab which is obtained through “ SV-A System Design Parameters” report.
This henceforth creates a flag in the final performance outputs tab which reads “The fan demand ( as reported from performance outputs tab) for the baseline and or proposed exceeds the fan power as reported from “ Air side HVAC tab”.

Please advise on where we could be going wrong with the inputs that we are seeing this difference in both proposed and baseline models. Fan curves are as per ASHRAE 90.1 using method 2 of table G3.1.3.15

Balaji Jaishankar, LEED AP BD+C, EMIT | Energy Engineer       [MEPC Logo] <https://emea01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.mepcinc.com%2F&data=02%7C01%7CNicholas.Caton%40se.com%7Ce135b9ed43f0465c295308d69e92b563%7C6e51e1adc54b4b39b5980ffe9ae68fef%7C0%7C0%7C636870750287177570&sdata=wpPR4%2B4cc9qBABANEvtt6XUbym18NU2OOkP9ZdSQbSA%3D&reserved=0>

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