[Equest-users] Parametric Run for Fan Cycling on Demand

[Brian Fountain]

Your strategy for showing the impact of cycling fans on and off using the parametric run and the indoor fan mode keyword is appropriate.  There appear to be a few things going on in the model that are combining to give the results you are seeing.  To begin with, please note that when the indoor fan mode is set to intermittent, outdoor air for ventilation is only supplied when the fan is running.  The internal gains in the model are relatively high – especially the lighting at 2 W/ft² as well as the people load.  The R23 roof is pretty good, minimal glazing.  So, a very large portion of the heating for this model is going to conditioning the outdoor air.  By switching the fans to ‘intermittent’, you are removing most of this outdoor air through the heating season and the fans are only being called on for heating beyond what is covered by the internal gains for a relatively small number of hours.

Other notes – the 70% combustion efficiency on the RTUs seems low to me.

I hope this is helpful.

Brian

From: Equest-users <equest-users-bounces at lists.onebuilding.org> On Behalf Of Ahmad Fraij via Equest-users
Sent: June 5, 2025 6:33 PM
To: BldgSim Mailing List <bldg-sim at onebuilding.org>; PKConsulting via Equest-users <equest-users at lists.onebuilding.org>; equest-users at onebuilding.org
Subject: [Equest-users] Parametric Run for Fan Cycling on Demand

CAUTION: This message originated from outside Smith + Andersen
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Hello All,

I am trying to add a parametric run to make the supply fan cycle based on cooling and heating demands but when I set up the parametric run as per the screenshot below and run simulation, all the space heating energy consumption disappear from the report as there is no heating system. So, am I setting up the correct parametric run as below or I am missing something? I have also attached the Equest files for this project if anyone can help please. Thank you

[Inline image]
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