[Equest-users] ECM motors modelling in eQuest

[Pramod .D]

Hi Sharad,

Thanks for the information. Can we give a part load fan curves if we know the part load fan power data? Or there any other way to model this apart from VFD as mentioned in your mail?

Regards,
Pramod


From: Equest-users <equest-users-bounces at lists.onebuilding.org> On Behalf Of Sharad Kumar via Equest-users
Sent: Friday, August 2, 2019 5:22 PM
To: equest-users <equest-users at lists.onebuilding.org>
Subject: Re: [Equest-users] ECM motors modelling in eQuest

Hi Pramod,

As per me the ECM motors modelling has to be chosen in between constant flow ,variable flow and other flow options.

The limitation that eQUEST have is to opt between constant, variable or two speed for fan flows.
But as we know that ECM motors are also efficient and mightily run as a variable kind of fan.
At low speed the ECM is over 30% more efficient than a standard induction motor. The ECM motor has a minimum efficiency of 70% throughout its entire operating range.

So as per me due to lack of accuracy in modeling the ECM motors i could have gone for modelling it as a variable speed fan flow parameters in eQUEST.


Thanks and Regards,
Sharad.Kumar
Freelancer
India.

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From: "Pramod .D" <d.pramod at setty.com<mailto:d.pramod at setty.com>>
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Date: Thu, 1 Aug 2019 16:52:36 +0000
Subject: [Equest-users] ECM motors modelling in eQuest
Hello Masters,

I am working on a project where DOAS with ECM motors are used. This is something new to me. Has anyone of you came across this?

The DOAS fans use EC motors and not VFDs. Apparently this fans has unloading efficiency power savings. The fan efficiency appear to be very low (around 50%-60%), but it is compensated by premium EC motors supposed to give power savings. I have no clue on how to model this.

Awaiting your responses,
Regards,
Pramod
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