[Equest-users] VFD Pumping

[Paul Riemer]

Confirm whether you have two-way or three-way CHW valves.

Paul Riemer, PE, LEED AP BD+C
DUNHAM

From: Equest-users [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of John Aulbach
Sent: Thursday, June 18, 2015 2:14 PM
To: Mike Schaefer; equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] VFD Pumping

Michael. can you send your .pd2 and .inp for us to check youtvinputd, please?

John R. Aulbach ,PE

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From:"Mike Schaefer" <mikedschaefer at hotmail.com<mailto:mikedschaefer at hotmail.com>>
Date:Thu, Jun 18, 2015 at 11:49 AM
Subject:[Equest-users] VFD Pumping
I’ve performing an energy model to compare VFD Chiller pumping and Constant Volume Chiller pumping for a multi-story office building using eQUEST v 3.65. Although I expect to save pump energy utilizing VFD pumping I’m not seeing a savings and I believe this is due to my “Pump Properties Inputs”.

For both the VFD and constant volume pump scenarios I’ve input the scheduled pump flow (1,300 gpm) and head (200 ft) and the other pump inputs are default values. The energy difference between the two pumping scenarios is negligible, however, if I set the pump gpm to a default, which inputs a 1.00 Flow Ratio, the energy savings is significant in the VFD pumping model.

Am I over defining the pumps by inputting the scheduled pump gpm? Should the pump gpm always be set to default?

Thanks,


Michael




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