[Equest-users] Trim and respond pumping logic per Section 6.5.4.2

[Byron Burns]

Hello Phillip,

Yes, you should be able to model this within eQUEST using the basic loop controls.  See the help information below for Valve-Reset.  There are additional controls to adjust the loop temperature set-point as well.

Volume 2: Dictionary<mk:@MSITStore:C:\Users\2127\Documents\eQUEST%203-64%20Data\Help\DOE-2.chm::/Docs/volume2dictionary.htm> > HVAC Components<mk:@MSITStore:C:\Users\2127\Documents\eQUEST%203-64%20Data\Help\DOE-2.chm::/Docs/hvaccomponents.htm> > CIRCULATION-LOOP<mk:@MSITStore:C:\Users\2127\Documents\eQUEST%203-64%20Data\Help\DOE-2.chm::/Docs/circulationloop2.htm> > Loop Circulation Pumps<mk:@MSITStore:C:\Users\2127\Documents\eQUEST%203-64%20Data\Help\DOE-2.chm::/Docs/loopcirculationpumps.htm>
HEAD-SETPT-CTRL

Takes a code-word that specifies the type of control sequence used for controlling the head set point of the loop circulation pumps.

FIXED                         The differential head pressure is controlled to a constant set point, specified as HEAD-SETPT. The location of the differential pressure sensor is HEAD-SENSOR-LOCN.

VALVE-RESET              A fixed head set point is not used. Instead the pumps are controlled so that the system head is just enough to provide the required flow to the worst-case coil, with that coil's control valve fully open. In other words, this control sequence monitors the position of the control valves of all coils attached to this loop, and adjusts the head so that the worst-case coil valve is fully open. This minimizes the pump energy wasted through valve throttling. Normally, this control sequence will require a direct-digital control system.



Byron D. Burns, EIT, BEMP
Energy Engineer, Building Sciences Studio

H&A | Hankins & Anderson | www.ha-inc.com<http://www.ha-inc.com>
d: (804) 420-1622 p: (804) 285-4171 f: (804) 217-8520

From: Equest-users [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Philip Kennedy
Sent: Wednesday, December 10, 2014 5:36 PM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Trim and respond pumping logic per Section 6.5.4.2

Does anyone have a straight forward method to model the pumping savings attributed to applying a trim and respond algorithm where the pumping differential set point is manipulated until at least one valve in the system is 90% open of greater?

Our current method involves a lengthy process and three pieces of software plus some custom VBA code.

Is this even possible inside eQuest?

Regards Philip

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