[Equest-users] I give up

Steven Gates stvgates at pacbell.net
Mon Jun 2 19:49:03 PDT 2008

Do you mean the actual heating load in each space, or the circulation-loop
net load and/or boiler load?  


Particularly when ignoring loop thermal losses, putting a VSD on the pump
reduces the pump heat that goes into the loop, which would otherwise reduce
the net loop load and boiler load. So, by saving pump energy, boiler energy
increases.  If the boiler is electric, it could be difficult to justify the
VSD, as you would simply be trading electric consumption at one point for
consumption at another.



From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Aulbach,
Sent: Monday, June 02, 2008 4:34 PM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] I give up


Double duct or multi zone system - constant volume.


Change three way valves to two way vales and add VFD to HW pump. Space
heating load goes up.


WHY ???



John R. Aulbach, PE, CEM

Project Manager

Nexant, Inc.

701 West Kimberly Ave., Suite 245

Placentia, CA 92870-6342 USA

Phone: 714-524-4402

Fax: 714-524-4407

email: jaulbach at nexant.com


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