[Bldg-sim] 90.1 Appendix G pumping power question

Javed Iqbal via Bldg-sim bldg-sim at lists.onebuilding.org
Tue Aug 16 00:29:52 PDT 2016


Dear Chris,

For better understanding, you could refer an old discussion happened back
in Dec 2013 with the search key word "Appendix G Secondary Pump Control" on
bldg-sim. Additionally refer ASHRAE IC-90-1-2007
<https://www.google.co.in/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0ahUKEwjJx72BscXOAhXDGpQKHeepDiwQFggbMAA&url=https%3A%2F%2Fwww.ashrae.org%2FFile%2520Library%2FdocLib%2FStdsInterpretations%2FIC-90-1-2007-14.pdf&usg=AFQjCNEYkFLYjiO5JLXS_CEW5HhaKWugFQ&sig2=2E9zbVXqUzWoYd8H2Mbc5A&bvm=bv.129759880,d.dGo>
which
ruled that 22 W/GPM is a "Whole System" power requirement.

Hope this helps!



On Tue, Aug 16, 2016 at 12:04 AM, Chris Jones via Bldg-sim <
bldg-sim at lists.onebuilding.org> wrote:

> This topic has come up a few times but I am still somewhat confused as to
> how to determine the overall baseline building pumping power for a
> primary/secondary chilled water system.
>
>
>
> Each chiller on the primary loop is to have its own chilled water and
> condenser water pump. The chilled water and condenser water loops have a
> pump each.
>
>
>
> My question is – what flow rate do you use when setting the W/gpm?
> Previously, I have been using the secondary chilled water loop flow for
> determining the 22 W/gpm – split over the primary and secondary loops.
> Similarly, I had been using the cooling tower loop flow for setting the
> overall 19 W/gpm for the condenser water system.
>
>
>
> Today I am reading the PNNL 25130.pdf manual. In 3.7.5, it states, “Each
> chiller has its own primary and condenser water pumps that operate when the
> chiller is active”. Then it states, “All primary pumps shall be 9 W/gpm and
> the secondary pump shall be 13 W/gpm, and the condenser water pump is
> assumed to be 19 W/gpm.”
>
>
>
> Where it states, “All primary pumps shall be 9 W/gpm”, does this mean all
> the pumps associated with the chillers – chilled and condenser water? Or
> just the primary chilled water pumps? If just the primary chilled water
> pumps and not the chiller condenser water pumps, then what pumping power
> should the chiller condenser water pump have?
>
>
>
>
>
>
>
>
>
> *Christopher Jones, P. Eng.*
>
> *Rowan Williams Davies & Irwin Inc.*
> *Consulting Engineers & Scientists*
> 901 King Street West, Suite 400, Toronto, Ontario, M5V 3H5
> *T:* (519) 823-1311 ext 2052
>
> *M:* (416) 697-0056
>
>
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-- 

Javed Iqbal, LEED AP, CEA
Sr. Energy Analyst
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