[Bldg-sim] 90.1 Appendix G pumping power question

[Jim Dirkes via Bldg-sim]

Chris,
I'm glad you pointed that out, because I have not read the PNNL doc yet!

I suspect that since (9 + 13) = 22, the reference is for the chilled water
pumps only. The condenser water pump will always be 19 w / gpm.

On Mon, Aug 15, 2016 at 2:34 PM, 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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-- 

James V Dirkes II, PE, BEMP, LEED AP
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