[Bldg-sim] Baseline pump efficiencies

[Cheney]

Hi Rathna,

Pay attention to the total Baseline chiller capacity as well.

1.) Baseline chillers <=300 tons: The chilled water loop is modeled with
constant primary/variable secondary flow with the secondary pump riding the
curve.  Primary chilled water loop (1 constant speed pump) + the secondary
chilled water loop (1 constant speed pump) +  the condenser water loop (1
constant speed pump);

2.) Baseline chillers >300 & < 600 tons: The chilled water loop is modeled
with constant primary / variable secondary flow.  Primary chilled water loop
(2 constant speed pump interlocked with associated chillers) + the secondary
chilled water loop (1 variable speed pump) + the condenser water loop (2
constant speed pump interlocked with associated chillers);

3.)  Baseline chillers >= 600 tons: The chilled water loop is modeled with
constant primary / variable secondary flow. Primary chilled water loop (2
constant speed pump interlocked with associated chillers) + the secondary
chilled water loop (1 variable speed pump) + the condenser water loop (2
constant speed pump interlocked with associated chillers);

My  understanding is, as long as 22W/gpm and 19W/gpm can be applied to all
baseline water pumps, you can allocate pump energy to each pump based on
your common sense (e.g. 6w/gpm for primary and 16w/gpm for secondary).  From
there, you should be able to adjust pump configuration to fulfil its
allocated energy.

Regards,

Cheney

LinkedIN @ http://ca.linkedin.com/pub/yu-cheney-chen/27/637/72b



On Tue, Oct 18, 2011 at 5:10 AM, Bishop, Bill <wbishop at pathfinder-ea.com>wrote:

> Rathnashree,****
>
> ** **
>
> **1)      **The ASHRAE baseline pump power requirement has been discussed
> in the equest-users forum. There was not a consensus, but the votes were
> leaning toward splitting the 22W/gpm between the primary and secondary
> pumps, and not assigning 22W/gpm to each pump. See the archives here:
> http://lists.onebuilding.org/htdig.cgi/equest-users-onebuilding.org/2010-November/006942.htmland here:
> http://lists.onebuilding.org/htdig.cgi/equest-users-onebuilding.org/2010-December/007044.html
> ****
>
> **2)      **I believe the inputs for the chilled water pump power would be
> “CCIRC-HEAD = 75”, “CCIRC-IMPELLER-EFF = 0.65” and “CCIRC-MOTOR-EFF = 1.0”.
> ****
>
> **3)      **Again, per the archive threads I provided, there was no
> consensus. You need to make a judgment call on how to split the power up.*
> ***
>
> **4)      **I believe the inputs for CW pump power would be “TWR-PUMP-HEAD
> = 60.0”, “TWR-IMPELLER-EFF = 0.60” and “TWR-MOTOR-EFF = 1.0”.****
>
> ** **
>
> Regards,****
>
> Bill****
>
> ** **
>
> [image: Senior Energy Engineer]****
>
> ** **
>
> *From:* bldg-sim-bounces at lists.onebuilding.org [mailto:
> bldg-sim-bounces at lists.onebuilding.org] *On Behalf Of *Rathna Shree
> *Sent:* Tuesday, October 18, 2011 1:54 AM
> *To:* bldg
> *Subject:* [Bldg-sim] Baseline pump efficiencies****
>
> ** **
>
> Dear all,****
>
> ** **
>
> ASHRAE 90.1 appendix G G.3.1.10 defines the base building pump power. I
> have basic questions regarding this:****
>
> ** **
>
> 1)    Is 22w/gpm for both primary and secondary pumps put together? ****
>
> ** **
>
> 2)    The user manual defines 22w/gpm as pump operating against a 75 foot
> head with 60% combined impellar and motor efficiency.****
>
> I work on Visual Doe. I have to input impellar efficiency and motor
> efficiency separately. How do i input these values?****
>
> ** **
>
> 3)    If 22w/gpm is including secondary pump, then what will be the head
> and efficiencies for primary pump and secondary pump?****
>
> ** **
>
> 4)    The condenser water pump power is 19 w/gpm. What is the head,
> impellar efficiency and motor efficiency?****
>
> ** **
>
> Looking forward for your replies.****
>
> ** **
>
> Regards,****
>
> Rathnashree****
>
> ** **
>
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