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Re: [EnergyPlus_Support] How to split chilled water pump head when primary secondary system is used

To: <EnergyPlus_Support@xxxxxxxxxxxxxxx>
Subject: Re: [EnergyPlus_Support] How to split chilled water pump head when primary secondary system is used
From: "seanking.1970@xxxxxxxxxxx [EnergyPlus_Support]" <EnergyPlus_Support@xxxxxxxxxxxxxxx>
Date: 15 Jul 2015 09:29:06 -0700
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Hi Javed,

Thanks a lot for your reply.

I will take a look at where you have directed.

Sean

---In EnergyPlus_Support@xxxxxxxxxxxxxxx, <eee.javed@...> wrote :

In the nutshell,

Total power and gpm are additive for pumps in parallel, but not W/gpm. W/gpm is additive for the total of the primary and total of the secondary, and should equal 22 W/gpm.

â??This has been also discussed on 5/6/2014 and reply from Mr. Jim was very satisfactory.

â??I also found great answers on the following forum:

http://googleweblight.com/?lite_url=http://energy-models.com/forum/baseline-chilled-water-loop&ei=Kh3WWpho&lc=en-IN&s=1&m=96&ts=1436972657&sig=AKQ9UO8MN0Vbf03yLk9RcMxd3Jsv-jbKeQ

â??

Hope this helps!â??

On 15 Jul 2015 20:11, "seanking.1970@... [EnergyPlus_Support]" <EnergyPlus_Support@xxxxxxxxxxxxxxx> wrote:

Hi,

ASHRAE 90.1 G3.1.3.10 indicates that the baseline building design pump power shall be 22 W/gpm, equivalent to 90 feet head with 78% combined impeller and motor efficiency. And the chilled water system should be modeled as primary/secondary systems.

The question is: how to split this 91 ft head to primary and secondary chilled water pumps? They should be evenly distributed or there are some certain portions?

Any comments/advice are welcomed.

Sean

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Posted by: seanking.1970@xxxxxxxxxxx

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References:
- [EnergyPlus_Support] How to split chilled water pump head when primary secondary system is used
  - From: seanking.1970@xxxxxxxxxxx [EnergyPlus_Support]
- Re: [EnergyPlus_Support] How to split chilled water pump head when primary secondary system is used
  - From: Javed Iqbal eee.javed@xxxxxxxxx [EnergyPlus_Support]

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