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





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@xxxxxxxxxxx [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: Javed Iqbal <eee.javed@xxxxxxxxx>


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