[Equest-users] CHW Pump differential temperature

[Xavier García Casals]

Hi,
Probably because the chiller's EIR is reduced due to a more favorable 
inlet temperature. Have a look at your chiller performance curves in the 
model.

En/na Aulbach, John ha escrit:
> All:
>  
> I have run a Base Case and a Parametric run for a Central Plant 
> serving an office complex. Everything in both runs is the same, EXCEPT 
> that the Base run has a 10°F differential temperature and the 
> Parametric run has a 15°F differential temperature. The CHW pump is 
> variable speed.
>  
> As expected, electric energy is saved (about 40,000 kWh/year for a 600 
> ton plant).  However, about 15,000 kWh is saved at the Chilled Water 
> pump, and 22,000 kWh is saved at the chiller.
>  
> I changed the Loop Design DT to 15°F and the CHW Coil Design Delta T 
> to 15°F.
>  
> Why is my chiller energy reducing?
>  
> Thanks.
>  
> John R. Aulbach, PE, CEM
> /Project Manager/
> Nexant, Inc.
> 701 West Kimberly Ave., Suite 245
> Placentia, CA 92870-6342 USA
> Phone: 714-524-4402
> Fax: 714-524-4407
> email: jaulbach at nexant.com <mailto:jaulbach at nexant.com>
>  
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*Xavier García Casals*

 

*Sistemas** Solares, Eficiencia Energética e Ingeniería Bioclimática** *

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