[Bldg-sim] A Question about chilled water usage

[Mark Nieman]

I've usually seen this metric as chilled water usage at the building vs.
chiller energy. This goes in line with installing a Btu meeting for a
campus chilled water system, so you can define the chilled water energy
used at the building, similar to district steam.

 

Mark Nieman, PE, CEM | McKinstry | Sr. Energy Engineer 
d 206.832.8152 | m 206.510.4760 | f 206.832.8552 
FOR THE LIFE OF YOUR BUILDING 

From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Sami,
Vikram
Sent: Friday, September 10, 2010 1:23 PM
To: bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] A Question about chilled water usage

 

I'm looking at utility data for a building on a college campus that has
a central utility plant. They list cooling energy in ton-hrs and It
seems really high for all buildings across the board. 

 

However - if you assume that ton-hrs is the metered chilled water usage
and not the chiller energy, its not that bad. For example if the chilled
water usage is 1 ton-hrs, that's 12,000 BTU's of cooling energy
delivered. However, if whats being measured is chilled water usage (and
not chiller energy), then 1 ton-hr is not the energy consumed by the
chiller - that should be 12,000BTU/COP of the chiller. So if the chiller
COP is 4 - then that's only 3,000 BTU's of energy consumed to deliver
that ton-hr.

 

So - to get to the point - does anyone know if campuses monitor their
chilled water usage (in ton-hrs) as chiller energy or cooling delivered?

 

(I hope this makes snese)

 

Vikram Sami, LEED AP

Sustainable Design Analyst

1382 Peachtree St. NE, Atlanta, GA 30309

t: 404-443-7462    f: 404.892.5823       e: vikram.sami at perkinswill.com
www.perkinswill.com <http://www.perkinswill.com/> 

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