[BLDG-SIM] modeling thermal energy storage in Equest

Renee J. Azerbegi renee at ambient-e.com
Mon Aug 21 21:27:00 PDT 2006


Greetings - this email is from Linda Morrison with Ambient Energy.

The physical components of an ice storage plant are a 200 ton screw chiller
used for both making chilled water during the day and ice at night, a
condenser water loop and cooling tower, a chilled water loop, and a thermal
storage component.  The ice storage will be charged at night and the day
cooling load will be met by discharging the ice storage and running the
chiller.

My question is how to best model in eQuest the different operating points of
the chiller because there is a much higher kW/ton during ice production (22
F) than during chilled water production (45 F).  Should I: 

1) have a single chiller represented in Equest and use the part load curve
to get the different kW/ton or 

2) have two chillers represented in eQuest, one which does chilled water and
one which makes ice.  

If option 1 then would averaging the part load curves make sense? If it is
option 2, what is the best way to schedule the chillers (ice and chilled
water are mutually exclusive)?

Thank you very much.  

Regards, Linda

Linda Morrison, PE, CEM, LEED-AP

ambient energy, inc. - solar & sustainable design solutions
linda at ambient-e.com   ambient-e.com
4392 ulysses way,  golden, colorado  80403
direct: 303-860-9634   main: 303-278-1532 fax: 303-278-8533




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