what is sequencer (sequencing) of chillers?

[mohsinrkhan86]

Hey friends,
Can anyone please explain me in a simple way about what is sequencing of chillers and what are its effects on a conditioning system?

Awaitung kind help from you guys.
Thanks in advance.

[passandscore]

It is the same as unloading/staging compressors. As the system load drops off you decrease your output capacity by unloading 1 bank at a time and as the load continues to drop you would cycle that compressor off. Chiller staging "sequencing" is the same but in this case you may be controlling your pump speed instead of an unloader and cycling a chiller off instead of a compressor. This prevent the equipment from short cycling (on-off-on-off) and promotes energy efficiency.

http://www.stanford.edu/class/cee115/wiki/uploads/Main/Resources/Chillers.pdf

http://www.mech.hku.hk/bse/cpd/water-system/SYS-APM001-EN.pdf