chiller plant operation sequence
chiller plant operation sequence
(OP)
hi All,
Can someone advise me what is the normal operating sequence of the cooling tower, condenser Pump, Chiller water pump, chiller and AHU.
Which equipment should start first ?
thanks
Can someone advise me what is the normal operating sequence of the cooling tower, condenser Pump, Chiller water pump, chiller and AHU.
Which equipment should start first ?
thanks





RE: chiller plant operation sequence
My philosophy
Wet the fills first by starting circulation pump of cooling water and then start fan. Secondly, you will come to any irregularities in water flow through cooling tower.
Chilled water primary pump will take care of the higher pressure in the chiller if you start it first.
To reduce initial cooling down time (even though it is marginal)chilled water pump should be started prior to AHU.
Regards,
RE: chiller plant operation sequence
Anyone got experience in the control of chiller starting sequence using bAS software ?
RE: chiller plant operation sequence
Provided the volume of the chilled water system is sufficient to suit the type/capacity of your chiller(s), there should be no problem with "surge/trip" if you start or run the chiller with no load. Typical figures range from 5 litres to 10 litres (or more) per kW of cooling (this needs to be in the primary loop, as water in the secondary loop is not available to the chiller unless there is some flow through the loads (or perhaps through three-port valves).
By the way, I would slightly amend quark's start-up procedure; I wouldn't start the cooling tower fan second - I'd just make sure it was enabled and then it will start / stop as required depending upon requirements (to control cooling tower leaving water temperature).
Brian
RE: chiller plant operation sequence