I am modelling the cost benefits of creating chilled water/ice at night
so I have added a thermal storage tank and set up a secondary chiller
and loop to serve the storage tank. I have assigned an on/off schedule
to the TES chiller so that it operates only at night, but I have also
added equipment controls so that it has first priority for cooling. This
was my initial thought on getting it to operate at night but not during
the day. I am getting an error "Ice Water Loop has zero design flow". At
first I figured this was because I had no size for the storage tank
selected so I started off small and through a 50 ton tank in the
capacity field. Still receiving the same error. Does this have to be
sized manually?

Here are the controls:

"Chiller Controls" = EQUIP-CTRL

TYPE = COOLING

CIRCULATION-LOOP = "Chilled Water Loop"

CHILLERS-1 = ( "Ice Chiller" )

CHILLERS-2 = ( "Air Cooled Chiller 1" )

..

and the tank

"Ice Storage" = THERMAL-STORAGE

TYPE = COLD-WATER-TANK

CAPACITY = 600

CHRG-LOOP = "Ice Water Loop"

CHRG-SCH = "Ice Making Schedule Annual"

DCHRG-LOOP = "Chilled Water Loop"

..

Thanks in advance

Alan Jackson, LEED(r) A.P.