11
ClearSky Operation Logic Diagram Notes
1– Assumes maximum cold water (CW
MAX
) temperature has priority over plume
abatement.
2–Assumes fans are operating at full speed.
3– Assumes vent doors are either all open or all closed. Further operational flexibility
could be gained by only opening or closing some of the vent doors.
4–Assumes dry dampers are closed when vent doors are open.
5– CW
MAX
is the maximum allowable cold water temperature established by the user.
Material temperature limits or process limits may influence this value.
6–
∆
CW is a nominal rise in cold water temperature due to closing vent doors from
their open position. Dry dampers are assumed closed before and after the vent
doors are closed.
7– Dry damper opening increments may need to be empirically determined as the
actuator position is not linear with air flow.
8– Maximum thermal performance mode means that no more damper or vent options
are available to increase thermal performance (to lower the cold water temperature).
9– Maximum plume abatement mode means that no more damper or vent options are
available to increase plume abatement.
➠
operation
DRY DAMPERS
CLEARSKY
HEAT EXCHANGERS
DRY AIR
DUCT
CLOSED VENT
DOOR
OPEN VENT
DOOR
Figure 4
