EDM SYSFREECOOL
SysFreeCool
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3
Free-cooling function is used when cooling operation is
required in combination with low ambient temperature
availability.
Two typical application are:
Process cooling: need for cooling operation with con-
stant load all year around, in example industrial process
or server room temperature control
Air conditioning: need for constant cooling operation due
to high building internal loads (lights / people / indoor
activity)
Three operating modes are possible:
No free cooling (Hot season): cooling capacity is totally
covered by refrigerant cycle (chiller) because outdoor air
temperature is higher than return water temperature. In
this case free cooling coil is by-passed through 3-ways
valve
Partial free cooling (Intermediate season): cooling capac-
ity is provided in part by free-cooling coil and in part by
refrigerant cycle (chiller). 3-ways valve is fully open to-
wards the coil, while chiller is operating in partial mode,
since brine temperature exiting from free-cooling coil is
higher than chiller water set-point
Total free cooling (Cold season): cooling capacity is to-
tally covered by free-cooling coil. 3-ways valve is fully
open towards the coil, while chiller is in OFF, since brine
temperature exiting from free-cooling coil is equal or
lower than chiller water set-point
Main advantages of free-cooling module if compared to
the standard integrated free-cooling solution are:
Flexibility: thanks to the fact that the module is physi-
cally independent from the unit it is possible to choose
Key points
the best size matching, according required free-cooling
capacity and sound level
Fan deck independency: there’s no need to nd a com-
promise between chiller and free-cooling fan deck man-
agement. In partial free-cooling operation, chiller fan
deck is typically part loaded (due to low outdoor ambient
temperature, unit part loaded operation and – as a con-
sequence – low condensing pressure) while free-cooling
fan deck has to run at max speed in order to catch the
maximum available energy from outdoor environment, due
to the limited difference between outdoor air temperature
and return water temperature
Free-cooling technology allows signicant energy saving,
rapid investment pay-back and a remarkable CO
2
seasonal
indirect production decrease.
Seasonal electricity consumption - Q
CE
- STOCKHOLM
Outdoor air temperature (°C)
Q
CE
per BIN (kW/h)
35000
30000
25000
20000
15000
10000
5000
0
-25 -20 -15 -10 -50510 15 20 25 30
35
SyScroll 290 Air CO+FC
SyScroll 290 Air CO