Cooling Capacities - Lennox CWC 090-4P Installation, Operation & Maintenance Manual

COOLING CAPACITIES

COOLING CAPACITIES
EXAMPLE: For the unit CWC 090-2P with chilled water rise of EXAMPLE: For the unit CWC 090-2P with chilled water rise of
ºC, chilled water temperature 7 ºC and entering air temperature ºC, chilled water temperature 7 ºC and entering air temperature
ºC DB/19 ºC WB, according to the diagram the cooling capacity is: ºC DB/19 ºC WB, according to the diagram the cooling capacity is:
Total cooling capacity = 8450 W Total cooling capacity = 8450 W
Sensible cooling capacity= 6600 W Sensible cooling capacity= 6600 W
To estimate the water flow use the formula Qw=Pt x 0.86 To estimate the water flow use the formula Qw=Pt x 0.86
Qw = Water flow (l/h) Qw = Water flow (l/h)
Pt = Total cooling capacity (W) Pt = Total cooling capacity (W)
T = Inlet water temperature - outlet water temperature (ºC) T = Inlet water temperature - outlet water temperature (ºC)
For the example given Qw =1453 l/h and water pressure drop in page For the example given Qw =1453 l/h and water pressure drop in page
8 is 28 Kpa. 8 is 28 Kpa.
DB : Dry bulb DB : Dry bulb
WB : Wet bulb WB : Wet bulb
CORRECTION FACTORS
T = 5 T = 5
27 27
The given values have been calculated for
a high-speed fan. For a different speed,
the given values must be multiplied by the
following correction factors:
T T
6
Low
speed
Cooling
0,8
Capacity
Medium
speed
0,9