Spray Water System SWS

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Spray water system Alfa Laval drycoolers&condensers are normally selected to perform

Spray water system

Alfa Laval drycoolers&condensers are normally selected to perform according

to highest ambient conditions

Often, such conditions persist for very short period of the year/hot season peaks

Consequently, the selected product is oversized (...thus more expensive!)

=> a water spray system can help a lot in such cases!!

1

2

"cool" intake air by spraying nebulized water in opposite direction to its flow

mandatory ambient data to know:
- temperature
- relative humidity (RH%)

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Spray water system: calculation example Vshape drycooler design Selected unit: VDDSE806C_ICM

Spray water system: calculation example

 

Vshape drycooler design

Selected unit: VDDSE806C_ICM
customer price:

27070€ (transportation included)

installed el.power: 18kW
Noise level: 60dB(A)

with spray water

Selected unit: VDDSE804C_ICM and spray water system (new duty 840kW!!)
customer price: 22750€ (transportation included)

installed el.power: 12kW (0,55kW pump)
Noise level: 58dB(A)

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Spray water system: advantages & limits More acurate unit design (no

Spray water system: advantages & limits

More acurate unit design (no oversize)
increased

fans efficiency in middle season
Compact&cheaper unit
Less transportations cost
Energy saving
Lower Noise

Availability of water and its quality
Limited working period
ON/OFF activation (no modulation available!)
Ambient relative humidity limitation

Remember: unit equipped with spray water ≠ adiabatic !!
real spray water efficiency ~70%

Limits

Advantages

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Spray water system: range sizes 500/1000l/h 2000l/h

Spray water system: range sizes

500/1000l/h

2000l/h

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Spray water system: components Pumping station Stainless steel piping with spray nozzles

Spray water system: components

Pumping station

Stainless steel piping with spray nozzles

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Spray water system: pumping station Switchboard with pump protection and signals

Spray water system: pumping station

Switchboard with pump protection
and signals (remote

ON/OFF
and fault alarm)

6 bars pump

Safety draining pipe

T joint and draining valve

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Spray water system VDDSE1009C_2000l/h

Spray water system

VDDSE1009C_2000l/h

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Spray water system prototype test

Spray water system

prototype test

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Spray water system: activation mode The spray water system can be

Spray water system: activation mode

The spray water system can be activated

by:
1- ICM control switchboard (EC fans)
2- Master controller/Ptec (EC fans)
3- digital input provided by the customer
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Spray water system: conclusions Optimal cooling effect is given with RH%

Spray water system: conclusions

Optimal cooling effect is given with RH% below

at least 60% (Ambient Temp and relative humidity are mandatory input data)
Spray System is perfect for temperature peaks -> limited usage
Longer usage period is recommended only with a proper fins coating
Less installation and transportation costs
Water quality important
Spray system cannot have the same efficiency level as an adiabatic system
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Spray water system: HOW TO DESIGN From the adiabatic calculation sheet,

Spray water system: HOW TO DESIGN

From the adiabatic calculation sheet, insert:
ambient

Temp
relative humidity
airflow (from CAS)
and calculate the effect of the saturation by taking the assumption of 70% effect efficiency

needed water flow-> pumping station selection (1000l/h)
Saturated air Temperature (for the new CAS design)

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Spray water system: HOW TO DESIGN with Water Flow and Temperature

Spray water system: HOW TO DESIGN

with Water Flow and Temperature Saturated

Air

select the correct equipment in CAS and the SWS