Open type PLUME ABATEMENT Cooling Tower
SKB RM/SM Model
PLUME can be abated to a larger extent by mixing wet and dry air inside the tower.
You can choose either Low Noise or Extra Low Noise type along with the PLUME
ABATEMENT function.
Maintenance work is simple since PLUME can be curbed under the simple structure.
(No controller or moving part needed!).
Circulation water does not flow in some portion by covering PVC Caps on the top ofsome fillings.
Depending on the extent of plume abatement requirement, three types of PLUME
ABATEMENT type cooling towers are offered as follows:
M2, M4, M7
The better performance of plumeabatement CT is needed, the larger CT size
will be selected under the same coolingcapacity.
M2 is largest, followed by M4, M7 andstandard CT.
M2 do not block "2" water flow space ofeach three. As shown on the left illustration,same as M4 not block 4, M7 not block 7
respectively.
Design example:
Design condition: circulation water volume 1300l/m tw1=37.0℃, tw2=32.0℃, WB=27℃
TypeSKB-100S M7

SKB-100S M4

SKB-100S M2

Measurement30L16W27H

32L18W27H

32L18W27H

Fan

φ1400 x 3.7kw

φ1600 x 3.7kw

φ1600 x 5.5kw

1

Especially when CT operates on a cold day, the air ① (inlet air) is heated and is overhumidified by contacting circulation water, then it turns to outlet air ③. The air is
exhausted and scattered in the atmosphere by using fan, then cooled down. As aresult, the outside air condition goes back to the air ①.

Graph 1Graph 2As shown in the graph 2, when ①→③ line crosses or contacts Saturation Curve, watervapor turns to steam plume over the Fan on the altering process from the condition ③to ①.
On the other hand, the outside air, which flows the dry portion of the fillings, keeps
constant Relative Humidity. Only Dry Bulb rises through the sensible heat exchange.
When ② and ③ are mixed, the air condition turns to ④. This air ④ is exhausted
outside the tower.
Even if ④ goes back to the condition ①, the air does not contact or crossSaturation Curve and plume phenomenon does not occur.
PLUME ABATEMENT type is designed to adjust the air volume ② and ③, then to
optimise the condition ④ by taking the following into consideration;
1. Cooling capacity
2. Outside air condition
3. Plume abatement performance● Standard CT operation on a cold day

2The air ① contacts circulation water directly and conduct the heat exchange, thenit turns to the exhaust air ②.(Shown in the illustration below)
If the condition of the exhaust air ② is under the same condition as ② in theSaturation Curve graph 2, PLUME phenomenon occurs.
● PLUME ABATEMENT type CT operation on a cold day
Some inlet air ①, which passes wet portion of fillings (un-capped portion), turns to ②air. Other inlet air ①, which passes dry portion of fillings (capped portion), turns to ③
air. These ② and ③ air are mixed and exhausted as outlet air ④.
If the air ④ does not contact or cross saturation Curve, plume can be prevented.
(As shown in the Graph 2)
Basic Concept(Standard CT operation on a cold day)

Basic Concept(PLUME ABATEMENT CTOperation on a cold day)Air condition change①→②→①

Air condition change①→②③→④→①

Please make sure to check the following:
The accidental removal of PVC caps would affect the abating performance negatively.
When the filling cleaning is conducted, make sure not to accidentally remove the caps.

3