Now
let's see how we calculate the size of the tower with the
available data:
Let's
suppose that the water flow rate is 15 – 20 - 25 m3/ (m2
h), hence we have the size (top
view)
of the tower. We also have the market price and, hence, the
price of the tower.
For
the cost of fan power,
let's assume an air velocity of 3.5 m/s. We therefore know the air
flow rate to the fan and let's assume the yield value of the impeller
at 70%. It's now possible to calculate the power absorbed in kW that
will be useful to determine the fan power
cost.
Using
the same method we can also calculate the power absorbed by the pump
for the water circulation.
The
cost of the installation is calculated to be as much as the cost of
the tower.
Calculations
of the cost for the installation of a cooling tower
|
|
m2
tower (20 m3/h
m2 approx.)
|
1.26
|
Cost
of the tower
|
7,536,000
|
Cost
for installation
|
7.536,000
|
Total
cost
|
15,072,000
|
Calculation
of the cost for the power of the system with tower
|
|
Energy Consumed
|
|
motor
fan motor kW
|
1.05
|
air
flow rate
|
13,565
|
prevalence
mm CA
|
20
|
motorfan
yield
|
70%
|
pump
motor for the movement of water
|
5.42
|
water
flow rate
|
25,12
|
prevalence
m AC supply
|
30
|
yield
of the pump
|
70%
|
Total
kW for circuit tower kW / year
|
12,413
|
Cost
of electricity per year
|
1,241,281
|
Cost
for the make-up water calculated to 5%
m3
/ h
|
1.3
|
Cost
of make-up water
|
2,411,520
|
Cost
bleed-off water (= make-up / 2 x cost of water purge)
|
602,880
|
Cost
of maintenance of the tower 5% of the installation cost
|
753,600
|
Total
operative costs
|
2,597,761
|
Costs
Evaluation
|
|
Cost
with aqueduct water in one year
|
36,172,800
|
Operating
cost of the system with tower
|
2,597,761
|
Savings
in one year
|
33,575,039
|
Savings
each month
|
2,797,920
|
Total
cost of the tower
|
15,072,000
|
The
investment return (ROI) in MONTHS
|
5,4
|
Here
we can see that the ROI payback period for the tower installation is
only 5 and a half months. Because of the small entity involved,
financial costs were not taken into account.
All
of the above calculations are available upon request. For more
information contact us.
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