1. ON-LINE Cleaning
of
Air Coolers (“fin-fan”)
Innovative
Technology
Innovative
Technology
D. D. Technology Inc.
Long Beach, CA
Phone 818-469-4437 Fax 214-613-2557

2. Fouled Air Cooled Heat exchangers lead
to the following problems:
- Low heat transfer efficiency
- High pressure drop
- High outlet temperature
- High energy consumption (fan power)
- Low throughput
- Low total efficiency

3. The D. D. T. process is:
EFFICIENT
 SAFE
ENVIRONMENTALLY
FRIENDLY
COST EFFECTIVE

4. Other methods of
Cleaning Air Coolers
No cleaning at all….
Cleaning with
high-pressure
water jets

5. Other methods of
Cleaning Air Coolers
Cleaning with
detergents (soap, foam)
Cleaning with acids

6. The DISADVANTAGES
of other methods:
 No cleaning means low efficiency
 Walking on fins causes fin damage
 High pressure water causes damage to fins
 Foam/Soap evaporates before penetrating
 Acid causes damage to fins

7. Damaged fins due to other techniques
We guarantee that our cleaning will not damage the aluminum fins

8. D. D. T. dry-chemical cleaning method
(1) spray dry chemicals, bottom-to-top
(2) Rinse with water top-to-bottom

9. Our chemicals
Nano-sized powder that does not damage the fins,
penetrates all the way through the bundle.

10. Powder flow acts differently than Liquid flow

11. Cleaning in action

12. No need for scaffolding
No need to enter into the housing
No need to remove the safety net
Cleaning during normal operation

13. Visible Results !!
Half-clean Half-dirty fins

14.  Inlet/Outlet temperatures
 Airflow
 Power of the fan
Parameters to monitor:
Before Cleaning After Cleaning

15. Before Treatment: T in = 47.9C
T out = 40.8C
After Treatment: T in = 47.2C
T out = 37.5C
Delta T = 3.3 C (8.1%)
Throughput benefit: 1,180 $/day
Energy consumption benefit: 243 $/day
Example of increased Air Cooler efficiency

16. Environment: The D. D. T. process is
Environmentally friendly
NO creation of waste
Chemicals are salts and easily dissolved in water
Chemicals are compatible with biological treatment

17. SAFETY: The D. D. T. process is SAFE
Temporarily turn-off each fan for only 40-45min
No Scaffolding needed
Chemicals are non-corrosive and compatible with all
types of metallurgy, non-hazardous, non-explosive,
non-toxic

18. Excellent results
Other methods :
 Cause fin damage
 Superficial Cleaning
The D. D. Technology process is:
EFFICIENT
 SAFE
ENVIRONMENTALLY FRIENDLY
COST EFFECTIVE
D. D. Technology Inc.
Our Innovation. Your Saving.