ON-LINE Cleaningof

Air Coolers (“fin-fan”)

InnovativeTechnologyInnovativeTechnology

D. D. Technology Inc.Long Beach, CA

Phone 818-469-4437 Fax 214-613-2557

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

The D. D. T. process is:

EFFICIENT SAFEENVIRONMENTALLY FRIENDLYCOST EFFECTIVE

Other methods ofCleaning Air Coolers

No cleaning at all….

Cleaning with high-pressure water jets

Other methods ofCleaning Air Coolers

Cleaning with detergents (soap, foam)

Cleaning with acids

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

Damaged fins due to other techniquesWe guarantee that our cleaning will not damage the aluminum fins

D. D. T. dry-chemical cleaning method(1) spray dry chemicals, bottom-to-top

(2) Rinse with water top-to-bottom

Our chemicals

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

Powder flow acts differently than Liquid flow

Cleaning in action

No need for scaffolding No need to enter into the housingNo need to remove the safety net

Cleaning during normal operation

Visible Results !!

Half-clean Half-dirty fins

Inlet/Outlet temperatures Airflow Power of the fan

Parameters to monitor:

Before Cleaning After Cleaning

Before Treatment: T in = 47.9CT out = 40.8C

After Treatment: T in = 47.2CT out = 37.5C

Delta T = 3.3 C (8.1%)

Throughput benefit: 1,180 $/dayEnergy consumption benefit: 243 $/day

Example of increased Air Cooler efficiency

Environment: The D. D. T. process is Environmentally friendly

NO creation of wasteChemicals are salts and easily dissolved in water Chemicals are compatible with biological treatment

SAFETY: The D. D. T. process is SAFETemporarily turn-off each fan for only 40-45minNo Scaffolding needed

Chemicals are non-corrosive and compatible with all types of metallurgy, non-hazardous, non-explosive, non-toxic

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.