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Cooling a hard anodize tank


What's a good way to cool a hard anodize tank (temperature about 28 °F., -2 °C)?

Most people seem to run the Freon refrigerant vapor, in lead coils, right through the tank. But I don't like direct refrigeration like this.

What I'd prefer is a chilled water-glycol solution at about 10 degrees F., and an air-cooled chiller. But most vendors are telling me they don't want to run the chilled water loop at below 25 degrees F, -4 degrees C), and I figure we need to be down to about 10 degrees F, -12 C, unless we want the coils to be gigantic.

Ted Mooney, Teds signature
Ted Mooney, P.E.
Pine Beach, New Jersey


Instead of water-glycol, you could use a water-salt system through a flapped lead coil. This way you can go down to -15 °C. We use an ammonia system to cool the brine, and then is pumped through a 48 meter long coil to cool a 7,000 liters tank between -2 to +2 °C.

Saludos desde Mexico

Guillermo Luna
- Mexico City, Mexico


Ted, externally cooled hardcoat anodized tanks make the most sense to me!

1. You can operate with a higher temperature of sulfuric acid than you indicated 10 °F.

2. You eliminate the need for internal coils that take up working area.

3. You eliminate the need for shielding of the cooling coils for electrical insulation.

4. More efficient than coils, especially at low temperatures.

We are currently installing a new hardcoat anodize tank at this moment, to increase our capacity.

Joe Hillock
anodizing shop - Philadelphia, Pennsylvania

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