Ozone Generator Chiller

Why Ozone Generator Need Cooling?

When the ozone generator is running, most of the electrical energy, around 90% ish, ends up as heat instead of real ozone. If the cooling is not really effective, the discharge gap temperature will keep climbing. Then that heat speeds up ozone breakdown too, and in the end, your ozone production and also the concentration will drop.

So stable cooling is basically critical if you want the level of ozone production you’re after.

For a data point, there is public technical information from the American water treatment company Spartan. They state that at maximum power, when the cooling water inlet temperature goes from 59°F (15°C) up to 77°F (25°C), the ozone generator output can fall by as much as 15%. (That’s pretty noticeable in practice.)

That’s why adding a stable and precise cooling setup, like a water chiller, becomes a key sort of guarantee to keep the unit delivering high output consistently.

How to Select the Most Suitable Ozone Generator Chiller?

Refrigeration Capacity – The Most Crucial Selection Parameter

Figuring out the cooling capacity that your ozone generator chiller needs is the biggest step in the whole selection process.

During the first part of your project, you can more or less follow the steps below for a quick estimation:

• Step 1: Get the technical parameter table that comes from the ozone generator manufacturer. Then, find the part that says “Heat Rejection” or “Cooling Water Requirement”.
• Step 2: If the data there is not clear, you can determine the core cooling capacity by taking the ozone output in kg/h and multiplying it by 9kW.
• Step 3: After that, adjust it using the cooling water temperature at the site, the ambient temperature, and the water source category (oxygen source or air source). For every 1°C rise in the water temperature over the baseline value, it is advised to raise the cooling capacity by around 3% – 5%, give or take.
• Step 4: Finally, add a safety buffer of 10% to 30% to reach the final recommended cooling capacity.

Gas Source Type – Oxygen Source vs Air Source

The type of gas source that goes into the ozone generator directly affects power use and also the cooling needs.

• If it is an ozone generator that uses an oxygen source, you generally see a lower power consumption, something like 6–10 kWh/kg O₃, plus the cooling demand tends to stay relatively small, so it fits medium- to large-sized systems.
• On the other hand, an ozone generator with an air source tends to push the power consumption higher, around 14–18 kWh/kg O₃, and it also makes more heat for the same ozone output. Because of that, you need a bigger chiller capacity to handle the generated thermal load.

Cooling Methods – Air-Cooled Vs Water-Cooled

• Air-cooled chiller: pretty easy to set up, no need for a cooling tower, and also no water circulation system needed. Good fit for small ozone generators, or for those situations where on-site water cooling just isn’t possible or isn’t really there.
• Water-cooled chiller: usually has higher cooling efficiency, and it keeps the temperature more steady. This one works best for medium-to-large-sized ozone generators or when you truly need 24/7 continuous operation, without interruptions or “temperature drifting” issues.

So, if your ozone generator is running continuously for 4 hours per day max, then an air-cooled chiller is enough. But if it needs to run longer than that, then a water-cooled chiller becomes the safer, more dependable option.

Temperature and Flow Rate – Process Parameter Matching

• Target temperature: The industry standard “reference” number is usually 50°F (roughly 10°C) at the entrance and 59°F (about 15°C) at the exit, and the temperature gap is something you keep in the 5–10°F band.
• Flow requirement: Make sure the water flow is really enough to take away heat from the reaction chamber plus the power module. If the water volume ends up being too low, then the ozone generator control unit will trigger an alarm automatically.
• Temperature control accuracy: For higher precision use cases, you typically have to pick a temperature control accuracy somewhere around ±0.1°C up to ±0.5°C.

Water Quality and Preservation – Material Selection

Ozone is kinda corrosive. Because of that, the water system inside the chiller kind of needs to be built with anti-corrosion materials, or it will just age fast in a not-so-good way.

• For the evaporator part, you should pick shell-and-tube or plate-and-fin evaporators. For the metals, 316L stainless steel, 304 stainless steel, or titanium are commonly used.
• For pumps, go with stainless steel anti-corrosion pumps, or if needed, use a chemical pump setup.
• For water quality management, it is recommended to run softened water or use a closed-loop system. Also keep the water hardness under 100 mg/L so the heat exchanger doesn’t get fouled easily.

Environmental and Installation Conditions

• Environmental temperature: When the operating area is on the hot side, the cooling performance of air-cooled models usually goes down, so you have to expand the selection margin a bit more than normal, too.
• Installation space: Air-cooled units tend to be compact, and they generally do not need a cooling tower. Water-cooled models, meanwhile, require extra area for the cooling tower and also the water treatment system, so planning space is important.
• Noise requirements: In places where sound sensitivity is high, like commercial facilities, you really should keep an eye on the equipment noise level and not just assume it will be fine.

Selection Reference Table

You are still not 100% sure about the chiller capacity you need, right? Please send us the model and the operating parameters of your ozone generator, and our engineers can then recommend a suitable chiller for you based on that.

How to Reduce the Operating Cost of an Ozone Generator Chiller?

To reduce your operating costs, you can start with the following five aspects:

Step 1—Make Sure the Cooling Capacity Is Matched

There is a pretty common tendency to oversize in ozone system chiller design. Oversizing doesn’t just raise the upfront capital cost; it also directly bumps up the power usage while it runs. I can give you a kind of practical reference: about 9 kW of cooling capacity is needed for each kilogram of ozone. So you can select it based on this yardstick. To avoid the problem of waste due to excessive product selection.

Step 2—Pick a Closed Ozone Generator Chiller

Even if an open-loop system seems cheaper when you look at the initial investment, during continuous operation, every gallon of water that gets used will trigger water charges and sewage fees. If you’re cost-sensitive, a closed-loop system may be a better fit. In a closed-loop setup, the same cooling water keeps getting recirculated, so the need for water refill drops to almost nothing.

The closed-loop system usually makes the chiller draw a bit more electricity, but in situations where water resources are expensive or you run it long-term, the money you save on water fees normally covers that extra energy use.

Step 3—Keep the Heat Exchanger Clean-ish

Once the heat exchanger surface starts getting scale stuck on it, or if biofilms start forming over it, the heat transfer effectiveness goes down. For every 1°F rise in condenser temperature, the chiller’s energy use goes up by around 1.5%. Ozone can be employed to suppress microorganisms and delay biofilm formation, but you still have to routinely check it and clean the heat exchanger.

Step 4—Regular Maintenance

It also helps to set up a preventive maintenance plan, maybe with regular checkups of compressors, pumps, refrigerant circuits, and the control system parts. By doing this, you can catch small issues earlier—before they grow into big failures. Then you can avoid costly emergency repairs and that annoying, unexpected downtime.