Importance of cooling water for the Ozone Generator
Cooling Water for Ozone Generators
Cooling is required for ozone generators. This includes both the power supply unit (PSU) and the container for the ozone generator. Standard cabinet fans or forced conditioned air to the cabinets can be used to cool the PSU and controls. An ozone generator’s rated output is determined by the ambient air temperature for air-cooled generators and the inlet water temperature for water-cooled generators. A one-degree increase in temperature usually results in a decrease in ozone generator output.
The temperature of the ozone generator’s cooling water should be between 15-20 °C, with a maximum temperature of 28 °C. When the cooling water temperature is less than or equal to 32 °C, the ozone generator can operate continuously, but the ozone output decreases.
Water cooling increases capital costs but improves temperature control over the ozone generator. Water is the only effective way to move the amount of heat generated in large systems. Water cooling systems are classified into three types: once-through systems, indirect/once-through systems, and closed loop systems with chillers. The availability of high-quality water and the temperature of the water are important considerations when choosing a cooling water source.
The quality of the cooling water is also an important factor to prevent calcification, so as not to affect the heat dissipation effect of the generator.
Cooling water quality is critical for water-cooled generators to minimise scaling on the heat transfer surfaces. Fouling reduces heat transfer efficiency, resulting in less ozone production and higher maintenance costs. Technically, tap water is the preferred coolant; however, for the water consumption required by large industrial generators, tap water is not economically appealing, unless the generator system is used in a water treatment plant. In contrast to the quality of tap water, generally treated sewage is ineffective as cooling water because it causes scaling.
If high-quality water or other liquids are to be used in the sealed cooling circuit, the final heat exchanger must be designed to minimize contamination; it should be easy to clean and the waste water can also be used as the final heat dissipation. To achieve the best balance between water cost and equipment maintenance cost, most systems should be designed with high-quality potable water from cooling towers or heat exchangers.
The cooling water of the ozone generator adopts open-circuit or closed-circuit circulation based on local conditions, or returns to the process of the water treatment system; appropriate measures such as anti-scaling/anti-organic precipitation are taken based on the characteristics of water quality.