Ozone generator technologies
The principle for treatment of kitchen exhaust air with ozone is that ozone is generated in a generator located outside the ventilation duct. Ozone is then introduced into the airflow where it continuously reacts on grease particles and pollutants across the whole length of the ventilation. Ozone generators are normally divided into two categories:
- Air-fed ozone generators
- High-performance ozone generators
Both techniques have their own application areas and advantages, which makes them suitable for different requirements and airflows. Read more about how to select the right product for the right application. A general benefit with ozone-based systems is that they do not need to be replenished with any type of chemicals. All that is needed are small amounts of air and electricity. Another benefit is that no parts of the treatment equipment need to be immersed into the greasy exhaust air (c.f. UV-lamps), which significantly lowers the amount of maintenance and consumables needed.
Ozone, O3, is a powerful oxidant but also an unstable gas, which means that residual ozone that hasn’t reacted, breaks down by itself quickly and returns to normal oxygen, O2. It is a great advantage compared to the use of bacteria or other chemicals.
Air-fed ozone generators
Air-fed ozone generators began to be used in the early 2000s. Ozone is formed when the oxygen in the air (21%) gets in contact with an electric field (corona discharge). These generators should be fed with clean supply air from the general ventilation.
Air-fed ozone generators have lower cleaning capacity and therefore fit for street-food establishments, cafes and smaller restaurants with low airflows below 700 l/s, with only one/a few kitchen hoods and moderate grease loads. Ozonetech’s air-fed FTX system is an economic choice in these applications.
We recommend that air-fed ozone generators are only used in applications that are in accordance with EU standard EN 16282-8.
Usually, each hood requires its own dedicated air-fed ozone generator. The ducting between the ozone generator and the ventilation channel must consist of an ozone resistant material, e.g. SS316L.
Advantages of Ozonetech's FTX-series
- Simple handling – connection to electricity and air duct is all that is required
- Suitable for smaller flows – suitable for kitchen hoods in smaller restaurants with moderate grease loads
- Stainless steel
- IP64 class
- Compact design
- Silent operation – below 50 dBA for a healthy work enivronment with low noise levels
- Maintenance – no polishing or cleaning of the ozone element required. The ozone module is readily replaced at low cost if necessary
- Adjustable ozone production (4-20 mA)
- Low investment costs
High-performance ozone generators
Restaurants and commercial kitchens with a deep fryer, grill, wok or griddle demand a highly functional air cleaning system. The kitchen should be fireproof as well as efficient from both a purification and cost perspective. A high purification capacity is required to get rid of grease and cooking odors in the exhaust air. Our experience is that large airflows with high grease loads require a high-performance RENA-system to achieve proper purification. These products have previously only been available for the industrial market, but since 2015, we have made it possible to utilize their unique advantages for all types of restaurants and commercial kitchens.
A central high-performance ozone system distributes ozone by the means of ozone-resistant hoses or pipes to several injection points. This makes it possible to clean the entire duct length as the ozone injection can be done close to the kitchen hood. With a cleaning capacity that supports up to 12,000 l/s and several kitchen hoods, the system becomes cost effective. The RENA systems have a very high performance because of high quality components and efficient liquid cooling.
Benefits with RENA Kitchen Solutions
- High purification capacity – one ozone generator can handle up to 12,000 l/s (approx. 43,000 m3/h)
- Central ozone system – one ozone generator enables efficient treatment of several hoods and ducts
- Flexible installation – the equipment may be placed in elsewhere than the kitchen
- Low LCC – RENA Kitchen Solutions are less expensive with lower lifecycle costs (LCC) compared to equivalent installation with several air-fed ozone generators
- High reliability – Due to liquid cooling medium, approved design and high requirements from industrial applications
- Easily placed and positioned
- Ozone distribution through hose/pipe – easy and flexible to reach one or several injection points near the duct
- No air supply– high-performance RENA Kitchen consumes minimal amounts of air
- SFP-value unchanged (Specific Fan Power) – no pressure drop or airflow balance is affected in the ventilation system
- Adjustable ozone production – manual or 4-20 mA-control
- Silent operation – below 50 dBA which is recommended for a healthy working environment