1

Advance V/S conventional

OZONE INJECTION IN HVAC DUCT

2

Advance Ozone

Injection Technolo

gy for IAQ

3

Advance In Duct Ozone

Injection Technolo

gy for IAQ

4

Conventional In Duct

Plate Type Ozone

Injection Technology for IAQ

- Ozone Injection Technology for IAQ

5

No. Points Of Comparison Advance Conventional

1 Technology Ozone Cell Plate Type 2 Ozone Injection In or Outside Duct

[Duct Not Mandatory] In Duct

[Duct Mandatory]3 Ozonator Installation Outside Duct Inside Duct 4 Integration Point Return Air Duct

[Optimum] Supply Air Duct

[Prohibited] 5 Occupant Safety Highest

[Injection in Return Line]Poor

[Injection in Supply Line]

- Ozone Injection Technology for IAQ

6

No. Points Of Comparison Advance Conventional

6 Feed Gas - Ozone Generation

Doesn’t Depend on AHU Air Supply

Depends on AHU Air

7 Effect Of Fine Dust Zero Effect Can't prevent settling on Plates

8 Ozone Capacity Measurable Not Measurable 9 Ozone Generator

InstallationNo part is installed within

Duct Inside Duct

10 Air Flow Restriction Zero Restriction Ozone Plates Restricts Air Flow

- Ozone Injection Technology for IAQ

7

No. Points Of Comparison Advance Conventional

11 Current Concentration[Current per Unit Area]

Uniform Through Out It’s Life Span

Gradually Depreciates

12 Service Frequency Once In Year Monthly Plate Cleaning 13 Efficient Life Span 12 – 15 years 1 – 2 Years14 Emergency Stop Present Absent 15 Occupational Safety Highest Poor 16 Cleans AHU YES NO

- Technology

8

• Advance Technology :- Ozonator is Corona discharge type & installed in

return air line, Outside Duct & Ozone is injected through Anti-oxidant tubing

• Conventional Technology :- In conventional technology Plate type ozonator

in installed in Supply air line, within duct

- Ozone Generator Installation

9

• Advance Technology :- Ozone Generator is installed in AHU room Outside Duct.

• Conventional Technology :- A Cut Out is made in duct & Plate Type ozone

generator is installed within Supply Air duct. • Return air has the maximum pollutant, so ideally ozone injection point should

be in return air. Unfortunately Plate type ozonator can not be installed in return air, because return air has more dust compared to supply air. If plate type ozonators are installed in return air duct, it Quickly gets covered by dust. Eventually restricting generation of ozone.

- Ozone Generation

10

• Advance Technology :- Does not depend Upon Circulating Air in Duct, Ozone

generator has built in Air Pump to produce ozone. • Conventional Technology :- It uses in duct circulating Air to Produce Ozone &

depends upon Circulating Air • Air Flow Quantity & Velocity in duct is designed as per HVAC design standards &

not as per Ozone Generator requirement.

- Effect of Fine dust & Colloidal Particulate Matters

11

• Advance Technology :- Ozone generation is installed outside duct & does not

have any effect of pollutant present in ducts. • Conventional Technology :- It uses in duct circulating Air to Produce Ozone &

depends upon Circulating Air 1. Fine dust & colloidal suspended particulate matter [SPM] gets attracted on

ozone generator plate, due to static electric charge on plates. This dust particle coating on plates reduces generation of ozone gas.

- Effect of Fine dust & Colloidal Particulate Matters

12

2. Also demands more frequent cleaning by completely removing ozone generator from duct.

3. Due to Fine dust & colloidal suspended particulate matter [SPM] getting deposited on ozone generator plates, eventually reduces the open surface area exposed between two plates. This open clean area is responsible for generating corona & producing ozone from induct air. When high voltage is applied to clean plates of plate type ozone generator the uniform current flows between two plates of ozone generator. This is specified in term of current per unit area. Now over the period of time when dust gets coated on these plates, the current through dust reduces. Also relatively open [clean] area current per unit area increases, above design current, damaging ozone plates beyond repair.

- Conclusion

13

1. For Occupant Safety & Efficiency, Ozone Generator should be installed in Return Air line/duct & Never in Supply Air Line/duct

2. Ozone generator should not be placed inside duct, it should be installed outside duct.

3. Ozone generator should be concentric cylindrical & should not be plate type.

4. Ozone gas generation quantity should not be as per manufacturers specification/Test Certificate [TC], generated ozone should be demonstrated/validated as per procedure prescribed by “International Ozone Association” [IOA] at site or in factory. This can be tested either by ozone analyzer or Chemical titration method.

Thank You

14

Solution Engineer : Mr. Sunil ShahContact : +91-93212 34527

Mail ID : sunilshah@chemtronicsindia.comURL : www.chemtronicsindia.comwww.ozonegeneratorindia.comwww.m.chemtronicsindia.com