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Ozone injection technique in hvac - modern vs conventional

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Modern technique of Ozone Injection in HVAC systems. Age old conventional technique of Plate Type is outdated due to multiple drawbacks. Modern technique used advance technology of return air induced ozone injection outside duct.

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Ozone injection technique in hvac - modern vs conventional

  1. 1. 1 Advance V/S conventional
  2. 2. 2 Advance Ozone Injection Technology for IAQ
  3. 3. 3 Advance In Duct Ozone Injection Technology for IAQ
  4. 4. 4 Conventional In Duct Plate Type Ozone Injection Technology for IAQ
  5. 5. - 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]
  6. 6. - 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 Installation No part is installed within Duct  Inside Duct  10 Air Flow Restriction Zero Restriction  Ozone Plates Restricts Air Flow 
  7. 7. - 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 Years 14 Emergency Stop Present  Absent  15 Occupational Safety Highest  Poor  16 Cleans AHU YES  NO 
  8. 8. - 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 
  9. 9. - 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.
  10. 10. - 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.
  11. 11. - 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.
  12. 12. - 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.
  13. 13. - 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.
  14. 14. Thank You 14 Solution Engineer : Mr. Sunil Shah Contact : +91-93212 34527 Mail ID : sunilshah@chemtronicsindia.com URL : www.chemtronicsindia.com www.ozonegeneratorindia.com www.m.chemtronicsindia.com

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