www . refrigerationandaircon . co . za RACA Journal I August 2024 41
Technical
GUIDED APPROACH TO APPLYING UV-C TO MECHANICAL VENTILATION SYSTEMS
Compiled by Eamonn Ryan from the 3rd SAIRAC Johannesburg Tech Talk online presentation by Edward Erasmus on the topic ‘ Guided Approach to Applying UV-C to Mechanical Ventilation Systems ’
Edward Erasmus represents Sani UV-C , a company that specialises in UV-C application used across various applications including cold rooms , vehicle transportation , HVAC systems , and water systems .
UV-C light is a form of invisible light that effectively destroys the DNA of viruses and bacteria . This destruction occurs when pathogens are exposed to UV-C light for a sufficient duration , rendering them incapable of reproduction . The use of UV-C for disinfection has been well-documented and proven over hundreds of years .
Erasmus emphasised the importance of understanding the correct application of UV-C technology to ensure costeffectiveness and efficacy . He pointed out common issues such as the tendency of users to purchase UV-C devices online without proper guidance on their application , leading to suboptimal results . He recommended selecting robust , quality UV-C fixtures and performing regular maintenance .
Erasmus also discussed the relationship between UV-C light and ozone . “ Ozone is generated when UV-C light splits an oxygen molecule ( O2 ) into single oxygen atoms ( O1 ), which then bond with O2 molecules to form ozone ( O3 ). This ozone is useful for surface sanitation , odour control , and in the treatment of drinking water .”
One of the key challenges Erasmus noted is the misconception about the placement and effectiveness of UV-C lamps . Users often mistakenly place UV-C devices in areas without considering factors such as air flow and exposure time . He stressed the importance of a guided approach , where the positioning and maintenance of UV-C fixtures are strategically planned to maximise their disinfection capabilities .
DURABILITY AND INSTALLATION CONCERNS Erasmus highlighted the importance of installing durable fixtures , particularly in environments with high moisture , potential mould growth , and bio-loading areas . “ Without robust fixtures , components may need to be replaced frequently , leading to increased costs and inefficiencies . Properly engineered UV-C fixtures are essential for ensuring
© RACA Journal
A section of the audience at a typical inperson SAIRAC Tech Talk .
www . refrigerationandaircon . co . za RACA Journal I August 2024 41