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Studies have shown viruses can spread through the air as well as by physical contact so a preventive strategy must include an effective method of air disinfection. Hand washing alone will not do the job!
Fortunately an ideal solution already exists. For over a century Germicidal Ultraviolet Irradiation or UVGI has been recognized as a highly effective tool against airborne and surface microbial infection. UV light systems are routinely used for disinfection in hospitals,the food industry, and in water purification. In recent years there has been a tremendous growth in the number of UV lights installed in HVAC systems large and small as a means to reduce maintenance by suppressing mold growth and to provide healthier indoor air quality for occupants.
These lights are so effective because microbes have no defense against C-band ultraviolet light (UV-C) which is Germicidal UV Light: A Defense Against Airborne Infectious Diseases not present in daylight (it’s filtered out by the atmosphere). UV-C light sterilizes germs by penetrating their cell walls and scrambling the DNA inside leaving them incapable of reproduction. In the past, UV light has been shown to be effective against influenza strains (including ‘bird’ flu) as well as SARS, legionella, TB, pneumonia, German measles, and many other airborne infectious diseases.
Source: GMC AC Services
When a coil becomes fouled with dirt and grime, it cannot provide adequate or designed heat transfer causing higher discharge pressures. The higher discharge pressure requires more electricity, thereby increasing the costs for operating the equipment. The energy consumption of equipment operating with dirty coils can be as much as 37% more than that used by equipment with clean coils.
For example, a typical 5-ton air conditioning system operating for an average cooling season of 2,400 hours, with clean coils, will cost approximately $2,020 to operate. However, when the coils become dirty, the nine-month cost could escalate to $2,768 a 37% increase or a $778 savings by keeping the coils clean.
DIRTY COILS REDUCE COOLING:
As the dirt and grime collect on the coils it restricts heat transfer causing the compressor to work harder. This adds more heat to the system and raises the head pressure as much as 75%. Higher head pressure can result in a loss of up to 30% of the systems cooling capacity. This loss will be most noticeable on the HOTTEST DAYS when cooling is needed the most!
DIRTY COILS SHORTEN EQUIPMENT LIFE:
Higher operating pressures and temperatures caused by dirty coils can reduce the equipment's life expectancy. The elevated system pressure and temperature can lead to the breakdown of the compressor's lubricant. In addition acid formation can occur, leading to an acid burnout. Lubricant breakdown and acid formation will seriously compromise the compressor and ultimately lead to equipment failure. Compressor failure means NO COOLING. No cooling means no comfort. And, a compressor replacement means a costly repair.
DIRTY INDOOR COILS AFFECT AIR QUALITY:
The evaporator, or inside coil, presents major concerns that include, and go beyond, the issues already discussed. A fouled and dirty evaporator coil creates a breeding ground for bacteria and mold that can impact the indoor air quality. Cleaning, Sanitizing and Protecting the evaporator coil and surrounding areas is critical. Specific cleaners and products will be required for these applications.
Source: Our Learning Center
