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Risks of Hvac / Ventilation Pollution

RISKS AND DISADVANTAGES CAUSED BY HVAC POLLUTION

As we spend 60-90 % of our times in indoor spaces, the quality or inferiority of the indoor air is directly proportional to our life quality. The measurements made by the American Environment Protection Association (EPA) suggest that the indoor air quality even in the isolated smart building is 70 times dangerous than the outdoor air quality. Again according to the statement made by EPA, 50% of the emergence and spread of the diseases are sourced from the foul indoor air quality and 1/6 of the individuals complaining about allergy consult to physician for this reason. According to this source, the workforce efficiency loss in the buildings where no ventilation cleaning is carried out, reaches to 4% which leads to the total national income loss of 60 billion dollars and 1 billion dollars in medical expenses. The importance of the hygiene of the ventilation air is already known at the hospital and health care centres where the hygiene conditions are at the first place.


INDOOR AIR POLLUTION IN TERMS OF OPERATIONAL EFFICIENCY

The dust and dirt particles in the ventilation ducts that are not cleaned result quicker contamination of the filters in the air conditioning centres and earlier finishing of the service life. Moreover the particles absorbed by the duct surfaces accumulate time to time and cause serious surface roughness. It should be reminded that the pressure loss occurring due to the pollution in ventilation ducts is 0,03 for PVC, stainless sheet metal and aluminium, 0,09 for the galvanized sheet metal duct and 0,90 for the plate type glass fibre. The dirt in the filter and duct cause decrease in the air flow due to the fraction losses they create. As the results of the measurements, it is observed that the dirt layer with the thickness of 1mm on the serpentine surface decreases the heat transfer by10 %. In other words, 10% more energy is required for obtaining the same efficiency.



INDOOR AIR POLLUTION IN TERMS OF THE FACILITY LIFE

Dirt and dust particles accumulate easier and more on a surface starting to get dirty and with more roughness, than a clean and smooth surface. The moulds and fungi reproducing on the humid dirt and dust bolus stuck to the metal surface initiate or accelerate corrosion by leading up to more humid adsorption.

 

INDOOR AIR POLLUTION IN TERMS OF FIRE SAFETY

The particular hung in the air form organic compounds in many situations. The situations where the products especially such as flour, coal dust, cereal shells or textile fibres accumulate inside the duct pose bigger danger. As the system is operated by fans, static charge occurs on the duct surfaces and it is known that fire may start with the ignition during the discharge of this load. For example it must be noted that the causes of nearly 500 explosions and fires in Germany resulting 60 deaths until today, were recorded by the fire department statistics as “ the dusts accumulating in the air ducts”.