Correlation Between Surface Roughness And Dust Build-Up In Fabric Duct And Galvanized Steel Duct : A Comparison

Mohammad Rosli, Muhammad Hafizi (2017) Correlation Between Surface Roughness And Dust Build-Up In Fabric Duct And Galvanized Steel Duct : A Comparison. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

The ductwork system was primarily used for conduit conditioned air to the living space. The sources of indoor air pollution may be present from our air duct system which is the equipment that plays a major role in air distribution inside the building. Dust particles are the major contaminants encountered in the HVAC system especially inside the ductwork system. Large amount of dust entering will affect the cleanliness of the ductwork system thus provides bad air quality to the human not only just decrease air flow rate and may increase energy consumption. This paper focuses on dust build-up, type of air ducts material and find the correlation between surface roughness and dust build-up. Two types of air duct was selected which is fabric duct and galvanized steel duct in order to make a comparison. The mean roughness profile of both duct measured by using portable surface roughness tester and the surface roughness of fabric duct is 2.173 μm which is four times higher compared to the galvanized steel duct that only shows 0.478 μm of surface roughness profile. The results of dust build-up inside the both of HVAC air ducts measured using vacuum test method. The vacuum test was found to be an efficient method of collecting dust samples on the duct surface. The dust at three different interval of distance are vacuumed at a specific area of 100cm2. The mean amount of dust build-up on fabric duct was slightly higher compared to the galvanized steel duct. The highest mean amount of dust build-up was found at the end of the ducts and the lowest amount is near the duct fan outlet.

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