Abstract
In industrial plants, ships, and buildings, a large amount of gas and air ducts are applied for equipment connection, HVAC, medium transport, and exhaust, etc. These ducts can be designed in varied cross-sectional shapes, such as round or rectangle. The author reveals through geometric calculation of the duct cross-sectional shapes and engineering experiences that the round cross-section is an optimal shape in the duct system. The round duct has the shorter perimeter than the other cross-sectional shape ducts and the stronger structure in the same working condition. The material saving of the round duct due to the shorter perimeter is quantitatively determined. In the pater, it is shown that the round duct is economically attractive. The economic analysis for the material cost saving is illustrated by an example. For a long duct system, the material and material cost savings are significant. It is suggested that the round duct in the gas and air duct system should have priority as long as the field conditions are allowed. In the paper, the material cost saving is also converted to PW, AW, and FW used for LCC economic analysis.
Highlights
Ships, and buildings, a large amount of gas and air ducts are applied for equipment connection, HVAC, medium transport, and exhaust, etc
The author reveals through geometric calculation of the duct cross-sectional shapes and engineering experiences that the round cross-section is an optimal shape in the duct system
The material cost saving is converted to present worth R (PW), annual worth CFM (AW), and FW used for life cycle cost (LCC) economic analysis
Summary
Gas and air duct systems are widely applied in industrial plants, ships, and buildings for the purposes of equipment connection and medium transport, such as in HVAC and exhaust systems. The cross-sectional shapes of the ducts are frequently designed and built in rectangle, square, or round. The duct material most commonly is galvanized metal sheet. Insulations are used which depend on the duct application purposes. The round duct has the least perimeter compared to the rectangular and square ducts with the equal flow sectional area. The material of the round duct comparing to the square or rectangle duct with the equal flow sectional area. While with the equal perimeters, the round duct has the greatest flow sectional area, which will reduce the flow friction apparently. The round duct should be an optimal design in the ductwork application. If a duct system has thousands feet long, the material saving and material cost saving will be significant and other benefits can be obtained by using the round duct
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