About the geometry of transition pieces relative to the flat-oval tubing

Abstract

Air quality - a fundamental component of well-being - is assured through ventilation and/or air conditioning installations. The air transport is made by relatively large ducts equipped with auxiliary pieces to ensure the distribution of air in the rooms and the suction of contaminated air respectively. The less generalized tubing type with a flat-oval section cumulates the benefits of both circular and rectangular ducts. In this paper, the authors present the geometry of the reducing and enlarging pieces of the flat-oval ducts section, and of the transition pieces between the flat-oval sections and circular or rectangular sections, respectively. Using the descriptive geometry methods, one obtains the patterns required to construct these pieces.

Keywords

• ventilation
• flat-oval tubes
• transition piece
• development of surfaces
• patterns