The mathematical model of Air Torque Position dampers with single blade

Abstract

The subject of the research presented in this paper is a mathematical model of ATP (Air Torque Position) damper used for indirect measurement of the flow velocity by measuring the position of the blade and the moment of air stream acting on the blade. The aim of the research is to verify the mathematical model for single blade ATP dampers as representatives of dampers with non-cascading blades. The case of ATP damper with straight pipeline section positioned in front and behind the damper was considered. Verification of the mathematical model was conducted experimentally. The experiment was performed on a laboratory facility which was set up in accordance with recommendations provided by standards for testing dampers used for control of the flow of air in HVAC (Heating, Ventilation and Air Conditioning) systems. The air flow velocity was measured with a hot-wire anemometer using the method of velocity measurement at one point of the conduit; blade attack angle was measured with electric potentiometer and the moment of the air stream acting on blade was measured by the mass sensor and leverage. Based on these measurements, the mathematical model was successfully validated and made ready to be used for accurate measurement of air velocity in single blade ATP dampers under different operating conditions.

Keywords

• atp damper
• hvac
• air velocity measurement