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Airflow system for lab12/30/2023 Nonlinear Damper– 25 years ago, the venturi was compared to a single blade damper. With the ever‐improving speed and lower cost of microprocessors this has also become a nonissue for closed loop systems which now offer superior performance and reliability to a mechanical pressure independent system. Speed of Response – One positive of an open loop mechanical system was the high speed of response and 25 years ago it could not be matched by the digital controllers in a cost‐effective way. Offering high accuracy, large turndowns and resistance to harsh environments, the vortex shedding airflow sensor is ideally suited for critical airflow control applications. While 25 years ago with only pitot and orifice plates available this had some validity, however the introduction of digital vortex shedding airflow sensors has eliminated this concern. Some of these improvements are:Īirflow Sensing – Venturi suppliers state that airflow measurement is not reliable or that it does not have the turndown required in a laboratory environment. When VAV control of laboratories was first being installed, a mechanical device such as a venturi valve had advantages over closed loop control due to limitations of airflow sensing and the high cost of digital controls with the required scan rates to accomplish the speed of response required for this application.Īs with any industry many improvements have been made which has rendered mechanical open loop control an outdated method of control of a critical environment system. The short answer is that there is no longer a good reason to use a 40‐year‐old mechanical design like a venturi valve with higher operating pressure requirements in your critical environment application.
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