Instead of explaining the components in their assembled order, I’ll jump to the Hardor Flex Type connections. Please contact our MicroMetl Customer Service Department with all your diffuser questions and needs.Ĭlick HERE To Download MicroMetl’s New Concentric Booklet!Ĭlick HERE To View Online MicroMetl’s New Concentric Booklet! Did We Miss Anything You’ve Experienced… Leave A Comment! What Is A HVAC Concentric Airflow Diffuser System?īy Abbie Stancato | | Concentrics | 0 CommentsĬoncentric Diffuser Hard Duct System – Figure #1Ĭoncentric Systems are comprised of many components. If it is critical to direct the air throughout a room… Therefore, choose a concentric diffuser with adjustable air blades. It occurs when cool or warm air is too quickly returned through the return air section to the RTU. Short cycling is the result of too little air velocity through the supply side. Too much velocity will cause cold spots, air noise, and drafts, too little will cause hot spots and short cycling. It is crucial to complete each installation with an air balance. Hot spots, cold spots, and air drafts are the greatest complaints of room occupants. This is more of an airflow, air balance issue. Therefore, a transition or flex duct section may become obstructed by the protruding curb wall, preventing the field installer from either obtaining the desired angle of the curb or cause the transition to improperly fit into the curb. If the curb is set to a deep angle, the upper section may extend too far inside of the curb. The Adjustable Pitch Curb is designed with an upper & lower section. ![]() It is feasible when using a flex duct concentric system… if the diffuser section is secured in place and adequate play is remaining in the flex duct connecting the curb to the diffuser. The Vibration Isolation Curb uses springs to “float” the HVAC rooftop unit, The movement from the top section of the curb which contains the duct supports will cause a hard duct section to stress, and pull apart. Obstacle Three: Vibration Isolation Curbs If you can determine the original rooftop (RTU) model that had fit on the existing curb, you could remove or replace the existing curb adapter, order a concentric package to fit the existing curb, and place the new curb adapter over the existing curb trapping the installation. ![]() Depending on the direction and extent of the internal angles you might get lucky! The angled openings allow airflow from the new rooftop unit to the existing curb and will not permit concentric transitions or insert adapters with flex duct to be installed. Too often Curb Adapters contain internal air transitions and plenums. If the existing curb’s duct supports are welded, be prepared to bring a Sawzall to the Jobsite. However, hard duct transitions require that you remove the duct supports and utilize the entire opening (Illustration #2). ![]() Moreover, since our framework and its underlying data are freely available, we hope that it can push the state-of-the-art in air transportation network resilience analysis.When installing a flex duct system (Illustration #1), you can simply lay the flex duct adapters onto the curb’s duct supports and attach the flex duct. Our framework, implemented in Python, makes it easy for other transportation researchers to get started in the area of air transportation network resilience, by having a gold standard as reference. Third, we perform experiments on global air transportation, reporting on critical roles of its elements. Second, we provide an overview on how to estimate the resilience of such a complex system, with methods developed in the Network Science community. First, the chapter derives a framework for modeling air transportation networks based on freely available datasets. The goal of this chapter is to design, implement, and disseminate an open-source framework for the analysis of air transportation networks, their performance, and their resilience. Network Science, together with another recently emerged field, Data Science, leverages the scalable and realistic analysis of air transportation. The effectiveness and resilience of air transportation, as a complex socio-technical system, can be adequately analyzed using tools of Network Science, a recently developed academic field that studies components and interactions among them.
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