For both mechanical contractors and HVAC engineers, the turning vane is one major source of contention. This has been so because of several contractors believe that the turning vanes are capable of causing ductwork hence becoming less efficient by increasing pressure drop in the system. In addition, it adds time and expenses to overall installation. The logic behind this believe is that whenever there is more surface area exposed to airflow, there increase in friction. The fan also works harder in this case so as to achieve required air-flows.
In instance that there is some difficulty experienced in supply of idyllic content of air flow, many contractors advise that one should eliminate all vanes fitted throughout the system. This in turn will help in reduction of resistance in the duct. On the other hand the SMACNA does not advocate such practice due to the fact that it leads to a change of spacing of the specific vane. It also causes a drop of pressure inside the system as well as decreases the consistency of airflow.
It is however important to be aware of various fundamental details entailing any individual vane. An adjustment in the path of airflow inside a duct that lacks vanes, the bordering walls within the duct should be able to take up the unexpected collision which in turn leads to an alteration in flow of air. The vane main work is to ensure the smooth flowing of the air.
Turning of a vane can lead to an 800 percent increase in efficiency in an elbow. However in the case of a cheaper installation, one may establish that installation of a radius elbow that lack any vane will be a better option. This technique is considerably more efficient as it is cheap and easy to install as well as fabricate.
In other cases, a vane may be what leads to a prominent pressure drop. A sample scenario is when the a vane is put up at the opening of ducts. Huge losses of pressure are caused by such configurations due to specific vane unsettling the regularity of the flow of air within the central duct. Although the costly during fabrication, radius fitting is the most efficient compared to entry fitting as the setting up cost is equal for both forms of fitting.
Improper alignment of any vane in the ducts is another factor that may lead to pressure drop due to increased air turbulence. The turbulence is brought about when these vanes are not correctly aligned in parallel to the ductwork, the flow of air impacts the ducts therefore creating turbulence.
The outcome of such inappropriate alignment is dependent on the alignment of these vanes. Rushed and substandard installation is the focal cause of misalignment which is easily avoidable if thorough inspection is done during installation. It is duty of specified contractor to confirm that such inspections are carried out.
In conclusion, vanes help in increasing the system efficiency and reducing pressure loss. A good designer should take into account various factors such as, most efficient fittings depending on the budget and also increase efficiency at every possible moment. The contractor should also play his role and ensure that no alteration whatsoever is made to the design of the particular vane.
In instance that there is some difficulty experienced in supply of idyllic content of air flow, many contractors advise that one should eliminate all vanes fitted throughout the system. This in turn will help in reduction of resistance in the duct. On the other hand the SMACNA does not advocate such practice due to the fact that it leads to a change of spacing of the specific vane. It also causes a drop of pressure inside the system as well as decreases the consistency of airflow.
It is however important to be aware of various fundamental details entailing any individual vane. An adjustment in the path of airflow inside a duct that lacks vanes, the bordering walls within the duct should be able to take up the unexpected collision which in turn leads to an alteration in flow of air. The vane main work is to ensure the smooth flowing of the air.
Turning of a vane can lead to an 800 percent increase in efficiency in an elbow. However in the case of a cheaper installation, one may establish that installation of a radius elbow that lack any vane will be a better option. This technique is considerably more efficient as it is cheap and easy to install as well as fabricate.
In other cases, a vane may be what leads to a prominent pressure drop. A sample scenario is when the a vane is put up at the opening of ducts. Huge losses of pressure are caused by such configurations due to specific vane unsettling the regularity of the flow of air within the central duct. Although the costly during fabrication, radius fitting is the most efficient compared to entry fitting as the setting up cost is equal for both forms of fitting.
Improper alignment of any vane in the ducts is another factor that may lead to pressure drop due to increased air turbulence. The turbulence is brought about when these vanes are not correctly aligned in parallel to the ductwork, the flow of air impacts the ducts therefore creating turbulence.
The outcome of such inappropriate alignment is dependent on the alignment of these vanes. Rushed and substandard installation is the focal cause of misalignment which is easily avoidable if thorough inspection is done during installation. It is duty of specified contractor to confirm that such inspections are carried out.
In conclusion, vanes help in increasing the system efficiency and reducing pressure loss. A good designer should take into account various factors such as, most efficient fittings depending on the budget and also increase efficiency at every possible moment. The contractor should also play his role and ensure that no alteration whatsoever is made to the design of the particular vane.
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