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.
One should however be conscious of some vital facts with regards to the individual vane. A change in airflow course within the duct devoid of vane, the flanking walls of these duct must soak up the sudden impact thus leading to change of the airflow in principle route. The most important function of these vanes is to assist in airflow.
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 some instances, the vane may cause a raise in pressure drop. One of these case is when the individual vane is installed at the opening of a duct. Such a configuration may lead to large losses in pressure, this due to the fact that the vane can disrupt uniformity of the airflow within the main duct which then leads to an increase in pressure drop. Entry fitting is less efficient than the radius fitting, though the radius is slightly expensive when it comes to fabrication.
An inappropriate alignment of specific vane inside the ducts is an additional characteristic that causes pressure drop due to heightened air havoc. The havoc is as a cause of these vanes not been associated in parallel. The air collision with the ducts leads to the turbulence.
The effect of improper alignment varies depending on how far off the alignments of the vanes are. Misalignment is caused by sloppy or hasty installation and can be avoided by performing regular checks. It is usually the contractor that ensures proper and error free installation.
Thus it is evident that vanes are important in reduction of pressure loss and assist in increase of the overall efficiency of any system. A first class designer should however take into consideration various issues such as ensuring that the most competent fittings are installed with regard to the customer budget. He should also strive to ensure that the efficiency is increased gradually.
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.
One should however be conscious of some vital facts with regards to the individual vane. A change in airflow course within the duct devoid of vane, the flanking walls of these duct must soak up the sudden impact thus leading to change of the airflow in principle route. The most important function of these vanes is to assist in airflow.
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 some instances, the vane may cause a raise in pressure drop. One of these case is when the individual vane is installed at the opening of a duct. Such a configuration may lead to large losses in pressure, this due to the fact that the vane can disrupt uniformity of the airflow within the main duct which then leads to an increase in pressure drop. Entry fitting is less efficient than the radius fitting, though the radius is slightly expensive when it comes to fabrication.
An inappropriate alignment of specific vane inside the ducts is an additional characteristic that causes pressure drop due to heightened air havoc. The havoc is as a cause of these vanes not been associated in parallel. The air collision with the ducts leads to the turbulence.
The effect of improper alignment varies depending on how far off the alignments of the vanes are. Misalignment is caused by sloppy or hasty installation and can be avoided by performing regular checks. It is usually the contractor that ensures proper and error free installation.
Thus it is evident that vanes are important in reduction of pressure loss and assist in increase of the overall efficiency of any system. A first class designer should however take into consideration various issues such as ensuring that the most competent fittings are installed with regard to the customer budget. He should also strive to ensure that the efficiency is increased gradually.
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