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 cases when the HVAC system has particular difficulties in supplying the ideal amount of airflow to concerned zones, it is recommended by many mechanical contractors to remove each and every vane at every fitting in the system. This helps to reduce the amount of friction in a duct. This practice is however not recommended by the SMACNA as it tampers with the turning vane spacing which is required. It also decreases uniformity of airflow as well as increasing the pressure drop in this system.
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.
There is up to 800 percent more efficiency in an elbow that is fitted with turning vane. With regard to the budget, a customer may opt for a cheaper option which would be installation of a radius elbow that is without any vane. The practice is significantly less costly and much easier to fabricate and install.
In some scenarios, an elevated pressure drop maybe caused by any vane. An instance would be when the installation of a vane is done at the way in of these duct. Patterns such as this lead to a huge loss in pressure, which is brought about by the vane disrupting the homogeneity of airflow inside the core duct. Radius fitting has proved to be more efficient than the entry fitting.
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 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.
Consequently it is apparent that vanes support the drop in pressure loss as well as ensure that there is an increase in efficiency. An engineer should therefore ensure that several factors are considered during the design such as, the best fittings are considered depending on the owners cost budget. The contractor is also expected not to make any changes to the designs.
In cases when the HVAC system has particular difficulties in supplying the ideal amount of airflow to concerned zones, it is recommended by many mechanical contractors to remove each and every vane at every fitting in the system. This helps to reduce the amount of friction in a duct. This practice is however not recommended by the SMACNA as it tampers with the turning vane spacing which is required. It also decreases uniformity of airflow as well as increasing the pressure drop in this system.
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.
There is up to 800 percent more efficiency in an elbow that is fitted with turning vane. With regard to the budget, a customer may opt for a cheaper option which would be installation of a radius elbow that is without any vane. The practice is significantly less costly and much easier to fabricate and install.
In some scenarios, an elevated pressure drop maybe caused by any vane. An instance would be when the installation of a vane is done at the way in of these duct. Patterns such as this lead to a huge loss in pressure, which is brought about by the vane disrupting the homogeneity of airflow inside the core duct. Radius fitting has proved to be more efficient than the entry fitting.
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 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.
Consequently it is apparent that vanes support the drop in pressure loss as well as ensure that there is an increase in efficiency. An engineer should therefore ensure that several factors are considered during the design such as, the best fittings are considered depending on the owners cost budget. The contractor is also expected not to make any changes to the designs.
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