Tubeaxial Fan is a reliable efficient device that controls heat rise in electronic equipment. In most applications, the fan motor operates continuously when the system is on and in operation.
Tubeaxial fans are available in AC or brushless DC models. They are readily available and inexpensive with many sizes and performance standards to choose from. The efficiency of these fans is rated good to excellent with an axial air flow pattern (located on, around, or in the direction of an axis).
DC Tubeaxial fans is up to five times more efficient than its AC counterpart. The corresponding low heat dissipation of the DC Tubeaxial fan reduces the thermal load of the bearings, increasing life expectancy. Benefits in noise performance are also realized. Speed control is easier and it is also linear which makes it easier to apply. Voltage adjustments can be made to optimize the air flow to cooling requirements that can minimize noise. Generally, DC Tubeaxial fans will operate effectively with voltage reductions up to 50% and voltage increases up to 25% of their normal voltage. Functional monitoring, in many cases, is necessary to protect the devices being cooled. This is easy with DC Tubeaxial fans. An external circuit can evaluate speed/proportional commutation pulses from the internal fan electronics. The signal can be activated if the fan loses speed or stalls to shut down equipment or to activate or increase the speed of other fans.
Below is a list of design objectives to consider when making your choice:
Determine total cooling requirements needed to operate the system efficiently and that provide the desired operating conditions to maximize the system components lifespan.
Define the total system impedance or System Characteristic curve of the enclosure/system. Once load parameters are defined in terms of heat dissipation or number of air changes per hour required, and the required air flow determined, the static pressure characteristics that the moving air will encounter as it passes through, over and around components located within the air flow path must be determined. Elements that impede the flow of air create a pressure rise within the system that restricts free flow and passage of air. The change in pressure, or Delta P, is the static pressure measured in inches of water.
The final step overlays your system characteristic curve on the air performance curves of selected, alternative, air moving devices.
Intersection points are "possible fits" as exemplified in the Operating Point graph. Static efficiency should be considered. It is the optimum relationship of air flow times static pressure divided by power. Rather than calculating this separately, it is most easily found by looking at the slope of the static pressure curve. When the delta slope is at its lowest point in the fourth quadrant (270 - 360 degrees), you can be assured that static efficiency is being maximized. The best air mover for your application will be at the point of intersection of the system characteristic curve and the air performance curve when the intersecting point is on a rising portion of the fan curve, and when the rate of change in the slope is minimized.
It's important to combine all the design criteria and determine the best way to evaluate and prioritize all the factors that play a role in the final selection of the right air mover for your specific application.