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An axial box fan for cooling electrical equipment. Axial-flow fans have blades that force air to move parallel to the shaft about which the blades rotate. This type of fan is used in a wide variety of applications, ranging from small cooling fans for electronics to the giant fans used in cooling towers. Axial flow fans are applied in air ...
Ceiling fans increase air speed at the occupant level, which facilitates more efficient heat rejection, cooling the occupant, rather than the space. [10] [11] [12] Elevated air speed increases the rate of convective and evaporative heat loss from the body, thus making the occupant feel cooler without changing the dry bulb temperature of the air ...
Therefore, ceiling fans that have a mechanism for reversing the direction in which the blades push air (most commonly an electrical switch on the unit's switch housing, motor housing, or lower canopy) can help in both heating and cooling. While ceiling fan manufacturers (mainly Emerson) have had electrically reversible motors in production ...
Figure 1: Components of a centrifugal fan An external motor belt driven inline centrifugal fan discharging inline to the exterior of a building through a duct. Unlike non-inline/non-concentric impeller casing design with a cutoff blade above, the concentrically symetric cylinder casing and impeller geometry of inline type redirects the outflow around so that it is parallel to the inflow of gases.
Factors which determine the performance of the fan include the number and shape of the blades. Fans have many applications including in wind tunnels and cooling towers. Design parameters include power, flow rate, pressure rise and efficiency. [1] Axial fans generally comprise fewer blades (two to six) than centrifugal fans. Axial fans commonly ...
The "Vortex Action" technology and uniquely-designed blade was also used for Vornado-branded heaters, air purifiers, and humidifiers. Between January 1989 and August 1990, Vornado sold about 135,000 of its fans with a distinctive spiral front grille. In August 1990, competitor Duracraft began offering a cheaper, visually similar fan, and by ...