High Cfm Low Amp Draw Radiator Cooling Fan

The Truth About Airflow and Amperage

When you're in the cooling-fan business for 49 years, you hear a lot of ideas and theories on what makes ane fan better than another. You besides run beyond some pretty interesting ways that people use to make up one's mind what fan they demand to best fit their application. One of the assumptions nosotros frequently hear is that the fans that draw the most amperage are meliorate. We'd like to set the record directly with some facts and definitions, likewise equally some bodily product-testing results. There are a lot of factors that determine the efficiency of an electric fan; the corporeality of amperage the motor requires is simply 1 of these factors.

Amperage and airflow are related, merely you must likewise consider the pitch of the fan blades, the diameter of the fan blades, the fan shroud and likewise what information technology is that you are trying to movement the air through.  For example, is the fan trying to motion air through an oil libation that is but ¾-inch thick, or is it trying to pull the air through a 5-cadre radiator that has an ac condenser and charge-air-cooler stacked in front end of information technology? It may be easiest to empathise if you consider a simplified comparing to the human relationship betwixt fuel economy (rated in miles per gallon, or mpg) and horsepower. Horsepower is a measurement of power output, while fuel economy measures how much fuel was consumed. The two measurements are related, only it doesn't necessarily require a x-percentage increase in fuel economy to create 10-percent more horsepower. Airflow All manufacturers rate their fans by cubic feet per minute (CFM) of airflow at 0 inches static pressure. This is the amount of air the fan moves without anything in forepart of information technology. A typical, 2-cadre radiator will create about 0.v-inches of static force per unit area in front end of the fan. The factors that determine the CFM rating of a fan are the motor, the fan speed (revolutions per infinitesimal or rpm), fan-blade blueprint pitch, number of blades, diameter, area and design of the fan shroud it is built into and static pressure. With a cooling fan, the greater the airflow, the better that fan'southward ability to cool a radiator. Amperage Amperage used to measure how much load an electrical device draws when in operation. Automotive fans are rated at 13.five volts, and the rating is after the motor is at operating RPM. The initial outset up of the fan will have an amperage spike of up to sixty percent, which lasts just a millisecond. Compare the factors that shape the CFM rating of a fan to these items that affect the amperage draw of an electric fan motor: efficiency of the motor, weight of the fan blades, resistance of the electrical components, mechanical resistance of fan rotation (bearings and begetting tolerances) and the amount of airflow (CFM) through the fan. "Expect a tick," you may be saying. If they're not related, why is airflow a factor in amperage? We didn't say they weren't related; we said that amperage doesn't necessarily mean ameliorate cooling. You must consider the amount of airflow produced for the amperage required to produce it. Different airflow - where more is ameliorate - higher amperage draws mean a greater load on your vehicle's charging organization. That load costs you horsepower and fuel economy. Testing To validate our point, we tested 3 electric fan combos. Nosotros chose applications with shrouds that were equally close to the aforementioned size every bit possible, and each philharmonic housing ii electric fans. Here are the stats on all three fan combos: We tested all three in our wind tunnel at Flex-a-calorie-free®. Nosotros created 0.v inches of static force per unit area to simulate a ii-core radiator. The chart beneath shows the results, and shows the difference between rated airflow and tested airflow. While the difference in rated CFM between the Flex-a-lite fan and the Fan "Italia" was 168 cfm with aught static pressure. That difference was farther reduced at 0.5 inches static force per unit area. Yous can also see that Fan "Turkey"looked okay with its stated CFM rating at nil pressure. But with a less powerful electric motor, it moved significantly less air under load compared to the other fans. Summary You tin see from this instance, that choosing an electric fan on airflow (CFM) or amperage draw alone is not ideal. The best electric fan is i that provides the best airflow under load with a reasonable amount of electrical consumption. This will give you the best cooling performance with the smallest touch on on your vehicle'south charging system. Yous tin find more than information and specifications for all our electric fans by clicking here to become to Flex-a-lite.com. Did yous find this info interesting? Want to share it with someone? We make that easy. Click on one of the icons below to mail it to your Facebook account, Tweet about it or share it using ane of the other social media platforms. We also encourage to you sign upward for email updates by entering your email address in the right-paw sidebar. That way you'll get a notification when at that place's a new commodity to read. Nosotros promise not to send too many emails, and you tin can opt out at whatever time. Finally, you tin can add an RSS feed to your favorite homepage by clicking here. This will put our headlines on your homepage correct next to Usa Today and Motor Trend.

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