Greenheck - Vari-Green Motor vs. Belt Drive Motor

Transcript:

Greenheck's Vari-Green E C motors are quickly becoming known for their energy efficiency and speed adjustability. And for many applications, those advantages are often making Vari-Green direct drive fans a better choice than belt drive fans.

Historically, for power roof ventilators, most specifying engineers probably opted for a belt-driven fan. Why? Relatively easy fan speed adjustment for final balancing, economical first cost, and ... well ... habit; belt-driven fans have been a good choice for decades and in some situations are still a good alternative.

With the recent development of Greenheck's Vari-Green motors, however, Greenheck's Vari-Green direct drive fans are becoming much more popular than belt drive fans. Fans equipped with a Vari-Green motor are even easier to speed adjust than belt drive fans. They are also extremely more efficient, require less maintenance, and have about the same first cost. Let's take a closer look ...

Here we have two fans of the same size, design and aerodynamic performance. One is a standard belt drive configuration and the other features the Greenheck Vari-Green motor. Let's focus on the energy consumption, measured in Watts, of these two fans. At the high end of the speed range, 1725 R P M, the belt drive fan consumes 410 Watts of electricity, while the Vari-Green fan draws only 240 Watts. That's a 42% reduction in energy usage! This difference can be attributed to two things: the higher efficiency of the Vari-Green motor and the losses of the belt and pulley drive components. The savings are even more dramatic at lower speeds. After the fan speed adjustments have been made to 1120 RPM, notice the Vari-green motor consumes 66 Watts and the belt drive fan consumes 210 Watts; an amazing 68% energy savings!

On top of the huge energy savings, the Vari-Green motor has an extremely broad range of speeds - from full speed down to 20% of full speed. With a belt drive fan, you would need to purchase additional belts and pulleys to have the same speed range.

And, did you notice how easy it is to change the speed of the Vari-Green fan? Simply adjust the dial and it's done! Another Vari-Green speed adjustment option is a 0-10V signal for remote speed control. This allows the fan to be used in a demand controlled ventilation system, without the added cost of a variable frequency drive!

The benefits of a direct drive fan with a Vari-Green E C motor over a belt drive fan are pretty obvious for many applications. They provide significant energy savings, make speed adjustment even easier, and virtually eliminate fan maintenance. While belt-drive fans still have merit for certain applications, and may be the only option in some fan models, when given a choice, you'll probably prefer the many advantages of a direct drive fan with a Vari-Green motor for your next project. And remember, Greenheck offers a wide variety of Vari-Green E C motors to choose from.

[stevenkim]

My name is Steven and I attended you zoom meeting yesterday at SFSU. It was very informative. Thank you for your time and knowledge. I will smash that like button too.

[outofcontrol]

Hmm... if both spin at the same RPM does that necessarily mean they're moving the same amount of air? I don't doubt that the ECM fan is more efficient but the analysis seems dubious

[tubazo]

Watt is the unit used to measure Power. Joule is the unit used to measure Energy/Work!