Belt-driven fans are costly to run and have a high maintenance and replacement cycle. According to the US Environmental Protection Agency (EPA), upgrading from a v-belt to a Synchronous belt drive system can save at least five percent on your energy bills.
Conventional V-belts create a wedging action on pulleys, which in turn generates friction to transmit the load. Even a newly installed V-belt drive is only 93 percent efficient, requiring re-tensioning on a regular basis due to elongating. Poorly maintained and or floppy v-belt drives will reduce efficiency by over 10 percent, wasting time and energy.
A significant amount of energy and maintenance savings could be realized by improving the efficiency of these applications by upgrading to a Carbon GT Synchronous belt. These belts allow for virtually no stretch, don’t slip, and eliminate the need for re-tensioning.
Carbon GT Synchronous belt drives are a positive engagement system, which means they do not slip. No slip equates to no speed loss which saves energy. Carbon GT Synchronous belts have virtually no stretch and remain 98 percent efficient for their life. This reduces energy consumption while also reducing the need for maintenance.
Facility managers also realize the value of these improved efficiencies by maintain or meeting capacity demands while using less power!
Efficient drives = Energy savings
The following formula issued to determine kilowatt hours saved by switching to Synchronous belts:
Estimated Annual Savings in KWh = (Motor HP) (Hrs/Yr) (.746) (.05) / Motor Efficiency
NOTE: .746 is the conversion factor from hp to KW and .05 is the energy savings realized by converting to Synchronous Belt Drive
V-belts and Carbon GT Synchronous belts take about the same amount of time to install. But the benefits are much higher. Using synchronous belts eliminate nuisance of re-tensioning your belts, as well as quarterly replacements, increasing the up-time of your machine because your new belt will simply last longer.
Most systems operate on a VFD and a majority operate at 60Hz, continually. Utilizing your VFD to match mechanical fan speed could result in an additional 15 percent energy savings when used in conjunction with Carbon GT Synchronous belts.
Energy consumption in centrifugal fan applications follow the Affinity Laws, which state:
That means if a motor running a fan operates at 95 percent of rated speed, it only requires 85 percent of rated power.
Let’s look at a typical V-belt driven fan application:
Now, let’s look at a Carbon GT Synchronous belt drive:
The numbers are staggering when energy savings, maintenance savings and utilization of VFD are calculated for switching to the Carbon GT Synchronous belt platform.
And these savings will continue year after year!
Note: If your current system is operating via Soft-Start, you may want to consider upgrading to a VFD to capture additional energy savings! Please contact Rumsey for assistance.
For assistance designing your drives, please contact me at firstname.lastname@example.org