Replace the damaged belt with new, identical belting.
Likely requires a single groove sheave vs multi groove sheave. Reduces initial expense by reducing the component costs: single-groove sheaves and only one V-belt.
Currently, about 60% of installed belt drives are wrapped. Instead of changing out like-for-like, a complete redesign that incorporates notched style belts can reduce cost, maximize efficiency, and optimize performance.
At a Los Angeles, California healthcare facility, facility owners faced an aging fleet of HVAC equipment. Worn sheaves, worn belts, and under-tensioned belts meant HVAC systems were operating well below efficiency.
Redesigning the drive can take advantage of that increased power potential and downsize the number of belts required.
IN ELECTRICITY COSTS
Commercial HVAC applications are being designed around increased efficiency gains and lowered energy consumption.
RECOMMENDED: EVERY 3 MONTHS
Replacing a wrapped V-belt with the equivalent notched V-belt typically provides 30-40% greater horsepower transmitting capabilities.
Commercial building energy usage accounts for*:
Reduced maintenance labor time, per unit, per year, due to installing a self-tensioning motor base
KEEPING IN SHAPE
Are about 2%-3% more efficient than the more standard wrapped V-belts
for all HVAC equipment
WHAT ARE OUTDATED HVAC BELT DRIVES COSTING YOU?
A more efficient V-belt drive saves electricity every month of the product’s lifecycle.
PUTTING IT INTO PRACTICE
2. Replace worn sheaves.
• property management groups
FOUR EASY STEPS to energy responsibility
Notched v-belts can run
up to 98% efficient
1. Upgrade from wrapped to notched belts and improve efficiency.
IMMEDIATE 50% reduction in cost of drive components
due to the reduction in the number of belts and the number of grooves in the sheave
Through a monitoring system on the drive, energy consumption data: real energy, real power, motor speed, and fan speed was recorded, analyzed, and presented to the customer, alongside the cost of the optimized belt drive.
Energy costs dropped by $7,700 annually
due to the gain in efficiency
Groove wear greater than 1/32-inch indicates replacement is needed. Belt should never ride in bottom of groove. Inspect for breaks on flange.
V-BELT DRIVES CONSIST OF...
Extended belt life: 12 to 36 months
BROUGHT TO YOU BY
When sheaves are significantly worn, V-belts can’t properly engage the sheave grooves. This causes:
One or several V-belts
BROUGHT TO YOU BY
HOWEVER>>> Under less than ideal conditions, the actual efficiency can be reduced by
Based on $0.12/kWh, 18 hours/day, 7 days/week, a single 100 hp belt driven application that drops from 98% to 95% in efficiency adds:
Of belt driven equipment, there are 2 typical types of belts: WRAPPED AND NOTCHED
Research suggests that about 50% of the fans in use will not comply with the new federal regulations and will need to be upgraded or replaced
Energy losses from under-tensioned drives can be up to 20% based on industry published information from 2013.
Using the wrong components can decrease drive efficiency by as much as 10%!
Belt drives need to be retensioned to operate at
peak efficiency and minimize the potential for slip and subsequent premature failure.
Notched belts typically transmit over 30% more horsepower than wrapped belts.
V-belt drives are required to transmit rotational motion. They’re often thought of as accessory items to a primary piece of equipment.
DON'T REPAIR: REDESIGN
A MAINTENANCE TECHNICIAN is replacing a worn-out, two-groove V-belt drive on an exhaust fan.
HALF of all commercial buildings were constructed before
THAT MEANS THAT BY SIMPLY REPAIRING AGING EQUIPMENT, YOU END UP WITH
Decreased bearing hub load: 7% which means bearing life is extended, due to less sheave weight and fewer belts
Peak power transmission capability under ideal conditions:
elevated V-belt temperatures
Use an “optimized” (properly chosen) V-belt drive solution.
With a horizontal sliding motor base, belt drive efficiency is increased by automatically maintaining belt tension for extended periods, allows for quick belt changes and maximizes belt life. Plus, it completely eliminates the need for re-tensioning.
A DRIVING FORCE
HVACR uses 50% of all energy in U.S. commercial buildings
CAN CONSERVE ENERGY
FOR COMMERCIAL HVAC
This can lead to bulky, “over-belted” drive. And, thanks to advancements in product design, a more efficient and torque-dense drive package most likely exists.
BELT DRIVES are the means of mechanical power transmissions for over 80% of commercial HVAC equipment.
*According to EIA’s 2012 annual energy outlook
V-BELT DRIVE EFFICIENCY IMPROVES when slip is minimized
to adapt the sheaves to varying shaft sizes
An HVAC unit was selected as a test unit. The existing belt was analyzed, and an “optimized” drive was selected. The optimized V-belt drive solution with single groove vs. multi groove sheave and notched v-belts so fewer belts were required.
3. Properly tension belts.
Mass retrofits of HVAC system belt drives can save money for:
Facility owners considered a mass retrofit of all belt drives. But first, they required proof of energy savings to justify the cost.
EFFICIENCY ON THE RISE
Reduced annual energy costs: $700 per unit, per year based on expected 3% efficiency gain by switching from wrapped to notched style belts
Wrapped v-belts can run up to 95% efficient
Replacement part savings: $3,036 from optimized 2-groove 5VX section versus original 4-groove C section
Decrease in maintenance requirements
due to the drive quality
Total payback period 16 MONTHS
4. Install a self-adjusting motor base.
glazed belt due to under tensioning