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Pros and Cons of Retrofitting Elevators for Energy Efficiency
July 6, 2015 -
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There are a number of pros and cons to retrofitting an elevator for energy efficiency. In most cases, it makes sense to consider energy efficient technologies when an elevator repair or modernization is already planned.
"I would say that you would never change out an elevator for the purpose of energy saving, but if you are changing elevators to increase dependability, reliability, (and) safety, or due to obsolete, unrepairable equipment, then you would certainly look at the different efficiencies of what (technology) is currently available," says Sheila Swett, executive director of the International Association of Elevator Consultants and owner of Swett & Associates.
After all, a modernization can easily hit six figures. The typical modernization consists of reconditioning the hoist machine and replacing many of the components of the elevator system, including the cars, controller, motor drive, door operator and related hardware, and the hoistway wiring, says Jay Popp, executive vice president, international, with Lerch Bates.
Popp notes that replacing, rather than reconditioning, the hoist machine can add up to $50,000 to $75,000 to the cost of each car, depending on the amount of reconditioning needed. It's difficult to recoup this investment on energy savings alone. So if the machine is in good shape, has been well-maintained, and needs only minor work to allow it to operate safely for another 10 to 15 years, it generally makes sense to retain and recondition it, he says. (With machines from before the 1960s, replacement generally is more cost-effective, Popp adds.)
Another consideration: If the drive is replaced, the computer controls almost always need to be replaced as well, Popp says. Otherwise, it's unlikely the software in one piece of equipment will be able to communicate with the other.
Moreover, elevator modernization can take nearly a year, including time to develop and review the design drawings, and manufacture and ship the equipment. During that period, the elevator will be out of commission for about 15 to 16 weeks.
Today’s tip comes from Karen Kroll.