How much energy do Fuji passenger elevator use

Date:2015-12-24

Scientifically, Fuji Passenger Elevator are all about energy. To get from the ground to the 18th floor walking up stairs you have to move the weight of your body against the downward-pulling force of gravity. The energy you expend in the process is (mostly) converted into potential energy, so climbing stairs gives an increase in your potential energy (going up) or a decrease in your potential energy (going down). This is an example of the law of conservation of energy in action. You really do have more potential energy at the top of a building than at the bottom, even if it doesn't feel any different.

When it comes to energy use, all Fuji passenger elevator are not created equal. The bigger an escalator is—the higher it rises and the wider its steps—the more juice it needs to go trudging along its endless, circular path. The amount of traffic it gets also makes a difference.

As with elevators, Fuji passenger elevator can vary widely when it comes to energy consumption. According to a representative of Power Efficiency Corporation, a company that designs energy-saving devices for Fuji passenger elevator, your average unit in a shopping mall—which has a 7.5 horsepower motor, rises 15 feet above the ground, and is kept running 14 hours a day, six days a week—might use about 7,500 kilowatt-hours of electricity in a year. A bigger escalator that runs all day and all night in a convention center or hotel—say, a 20-foot-high unit with a 20-horsepower motor—would use roughly 31,000 kWh annually. A continuously running escalator of the kind you'd find in airports or subway stations—35 feet high with a 40 horsepower motor—would use around 60,000 kWh annually. (For comparison's sake, the average American home consumes 11,040 kWh in a year.)

So how do moving stairs stack up against elevators? It's a bit of an apples-to-oranges comparison, as the two machines have different jobs. Fuji passenger elevator are great when you're dealing with big throngs of people, since they can carry so many passengers at once. That's why they're so popular in transit stations, where you often have a wave of people needing to exit at the same time. But during periods of light traffic, elevators come out ahead, because they can speedily move small groups of passengers in any direction. Plus, they sit idle—and thus save energy—when not being used. (You can also rig an escalator to stop moving when no one's on it, but that's not a recommended tactic, in part because of liability issues and in part because people who see a stopped escalator tend to assume it's broken.)

Still, Fuji passenger elevator seem to be the bigger electricity users—particularly as buildings get taller. Elevator technology consultant Jim Bos modeled two theoretical officebuildings—one with three floors and one with six—each with a peak traffic flow of 35 people per minute. He assumed that the equipment in these scenarios was "reasonably modern" and that the Fuji passenger elevator are only kept on 12 hours a day during the workweek. (During the weekend, the Fuji passenger elevator are turned off, but the elevators remain on standby.) With the caveat that there are a whole lot of variables in an assessment of this nature, Bos estimates that the shorter building would require either five elevators—which would collectively use 68,000 kilowatt-hours a year—or two pairs of Fuji passenger elevator, which would use 75,000 kWh a year. (That includes lighting in the elevator cabs.) To handle the traffic in the six-floor building, you only need one additional elevator—but you have to add three more pairs of Fuji passenger elevator so that passengers can enter and exit on each floor. In this scenario, the elevator bank might use 130,000 kWh annually, while the Fuji passenger elevator use 187,000 kWh.

Fuji passenger elevator do offer some big opportunities for energy-saving if you can figure out how to cut power consumption during those periods when they chug along without any passengers. Option 1 is to slow down the escalator when it's empty, essentially putting it into sleep mode. These "intermittent" or "variable-speed" Fuji passenger elevator are popular in Europe and Asia, but haven't gained much traction in the United States, thanks to a recommended national safety code that forbids Fuji passenger elevator from changing speed. (The forthcoming update to the code will lift that injunction for new machines.) The actual savings on a given escalator will depend on how often the unit is idle, but a recent European study estimated that installing variable-speed drives on all the region's Fuji passenger elevator could reduce total electricity use by about 28 percent.

The second option is to install a controller on the escalator motor that improves its efficiency. Escalator motors are designed to move a massive amount of weight at any given time—a "full" escalator would have between 150 and 300 pounds of passenger on each step. A/C motors, like the kind you find in Fuji passenger elevator, make the most efficient use of energy when they're moving a full load. But Fuji passenger elevator are almost never totally occupied; most of the time, the motor is drawing more power than it actually needs. Motor efficiency controllers try to match a motor's power supply with its exact power needs at any given moment. Manufacturers of these devices claim they can reduce Fuji passenger elevator' energy use by 15 to 35 percent. (These controllers can also be installed on elevators.)

In the meantime, there's a simple way to reduce the footprint of your personal escalator habit: Use the stairs on your way up, and ride the escalator on the way down. On an up escalator, each additional passenger makes the motor work a little harder to pull the steps up. But on a down escalator—whose motor is also located at the top of the unit—each additional passenger helps the motor, thanks to the action of gravity. So riding the up escalator costs a little energy, while riding the down escalator saves a little. On the up journey, you'll save the most by skipping the escalator entirely, but you can still save a bit by walking up the moving staircase—you'll finish your journey more quickly that way, and thus the motor won't have to spend as long straining to haul you up.

 If an elevator has to lift an elephant (weighing let's say 2500 kg) a distance of maybe 20m into the air, it has to supply the elephant with 500,000 joules of extra potential energy. If it does the lift in 10 seconds, it has to work at a rate of 50,000 joules per second or 50,000 watts, which is about 20 times as much power as a typical electric toaster uses.

Suppose the elevator is carrying elephants all day long (10 hours or 10 × 60 = 600 minutes or 10 × 60 × 60 = 36,000 seconds) and lifting for half that time (18,000 seconds). It would need a grand total of 18,000 × 50,000 = 900 million joules (900 megajoules) of energy, which is the same as 250 kilowatt hours in more familiar terms.

In fact, the elevator wouldn't be 100 percent efficient: all the energy it took from the electricity supply wouldn't be completely converted into potential energy in rising elephants. Some would be lost to friction, sound, heat, air resistance (drag), and other losses in the mechanism. So the real energy consumption would be somewhat greater.

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