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QUESTION: Dear Prof Scott

http://en.wikipedia.org/wiki/Uninterruptible_power_supply

https://en.wikipedia.org/wiki/Elevator

Can Uninterruptible Power Supply (UPS) provide a battery backup for Elevators / Lifts in case the mains power goes up ?.

Awaiting your reply,

Thanks & Regards,

Prashant S Akerkar

ANSWER: In most elevators, when the power goes out, the elevator will return to the ground floor and open the doors. Once this is done, the elevator turns off. To put in a power supply to handle the elevators when the main power goes out would require an enormous power supply system. That is because elevators require a vast amount of energy.

If most buildings, when the power goes out, they have a back up system where only a minimal amount of lights are kept on. This is because to keep all of the lights on would require too much power. Since elevators require even more power that just lights, an backup generator would be too big and cost too much money at the current time.

---------- FOLLOW-UP ----------

QUESTION: Dear Prof Scott

Thank you.

http://thyssenkruppelevator.com/webapps/energy-calculator/

1. Is it possible to use more than One UPS in series or parallel after computing the elevator power consumption ?.

http://www.zbattery.com/Connecting-Batteries-in-Series-or-Parallel

http://answers.yahoo.com/question/index?qid=20081023103102AAzJSAp

http://www.dutchforce.com/~eforum/index.php?s=fb8a29e07086c52ec4e9550903c8b0f0&s

http://www.youtube.com/watch?v=wdgq1-o1_8g

http://www.dslreports.com/forum/r19257711-building-a-super-UPS

http://sabmatic.co/battery-configuration-choices-to-optimise-ups-reliability/

a. When the mains supply goes, the elevator will come to ground floor for the people to exit / come out of the lift.

b. The Elevator will continue working for specific INTERVAL - hours depending upon the UPS Batteries power output. The UPS Batteries will be charged from AC Mains supply once the power is restored.

c. Elevator controls will indicate to the people inside the elevator using Alarms or LED Blinking that the elevator is using the UPS Battery Backup power and also indicating the Battery Backup time remaining for the Lift Operational. For example : 3 Hours remaining, with a decrements counter

in Hours:Minutes:Seconds.

http://pmw.sourceforge.net/doc/TimeCounter.html

2. Can this be possible to implement within Elevator electronic panel controls ?.

Awaiting your reply,

Thanks & Regards,

Prashant S Akerkar

From what I have seen, to do this for an elevator would take a massive power supply and doing so would drain the batteries quite fast. Perhaps the batteries could be put down below. In this way, the elevator would not have to lift them, but a massive cable would be needed. However, even this would put to much excess weight on the elevator.

The way technology is going, however, they might be able to transmit power through the air at some point in time. If this could be done on the PC, a small computer could be put on the elevator with a fairly large emergency computer to transmit it power down below.

PCs can be hooked together without and wires, but to to hook physical force still requires something between them.'

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Comment | Dear Prof Scott Thank you. Thanks & Regards, Prashant S Akerkar |

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Answers by Expert:

I can answer any question in general math, arithetic, discret math, algebra, box problems, geometry, filling a tank with water, trigonometry, pre-calculus, linear algebra, complex mathematics, probability, statistics, and most of anything else that relates to math. I can also say that I broke 5 minutes for a mile, which is over 12 mph, but is that relevant?

Experience in the area; I have tutored people in the above areas of mathematics for over two years in AllExperts.com. I have tutored people here and there in mathematics since before I received a BS degree back in 1984. In just two more years, I received an MS degree as well, but more on that later.
I tutored at OSU in the math center for all six years I was there. Most students offering assistance were juniors, seniors, or graduate students. I was allowed to tutor as a freshman.
I tutored at Mathnasium for well over a year.
I worked at The Boeing Company for over 5 years.
I received an MS degreee in Mathematics from Oregon State Univeristy.
The classes I took were over 100 hours of upper division credits in mathematical courses such as
calculus, statistics, probabilty, linear algrebra, powers, linear regression, matrices, and more.
I graduated with honors in both my BS and MS degrees.
Past/Present Clients: College Students at Oregon State University, various math people since college,
over 7,500 people on the PC from the US and rest the world.
**Publications**

My master's paper was published in the OSU journal.
The subject of it was Numerical Analysis used in shock waves and rarefaction fans.
It dealt with discontinuities that arose over time.
They were solved using the Leap Frog method.
That method was used and improvements of it were shown.
The improvements were by Enquist-Osher, Godunov, and Lax-Wendroff.
**Education/Credentials**

Master of Science at OSU with high honors in mathematics.
Bachelor of Science at OSU with high honors in mathematical sciences.
This degree involved mathematics, statistics, and computer science.
I also took sophmore level physics and chemistry while I was attending college.
On the side I took raquetball, but that's still not relevant.
**Awards and Honors**

I earned high honors in both my BS degree and MS degree from Oregon State.
I was in near the top in most of my classes. In several classes in mathematics, I was first.
In a class of over 100 students, I was always one of the first ones to complete the test.
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