29 replies to this topic

[Duck]

Right! That's why a detachable may not give a higher capacity than a fixed grip lift with the same number of people per carrier, but the time to the top if the line speed is faster should be reduced. In theory slowing the chairs in the terminal should mean that closer spacing is okay since it's easier to load each chair.

-Iain

[highspeedquad]

I think that something about the fact that it is detachable gives HSQs the ability to go to a higher capacity, up to about 2800 pph, while I believe that FGQs can only stay at 2400 pph.

[Duck]

(3600 / time interval in seconds between chairs) * capacity per chair = lift hourly capacity.

[highspeedquad]

So for some of the HSQs that have a capacity of more than 2400 pph they just shorten the time between the chair? I would think it would work differently, or is there another method besides shortening the interval?

[Duck]

Hourly Capacity is defined as the theoretical maximum number of people in one hour who can pass through a given system.

Number of people you can move in one hour = number of people per chair x number of chairs per hour passing by a given point

On a quad, there are 4 people per chair.

Think of it like this: A city has two subway lines. One line uses 2-car trains, the other uses 6-car trains.

On the 2-car line, trains come every 4 minutes. On the 6-car line, trains come every 12 minutes.

Each car can hold 200 passengers.

The line capacity per hour per direction for each line is as follows:

No. trains per hour x number of people per train

So for the first line:

60 minutes / 4 minutes= 15 trains per hour
15 trains x 400 people per train = 6 000 people per hour per direction

Second line:

60 minutes / 12 minutes = 5 trains per hour
5 trains x 1200 peope per train = 6 000 people per hour per direction


So, even though the interval between trains is dramatically different, because there are more people on the 6-car line, the capacities are equal. It doesn't matter if one train is going 50 km/h and the other is going 80 km/h, because the time interval defines the overall maximum capacity.

Headways are shortned during rush periods on subway systems to increase the capacity of the system. Amusement parks will run more trains on a coaster if the crowds warant it. Wal Mart will open more cash registers if people start to form a huge line up behind the few registers that are open.

The only way you will change the capacity of a lift without changing the number of chairs on it is to increase the line speed (which would decrease the amount of time between each chair passing through the terminals). If you keep the line speed constant, the only way to change the capacity is to modify the number of chairs (and their spacing) on the rope.

-Iain

This post has been edited by Duck: 28 February 2005 - 03:06 PM

[liftmech]

Well put. I think you've explained the issue better than I was trying to.

[highspeedquad]

That adds more light to the situation. So pretty much you just have to shorten the time between chairs, whether it means adding carriers or speeding up the lift.

This post has been edited by highspeedquad: 01 March 2005 - 03:08 PM

[Duck]

No, you shorten the physical distance between chairs, which means that for the same rope speed, you have more chairs passing by a given point in a given time interval. Or, leave the physical distance the same, and speed up the rope. (I think that's maybe what you were trying to say anyway)

-Iain

This post has been edited by Duck: 01 March 2005 - 09:39 AM

[highspeedquad]

Yes, that was what I meant to say. I edited my post because what I said didn't make sense.

[Duck]

Haha, score.

-Iain