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16 Cards in this Set

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  • Back
1. What are the 2 most costly building services considering construction cost?

2. Elevators account for approximately ______ percent of a high-rise buildings energy usage.
1. HVAC, and elevators (~10% total initial construction cost)

2. 10%
1. Name 2 arrangements for placement of the bldg services.
2. What are benefits and uses of each?
1. In the core, or along east & west facades
2. Core: access to several tenants w/ shared facilities; core can be a shear wall for bracing lateral loads in steel superstructure.
Ends: Blocks sun to reduce heat gain; easy access to fresh air.
Name 2 main purposes of sky lobbies.
1. Reduce waiting time for elevator
2. Free up valuable leasable area from elevators.
Where is the elevator machine room located?
What are 3 components located in the machine room?
Typically located above elevator shaft.
Power supply,
Machine (traction motor)
What are the two moving parts of an elevator?

How heavy does the counterweight need to be?
Counterweight & Car

Car + 1/2 max load
What are 4 stationary parts of an elevator?
Car guide rails
Counterweight guide rails
Hydraulic buffer
What are 3 rope/sheave arrangements with traction sheave at top of bldg?

Which is for high-speed applications? Low power/cost?
1. 1:1 roping, single wrap
2. 1:1 roping, double wrap
3. 2:1 roping, double wrap

#1, #3
What are 4 attributes of hydraulic elevator systems?
Suitable for 2-6 stories,
Each elevator completes full run - highest to lowest call, or reverse.
System assigns which car answers call.
Name 4 types of elevator operations control.
1. Single automatic push button - pax decide order.
2. Selective collection op - stores calls, complete ^/v runs, option for peak modes to reduce wait.
3. Computerized system control - min wait & trip time; priority to expired calls, ID trends.
4. Destimation control - tell where you want to go. It groups people for efficiency; reduce stops & time.
Name 3 considerations for selecting elevator system.
1. Interval and average wait time
2. Handling capacity
3. Travel time
___________ is the avg time between departure of cars from lobby.
The average wait time is generally interval times ______%.

Interval of office bldgs? residential?


25-35 seconds, 50-120 seconds
What is the priority for selective collective & computerized operations control systems?
Destination control system?
Minimize interval.

Total travel time.
The percentage of total bldg population that can be handled in a given time period (typ 5 min) is ____________ ____________.

Elevator systems are designed for _________ traffic.
handling capacity

A key reason for placing the building services (including elevators) at the East and West facades is to block the glare and the heat associated with the afternoon sun.
What must an elevator system sacrifice if it takes advantage of 2:1 mechanical leverage in its roping and sheave arrangement?
Energy efficiency Initial cost
Speed Pax comfort None
While selective collective elevator systems target interval times, destination control systems seek to minimise "________ time".