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16 Cards in this Set
- Front
- 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% |
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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. |
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Name 2 main purposes of sky lobbies.
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1. Reduce waiting time for elevator
2. Free up valuable leasable area from elevators. |
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Where is the elevator machine room located?
What are 3 components located in the machine room? |
Typically located above elevator shaft.
Power supply, Controller, Machine (traction motor) |
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What are the two moving parts of an elevator?
How heavy does the counterweight need to be? |
Counterweight & Car
Car + 1/2 max load |
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What are 4 stationary parts of an elevator?
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Car guide rails
Counterweight guide rails Hydraulic buffer Shaft |
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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 |
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What are 4 attributes of hydraulic elevator systems?
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Suitable for 2-6 stories,
Slow. Each elevator completes full run - highest to lowest call, or reverse. System assigns which car answers call. |
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Name 4 types of elevator operations control.
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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. |
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Name 3 considerations for selecting elevator system.
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1. Interval and average wait time
2. Handling capacity 3. Travel time |
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___________ is the avg time between departure of cars from lobby.
The average wait time is generally interval times ______%. Interval of office bldgs? residential? |
Interval
60 25-35 seconds, 50-120 seconds |
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What is the priority for selective collective & computerized operations control systems?
Destination control system? |
Minimize interval.
Total travel time. |
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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
peak |
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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.
TRUE FALSE |
TRUE
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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 |
Speed
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While selective collective elevator systems target interval times, destination control systems seek to minimise "________ time".
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travel
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