In the profession of architectural and engineering design, the elevator quantity calculation represent critical processes that ensure optimal performance, efficiency, and safety. This comprehensive guide delves into the intricate methodologies of analyzing various conveying systems, providing insights into computational techniques, sizing strategies, and practical problem-solving approaches.
Standard Elevator Car Sizes (Based on Building Type)
Building Type | Typical Car Size (Width × Depth) | Passenger Capacity |
Residential (Low-Rise) | 5' × 4'4" (1.5m × 1.3m) | 4-6 persons |
Commercial (Office) | 6' × 5'3" (1.8m × 1.6m) | 8-10 persons |
Hospital/Healthcare | 6'8" × 5'7" (2.0m × 1.7m) | 10-12 persons |
High-Rise Commercial | 7' × 6' (2.1m × 1.8m) | 12-15 persons |
Elevator Quantity Calculation Methodology
Calculation Method
Key Factors for Determining Number of Elevators:
Number of Storey
Total Population
Peak Traffic Period
Weight Capacity Determination
Weight Calculation Methodology
Average Human Weight Considerations
Standardized Weight Calculation
Total Weight Capacity = (Number of Persons × Average Weight) × Safety Factor
Elevator Category | Persons | Average Weight | Safety Factor |
Small Residential | 4-6 | 175 lbs | 1.5 |
Standard Commercial | 8-10 | 175 lbs | 1.5 |
Large Commercial/Industrial | 12-15 | 175 lbs | 1.5 |
Practical Example Calculation
Sample Problem: Elevator Calculation for a New Office Building
Project Details:
Building: 15-story office building
Floor occupancy: 50 people per floor
Total building occupancy= 15 x 50 =750 people
Peak traffic period: Morning arrival/Afternoon Departure (7:30 AM - 9:00 AM) or (4:30 PM to 6:00 PM)= 1.5 hours
Elevator Capacity Calculation:
Population Analysis
Total building occupants: 750 people
Peak traffic period occupants: Approximately 80% of 750 people = 600 people
Elevator Capacity Determination
Large Commercial elevator capacity: 12-15 people
Assumed capacity: 15 people per elevator
Assumed weight capacity= 15 people x 175 lbs x 1.5 safety factor= 3,983 lbs.
Elevator Quantity Calculation
Peak traffic arrival time: 1.5 hours (7:30 AM - 9:00 AM)
Elevator trips per hour: 4-5 trips
Elevator handling capacity per hour: 15 people × 5 trips = 75 people per elevator per hour
Number of Elevators Needed
Minimum number of elevators: 600 people ÷ 75 = 8 elevators
Recommendation: (This depends on the designer's assessment/analysis)
3 high-speed main elevators
2 standard speed elevators
2 service/freight elevators
1 backup/auxiliary elevators
Additional Considerations:
Ensure mix of express and local service elevators
Include at least one dedicated emergency/firefighter elevator
Comply with local building codes
Consider energy efficiency and smart elevator technologies
Recommended Sources from Amazon -Click to Order
The Vertical Transportation Handbook 4th Edition
by George R. Strakosch (Editor), Robert S. Caporale
ASME A17.1-2016: Safety Code for Elevators and Escalators: Includes Requirements for Elevators, Escalators, Dumbwaiters, Moving Walks, Material Lifts, and Dumbwaiters With Automatic Transfer Devices by The American Society of Mechanical Engineers
2024 International Fire Code (International Code Council Series) 1st Edition
Important Disclaimer:
The sample calculations provided are generalized professional estimates. For precise calculations, I strongly recommend:
Consulting a professional vertical transportation engineer
Using specialized elevator design software
Conducting a detailed traffic study specific to your building
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