How are the number and capacity of guest elevators in a five-star hotel determined? Elevator configuration calculation method
I am Ethan Liu, an elevator specialist. The question you raised is central to hotel elevator system design and directly affects the hotel's operational efficiency, guest experience, and investment cost. Five-star hotels have extremely high requirements for elevator comfort, handling capacity, and response speed; improper configuration can lead to long guest waiting times, low service efficiency, and even affect the hotel's rating. Below I provide a detailed analysis from three levels: standards, calculation methods, and engineering practice.
1. Core Standard References
According to GB/T 7588.1-2020 "Safety Rules for the Construction and Installation of Lifts" and GB/T 10060-2011 "Code for Acceptance of Lift Installation", elevator configuration must meet safety, comfort, and handling capacity requirements. However, there is no absolute formula for the specific number and rated load; these must be determined comprehensively in combination with hotel scale, passenger flow, service standards (e.g., five-star hotels usually require peak-hour waiting time ≤30 seconds), and other factors. Commonly used industry reference standards include:
- JGJ 62-2014 "Code for Design of Hotel Buildings": When the number of guest rooms exceeds 100, it is recommended that the number of elevators be no fewer than 2, and the rated load of each elevator be no less than 1000 kg (13 persons).
- "Code for Fire Protection Design of Buildings" GB 50016-2014 (2018 Edition): Fire elevators must have a rated load of no less than 800 kg and be provided independently.
2. Elevator Configuration Calculation Methods
Five-star hotel passenger elevator configuration must consider two key indicators: 5-minute handling capacity and average waiting time (AWT).
(1) 5-Minute Handling Capacity Calculation
Formula:
\[
\text{5-minute handling capacity} = \frac{\text{Number of elevators} \times \text{Rated load per elevator (kg)} \times \text{Elevator speed (m/s)} \times 300}{\text{Average interval (seconds)}}
\]
However, in practice the passenger flow estimation method is more commonly used:
- Peak-hour passenger flow: Usually calculated as number of guest rooms × (1.5–2.0 persons/room) × (15%–20% peak usage rate). For example, for 300 guest rooms, peak-hour passenger flow ≈ 300 × 1.8 × 0.18 ≈ 97 persons.
- Capacity per elevator: Taking a rated load of 1600 kg (21 persons) and a speed of 2.5 m/s as an example, the theoretical capacity is about 120 persons/5 minutes (door opening/closing and acceleration/deceleration time must be deducted).
- Demand: 97 persons ÷ 120 persons ≈ 0.8 elevators, but considering redundancy and comfort, 2–3 elevators are usually configured.
(2) Average Waiting Time (AWT) Control
Five-star hotels require AWT ≤30 seconds. The calculation formula is:
\[
\text{AWT} = \frac{\text{Elevator round-trip time}}{\text{Number of elevators}}
\]
- Round-trip time ≈ 2 × (building height / elevator speed) + door opening/closing time (about 10 seconds/floor) + passenger boarding/alighting time (about 1.5 seconds/person).
- For example, for a 20-storey hotel with a floor height of 3.5 m and a total height of 70 m, at a speed of 2.5 m/s: round-trip time ≈ 2 × (70/2.5) + 20 × 10 + 20 × 1.5 × 21 ≈ 56 + 200 + 630 ≈ 886 seconds.
- If AWT ≤30 seconds is required, then the number of elevators must be ≥886/30 ≈ 30? This is obviously unreasonable. In practice, five-star hotels adopt zoning operation (e.g., low zone and high zone) and group control systems to keep AWT at 20–30 seconds. For example, 300 guest rooms are usually configured with 4–6 passenger elevators, divided into 2–3 zones.
(3) Rated Load Selection
- Standard passenger elevator: Rated load 1600 kg (21 persons) or 1350 kg (18 persons); the car dimensions must allow wheelchairs and luggage carts to enter and exit (width ≥1600 mm, depth ≥1400 mm).
- Service elevator/freight elevator: Rated load ≥2000 kg, used for transporting linen, food carts, equipment, etc.
- Fire elevator: Rated load ≥800 kg and must meet the requirements of GB 50016.
3. Engineering Experience and Cases
Case 1: A five-star hotel with 300 guest rooms, total height 22 storeys (including 2 basement levels), floor height 3.5 m.
- Configuration: 4 passenger elevators (2 for the low zone, floors 1–12; 2 for the high zone, floors 13–22), all with a rated load of 1600 kg and a speed of 2.5 m/s. 1 service elevator (2000 kg, speed 1.5 m/s). 1 fire elevator (1000 kg, speed 2.5 m/s).
- Acceptance result: Peak-hour AWT about 25 seconds; 5-minute handling capacity covers 98% of passenger flow.
- Lesson: The initial design had 3 passenger elevators; simulation showed AWT reached 45 seconds, and after adding 1 elevator it was optimized to 27 seconds.
- Configuration: 6 passenger elevators (rated load 1600 kg, speed 1.75 m/s), 2 service elevators (2500 kg).
- Optimization: Double-door elevators were adopted, with one side serving the guest room area and the other side serving the lobby area, reducing detour time.
- Result: AWT stabilized at 20 seconds.
4. Concluding Summary
For five-star hotels, it is recommended to provide 1 passenger elevator per 80–120 guest rooms (e.g., 3–5 elevators for 300 rooms), with 1600 kg as the main rated load, and the speed selected according to building height (1.75 m/s for ≤15 storeys, 2.5 m/s for 15–25 storeys, and 3.0 m/s or above for >25 storeys). Zoning, group control, and redundancy design must be combined to ensure AWT ≤30 seconds. Service elevators and fire elevators should be provided separately.
The above are reference opinions. The actual project situation still needs to be further evaluated and implemented in combination with specific operating conditions, site conditions, and other factors.