A five-star hotel in Sanya with 300 guest rooms, including 1 presidential suite, and a banquet hall of 800 m² with a height of 7 m. There are 5 meeting rooms of 60 m² each, and an ADD restaurant with 100 seats. The lobby on the first floor is 2,000 m², with the reception desk located on the first floor. The lobby bar is also located on the first floor.

A five-star hotel in Sanya with 300 guest rooms, including 1 presidential suite, and a banquet hall of 800 m² with a height of 7 m. There are 5 meeting rooms of 60 m² each, and an ADD restaurant with 100 seats. The lobby on the first floor is 2,000 m², with the reception desk located on the first floor. The lobby bar is also located on the first floor.

You have provided very complete project information. From the perspective of an MEP director, I will systematically review the key control points across all disciplines for your Sanya five-star hotel (300 guestrooms, including 1 presidential suite, an 800㎡/7m ballroom, 5 meeting rooms of 60㎡ each, a 100-seat ADD restaurant, and a 2000㎡ lobby and lobby bar). Sanya is in a hot summer and warm winter zone with high humidity, high salt spray, and strong typhoons; these climatic characteristics run through all disciplines, and I will highlight them below.

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I. First, clarify several qualitative judgments that affect the overall project

1. Building classification: A five-star hotel with 300 guestrooms and an 800㎡ ballroom can basically be determined to be a Class I high-rise public building (height most likely >50m), and fire protection shall comply with the strictest requirements of GB 50016-2014 (2018 edition).
2. The ballroom is the largest MEP challenge in this project: 800㎡ with a clear height of 7m, it is a large space involving smoke exhaust, air distribution, lighting, acoustics, fire water monitors, and other multidisciplinary interfaces, and performance-based or special justification must be carried out.
3. Sanya climate: air conditioning provides cooling year-round with no heating, but dehumidification is the core issue; outdoor equipment, piping, and cable trays must be designed for C5-M corrosion protection (high salt spray).
4. Presidential suite: independent fresh air, independent hot water, independent power distribution, and independent control, designed to a "hotel-within-a-hotel" standard.

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II. HVAC discipline (the top priority of this project)

1. Cooling source scheme

• For 300 guestrooms plus banquet and food and beverage, the estimated air-conditioning cooling load is about 2800~3500 kW (about 800~1000 RT).
• It is recommended to use 2 centrifugal chillers (or magnetic bearing chillers) + 1 screw chiller or 3 magnetic bearing units; magnetic bearing units have high part-load efficiency and suit the large day-night load fluctuations of hotels.
• Heat recovery units must be provided: although Sanya does not need heating, the domestic hot water load is huge; using condenser heat recovery to produce domestic hot water can achieve an energy saving rate of more than 30% (according to Section 4.2 of GB 50189-2015 *Design Standard for Energy Efficiency of Public Buildings*).
• Cooling towers shall be designed for a wet-bulb temperature of 28℃; pay attention to typhoon and salt spray protection, and select one size larger.

2. Dehumidification (core issue in Sanya)

• Guestrooms, the ballroom, and the ADD restaurant must have independent fresh air dehumidification and cannot rely solely on fan coil units.
• Fresh air handling units shall adopt dual-cold-source deep dehumidification or desiccant wheel dehumidification, with supply air dew point controlled at ≤12℃ to prevent condensation and mold.
• The ballroom is densely occupied; the fresh air volume shall be calculated at 30 m³/(h·person) (GB 50736-2012). For 800㎡, estimated at 1.5 persons/㎡ for banquet use, about 1200 people, the fresh air volume is huge, and dedicated fresh air handling units are required.

3. Ballroom air distribution

• With a clear height of 7m, stratified air conditioning is recommended: supply air to the lower 2.5m occupied zone and treat the upper space less, achieving significant energy savings.
• Air supply method: swirl diffusers + side supply nozzles or task air supply, avoiding direct overhead supply.
• Smoke exhaust: for the 800㎡ large space according to Section 8.5 of GB 50016, natural smoke exhaust or mechanical smoke exhaust requires special calculation; FDS smoke simulation is recommended (refer to the experience of Guangzhou Hotel G).

III. Electrical discipline

1. Load classification

• Fire protection loads, the ballroom, the presidential suite, elevators, and ELV equipment rooms are Class I loads, with dual power supplies + diesel generator (GB 50052-2009).
• Generator capacity shall be calculated based on essential loads; ≥800kW is recommended. Pay attention to generator exhaust and the fuel oil storage room arranged in accordance with fire protection requirements.

2. Illuminance standards (according to GB 50034-2013 and JGJ 62-2014)

• All shall use LED + intelligent dimming, with a comprehensive energy saving rate of ≥30%.
• Scene control shall be provided in the ballroom and lobby (welcome/banquet/meeting/cleaning/night).

3. Power distribution and lightning protection/earthing

• Sanya has a high thunderstorm day count; design according to Class II lightning protection (Class I if height >50m), with graded SPD installation.
• Due to seaside salt spray, cable trays, distribution boxes, and luminaire housings all require anti-corrosion treatment (hot-dip galvanizing + powder coating or stainless steel).

IV. Plumbing and drainage discipline

1. Domestic hot water (key point in Sanya)

• For 300 guestrooms plus the presidential suite, estimated at 140L/day per room, the daily hot water consumption is about 45~50 tons.
• A central hot water system + condenser heat recovery is recommended, with storage tank volume based on 1.5 hours of peak consumption.
• The pipe network shall use reverse-return supply + circulating return to ensure instant hot water (five-star requirement: hot water within ≤5 seconds).

2. Drainage

• The slope of drainage branch pipes in public restrooms shall comply with Article 4.4.6 of GB 50015-2019: 0.035 for DN50, 0.025 for DN75, and 0.020 for DN100.
• Grease interceptors must be provided for the kitchen and ADD restaurant; the ballroom kitchen shall be treated separately.

3. Swimming pool/SPA (if any)

• Sanya hotels usually have swimming pools, requiring circulating filtration + disinfection + constant temperature; pay attention to corrosion protection of equipment in the salt spray environment.

V. Fire protection discipline (key to acceptance success)

1. Ballroom (the biggest challenge)

• 800㎡ and 7m high, exceeding the limit for a single fire compartment (for Class I high-rise buildings, each fire compartment is ≤1500㎡, but the ballroom is usually a separate compartment), requiring fire separation + independent smoke exhaust.
• Performance-based fire design is recommended, using FDS to verify smoke exhaust effectiveness (refer to the successful experience of Guangzhou Hotel G).
• Sprinklers shall be designed for Medium Hazard Class II; the large space may require fire water monitors or a large-space intelligent fire extinguishing system.

2. Evacuation

• Evacuation corridor width: Class I high-rise ≥1.20m (GB 50016 Clause 5.5.18).
• Safety exit clear width ≥0.90m; total clear width of ground-floor exterior doors ≥1.20m.
• Banquet halls and meeting rooms are densely occupied; evacuation distance and number of exits require dedicated calculation.

3. Fire Acceptance (Sanya Local Requirements)

• Sanya is in Hainan; fire acceptance follows the Hainan Province Implementation Rules, some requirements stricter than national standards (e.g., fire elevator lobby ≥10㎡, pump room evacuation door ≤15m).
• Recommend preparing a fire design special section + third-party review in advance to avoid rectification at acceptance.

VI. Extra-Low Voltage & Intelligent Systems

• Guest Room Control System (RCU): Presidential suite independently controlled; lighting/AC/curtains/call integrated.
• Banquet Hall AV: Reserve interfaces for LED large screen, sound reinforcement, simultaneous interpretation, stage lighting; conduit embedded in place.
• BA System: Centralized monitoring of cooling/heating sources, AC, plumbing, lighting; energy-efficient operation.
• Wireless Coverage: Full WiFi coverage in lobby, banquet hall, guest rooms; banquet hall designed for high density (≥1AP/50 people).
• Security: Key surveillance at lobby, elevators, banquet hall, presidential suite.

VII. Elevator Discipline

Per JGJ 62-2014 and industry experience:

• 300 guest rooms: no fewer than 4 passenger elevators; recommend 4 passenger + 2 service elevators.
• Capacity: 5-star recommendation 1600kg (21 persons).
• Speed: based on building height; 2.5m/s for 16-25 floors.
• Presidential suite may consider dedicated elevator or card-access direct.
• Service elevator capacity 2000-2500kg; car sized for linen carts and food carts (≥1800×2000mm).
• 5-minute handling capacity ≥12-15%, waiting time ≤30 seconds (5-star standard).

VIII. Fit-Out Coordination (MEP & Decoration Interface)

• Banquet Hall: Integrated layout of ductwork, sprinklers, smoke detectors, luminaires, speakers, projection within ceiling; BIM first to avoid clashes.
• Lobby: 2000㎡; luminaires, air outlets, sprinklers, smoke detectors must align with decorative features; concealed sprinklers.
• Guest Rooms: Bedside control panel, sockets, USB, lighting integrated with furniture design.
• ADD Restaurant: Open-kitchen exhaust, make-up air, gas alarm (if gas used) coordinated with decoration.

IX. Summary of Sanya Special Requirements

| Item | Requirement |
|---|---|
| Corrosion protection | Outdoor equipment, cable trays, piping to C5-M grade |
| Typhoon protection | Cooling towers, rooftop equipment, signage reinforced |
| Lightning protection | Class II and above, graded SPD |
| Dehumidification | Deep dehumidification of fresh air, dew point ≤12℃ |
| Hot water | Condensate heat recovery, energy-efficient |
| Fire protection | Hainan Province Implementation Rules apply |

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X. Decision Recommendations

1. Launch BIM MEP coordination immediately, especially banquet hall, lobby, plant rooms — key to cost control and schedule.
2. Performance-based fire design for banquet hall; engage Sanya fire authority early to avoid acceptance risk.
3. Finalize cooling source + heat recovery scheme early — affects plant room area, electrical capacity, investment.
4. Conduct elevator traffic analysis; for 300 guest rooms recommend 4 passenger + 2 service, dedicated for presidential suite.
5. Fire design special section + third-party review, referencing Guangzhou G Hotel's first-pass experience.

If needed, I can provide detailed schemes for banquet hall MEP special, cooling source comparison, performance-based fire design, or elevator traffic calculation. Please first tell me the project's building height, number of floors, whether there is a pool/SPA, and whether the kitchen uses gas, and I will refine further.