Core Code System for the HVAC Discipline
In hotel MEP design, the code system involved in the HVAC discipline is the most complex, and it is essential to master the three core codes GB 50736, GB 50189 and GB 50243. Article 3.0.2 of GB 50736 specifies the indoor thermal and humidity environment design parameters for civil buildings: for five-star hotel guest rooms, the summer temperature is 24-26℃ and relative humidity 40%-60%, and the winter temperature is 22-24℃ and relative humidity 30%-50%. Article 4.2.1 of GB 50189 sets mandatory limits for the thermal performance of hotel building envelopes. Section 7.2 of GB 50736 requires that chiller selection adopt the hourly load calculation method, and that the unit-area index method must not be used to replace detailed calculation. GB 50243 classifies duct air leakage testing standards into four levels, and hotel air-conditioning system ducts should meet the medium-pressure system standard. International brand hotels usually need to meet the minimum outdoor air requirements of ASHRAE Standard 62.1-2022, and the Marriott MIDS standard further requires guest room outdoor air volume of no less than 50m3/h·room.
Key Points of Codes for Electrical and Intelligent Systems
The core codes for the electrical discipline include GB 50052, GB 50054, GB 50034 and GB 51348. Article 3.0.2 of GB 50052 requires that the power supply load for five-star hotels be Grade I, with dual power supplies, and that particularly important loads be provided with an additional emergency diesel generator set. Article 5.2 of GB 50034 clearly specifies the illuminance standards for each functional area of a hotel: lobby illuminance 300lx, guest room illuminance 100-150lx, banquet hall illuminance 500lx. Section 7.2 of GB 51348 requires that hotels be provided with a building automation system (BAS), intelligent lighting control system, room control unit (RCU) and energy management system (EMS). Article 5.3 of GB 50314 classifies hotel building intelligent systems into Grades A, B and C, and five-star hotels should meet the Grade A standard. GB 50116 requires five-star hotels to be provided with a centralized alarm system.
Compilation of Codes for Plumbing and Fire Protection Disciplines
The core codes for the plumbing discipline include GB 50015, GB 50084 and GB 50974. Section 3.3 of GB 50015 requires that hotel domestic water supply systems be divided into vertical zones, and that the static water pressure at the lowest sanitary fixture outlet in each zone should not exceed 0.45MPa. For hot water systems, Article 6.2.2 of GB 50015 requires that the hotel hot water supply temperature be controlled at 55-60℃, and that a circulation pipe network be provided to ensure the water outlet time at draw-off points is no more than 10 seconds. Article 5.0.1 of GB 50084 specifies the sprinkler installation parameters for each hotel area: guest rooms use quick-response sprinklers with an operating temperature of 68℃, and kitchens use 93℃ high-temperature sprinklers. Article 3.2.2 of GB 50974 requires that the design flow rate of outdoor fire hydrants for hotel buildings be no less than 40L/s and that of indoor fire hydrants no less than 20L/s. Article 8.1.2 of GB 50016 requires that Class I high-rise public buildings must be provided with fire water tanks and fire pump rooms.
Principles for Code Coordination and Conflict Resolution
In the MEP design process, clause conflicts among multiple codes are often encountered, and the following resolution principles should be followed: First, the principle of priority of mandatory standards—the GB series are national mandatory standards; second, the principle of stringency—when different codes specify different values for the same parameter, the strictest requirement applies; third, the principle of additional international brand standards—standards of groups such as Marriott and Hilton are usually higher than national standards; fourth, the principle of priority of local standards—if the local standard where the project is located is higher than the national standard, the local standard shall prevail; fifth, the principle of special project acceptance. In code wording, "must" denotes mandatory clauses that are enforced without exception, "shall" denotes requirements to be implemented under normal conditions, and "should" denotes allowance for a certain degree of choice. Design documents should clearly indicate the clause numbers of the referenced codes to facilitate drawing review and construction disclosure.