Analysis of Construction Technical Key Points: Foundational Theory and Regulatory Framework
The analysis of construction technical key points is a foundational task in hotel MEP engineering design. In the field of hotel MEP engineering, the analysis of construction technical key points involves a multi-level system of technical standards and codes. Taking GB 50736 "Design Code for Heating Ventilation and Air Conditioning of Civil Buildings" as an example, this code specifies the basic parameter requirements for HVAC system design, including indoor design temperature, humidity, fresh air volume and other fundamental indicators. Hotel guest rooms typically require a summer temperature of 24-26°C and relative humidity of 50%-60%, and a winter temperature of 20-22°C and relative humidity of 40%-50%. Regarding fresh air volume, five-star hotel guest rooms should achieve a fresh air supply of 50 m³ per person per hour in accordance with Article 3.0.2 of GB 50736. In addition, GB 50189 "Design Standard for Energy Efficiency of Public Buildings" imposes higher thermal performance requirements on the energy-efficient design of hotel buildings, such as limits on the heat transfer coefficient of the building envelope, window-to-wall ratio control, and airtightness grade. GB 50016 "Code for Fire Protection Design of Buildings" imposes mandatory requirements on the fire protection design of MEP systems, including smoke control zone division, smoke exhaust system design, and fire protection distribution line selection. In high-end international brand hotel projects, it is also necessary to simultaneously satisfy owner technical specifications such as Marriott International MIDS standards, Hilton HQS standards, or InterContinental IHC standards; these owner standards typically impose more stringent performance requirements on top of national codes. For example, the Marriott MIDS standard requires guest room fresh air volume of no less than 54 m³/h·person, higher than the national standard of 50 m³/h·person; LEED certification requires hotel projects to achieve at least 20% energy savings in energy consumption compared with the ASHRAE 90.1 baseline building. Therefore, the analysis of construction technical key points in hotel MEP engineering first requires the establishment of a multi-level, multi-standard composite regulatory framework system.
Analysis of Construction Technical Key Points: Analysis of Key Technical Points
In hotel MEP engineering practice, the analysis of construction technical key points involves technical key points across multiple critical dimensions. Taking HVAC systems as an example, core technical parameters include cooling and heating load indicators, system energy efficiency ratio, hydraulic balance, and supply-return air temperature difference. Article 5.2.1 of GB 50189 specifies the minimum energy efficiency requirements for chillers, such as a COP of no less than 5.6 for centrifugal units with a rated cooling capacity greater than 1,163 kW. However, in actual engineering, because five-star hotels operate for long hours throughout the year and have a high proportion of part-load operation (typically exceeding 70%), the system coefficient of performance (SCOP) is the more critical assessment indicator. The calculation method for SCOP is: SCOP = annual cumulative cooling capacity / annual cumulative power consumption (including chillers + pumps + cooling towers). According to research data from the China Academy of Building Research, the industry benchmark value of SCOP for HVAC systems in domestic five-star hotels is 4.0-4.5, and the advanced level can reach 5.5-6.5. The key technical measures for achieving high SCOP include: adopting variable frequency drive technology (all pumps, fans, and cooling towers variable frequency), optimizing control strategies (pre-cooling control based on load prediction, optimal reset of cooling water temperature), and selecting high-efficiency equipment (Grade 1 energy efficiency or higher). In plumbing systems, key technical parameters include water use quota, water supply pressure, drainage pipe diameter and slope, etc. GB 50015 "Code for Design of Building Water Supply and Drainage" specifies a hotel guest room water use quota of 250-400 L/bed·day, but in actual design the specific value must be determined according to the hotel star rating and operating model. Because five-star hotels have high-water-use facilities such as SPA, swimming pools, and laundry rooms, actual water consumption is typically in the range of 500-800 L/bed·day. Regarding water supply system design, the flow and head selection of domestic water pumps must consider the water use requirements at the most unfavorable point; typically, the outlet pressure at the most unfavorable point in hotel guest rooms is no less than 0.15 MPa, and the pressure fluctuation of the municipal water supply inlet pipe should be between 0.25-0.45 MPa.
Analysis of Construction Technical Key Points: Practical Engineering Application Cases
Applying the analysis of construction technical key points to actual hotel MEP engineering projects requires customized design based on the specific project conditions and owner requirements. Taking the MEP engineering of a newly built five-star hotel as an example, the project is located in a hot summer and cold winter zone, with a building area of 45,000 m² and 350 guest rooms. In the application of the analysis of construction technical key points, the team focused on the following aspects: First, determination of the load calculation method. DesignBuilder software was used for annual dynamic load simulation to replace traditional estimation methods or indicator methods. The simulation results showed a design cooling load of 4,800 kW, while the traditional indicator method (estimated at 120 W/m²) produced a result of 5,400 kW, a difference of 12.5%. The use of dynamic simulation can avoid initial investment waste and part-load efficiency degradation caused by overconfiguration. Second, system scheme comparison and selection. Three cooling and heating source schemes were compared: water-cooled centrifugal + boiler, air-cooled heat pump, and ground source heat pump. Through technical and economic analysis, the water-cooled centrifugal + boiler scheme had the lowest initial investment (approximately 6.8 million yuan), but its 10-year life cycle cost (including operating costs and maintenance costs) was close to that of the ground source heat pump scheme (initial investment 9.5 million yuan). Ultimately, combined with site conditions and Marriott MIDS standard requirements, the water-cooled centrifugal + boiler scheme was adopted. Third, equipment selection optimization. According to the dynamic load distribution curve, the chiller configuration was adjusted from the originally planned 4 centrifugal units (1,350 kW each) to 3 centrifugal units (1,600 kW each), reducing the number of units, improving single-unit efficiency, and saving approximately 40 m² of plant room area. Fourth, system control strategy design. A fuzzy PID control algorithm based on load prediction was adopted to optimize the chilled water supply temperature reset strategy and cooling water temperature setpoint optimization, which is expected to improve the system's comprehensive energy efficiency by approximately 8%-12%.
Analysis of Construction Technical Key Points: Development Trends and Optimization Directions
With technological advances and the continuous improvement of industry standards, the analysis of construction technology key points in hotel MEP engineering shows the following development trends: First, the level of digitalization and intelligence continues to rise. MEP system design and O&M platforms based on Digital Twin technology have begun to be applied in high-end hotel projects, enabling virtual verification of system operating performance during the design phase. The China Academy of Building Research, together with Huawei, released the "White Paper on Digital Twin Technology for Building MEP Systems," proposing the use of sensor data to drive BIM models for real-time mapping between the physical and digital worlds. Second, low-carbon and energy-saving requirements continue to increase. The "General Code for Energy Efficiency and Renewable Energy Utilization in Buildings" (GB 55015-2021) issued by the Ministry of Housing and Urban-Rural Development mandates that the carbon emission intensity of new public buildings be reduced by more than 40% compared with the 2016 baseline. As a high-energy-consumption building type (energy consumption per unit area is typically 2-3 times that of ordinary office buildings), hotels face greater pressure to reduce carbon emissions. Future analysis of construction technology key points needs to incorporate full life-cycle carbon footprint analysis into design considerations. Third, demand for health and comfort is upgrading. After the COVID-19 pandemic, hotel guests' attention to indoor air quality (IAQ) has increased significantly. The "Several Opinions on Accelerating the Development of New Building Industrialization," jointly issued by the Ministry of Industry and Information Technology and other ministries and commissions, proposes promoting technologies such as air purification, fresh air systems, and indoor environment monitoring. The analysis of hotel construction technology key points should focus on fresh air system HEPA filtration efficiency (MERV 13 or above), installation of ultraviolet germicidal devices, and CO₂ concentration monitoring with linked control. Fourth, balancing standardization and customization. The technical standards of international hotel brands (such as Marriott MIDS 2023 Edition, Hilton HQS V5, etc.) are continuously updated, imposing increasingly higher performance requirements on MEP systems. Excellent analysis of construction technology key points needs to be optimized and adjusted based on meeting brand standards while taking into account project climate characteristics, local regulatory requirements, and the owner's investment budget.