This project is located in the Beijing Tianjin Hebei region, which is the largest and most dynamic core area of the economy in northern China. The region belongs to a temperate monsoon climate, with high temperatures and humidity in summer, extreme temperatures reaching over 40 ℃, and frequent hot and humid weather, which places extremely high demands on ventilation and heat dissipation in large working environments. As an important national air cargo hub, this cargo terminal not only undertakes core tasks such as efficient sorting, inspection and quarantine, loading and unloading of air cargo within and outside the region, but also serves as an important node in China's air logistics system, playing a key role in supporting the construction of the "Air Silk Road" and enhancing international air cargo capacity. With the continuous increase in China's total air cargo volume and the continuous expansion of its international influence, the standardization and humanization of the operating environment have become important considerations for the construction of modern freight hubs.

The main building of the international cargo terminal and express distribution center is a large-span steel structure shed structure, with a total area of over 20000 square meters and a height of about 17 meters. The high and empty design meets the operational needs of large security inspection equipment, lifting platform vehicles and other facilities, and the wide span provides efficient access guarantee for freight shuttle vehicles. However, this tall and open spatial structure is prone to the accumulation of hot air in summer, coupled with the limited thermal insulation performance of building envelope structures, and the widespread problem of high temperature and stuffiness in internal work areas. This not only affects the working status and health safety of frontline workers, but also hinders the stability of the cargo handling environment. Therefore, there is an urgent need to achieve overall improvement in spatial airflow through scientifically reasonable ventilation and cooling methods.

In response to the characteristics of the project, such as large space, high altitude, and the need for comprehensive airflow coverage without precise temperature control, the designers of Ruifeng Plan have comprehensively considered multiple key factors: firstly, the high temperature and stuffy weather in the Beijing Tianjin Hebei region during summer, and the ventilation system must be able to effectively cope with long-term high load operation; Secondly, the warehouse area is extremely large and the floor height is extremely high, resulting in high costs, high energy consumption, and limited operational effectiveness of traditional air conditioning equipment; Thirdly, there are no strict requirements for temperature and humidity during the turnover of goods. The focus of cooling is on improving human comfort through airflow organization, rather than precise temperature control; Fourthly, the personnel and equipment in the work area are dense, and the airflow distribution needs to balance uniformity and safety. Based on the above analysis, the design team selected permanent magnet industrial ceiling fans as the core equipment, scientifically proportioned and reasonably distributed according to the coverage area of different types of fan blades, and achieved full area coverage. This type of ceiling fan adopts a permanent magnet synchronous outer rotor motor direct drive structure, which eliminates mechanical transmission components compared to traditional gearbox drive methods. It has outstanding advantages such as small size, high efficiency, and maintenance free, and is particularly suitable for use in tall spaces with limited long-term operation and maintenance conditions. The fan blade adopts a combination design of wing shape and energy-saving tail wing, combined with the principles of biomimetic fluid dynamics and aerodynamics, which can drive a large amount of air to flow radially along the ground at low speeds, achieving a coverage area of up to 2000 square meters, while reducing energy consumption by more than 35% compared to traditional ceiling fans, fully reflecting the design concept of "high efficiency, energy saving, and directional coverage".

The physical principle of permanent magnet industrial ceiling fans is to use large diameter fan blades to rotate at low speed, driving a large area of three-dimensional natural wind field with minimal energy consumption, evenly compressing the accumulated cold air in the upper part of the building, and forming effective convection with the ground hot air, thus constructing a continuous "natural wind" circulation system in the space. After the equipment is put into use, the air flow inside the warehouse of the cargo terminal is significantly enhanced, the temperature gradient in the operation area is reduced, and the phenomenon of humid and hot retention is significantly alleviated. Frontline operators reported a significant decrease in perceived temperature, reduced fatigue from long-term work, and significant improvements in work efficiency and comfort. At the same time, due to the smooth operation and low noise of the equipment, it does not affect the normal operation and scheduling command of the work area.

The air cargo hub distribution center project undertaken by Ruifeng Company this time is not only a successful practice of applying permanent magnet industrial ceiling fans in super tall spaces, but also further verifies the wide applicability of this solution in various scenarios such as logistics warehousing, industrial plants, sports venues, exhibition centers, etc., which have the characteristics of "high space, large span, and optimized airflow". Through this project, Ruifeng Company has further demonstrated its professional ability in comprehensive equipment selection and scheme design under the requirements of super tall special spaces and special industries. It can accurately match project needs and provide customers with efficient, reliable, and energy-saving ventilation and cooling solutions.