Tunnel Geothermal Cooling Fan

According to Article 22 of the "Regulations for the Implementation of the Mine Safety Law" (Ministry of Labor Order No. 4) promulgated and implemented on October 30, 1996: "The air temperature at the underground work site for workers shall not exceed 28°C. If exceeded, cooling or other protective measures shall be taken."

When railways, highways, and subways are constructed in tunnels in southern China, the temperature inside the tunnel culverts can sometimes reach 42 degrees. In response to market demand, our company has developed a tunnel cooling fan to address the issue of excessively high temperatures in mines and tunnels that prevent workers from operating. It allows construction personnel to enjoy an air conditioning system akin to that in office buildings.

Tunnel Geothermal Cooling Fan utilizes evaporative cooling with a compressor, featuring no water usage, long air delivery distance, high air volume, and adjustable temperatures from -30°C to 30°C (customizable according to user requirements). It ensures uniform temperature distribution in enclosed spaces and includes filtration functions, creating a comfortable indoor environment with high oxygen levels and fresh air. During normal operation, it automatically shuts off when the reduced temperature meets the required space temperature and restarts when the temperature rises above the set point. The machine is energy-efficient and environmentally friendly, capable of rapid cooling (with dehumidification effects), ventilation, air exchange, odor removal, dust prevention, and heatstroke protection. It offers significant advantages such as improved worker efficiency, energy savings, reduced investment, quick installation, and easy maintenance.

Shenzhen Hongchuan Machinery Equipment Co., Ltd. is a manufacturer specializing in the research, development, production, and sales of refrigeration equipment and temperature-humidity control devices. This includes chillers, cooling fans, dehumidifiers, constant temperature and humidity machines, oil temperature controllers, and cold oil machines (circulating cooling water/oil/fans). The company provides integrated professional solutions for temperature and humidity control, covering design, installation, after-sales service, and maintenance.

Development and application of refrigeration technology in engineering tunnel cooling: Modern refrigeration technology emerged as a discipline in the mid-to-late 19th century. Its application in underground excavation cooling projects began in the 1920s but saw rapid development and widespread use after the 1970s. Overall, artificial cooling technologies can be divided into water cooling systems and ice cooling systems. Water cooling systems involve underground air conditioning technology but are costly, utilizing compression refrigerators with Freon as the refrigerant for artificial cooling inside tunnels. Ice cooling systems, on the other hand, involve spreading ice produced by ice machines onto work surfaces, achieving cooling through ice-water phase change heat exchange, though the cooling process is relatively slow. China's first ground-based centralized cooling air conditioning system adopted various refrigeration and cooling techniques, with certain theoretical and practical foundations in full-tunnel cooling and local refrigeration units. However, establishing localized centralized cooling methods remains underexplored in domestic and international research, and the issue of condensing heat discharge requires further study. Tunnel excavation faces generally have long durations, with significant variations in cooling delivery distance, electromechanical equipment, ventilation volume, and groundwater inflow. Cooling process designs must be tailored to specific tunnel face excavation progress, geological conditions, wind exposure, and equipment to economically and effectively address heat hazards while minimizing impact on production. China has conducted extensive research on tunnel refrigeration cooling theory and technology, achieving certain cooling effects. However, issues such as suboptimal cooling performance remain prominent challenges in long-tunnel cooling. Drawing on years of refrigeration experience and collaboration with numerous university research institutions and engineering companies, Hongchuan has developed a cooling fan that solves the major problem of workers being unable to operate normally due to geological overheating during the construction of long tunnels in mines, highways, railways, subways, etc.

Working Principle

Based on the refrigeration system principle, low-temperature, low-pressure liquid refrigerant undergoes heat exchange with surrounding water in the evaporator. The evaporator absorbs heat from the water, causing the refrigerant to evaporate into a low-temperature, low-pressure gaseous state. During evaporation, the refrigerant temperature remains unchanged. The low-temperature, low-pressure gaseous refrigerant then enters the compressor, where it is compressed into a high-temperature, high-pressure gaseous state. It subsequently moves into the condenser, where it exchanges heat with the indoor medium. Part of the heat from the high-temperature, high-pressure gaseous refrigerant is absorbed by the medium, raising its temperature, while the refrigerant releases heat and condenses into a high-temperature, high-pressure liquid in the condenser, with the temperature remaining constant during this process. The refrigerant then passes through an expansion valve for throttling, a rapid cooling process that turns it into a low-temperature, low-pressure liquid. This refrigerant re-enters the evaporator for heat exchange and evaporation, completing the refrigeration cycle. This cycle continues uninterrupted to provide consistent cooling. The cooled air is then delivered to the required work surface via a fan through the air outlet.

Tunnel Geothermal Cooling Fan Selection

Tunnel geothermal cooling fans are divided into split-type and integrated units. Split-type units are suitable for space cooling, installed similarly to household air conditioners, with the condenser mounted outdoors and the main unit indoors. Tunnel cooling typically uses integrated units, with the refrigeration main unit placed in the middle section of the tunnel, 100-150 meters from the worker's operation face. An insulated air duct equipped with a booster fan ensures that the temperature and air volume from the cooling fan are maintained. The heat from the cooling fan's condenser is dissipated outside the tunnel via an exhaust fan, providing fresh air. Other spaces can also be configured for recirculated air.

Tunnel Geothermal Cooling Fan Features:

1. Scientifically designed, meticulously manufactured, and strictly quality-controlled, offering advantages such as attractive appearance, compact size, excellent performance, reliable quality, and reasonable pricing. Available in upward-blowing and downward-blowing models (specific outlet positions can be customized based on user requirements and application needs).

2. The fan uses imported high-quality components, scientifically selected with computer-aided software, ensuring high efficiency, low noise, and reliable performance. It guarantees air volume and pressure, with lithium-based grease lubricated bearings that require no routine lubrication during long-term operation.

3. Equipped with an air-cooled condenser, the heat exchanger features copper tubes with aluminum fins. The copper tubes are arranged in an equilateral staggered pattern, and the aluminum fins are double-curved corrugated. The tube holes are double-flared, and mechanical expansion ensures tight contact between copper tubes and fins, providing excellent heat transfer, low air resistance, and easy cleaning. Paired with high-quality condenser fans, it delivers high air volume, low noise, and outstanding performance. The air-cooled condenser is convenient to use and does not require an additional cooling tower.

4. The structure uses a combined sheet metal design, facilitating maintenance and internal cleaning. Heat dissipation holes are scientifically punched in the sheet metal based on the condenser fan's airflow direction, serving both cooling and aesthetic purposes.

6. Fully optimized technical parameters ensure advanced and reasonable performance metrics. Customized designs are available based on user requirements, offering products with different performance indicators.

Application Scope: Suitable for space cooling, tunnels, subways, food cooling and preservation, production line product cooling, and other industries.

After-Sales Service

All company equipment comes with a one-year warranty and lifetime maintenance (excluding human factors and consumables).

Upon receiving written equipment repair notification, response times are within 36 hours for locations within Guangdong Province and 72 hours for locations outside Guangdong Province for on-site repairs.