FAQ

In an open circuit cooling tower, the cooling water contacts the air directly and is cooled by evaporative heat dissipation; it has a simple structure and high heat exchange efficiency, making it suitable for most industrial and commercial scenarios. A closed circuit cooling tower has an internal cooling coil through which the cooled medium flows without directly contacting the air, and heat is removed by evaporation of the spray water outside the coil. Closed circuit cooling towers keep the medium free from contamination, making them suitable for applications with high water quality requirements, such as data center liquid cooling systems and precision manufacturing process cooling. The Lanxun LMB series closed circuit cooling tower is CTI certified, with reliable media isolation performance.

Choosing a cooling tower model requires comprehensive consideration of: ① cooling water flow rate (m³/h); ② inlet/outlet water temperature (e.g. 37℃→32℃); ③ local wet-bulb temperature (℃); ④ installation site conditions; ⑤ noise control requirements; ⑥ water quality conditions; ⑦ special needs such as freeze protection and anti-plume. We recommend contacting the Lanxun technical team; based on your actual operating conditions, we will use our in-house CTI thermal calculation software to provide a precise selection plan.

Key parameters include: ① cooling water circulation rate (m³/h); ② inlet and outlet water temperature (℃); ③ design wet-bulb temperature (local meteorological parameters of the project site); ④ installation method (indoor/outdoor/rooftop); ⑤ available installation space dimensions (length × width × height limits); ⑥ power supply conditions (voltage/frequency); ⑦ noise limits (dB(A)); ⑧ special functional needs such as water saving, plume abatement and freeze protection. Lanxun provides a selection form; once completed, we can issue a selection report within 24 hours.

Inlet and outlet water temperatures are the core parameters of cooling tower design. For conventional air-conditioning conditions, the typical values are 37℃ inlet → 32℃ outlet, corresponding to a 5℃ temperature difference; industrial conditions can reach a 10~15℃ difference or even higher. The approach (the difference between outlet water temperature and wet-bulb temperature) is generally designed at 4~5℃; a smaller approach saves more energy but requires a larger tower. The Lanxun PL series cooling tower for high-efficiency data centers can achieve an outlet water temperature approaching the wet-bulb temperature by as little as 3℃, with an energy efficiency ratio over 15% higher than the industry average.

Dry-wet combined cooling towers run in wet mode (spray evaporation) during hot summer periods and in dry mode (air cooling only) during the mild spring/autumn and cold winter periods, greatly reducing water consumption and visible plume. They are especially suitable for: ① water-scarce regions; ② sites with strict plume requirements; ③ climate zones with large day-night temperature differences; ④ year-round energy-saving projects. Both the Lanxun LMB-WD and LXWD series adopt dry-wet combined technology, achieving annual water savings of 40%-60%.

Cross-flow tower — air flows horizontally across the fill while water falls vertically. Advantages: low profile, ample maintenance space, low air resistance and low motor power; disadvantage: a relatively larger footprint. Counter-flow tower — air passes upward through the fill while water flows downward. Advantages: higher heat exchange efficiency, smaller footprint, and suitability for large temperature-difference conditions; disadvantages: a taller tower and slightly more noise. Lanxun's full product range covers both cross-flow and counter-flow structures and can recommend the optimal solution based on your actual installation conditions.

Yes. Lanxun offers a full range of solutions for data centers, from open circuit to closed circuit and from conventional cooling to free cooling: ① the PL series cooling tower for high-efficiency data centers — lowers chilled water temperature and improves chiller efficiency; ② the LAD series isenthalpic adiabatic cooling unit — dry-wet hybrid mode, ultimate water saving, effectively reducing PUE to below 1.3; ③ the PL-IE series indirect evaporative cooler — suitable for large data centers, making full use of natural cooling sources. More than 50 data center projects in China have adopted Lanxun cooling solutions.

CTI (Cooling Technology Institute) certification is the most authoritative third-party thermal performance certification in the global cooling tower industry. Obtaining CTI certification means a product's thermal performance has been verified by an independent laboratory with authentic and reliable data. Lanxun is one of the few Chinese cooling tower manufacturers with CTI certification; several flagship products, such as the PL, HMK and LMB series, are CTI certified and compete on equal footing with American manufacturers in thermal performance.

Lanxun products have obtained the following international authoritative certifications: ① CTI certification (thermal performance certification by the Cooling Technology Institute); ② FM certification (Factory Mutual certification, for projects with fire protection requirements); ③ UL certification (Underwriters Laboratories safety certification); ④ CE certification (mandatory EU safety certification, qualifying for export to the EU). In addition, they have passed CQC China energy-saving certification and CQC China water-saving certification, two national-level certifications.

Yes. Several Lanxun cooling tower products have passed CQC (China Quality Certification Centre) energy-saving and water-saving certification. Products with CQC energy-saving certification have energy efficiency indicators more than 15% better than the national standard, and products with CQC water-saving certification control drift loss below 0.001% of the circulating water volume, far better than the national standard. CQC certification information can be verified on the official website of the Certification and Accreditation Administration of China.

Lanxun holds the following major enterprise qualifications: ① National Specialized and Innovative "Key Little Giant" Enterprise (certified by MIIT); ② National High-Tech Enterprise; ③ Guangdong Manufacturing Single Champion Enterprise; ④ Guangdong Top 500 Manufacturing Enterprises (No.376); ⑤ Trademark listed in the Guangdong Key Trademark Protection List; ⑥ Guangdong Provincial Engineering Technology Research Center; ⑦ Provincial Enterprise Technology Center; ⑧ Guangdong Provincial Doctoral Innovation Station; ⑨ Quality Rating AAA; ⑩ Carbon footprint certification; ⑪ Five-star after-sales service certification; ⑫ Intellectual property management system certification.

Lanxun's water-saving and plume abatement technology uses a dual-path design: inside the cooling tower there are dry and wet heat exchange sections. In the wet section, spray water contacts the air to complete the main heat dissipation; in the dry section, the saturated humid hot air leaving the wet section exchanges sensible heat with the external dry cold air through a heat exchanger, and the water vapor in the humid air condenses and is recovered on the heat exchange surface. This process simultaneously: ① recovers evaporated water vapor, with a water-saving rate of 30%-50%; ② eliminates visible plume (white mist), meeting urban landscape and environmental requirements. The Lanxun HMK dual-path anti-plume series has been successfully applied in several densely populated city-center projects.

Traditional cooling towers still operate at rated flow under partial load, wasting energy. Lanxun's variable-flow energy-saving technology monitors the cooling water temperature and outdoor wet-bulb temperature in real time and intelligently adjusts the fan speed and spray water volume, so that the tower's operating parameters precisely match the actual load demand. Under partial-load conditions (which cover most of the operating time), fan power consumption can be reduced according to the cube relationship of the flow ratio, achieving a comprehensive power-saving rate of 30%-50%. This technology is built into the Lanxun intelligent control system.

Isenthalpic adiabatic cooling means that, before the air enters the cooling coil, it is first humidified and cooled by spray water (an adiabatic humidification process), lowering the temperature and raising the relative humidity of the air entering the coil, thereby increasing the heat exchange temperature difference and cooling capacity. The LAD series isenthalpic adiabatic cooling unit can lower the inlet air temperature by 6-8℃ during hot summer periods, enabling the unit to maintain stable cooling capacity in hot weather. This technology is especially suitable for data centers, greatly reducing mechanical refrigeration operating time and lowering PUE.

In its high-end cooling tower series, Lanxun uses permanent magnet direct-drive motors instead of the conventional asynchronous motor plus reducer solution, with clear advantages: ① high efficiency — permanent magnet synchronous motors can reach efficiencies above 95%, 8-12 percentage points higher than asynchronous motors; ② maintenance-free — the reducer and belt drive are eliminated, with no mechanical wear parts; ③ precise speed control — stepless speed regulation with a frequency converter, meeting variable-flow energy-saving needs; ④ low noise — the direct-drive structure reduces transmission noise; ⑤ long life — a design life of over 15 years. Both the Lanxun PL and HRN series can be equipped with permanent magnet direct-drive motors.

Lanxun cooling towers are equipped with multiple anti-freeze measures: ① intelligent anti-freeze control — when the outlet water temperature drops to the set safe value, it automatically reduces the fan speed or stops the fan and increases the hot water bypass flow; ② electric heat tracing — self-regulating heat tracing cables are laid on the water collection basin and inlet/outlet water pipes; ③ dry operation mode — dry-wet combined towers switch to full-dry mode in winter; ④ the LMB-RB series is equipped with an anti-freeze coil design, suitable for severe cold regions. The combined anti-freeze solution ensures normal equipment operation in extreme -40℃ environments.

Noise control: ① use low-noise fans and permanent magnet direct-drive motors to reduce mechanical noise; ② fit inlet or outlet silencers, which can reduce noise by 3-8 dB(A); ③ choose ultra-quiet cooling towers, with noise as low as 58 dB(A) at 1 meter from the tower; ④ reduce propagated noise with enclosures or green sound-absorbing barriers. Drift control: Lanxun uses a three-stage drift eliminator, controlling drift loss below 0.001% of the circulating water volume (the national standard requires 0.005%), saving water while reducing icing and white mist in the surrounding environment.

Lanxun's after-sales service covers six major systems: ① equipment installation — professional on-site installation and commissioning; ② maintenance and repair — regular inspection, preventive maintenance and troubleshooting; ③ equipment retrofit — energy-saving upgrades, old tower renovation and control system upgrades; ④ testing and assessment — thermal performance testing, structural safety assessment and water quality testing; ⑤ spare parts supply — ample stock of genuine parts, with common parts shipped within 48 hours; ⑥ technical training — operation training, maintenance training and system optimization guidance. 50+ offices nationwide ensure service coverage.

Lanxun promises a 24-hour response mechanism: after receiving a service request, customer service staff confirm by phone within 1 hour and arrange for a technical service engineer to arrive on site within 24 hours (48 hours in remote areas). In emergency breakdowns, the nearest office can be coordinated for an emergency response within 12 hours. Lanxun has an 800+ after-sales service team covering six major regions nationwide, ensuring no blind spots. 24-hour service hotline: +86 20 86449968.

Lanxun offers an industry-leading warranty policy: ① within the whole-unit warranty period (as agreed in the contract, generally 12-24 months), equipment failures not caused by human factors are repaired or replaced free of charge; ② the warranty period for key components (fan, motor, gear reducer) can be extended to 3 years; ③ after the warranty period, parts are supplied for life and repair service is provided for life; ④ during the warranty period, at least one free inspection and maintenance service per year. The above specific terms are subject to the contract.

Lanxun has a large spare parts warehouse at its Zhaoqing headquarters, ensuring ample stock of common wear parts (fill, drift eliminator, nozzle, belt, bearing, etc.), shipped within 48 hours after ordering. Regional offices also stock common parts, and some needs can be delivered within 24 hours. For parts of discontinued models, Lanxun retains the molds and process documents and can custom-produce on demand. Lanxun guarantees that all parts are genuine factory parts with assured quality.

Lanxun's equipment installation process: ① on-site survey — technical staff measure the installation site on site and confirm the foundation conditions and hoisting access; ② installation plan — issue an installation construction plan and schedule; ③ foundation work — assist or guide the customer in completing the tower foundation and pipe embedment; ④ equipment positioning — a professional hoisting team completes lifting and positioning; ⑤ piping connection — complete the inlet/outlet water pipes, makeup water pipe, overflow pipe, etc.; ⑥ electrical wiring — complete the wiring of motors, sensors and control cabinets; ⑦ commissioning and acceptance — start-up trial run, performance testing, operation training and signing of the acceptance report. The whole process is supervised by Lanxun certified engineers.

Lanxun Technology was founded in 1999, evolving from the Guangzhou Lanxun Cooling Tower Factory established in 1997, and now has nearly three decades of deep expertise in cooling tower R&D, manufacturing and service. It has grown from a small factory of a dozen people to an industry leader with 436 employees, 4 production bases and 126,000 m² of factory space.

Lanxun has 4 production bases, all located in Zhaoqing High-Tech Zone (Dawang), Guangdong Province: ① Plant 1: No.12 Wende 4th Street, Zhaoqing High-Tech Zone; ② Plant 2: No.39 Yingbin Avenue, Zhaoqing High-Tech Zone; ③ Plant 3: No.41 Yingbin Avenue, Zhaoqing High-Tech Zone; ④ Plant 4: No.37 Jiangjun Street, Zhaoqing High-Tech Zone. The four factories cover a total site area of over 200 mu, with an annual capacity of tens of thousands of cooling towers, making it one of the largest cooling tower manufacturing clusters in China.

Lanxun is a leading enterprise in China's cooling tower industry. The Cooling Tower Branch of the China General Industrial Association has recognized Lanxun as having the No.1 nationwide market share in commercial cooling towers for five consecutive years. Lanxun is a National Specialized and Innovative "Key Little Giant" Enterprise and a Guangdong Manufacturing Single Champion Enterprise, ranking among the top three in China's cooling tower industry overall. Lanxun products are exported to overseas markets such as France, Vietnam, Indonesia, Thailand and Malaysia.

Lanxun is a core member of the National Cooling Tower Standardization Technical Committee and has participated in the formulation of 11 national standards and 28 industry standards, including: "Mechanical Draft Cooling Towers Part 1", "Mechanical Draft Cooling Towers Part 2", "Energy-Saving Monitoring of Cooling Towers", "Technical Specification for Water Turbines for Cooling Towers" and other important standards. In addition, Lanxun participated in drafting industry guidance documents such as the "Technical White Paper on Cooling Towers for Data Centers".

Lanxun has accumulated 152 patents (300+ including controlled subsidiaries), of which 34 are invention patents, covering core technology areas such as cooling tower energy saving, water saving, plume abatement, noise reduction and intelligent control. In 2019, Lanxun's in-house CTI thermal calculation software broke the decades-long U.S. technological monopoly in cooling tower thermal calculation, marking that China's cooling tower industry has gained fully independent core technological capability. Lanxun also has 5 in-house thermal calculation software packages and performance optimization platforms.

Lanxun has provided cooling solutions for more than 50 data center projects, covering government cloud, financial data, telecom operators, internet companies and other sectors. Typical projects include a large China Mobile data center (using the PL series plus free cooling, with PUE below 1.3), a provincial government cloud data center (LAD adiabatic unit solution), and several third-party IDC facilities (closed circuit tower plus Free Cooling solution). Lanxun's data center cooling solution can utilize natural cooling sources for over 80% of the year.

Lanxun adheres to a "technology-driven enterprise" strategy, with annual R&D investment accounting for over 6% of sales revenue, more than twice the industry average. The company has built three major R&D platforms: a Provincial Engineering Technology Research Center, a Provincial Enterprise Technology Center and a Doctoral Innovation Station, and owns the world's largest cooling tower thermal performance testing platform at 8,000 kW. The R&D team has nearly 100 people, spanning multidisciplinary backgrounds including HVAC, thermal engineering, fluid mechanics and mechatronics.

Lanxun products are exported to Southeast Asia, Europe, the Middle East and other regions. The company has 7 overseas service offices in France (Issy-les-Moulineaux), Vietnam (Ho Chi Minh City/Hanoi), Indonesia (Jakarta), Thailand (Chonburi) and Malaysia (Kuala Lumpur), and plans to further expand into the North American market. With CTI/FM/UL/CE international certifications, Lanxun products have obtained global market access.