LMB-RB Series Counter-Flow Dry-Wet Closed Cooling TowerCounter-Flow Closed Circuit
A counter-flow dry-wet closed cooling tower with coil closed-loop circulation and counter-flow heat exchange.
The LMB-RB series is the core counter-flow closed cooling tower line of LANXUN, using counter-flow coil closed-loop heat exchange technology. Compared with cross-flow closed towers, the coils in a counter-flow closed tower are arranged vertically; the spray water flows downward while air flows upward over the coil surface to form a counter-flow water-film heat exchange, achieving higher unit-volume heat exchange efficiency and a smaller footprint. Covering 20 standard models from 16 to 1750m³/h, it spans everything from miniature laboratory towers to large industrial closed systems. The anti-freeze design includes an automatic drain valve, an antifreeze filling port, and low-temperature automatic switching to dry operation, ensuring safe year-round operation in northern regions.
Key Highlights
Closed Loop, Absolute Isolation
The coil is sealed in circulation, with the medium never contacting air or spray water, eliminating pollution, oxidation, and scaling risks.
Counter-Flow Heat Exchange, Efficient and Compact
The counter-flow structure maximizes coil-area utilization, reducing volume by 20%–25% compared to cross-flow closed towers at the same heat exchange rate.
Anti-Freeze Design
Standard automatic drain valve and low-temperature protection program; automatically drains or switches to dry operation below zero, eliminating freeze-crack risks.
Wide Coverage (16–1750m³/h)
20 standard models cover the full range from small laboratories to large industry, supporting multi-tower parallel expansion for greater capacity.
Working Principle and Structural Features
The following content is excerpted from the LMB-RB Series Counter-Flow Dry-Wet Closed Cooling Tower product manual
Working Principle
The LMB-RB series cooling tower cools the fluid inside the coil by absorbing the heat of the fluid flowing inside the coil when part of the spray water outside the coil evaporates. The spray water is delivered by the spray pump from the collection tank to the spray pipe at the top of the unit and sprayed through nozzles onto the outer surface of the cooling coil to form a very thin water film; part of the water in the film absorbs heat and evaporates into vapor, while the rest falls into the collection tank, and the spray water is circulated for reuse.
The axial fan forces air in from the lower part of the side wall to flow past the coil, while the saturated hot humid air is discharged into the surrounding atmosphere; part of the water droplets entrained in the hot humid air is intercepted by the drift eliminator, effectively controlling droplet drift loss, with a spray water drift rate of less than 0.001%, and the vapor lost to the atmosphere is replenished in the system under float-valve control.
The LMB-RB series cooling tower is shipped as a single module; apart from external piping, electrical connections, and required optional items, it basically requires no on-site assembly. Unit capacity is controlled by fan motor start/stop or variable frequency drive (VFD): the fan on gives 100% capacity, and the spray pump alone provides about 10% cooling capacity.
Patented Cooling Coil
Available in SUS304 and copper (optional); the SUS304 coil uses a patented design with a slightly inclined tube-bundle arrangement for easy drainage and withstands a 3000kPa×24-hour high-pressure test to ensure no leakage.
Coil Reinforcement Frame
The coil support uses national-standard angle iron with a hot-dip galvanized or painted surface; the frame is formed by welding steel bars horizontally and vertically inside to ensure the coil does not collapse or deform under full-load operation.
Axial Fan
An axial fan dedicated to cooling towers, designed and made with aviation technology, 400-5000mm in diameter, with large flow and medium-low pressure, high efficiency, energy saving, low noise, and adjustable angle; it consists of a motor, blades, guide cylinder, support frame, and mesh guard.
Pressurized Water Distribution System
A water distribution system that disperses water through spray holes under pressure; the nozzles are basically not prone to clogging and require almost no cleaning or maintenance.
Spray Pump
The spray pump shaft is made of SUS304, and the pump body, bearing housing, and impeller are made of FC200, fitted with a mechanical seal and NBR O-rings.
Variable-Frequency Capacity Control
The variable frequency drive (VFD) provides the most precise capacity control, with fewer motor starts and smoother operation; it is especially suitable for cold-climate operation, adjusting airflow to minimize icing, and the motor can also be reversed to de-ice.
Technical Specifications
| Model | Cooling Water Flow (m³/h) | Coil Area (m²) | Fan Power (kW) | Dimensions L×W×H (mm) | Operating Weight (kg) | Noise dB(A) |
|---|---|---|---|---|---|---|
| LMB-RB-16 | 16 | 40 | 0.75 | 1200×1200×2200 | 900 | 48.0 |
| LMB-RB-24 | 24 | 58 | 1.1 | 1400×1400×2500 | 1100 | 48.5 |
| LMB-RB-35 | 35 | 82 | 1.1 | 1600×1600×2800 | 1400 | 49.0 |
| LMB-RB-50 | 50 | 115 | 1.5 | 1800×1800×3100 | 1800 | 49.5 |
| LMB-RB-70 | 70 | 158 | 2.2 | 2000×2000×3400 | 2300 | 50.0 |
| LMB-RB-95 | 95 | 210 | 3.0 | 2200×2200×3700 | 2900 | 50.5 |
| LMB-RB-125 | 125 | 275 | 4.0 | 2400×2400×4000 | 3600 | 51.0 |
| LMB-RB-160 | 160 | 340 | 5.5 | 2600×2600×4300 | 4400 | 51.5 |
| LMB-RB-210 | 210 | 440 | 5.5 | 2800×2800×4600 | 5300 | 52.0 |
| LMB-RB-270 | 270 | 550 | 7.5 | 3000×3000×4900 | 6300 | 52.5 |
| LMB-RB-350 | 350 | 700 | 11.0 | 3200×3200×5200 | 7600 | 53.0 |
| LMB-RB-450 | 450 | 880 | 11.0 | 3400×3400×5500 | 9000 | 53.5 |
| LMB-RB-570 | 570 | 1090 | 15.0 | 3600×3600×5800 | 10500 | 54.0 |
| LMB-RB-720 | 720 | 1350 | 18.5 | 3800×3800×6100 | 12200 | 54.5 |
| LMB-RB-900 | 900 | 1650 | 22.0 | 4000×4000×6400 | 14200 | 55.0 |
| LMB-RB-1100 | 1100 | 1980 | 30.0 | 4200×4200×6700 | 16400 | 55.5 |
| LMB-RB-1350 | 1350 | 2380 | 37.0 | 4400×4400×7000 | 19000 | 56.0 |
| LMB-RB-1550 | 1550 | 2700 | 45.0 | 4600×4600×7400 | 21500 | 56.5 |
| LMB-RB-1750 | 1750 | 3050 | 45.0 | 4800×4800×7800 | 24000 | 57.0 |
Product Gallery
Images are from the LMB-RB Series Counter-Flow Dry-Wet Closed Cooling Tower product manual
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