Double-Side Combined-Flow Closed Circuit Cooling Tower
The double-side combined‑flow closed‑circuit cooling tower features air intake from both the left and right sides of the casing. Cooling air enters symmetrically into the coil and fill sections, where it engages in combined cross‑flow heat exchange with the downward falling spray water. The tower is arranged with a water distribution system at the top, followed in sequence by the heat exchange coil section, the PVC fill zone, and the collection basin at the bottom. Cooling air from both sides flows horizontally across the coil bundle, making full contact with the spray water film on the outer coil surface, then continues through the fill section to pre‑cool the spray water before it is recirculated. This symmetrical dual‑side air intake promotes uniform airflow distribution and enhances heat transfer efficiency. The casing is constructed from ZAM‑coated steel or 304 stainless steel, offering excellent corrosion resistance and weatherability. The internal circulating fluid—softened water, pure water, or process fluid—operates in a closed coil loop, completely isolated from outside air, effectively preventing scale formation and fouling. Specifications Heat capacity: 87 – 1,744 kW Flow rate: 66 – 1,321 gpm / 15 – 300 m³/h Type: Combined‑flow / Axial fan / Induced draft
How it works?
The dual‑side combined‑flow closed‑circuit cooling tower operates on three synergistic mechanisms: closed internal circulation, external spray circulation, and dual‑side combined‑flow heat exchange. The process fluid to be cooled (softened water, oil, or specialty fluids) circulates in a closed loop within the serpentine coil, completely isolated from the outside environment to ensure purity and prevent contamination. Meanwhile, the overhead spray system evenly distributes water from the collection basin over the outer coil surface, forming a continuous water film that continuously absorbs heat from the fluid inside the coil. Cooling air is drawn in simultaneously through the inlet grilles on both sides of the tower. The air flows horizontally across the coil bundle, coming into cross combined‑flow contact with the downward falling spray water on the coil surface. During this process, a portion of the spray water evaporates, removing significant latent heat, while the air simultaneously carries away sensible heat through the temperature difference, achieving efficient cooling. The moist heated air passes through the drift eliminator at the top to remove entrained water droplets before being discharged to the atmosphere. The cooled spray water falls back into the collection basin for recirculation, while the process fluid returns to the equipment, completing the closed‑loop cooling cycle.
Structure & Characteristics
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1 、Heat Exchange Coil:
Heat exchanger is the core of a closed-circuit tower. Standard coils are 304 stainless steel, with options for 316L, copper, or duplex steel. All coils are pressure-tested for leak-proof performance. Multi-layer serpentine layout with optimized tube spacing allows smooth air passage and efficient heat transfer.
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2 、Fan:
The fan drives airflow across the coil and fill media to carry away heat; airflow volume directly affects cooling performance. All units feature special axial fans with nylon or aluminum blades, galvanized steel supports and guards. Motors are IP55-rated, Class F insulation, with optional VFD for energy-saving speed control.
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3 、Spray Pump:
The spray pump draws water from the basin and delivers it to the top distribution system, powering the external circulation loop. Xuelun uses high-performance branded pumps with high flow, low power draw, and quiet operation. Pump bodies and impellers are available in cast iron or stainless steel to suit different water quality conditions.
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4 、Water Distribution System:
The distribution system sprays water evenly over the coil surface to form a continuous film—uniform coverage directly impacts heat transfer efficiency. On counterflow towers, the system sits at the top, using high-capacity ABS basket-type nozzles that resist clogging and are easy to remove for cleaning.
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5 、Air Inlet Louver:
The inlet louver guides air evenly into the tower while blocking debris like leaves, insects, and dust to prevent coil and nozzle fouling. It features PVC fill with a metal frame and is fully removable—simply lift upward and pull outward from the bottom for convenient cleaning.
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6 、Drift Eliminator:
The drift eliminator sits below the fan or at the air outlet, using inertial impingement to capture fine water droplets from the moist air and return them to the basin, reducing water loss. Made of corrosion-resistant PVC, it limits drift loss to under 0.1%.
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7 、Fill:
The unit uses Marley PVC fill, installed beneath the coil. Its honeycomb cross‑flow structure spreads the spray water into a broad film. As air sweeps across, it removes heat, pre‑cooling the spray water and thereby sharing the coil’s thermal load. The fill offers low air resistance, resists aging, and maintains its shape, making it well suited for prolonged hot and humid conditions.
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8 、Casing:
The casing provides structural support and weather protection for internal components, shielding them from rain, sun, and spray corrosion, while also reducing noise and improving appearance. Constructed from ZAM-coated steel or 304 stainless steel, laser-cut for precision—offering superior corrosion resistance over standard galvanized or FRP shells.
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9 、Collection Basin:
Located at the base, the basin collects spray water and provides a stable suction source for the spray pump. The basin is typically made of the same material as the casing—ZAM-coated steel, with 304 or 316 stainless steel available as upgrades for enhanced durability in demanding environments.
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10 、Base Frame:
The base frame supports the entire tower, transferring weight to the ground and ensuring stable, level operation. Constructed from galvanized channel steel; stainless steel is available as an option for applications requiring additional corrosion protection in humid or chemically aggressive environments.
Basic norm
