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DBNL₃ / CDBNL₃ / GBNL₃ · 3–8 °C drop · to −50 °C

DBNL₃ Circular Counter-Flow FRP Cooling Tower

Round shell, belt drive, low drift — the standard tower for HVAC and light process cooling.

  • MotorIP55, class F insulation, sealed waterproof, heat resistant

The DBNL₃ family is the energy-efficient round-shell tower: an imported gel-coat FRP casing that resists UV and ageing, a Tsinghua-designed fan, and a polyester-fibre reinforced neoprene belt drive instead of a gearbox. The low-noise D type and ultra-low-noise CD type give a 3–8 °C drop for air-conditioning duty; the industrial GBNL₃ type widens the diameter and raises airflow, fan pressure, motor power and fill height to reach a 10–25 °C drop on hot process water.

Specification

Tower typeCircular counter-flow, induced draft, FRP shell
Water temperature drop3–8 °C on D / CD duty · 10–25 °C on GBNL₃ industrial duty
Noise classD low-noise · CD ultra-low-noise, approx. 5 dB(A) lower than D
FanTsinghua-designed; aluminium-alloy or FRP airfoil blades, wide chord, large angle; blade angle adjustable from size 150
DrivePolyester-fibre reinforced neoprene belt — high temperature, no slip, low noise
MotorIP55, class F insulation, sealed waterproof, heat resistant
FillModified PVC corrugated sheet, flame retardant — 70 °C high-temp grade / 50 °C low-temp grade
DriftCollector hood at the air outlet keeps drift loss to a minimum
Cold climateSuitable to −50 °C; anti-icing package for sites below −10 °C monthly average; fan can reverse briefly for de-icing
Support frameAssembled galvanised or painted structure, galvanised or stainless fasteners

Design notes

  • Belt drive, not a gearboxA polyester-reinforced neoprene belt absorbs shock loads and keeps the motor out of the hot air stream. No oil to change, no oil-temperature alarm to ignore.
  • Low drift by geometryThe water collector at the outlet recovers spray that would otherwise leave with the exhaust air, so make-up water and chemical treatment stay low.
  • Built for cold sitesAnti-icing package and short fan reversal for de-icing let the tower run through a −50 °C design condition rather than being drained each winter.
  • Two noise classes from one shellThe CD build adds an absorption hood at the air outlet and an absorption pad in the basin — same footprint, roughly 5 dB(A) quieter.

Options

  • VFD fan and motor combination with load-following control
  • Ultra-low-noise hood and basin absorption pad (CD build)
  • Anti-icing package and ice-removal reversal control
  • Stainless-steel fasteners and walkway handrails

Applications

  • HVAC and air-conditioning condenser water
  • Commercial buildings, hotels and hospitals
  • Light industrial process cooling
  • High-temperature industrial water on GBNL₃

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