ZLT Round Counterflow Open Circuit Cooling Tower is a counterflow, open circuit cooling tower family with corrosion-resistant FRP construction. It is configured against project water temperatures, wet-bulb conditions, water quality, noise limits and site constraints.

Manual-Verified Representative Models

The specifications below were checked directly against the 2025 product manual. They are representative catalog configurations, not a substitute for final thermal selection.

Model	Flow (m³/h)	Head (kPa)	Dimensions (mm)	Fan Ø (mm)	Motor (kW)	Net weight (kg)	Operating weight (kg)	Inlet / outlet DN
ZLT-10T	10	18	Ø1200 × 2370	600	0.18	120	460	50 / 50
ZLT-15T	15	19	Ø1200 × 2300	770	0.37	150	700	50 / 50
ZLT-20T	20	19	Ø1450 × 2400	770	0.55	180	860	80 / 80

Published Selection Basis

Inlet water temperature: 37°C
Outlet water temperature: 32°C
Wet-bulb temperature: 28°C
Atmospheric pressure: 99,400 Pa
Water temperature drop: 5°C

Engineering Information Required

Send design flow, entering and leaving water temperatures, design wet-bulb temperature, installation altitude, circulating-water quality, noise target, power supply and footprint limits. Apex will confirm the final model, cell quantity, materials, motor configuration, piping and delivery scope.

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Round Cooling Towers

ZLT Round Counterflow Open Circuit Cooling Tower