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AQUAFAN Introduction - Watco Group

Hydro-Powered Cooling Tower Technology with Back-Up Motor.

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AQUAFAN Introduction - Watco Group

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  1. AQUAFAN+ Introduction Hydro-PoweredCoolingTowerTechnologywith Back-Up Motor

  2. AQUAFAN+Turbine Powered Cooling Tower with Backup Motor

  3. Principals • AQUAFAN+ is equipped with turbine that converts residual water pressure into fan rotation • Backup motor delivers extra power when the cooling demand requires additional performance.

  4. Key data • Cell modules of 3.6 meter with 2.4 meter fans • Rotation generated by turbine up to 200-250 RPM ( t-RPM [turbine RPM] depending on water pressure available) • Total rotation required up to 400 RPM • Typical total fan shaft power required up to 7.5 kW

  5. Mechanics • Motor controlled by VFD • VFD keeps motor free running in t-RPM range (negligible electricity consumption) • Above t-RPM motor adds fan speed: • VFD controlled via PT100 on return water and in relation cooling demand (option 1) • VFD controlled via RPM meter (option 2) • Motor runs fan at full RPM (energy saving realized as part of shaft power delivered from turbine)

  6. Development Project • Topic in discussion with VFD supplier (China) and Motor Supplier (Germany) • Scope of supply VFD supplier: • VFD + programming • RPM meter / PT100 • WATCO supply: • Cooling tower • Turbine • Motor

  7. How on Versace • We select motors that can handle full power and fit into the structure of turbine + water distribution system • No need VFD programming as motors will always run at max RPM • Decide with DCPro: pump action to the tower to establish nozzle configuration

  8. Advantages • Keep AQUAFAN concept alive in DXB • Applicable Versace • No need thermal validation before go to market • Allows AQUAFAN selection in critical applications with low approaches • Can be submitted for CTI certification

  9. Testing to be doneTurbine Efficiency Validation • Equip AQUAFAN at our site with motor • Run following tests: • Full speed fan on turbine (base line) • Full speed fan on turbine + motor • Full speed fan on motor • kW(3) – kW(2) = kW from turbine • kW turbine / kW water = Turbine Efficiency

  10. Thermal testing • Thermal testing not required for performance guarantee (only for indicative purposes)

  11. Power Saving • Assumptions: • “safe” system design leaves up to 0.5b residue pressure • 200 m3 water over 12’ cell • Water energy  2.7 kW • Turbine efficiency = 50%  1.35 kW turbine contribution to system • On total requirement of 6.5 kW  20% energy saving

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