aquafan introduction - watco group

AQUAFAN+ INTRODUCTIONHydro-Powered Cooling Tower Technology with Back-Up Motor

AQUAFAN+Turbine Powered Cooling Tower with Backup Motor

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.

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

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)

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

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

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

Testing to be doneTurbine Efficiency Validation• Equip AQUAFAN at our site with motor• Run following tests:

1. Full speed fan on turbine (base line)2. Full speed fan on turbine + motor3. Full speed fan on motor

• kW(3) – kW(2) = kW from turbine• kW turbine / kW water = Turbine Efficiency

Thermal testing

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

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