17-25: Using Direct Drive Technology for Improved Reliability and Efficiency Mechanical Draft Towers

17-25: Using Direct Drive Technology for Improved Reliability and Efficiency Mechanical Draft TowersThis paper discusses the development of low speed, permanent magnet motors and how they can be used in direct drive applications to eliminate the gearbox, NEMA motor, driveshaft, and disc couplings from field erect cooling tower designs. Improved reliability of cooling tower fan drives is now possible due to advancements in motor technology as evidenced over the last 9 years. Case studies are presented where cooling towers have been retrofitted.

accelerating corrosion and impairing heat transfer

charge modification behavior) for various dispersants is correlated to performance in light transmittance lab tests

Marley cooling tower in 1998

This paper addresses these questions provides cost justifications

However laboratory testing and real world experiences have shown that these fills exhibit similar responses to bio-fouling problems as film fills with respect to product design and flute geometry

if someone had said that air conditioning systems must be available for comfort cooling in sub-zero weather

During the test batch Na-hypochlorite dosing was unable to mitigate the biofilm significantly

Over the past several years

we will look at the various methods: of treating a process that contains a biofilm

of parallel shaft design

a microbial problem is ever present

The latter is often desirable for both cost of treatment and the effectiveness