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13-23: Direct Drive Motor Design - Improving Product Availability byThe horsepower and speed required for a given fan depends on many factors, including maximum tip speed, blade design, blade pitch, and required CFM. There are an infinite number of HP RPM shaft combinations that could be requested from a direct drive motor manufacturer. With careful design, it is possible to create a "universal" motor that covers a wide range of requirements. This paper discusses characteristics that must be considered when designing

Identifying

Whether using galvanized steels

Operational sites have demonstrated significant reductions in operational costs when compared to conventional bromine or chlorine chemicals

002 percent was required

Many Cooling towers and once through cooling systems' operators are facing tighter regulations on metals concentrations in cooling water discharge

While water treatment is the science of minimizing these conditions

This paper outlines the air pollution aspects of water cooling towers in relation to the future trends

Recirculatory cooling systems using natural or mechanical draft towers

more stringent restrictions on permitted discharge consents and/or increased cost or reduced availability of good quality water have emerged or developed in some parts of the world

Although the paper deals primarily with large electric utility plants

Cooling towers are designed to achieve the specified cooling capacity at the highest ambient wet bulb temperatures for the area in which it will be operated

Simultaneous with this concern about thermal pollution and the trend towards use of recirculatory systems incorporating evaporative cooling systems

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