Two-Speed Motors

Marley / Sigma Steel CoolingTower / Engineering Data: Energy Management 11

Cooling towers are usually selected to produce a specific cold water temperature at the higher summertime wet-bulb temperatures. During the remainder of the year, the cooling tower is capable of producing much colder water. Unless your system will benefit from the coldest possible water tempera- ture, you should consider controlling cold water tempera- tures to higher levels. You’ll also save energy by using such control. For greater insight on cold water temperature control, please read “Cooling Tower Energy and its Management”, Technical Report #H-001A, available from your Marley sales representative or on the web at spxcooling.com.

Always control leaving water temperature by manipulating the quantity of air that the fan moves through the tower. Vary- ing the quantity of water flow is not normally recommended and can be harmful in freezing weather. You can alternately start and stop single-speed motors to maintain water tem- peratures within an acceptable range. However, exceeding a total acceleration time of 30 seconds per hour can overheat the motor, causing the insulation to fail. Limiting the number of motor starts, on the other hand, can produce significant variations in the temperature of the water delivered to the process.

Increased flexibility can simplify your operating procedures and save you money in the long run, both on operation and on maintenance. Here are two of the more popular options.

Two-speed motors improve operating flexibility by increas- ing the number of potential operating modes. Users in north- ern climates will find that the tower can carry winter loads at half-speed; reducing fan power requirements by 85+% during that time. Two-speed motors also help to control icing during wintertime operation. See Marley Technical Report #H-003, “Operating Cooling Towers During Freezing Weather”, available from your Marley sales representative or on the web at spxcooling.com.

Normally, two-speed motors are provided in 1800/900 RPM, single winding configuration, which is the least expen- sive two-speed option. They are also available in other combi-

nations including the more expensive double winding.

Variable Speed Fan Drive

Frequency modulation devices work well on induced draft, propeller fan cooling towers such as the Sigma Steel cooling tower. However, their design must include the capability to lock out any critical fan speeds and the very low fan speed ranges.

Marley VFD drive systems are designed to combine abso- lute temperature control with ideal energy management. The cooling tower user selects a cold water temperature and the drive system will vary the fan speed to maintain that tem- perature. Precise temperature control is accomplished with far less stress to the mechanical equipment components. The improved energy management provides fast payback. Indeed, many utilities offer generous rebates for users having installed VFD drives.

Marley Sigma Steel specifications

SPX Cooling Technologies is a prominent name in the cooling industry, and the Marley Sigma Steel is one of their flagship products. This cooling tower is designed to provide an efficient, reliable, and sustainable solution for industrial cooling processes. With its advanced engineering and innovative technologies, the Marley Sigma Steel stands out in various applications, from power plants to chemical processing facilities.

One of the main features of the Marley Sigma Steel is its robust construction. Made from high-quality steel, this cooling tower is built to withstand harsh environmental conditions, ensuring durability over time. The galvanized steel construction offers excellent corrosion resistance, which is critical for operations in challenging environments. This longevity helps reduce maintenance costs and downtime, providing a reliable cooling solution for years to come.

The Marley Sigma Steel incorporates a fan-assisted design that enhances airflow across the heat exchange area, improving the overall thermal performance. This design not only increases the efficiency of heat transfer but also minimizes energy consumption, which is essential for companies looking to reduce operational costs. The axial fans utilized in this cooling tower are engineered for quiet operation and enhanced efficiency, making them an ideal choice for urban and noise-sensitive locations.

Another hallmark of the Marley Sigma Steel is its modular design. The cooling tower can be easily configured to meet specific capacity and space requirements, making it a versatile option for a range of applications. This adaptability allows for seamless integration into existing systems, ensuring that whether it's a new build or a retrofit project, the Marley Sigma Steel can meet the needed specifications while optimizing performance.

SPX Cooling Technologies emphasizes sustainability through the Marley Sigma Steel by incorporating environmentally friendly practices in its design. The tower features options for low make-up water use, minimizing resource consumption during operation. Additionally, the innovative water distribution system ensures even water flow across the fill media, enhancing efficiency and reducing water waste.

In summary, the Marley Sigma Steel from SPX Cooling Technologies is a state-of-the-art cooling solution that combines durability, efficiency, and sustainability. Its advanced engineering and design features, such as the robust steel construction, fan-assisted airflow, modular capabilities, and water-saving technologies, make it a frontrunner in the cooling industry, suitable for a wide array of industrial applications. Companies looking for a reliable, efficient cooling system will find the Marley Sigma Steel to be an excellent choice that meets both current demands and future sustainability goals.