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                                                    HVAC control- Regulate cooling-tower water temperature and save energy

                                                     
                                                     

                                                    Main drivers

                                                    “My cooling tower is a constant concern. Maintenance needs vary widely depending on the season, and the installation uses too much energy. I want a solution that will improve yield and reduce costs.”

                                                    Solution in brief

                                                    Use speed drives to regulate the tower’s fan and pump

                                                    Solution applicable to medium-sized to large buildings with cooling tower

                                                    The best way to control air-water exchange in a cooling tower is to use variable speed drives to control  the tower’s fan and pump, eliminating additional maintenance-hungry mechanical systems while  meeting the tower’s needs. A PLC regulates fan airflow and pump volume via the variable speed drives.

                                                    This solution uses up to 50% less energy than direct-start fans and pumps and eases maintenance. Over a given season, the fan and pump motors must operate at full speed just 2% to 5% of the time—the rest of the time this energy is wasted. Direct-start motors require additional mechanical systems to solve problems like fan blade rotation due to wind, or additional resistance due to freezing.

                                                    This solution uses 20% less energy than two-speed motors and also improves maintenance. While two-speed motors offer a partial solution to energy consumption issues, they do nothing to resolve maintenance issues.

                                                    Benefits for End Users

                                                    > Reduce energy consumption
                                                    > Improve yield by regulating water temperature
                                                    > Lower maintenance requirements, especially in extreme weather
                                                    > Quieter operation
                                                    > Low harmonics: THDI < 30%
                                                    > Eliminates inrush current due to motor start-up

                                                    Benefits for professionals

                                                    + Simpler mechanics (no brakes, sensors, or rotation inverters)
                                                    + Facilitates motor sizing (over-speed and standby modes available)
                                                    + Enhanced process regulation
                                                    + Extends lifetime of mechanical components
                                                    + Facilitates maintenance planning

                                                    Architecture

                                                      

                                                      
                                                     
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                                                    Speed drive application in cooling tower

                                                     

                                                    Main products HVAC Control