Delta IA Builds Automated Energy-saving Cooling Tower Systems for Customers

With economic development and urbanization, the number of buildings is increasing around the world, which is a major factor in the global rise in carbon dioxide emissions.

Delta's Tainan Plant went into operation as Delta's first green building in 2006. Since then, all of Delta's office buildings, research centers, and factories have been designed and constructed as environmentally-friendly green buildings. Delta has applied its own green energy products and energy-saving automation solutions in its green buildings to enhance energy efficiency.

Delta has also imported a variety of industrial automation solutions to its own buildings to reduce the power consumption of its heating, ventilation and air conditioning (HVAC) systems, which consume the most energy for all types of buildings.

One of Delta's most successful cases is the Taoyuan Technology Center. It adopts Delta's HVAC solution to save about 50% in energy annually when compared to other buildings of the same scale. Delta shared its remarkable results and now provides energy-saving HVAC solutions to customers worldwide.

Recently, Delta has assisted a customer in improving the power efficiency of their cooling tower system. The main function of cooling towers in HVAC systems is to take heat produced by air conditioners and dissipate it via cooling water into the atmosphere. The water that passes through the cooling pump will return again to absorb heat from equipment that needs cooling down, such as air compressors and steam turbines.

For the requirements of the cooling towers, Delta adopts the small programmable logic controller (PLC) DVP Series as the host controller, and couple it with six fan/pump vector control drives CP2000 Series for variable frequency control of the cooling tower's fans. Based on return water temperature and outside air temperature and humidity, the control system determines the frequency and number of operating fans. In general, all fans work when the inlet water temperature is higher than the upper limit. All fans stop when the inlet water is lower than the lower limit, otherwise, the control system judges the number of fans for operation and their operation frequency under other conditions.

Delta's fan/pump vector control drive CP2000 Series is specifically designed for fans and pumps with a wide range of models (230V 0.75kW ~ 90kW / 460V 0.75kW ~ 400kW) to fulfill the demands of different industries. With a built-in 10k steps PLC function, the CP2000 Series allows users to execute fixed-amount / time circulation control of up to 8 fans/ water pumps at the same time. It also provides customers with various modes specifically designed for fan/pump applications, such as PID control, sleep/wake up functions, flying start, skip frequency and more.

After importing Delta's solution, the customer achieves 24 hour auto control of fan operation and frequency adjustment. The system can automatically calculate the optimum return water temperature and PID value based on outside temperature and humidity without manual adjustment. For control modes, Delta offers flexible switching between remote/local and manual/auto control to ensure proper system operation, and easy troubleshooting. This provides a substantial increase in overall system flexibility and management convenience, while achieving energy efficiency.

Delta integrates its own automation products, technologies and hands-on application experience, providing customers with the best solutions for cooling towers. Meeting customers' requirements with additional value, Delta's HVAC solution has not only received recognition and praise but it offers a perfect model for HVAC systems in buildings and factories.