Data center cooling technology is constantly evolving and evolving. Among them, indirect evaporative cooling technology is one of the energy-saving data center solutions that have been widely used in recent years, and Aolan (Fujian) Industry has even taken the lead in completing the development of indirect evaporative refrigeration technology, with an indirect evaporation efficiency of nearly 100%, and if direct evaporative cooling is carried out, the total wet bulb efficiency will theoretically reach 130%.
The indirect evaporative cooling technology is used to effectively extend the free cooling time, thereby reducing the energy consumption of the refrigeration system, and has the characteristics of low PUE and integrated design. But as the technology became available in the market, some of its operational challenges began to emerge.
Indirect evaporative cooling systems will have three operating conditions during operation: dry, wet, and mixed. Because both wet mode and mixed mode need to use spray water to cool the hot air in the heat exchanger core, the heat exchange efficiency between the spray water and the heat exchanger core will directly affect the operating energy consumption of the system.
After a period of operation, many data centers using indirect evaporative cooling technology have found deposits and fouling on the surface of the heat exchanger core, which need to be cleaned regularly to restore heat exchange efficiency. This not only increases the difficulty of operation and maintenance and the energy consumption before cleaning, but also damages the heat exchanger core due to frequent cleaning.
How can we avoid these problems and keep the heat exchanger core at an efficient heat transfer efficiency?Combined with the on-site application of the Aolan indirect evaporative cooling core in a leading data center enterprise, it is hoped that it can give some reference and reference to the data center using the indirect evaporative cooling system.
On the one hand, the Aolan indirect evaporation core is welded by a special process of nano-scale high hydrophilic membrane and polymer materials, which is resistant to high and low temperatures, and at the same time, a wide sheet spacing plate structure and a glue filling process are adopted to ensure the overall strength and sealing of the heat exchange core, ensure a larger heat transfer area and reduce the wind resistance of the runner. In short, the Auslan indirect evaporation core has the characteristics of high strength, good heat exchange performance, corrosion resistance and long life, and can be washed many times without affecting the performance.
On the other hand, according to the different requirements of the user's environment, the Aolan indirect evaporation core can be equipped with a water softening system to suppress the deposition of scale in the system. Alkaline salts such as calcium and magnesium present in the water combine with bicarbonate ions in the water to form water-insoluble precipitates such as calcium carbonate and magnesium carbonate, known as scale. In areas with hard water quality, the water replenishment and softening system can effectively remove calcium and magnesium ions in the water, reduce maintenance workload and prolong the life of the unit.
Heat exchange is the core role of indirect evaporative cooling, and the excellent heat exchange efficiency can effectively improve the operating efficiency of the unit system and reduce the operating energy consumption of the system. The good and stable operation of the spray water is the basis for the core to maintain the heat exchange efficiency. Through good chemical water treatment combined with stable sewage control, the efficiency of system operation can be effectively maintained and the energy consumption of operation can be reduced.
In fact, in order to ensure the heat exchange efficiency and production safety of the indirect evaporation core, it is necessary to carry out regular descaling and cleaning. Regular cleaning can keep the equipment clean, prevent dirt from affecting the normal operation of the equipment, and also pay attention to keeping the plant and the surrounding environment clean, which is conducive to the safe use of the equipment.