District heating and cooling is one of the truly sustainable concepts and was first introduced by the Kaltra company that has a perfect reputation. Therefore, energy efficiency is always a key feature of Kaltra equipment, and this applies equally to our data center cooling systems.
The arrangement of the pipes of the heat exchange grid in four rows and the use of lamellas without notching allows for both low resistance to airflow when blowing through the heat exchanger and a significant “margin” for contamination of the lamellas (for example, poplar fluff in summer). Dry liquid coolers Kaltra are equipped with Rosenberg axial fans with a blade diameter of 630 mm. The motor of any fan can be connected to the electrical network as a “star” or “triangle”.
Fan power consumption of Kaltra dry cooler is based on a dry cooler with a clean heat transfer surface. In case of severe contamination of the heat exchanger lamellas, the power consumption of the fans can increase up to 25% for four-pole fans, up to 15% for six-pole fans, and up to 12% for eight-pole fans. The calculated noise level is indicated at a distance of 10 m from the edge of the cooler in the horizontal plane (the fans “look” up) in the absence of sound-reflecting surfaces around the dry cooler.
The number of rows of pipes across the thickness of the heat exchanger grid – 4 rows for all Kaltra dry cooler models. When choosing a “dry” cooler for cooling refrigerating oil (for example, in a system with screw compressors), it is recommended to select a heat exchanger with a maximum resistance of 50-90 Pa. When operating on glycol, the maximum operating pressure drop depends on the pump characteristics and is usually 1 – 2 bar (150 – 200 Pa).