Data Center Journal

Volume 34 | October 2014

Issue link: https://cp.revolio.com/i/394834

Contents of this Issue

Navigation

Page 13 of 32

lation and dri, since the towers feature high air exit and low air entry velocities. But their fans may be more susceptible to vibration, which can lead to equipment failure. ey also generally provide tougher maintenance access. Crossflow-induced draft towers ese towers are popular in data centers owing to their ability to produce higher-capacity flow in devices that take up smaller footprints. ey feature slanted fills on either side (almost in a "V" shape). e towers induce horizontal air movement over the fills, and water flows across the air stream (hence the name crossflow), letting air out at the top. Crossflow-induced dra towers offer better maintenance access than induced-dra towers, and higher water loading reduces the potential for scaling and water fouling. ey pose a higher risk of recirculation, however, because they tend to be shorter than induced-dra and forced-dra towers. Crossflow-induced dra towers are also generally less tolerant of obstructions to airflow than other types of tower designs. Fluid coolers ese are closed-circuit cooling towers in which the process fluid does not actually touch the cooling air. Unlike other towers, which generally depend on water, fluid coolers can use various types of fluids in their processes, including water, plating solutions, quenching oils, chemical solu- tions, gases and refrigerants. ey do rely on water to work properly, but they require only a small quantity of the liquid storage to achieve proper evaporation. Fluid coolers offer a number of benefits and potential drawbacks. ey require reduced water treatment and suffer less corrosion but can be heavier and larger than other kinds of towers, and they can take up a wider footprint. Fluid coolers also require increased fan energy, and their tubes are susceptible to local dry areas caused by solid deposits. Evaporative condensers ese designs are very similar to fluid coolers. ey're closed-circuit cooling towers that use different fluids, including refrigerant. e refrigerant is cooled or condensed directly in a closed coil. Evapo- rative condensers can use air, water or a combination of both, to transfer heat to the surrounding environment. eir energy efficiency is very high, which makes them appealing to data center operators. Evaporative condensers don't have many drawbacks, but they do have a couple. ey're susceptible to corrosion and scaling, much like any other cooling

Articles in this issue

Archives of this issue

view archives of Data Center Journal - Volume 34 | October 2014