Since the foundation in 1947 the company STULZ has become the worldwide  market leader in developing and supplying R&HVAC systems. Due to the wide and  innovative product portfolio STULZ is able to offer optimized solutions for the  complex air conditioning of telecom-munication- and IT-buildings.    Next to the different components for the airconditioning STULZ also consults  architects and project managers in dimensioning and designing server rooms and  where they should be placed within a building. Depending on the thermal load and  the humidity a single room can also be subdivided into separate zones, which  leads to a homogenization of the temperature distribution even for large  variations in the thermal load of the different racks. A temperature outside the operational temperature interval for  computers reduces the durability of the electronical components significantly  and just a few degree Celsius to high lead to an overheating of the technical  infrastructure and damage valuable data. Therefore it is necessary for any  company with an IT-infrastructure to think about a sufficient and reliable air-  conditioning already in an early stage of predesign or at least during the   assembly of the technical rooms. The thermal load of server rooms increases  rapidly. Nowadays about 800 watt per square meter need to be compensated by  air-conditioning, for internet applications even 1.500 watt per square meter.  The near future is already been pointed out by the IBM supercomputer centre,  which has been designed for the calculation of climate changes and genetic  technology. The heat generation of these computers is 1.5 megawatt on 250  square meters, thus 6.000 watt per square meter. These thermal loads are  enormously challenging for  air-conditioning suppliers and designers. To be  prepared for this nearby future an integrated and innovative approach of the  relevant physics of heat transfer is essential.   Therefore FlowMotion as a specialist in fluid dynamics and heat transfer has  been asked to obtain deeper insight in the velocity and temperature distribution  not only at any position in the server room, but also within the computer racks.  To get this information already in the predesign of a server room the air flow  and the resulting temperature distribution has been simulated by CFD  (Computational Fluid Dynamics) calculations. In these simulations all relevant  geometrical details like the position of all racks, air in- and outlets, double flooring and the various working conditions  have been implemented. To predict the air flow accurately the influence of free convection and thermal radiation have  been taken into account. By analysing the numerical results critical regions could be detected and improved concepts  for the air-conditioning could be developed without any increase in investment or operational costs and with an ever  higher degree of reliability. Offices: The Netherlands Leeghwaterstraat 21 2628 CA Delft Tel.: +31 15 278 2907 Germany Weenermoorer Str. 193 26826 Weener Tel.: +49 4953 922 969 Consultancy for Heat Transfer and Fluid Dynamics CFD makes fluid dynamics visible. We solve every Flow problem. Computer-Fridge Flow- and temperature analysis in a server room STULZ www.stulz.de Velocity Temperature Server room air conditiong