Cooling performance of silent cooling systems built by free convective coolers.

For the planning of "silent cooling" systems built by free convective coolers, it is necessary to support characteristic data for the cooling performance and the effect of different installation and operating parameters on the cooling performance. At the "Institut für Angewandte Thermodynamik und Klimatechnik" at the University of Essen measurements of the cooling performance of free convective coolers were carried out by using a testing chamber as well an enlarged and modified testing room with dimensions near to practise. The investigations have shown that the cooling performance of convective coolers varies with different parameters like dimensions of the room, distibution of heat sources and positioning of the coolers in the room A realistic investigation of these coolers and an objective comparison with other systems like chilled ceilings is only possible, if the investigation takes place under realistic operating conditions and arrangements of coolers and heat sources. Otherwise, the results from different systems are not comparable. The effects of different inhallation parameters have shown, that an accurate planning of the installation is necessary to guarantee sufficient cooling performance