Abstract :
Today there are three main possibilities for further energy savings in the cooling of digital switching rooms of the Telekom, using the existing unit technology: - Change to constant temperature difference control The savings potential of this measure mainly depends on the existing partial load condition of the individual installation. The magnitude cannot be indicated in general, but as an average it should be at least 30 to 35%. - Accurate consideration of external pressure losses The average values of all analyzed units in figure 3 shows an additional energy consumption of 8%, compared to the specification. Careful project engineering, especially for new buildings, should permit even lower external pressure losses than specified by the Muster-Leistungsverzeichnis der Deutschen Bundespost [1]. - Return temperature of 36°C throughout the year, eventually 40°C This operating mode can be implemented by simple modification of the DDC programs. It lowers the annual energy consumption by 20%, eventually even 45%. Summing up these possibilities, an overall reduction of the energy consumption of at least 50 to 60% should be possible, whereby measures 1 and 3 can be implemented on existing systems without excessive expense.
