The Grosshadern site of Munich’s University Hospital is a 13-floor complex built in the 1970s. It uses 64,000 cubic metres of hot tap water annually. The tap water network consists of some 200 km of piping and more than 7,000 tap outlets. With today’s standards, the pipes are over-dimensioned and the network has repeatedly been altered and added to.
Like every hospital, the Grosshadern clinic needs to keep its patients and staff safe from legionella bacteria in the hot tap water. The extensive network made it difficult to correctly assess the temperature drop (and thus increased bacterial risk) in every remote corner of the system. Specific preventive technical measures were required to ensure a permanent supply of legionella-free tap water everywhere.
In the hospital’s twelve technical centres, the water-heating equipment has been renewed. Old water tanks have been replaced with Alfa Laval’s anti-legionella system AquaProtect-T. It is designed for thermal disinfection of hot water, to eliminate legionella. Only disinfected water now goes into the network. Thanks to effective heat recovery, the thermal disinfection process consumes virtually no extra energy.
In addition to eliminating legionella throughout the entire hospital, the AquaProtect-T system provided several significant energy savings. In each technical centre, rather than keeping multiple 5,000-litre storage tanks heated, the flow is now heated and disinfected in a two-stage process using compact heat exchangers.
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