The campuses Berliner Tor and Bergedorf were built in the 1970s. An extremely outdated HVAC as well as inefficient lighting incurred high maintenance and energy costs at the campuses, and students and instructors found the conditions unsatisfactory. University administrators wanted the building technology to reflect HAW’s position as a modern and innovative university.
Siemens was commissioned to carry out an energy-related renovation of the two campuses. Under the contract, the university paid for the renovation costs from the savings provided by the updated technologies.
To start, HAW students assessed the current state of the HVAC. Siemens then refined the statistics and calculated the savings potential. Afterward, in collaboration with the customer, a range of measures were established for saving energy, such as exchanging around 20 ventilation and air conditioning systems. The building Automation system was upgraded to Desigo 5.1. With the modernization of the measurement and control system, the basis was set for better control of the buildings as well as for a comprehensive monitoring system. Around 9,000 lamps were updated to T5 fixtures equipped with an electronic ballast or LED technology.
In order to ensure the guaranteed savings and to optimize energy use for the future, Siemens takes care of monitoring and controlling the modernized systems. An integrated measurement concept continually records electricity, heating, cooling and water as well as the volumetric flows of the heating, ventilation, air conditioning and refrigeration units; defective elements are exchanged in the framework of the Energy Performance Contracting.
A special challenge in the project was updating ventilation in a 15-story building within a ten-week break period. In 300 rooms, ceiling panels were cleaned and new insulation was installed. To complete work within the tight time period, more than 250 staff members worked in three-shift operation.
Since completion of the renovations, expenditures for energy at HAW have declined by 27 percent, which equals annual savings of €500,000. As a result of the new technology, the university also saves €200,000 in maintenance costs, and CO2 emissions have been cut by 2,077 tons.