Uwe Kress and Sven Krause spoke in part of the lecture series about environmentally friendly air conditioning on 5 and 6 October 2010 the third energy efficiency fair was held in the House of industry and Chamber of Commerce Frankfurt Stock Exchange hosting the world famous Frankfurt Trade Hall is. Target group of the fair were makers of medium and large companies from industry, trade, hospitality and other industries, the real estate industry, municipalities and multipliers. They could find out about topics such as energy management, renewable energy, building technology, energy efficiency, consulting, Green IT and data centers. Included, not just a consulting Cafe and a best-practice courses were”with success examples available, but also a series of lectures, the approximately 40 lectures on topics such as energy efficiency or climate – and environmental protection. “The BEAK AG also took part in this series: on the 5-10 peer-reviewed Uwe Kress and Sven Krause in the area Amsterdam” on the topic of environmentally friendly air conditioning with highest Energy efficiency using the example of a data center’s new premises in Frankfurt am Main”. Addressed were especially companies, local authorities and the real estate industry with this talk. Kress and Krause presented a Frankfurt data center construction project with a fully redundant cooling in 2(n+1). The special thing about it: in the refrigeration supply has been omitted on water pollutants in the cooling water circuit completely. In addition, an increase in the overall efficiency of the system was achieved and a considerable saving of operating costs forecast due to increase in specific heat capacity in the cooling water circuit. A free cooling operation will also be possible during half of the year.