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The use of information technology services is increasing and causes a rising energy demand of data\ud centres. In order to cover the requirements linked to this effect and respond to the energetic and environmental goals,\ud fossil fuels need to be replaced by renewable energy sources, and methods to increase the efficiency of the processes\ud have to be developed. Regarding the energy supply of data centres, the complex integration of different energy\ud systems into the technical infrastructure of the data centres is challenging. Within the RenewIT project [1], fourteen thermal and electrical power supply concepts for data centres have been investigated [2]. Regarding intermediate\ud results of the project, the four concepts with combined heat and power production (CHP) provide the most promising\ud solutions. One of the concepts with CHP, the system biogas-fed solid oxide fuel cell (SOFC), is presented to show\ud the methodology of modelling and simulating the CHP subsystem including non-series products with EBSILON [3].\ud The complex part load behaviour of the subsystem is identified and the information is transferred into TRNSYS [4] to\ud increase data processing and minimize computing time.Postprint (published version

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Large collector fields are increasingly being integrated into district heating systems. Due to the operation mode of these networks, the solar system must provide the desired supply temperature. Therefore, knowledge of thermal-hydraulic behavior and energy efficiency are very important for planning, operation and control. The study presents the investigation of two large-scale solar collector fields in Chemnitz (Germany).

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