Paper Conference

Proceedings of BauSim Conference 2008: 2nd Conference of IBPSA-Germany and Austria


Solares Kühlen von Büro- und Serverräumen

Michael Krause, Christoph Lauterbach, Jan Kaiser, Dietrich Schmidt

Abstract: Due to high internal loads caused by staff and electronic devices and due to high solar gains through large glazing areas, air conditioning to guarantee comfort conditions is required in office buildings even in Germany. Even for passive buildings with very high insulation standards and ventilation systems, additional measures have to be addressed to prevent overheating inside the building. Server rooms which have high internal loads and need to be kept on relatively low room temperatures require active cooling systems. Since most of the air conditioning systems installed are using electrically driven vapour compression machines, increased cooling demand is leading to high energy demands with large consumptions of fossil fuels. A very promising alternative are thermally driven cooling machines. These are either represented by absorption and adsorption chillers for the production of cold water or open sorption systems with solid or liquid desiccants. Due to a good matching of cooling demand and solar radiation, the use of solar energy to drive the process represents a promising alternative. European wide, about 120 systems have been installed so far. However, the cooling demand of server rooms is relatively constant over the year and independent on the solar radiation. Usually only at night time and on weekends the server activity and thus its cooling demand is reduced. Thus, in order to apply solar thermal cooling to an office building integrating server cooling, new system concepts have to be developed. These concepts require additional cooling sources, thermal storage and optimized control strategies. The latter is especially important if the cooling of office and server rooms is supplied by a single cold production system. Regarding this, possible concepts for solar cooling of office and server rooms have been developed and evaluated depending on the system design.
Pages: 69 - 69