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Gewählte Master / Diploma Thesis:

David Kilian (2017): Techno-ökonomische Evaluierung der Warmwasserversorgung eines öffentlichen Dienstleistungsgebäudes.
Master / Diploma Thesis - Institut für Verfahrens- und Energietechnik (IVET), BOKU-Universität für Bodenkultur, pp 123. UB BOKU obvsg

Data Source: ZID Abstracts
Domestic hot water heating is an important component of energy consumption in the building sector. In cases of low to medium hot water consumption, centralized hot water installations achieve only poor efficiency. The aim of this master thesis is to analyse the domestic hot water production in a public service building and the subsequent optimization. The energy consumption for hot water supply is measured over a period of 104 days. The consumption of hot water and the efficiency of the hot water system are recorded for a period of 46 days. The electric energy usage of pumps and temperatures in the hot water system are documented as well. The determined energy efficiency of the existing hot water system is very low at 10.7 %. Reducing the pump operation time at the weekend and shutting down a hot water storage can improve the efficiency to 14.2 %. However, the risk of Legionella growth also increases due to the lower hot water temperature. A further possibility for improving the hot water system is the conversion to electric point-of-use water heaters. This can reduce energy losses almost completely. Nevertheless, the existing hot water preparation by district heating needs less primary energy and generates fewer CO2 emissions. The economic analysis shows, that there is a large cost savings potential through the optimization measures. So the investment in a new decentralized water heating system is recommended from an economic point of view. Furthermore the sensitivity analysis confirms the economic advantages of the point-of-use water preparation even under poor conditions.

Beurteilende(r): Pröll Tobias
1.Mitwirkender: Kotik Jan

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