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Assessment of probabilistic distributed factors influencing renewable energy supply for hotels using Monte-Carlo methods
(2017-04-05)
This paper investigates the use of renewable energies to supply hotels in island regions. The aim is to evaluate the effect of weather and occupancy fluctuations on the sensitivity of investment criteria. The sensitivity of the chosen energy system is examined using a Monte Carlo simulation considering stochastic weather data, occupancy rates and energy needs. For this purpose, algorithms based on measured data are developed and applied to a case study on the Canary Islands.
The results underline that electricity ...
Dissertation
Methodology development and assessment of lower carbon industrial process heat through solar energy and heat pumps
(2018-05-24)
The reduction of energy consumption in industrial processes, notably within low temperature industries, leads to greater economic gain and lower carbon emissions. Numerous energy audits and case studies within the food and beverage industry suggest that initial efforts to reduce energy consumption should focus on energy efficiency measures such as heat recovery and process optimization due to their lower cost of implementation. Eventually, however, an efficiency limit is reached and the only way to further reduce ...
Dissertation
Experimental investigations of water filled drainback systems
(2017-08-16)
Selbstentleerende- bzw. Drainback-Anlagen (DBA) bieten einen einfachen Schutz vor Stagnation und Einfrieren des Wärmeträgerfluids und des gesamten Solarthermiesystems. Im Vergleich zu konventionell betriebenen Solaranlagen beinhalten DBA zudem weniger hydraulische Komponenten im Solarkreis. Dies führt zur Reduzierung sowohl der Investitions- als auch der Wartungskosten. Trotz der vielen Vorteile sind DBA bisher nur selten wissenschaftlich untersucht.
Im Fokus der vorliegenden Dissertation liegen die grundlegenden ...
Dissertation
Construction and Analysis of Heat-and Mass Exchangers for Liquid Desiccant Systems
(2017-08-21)
Construction and Analysis of Heat-and Mass Exchangers for Liquid Desiccant Systems
Novel flat plate and tube-bundle heat and mass exchangers were designed, built, and experimentally examined in combination with an aqueous solution of lithium chloride as a desiccant. Prior to the construction of the components, two test rigs were built for the evaluation of several textiles and liquid desiccant distributors.
The first test rig was used for the evaluation of liquid desiccant wicking performance of different fabrics. ...
Dissertation
Unsicherheiten von Ertragsprognosen für Photovoltaik-Kraftwerke unter besonderer Berücksichtigung langfristiger Variationen des Solarstrahlungs-Potenzials
(2018-08-27)
Ziel dieser Arbeit ist die realistische Quantifizierung der bei der Erstellung von Ertragsprognosen auftretenden Unsicherheiten unter besonderer Berücksichtigung langfristiger Variationen des Solarstrahlungs-Potenzials. Daneben sollten mögliche Verbesserungs-Potenziale zur Prognose der Erträge von PV-Kraftwerken identifiziert und umgesetzt werden. Dazu wird zunächst die Konzeption und Methodik von Ertragsgutachten für PV-Kraftwerke systematisch erfasst und beschrieben. Die relevanten ...