Master’s & Bachelor’s Theses – HRI – Hermann-Rietschel-Institut

The Bachelor’s and Master’s theses completed at the Hermann-Rietschel-Institut since 2019 are summarised in annual tables with details of the students, the title of the thesis and the type of thesis. If you are interested in reading any of the completed theses, please contact us at kontakt(at)hri.tu-berlin.de.

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193 entries « ‹ 1 of 20 › »

2025

Chandra, Eric

A review of current status and advancement of large scale energy storage technologies for district heat networks, their operation and challenges (Bachelor Thesis)

TU Berlin, 2025.

(Abstract | BibTeX)

Henne, Philipp

Assessing the Impact of the Revised EU Energy Performance of Buildings Directive on Building Ventilation Equipment (Bachelor Thesis)

TU Berlin, 2025.

(Abstract | BibTeX)

@bachelorthesis{Henne2025,

title = {Assessing the Impact of the Revised EU Energy Performance of Buildings Directive on Building Ventilation Equipment},

author = {Philipp Henne},

year  = {2025},

date = {2025-06-01},

urldate = {2025-06-01},

school = {TU Berlin},

abstract = {The European Unions revised Energy Performance of Buildings Directive (EPBD) accelerates the decarbonisation of the building stock, where Heating, Ventilation, and Air Conditioning (HVAC) systems play a critical energy consumption role. This study assesses the impact of EU regulations, in the context of the EPBDs goals, on the energy efficiency and market characteristics of HVAC devices. A comprehensive database of HVAC products (air conditioners, residential ventilation units, heat pumps) available on the EU market was developed, primarily utilising data from the European Product Registry for Energy Labelling (EPREL) and Eurovent. Statistical analysis of key performance metrics (e.g., SEER, SCOP, SEC, eta s), refrigerant GWP trends, and an illustrative Total Cost of Ownership (TCO) calculation for heat pumps were conducted. Findings indicate a positive influence of directives like Ecodesign and Energy Labelling, particularly on high-end device efficiency. Air conditioners show a significant shift to lower GWP refrigerants and improvements in SEER, though market clustering at top energy labels is evident. Residential ventilation units also demonstrate good energy performance availability. While certified heat pumps show high efficiencies, historical trend analysis was limited by data availability. The study highlights the effectiveness of current regulations but also points to data limitations and the need for robust minimum energy performance standards (MEPS). It concludes that while operational efficiency has improved, a broader adoption of holistic metrics like TCO and Life Cycle Assessment is crucial for achieving Zero-Emission Building targets and guiding future policy and consumer choice.},

keywords = {},

pubstate = {unpublished},

tppubtype = {bachelorthesis}

}

Valenti, Rejka

Auslegung von Kompressionskaeltemaschinen in Kombination mit freier Kuehlung fuer Nichtwohngebaeude unter Beruecksichtigung von Lastprofilen (Bachelor Thesis)

TU Berlin, 2025.

(Abstract | BibTeX)

Lehmann, Max

Datengetriebene Analyse, Charakterisierung und Typisierung des Verhaltens von Fernwaerme-Hausstationen vor dem Hintergrund geaenderte Betreibsparameter (Masters Thesis)

TU Berlin, 2025.

(Abstract | BibTeX)

Hoeijmakers, Gijs

Development and evaluation of a Modelica-based digital twin for an HVAC system (Masters Thesis)

TU Berlin, 2025.

(Abstract | BibTeX)

Cohen, Eden

Dynamic Regulation of HVAC Air Heaters with Feed Forward Control (Bachelor Thesis)

TU Berlin, 2025.

(Abstract | BibTeX)

Gerecke, Noelle

Effiziente Abwaermenutzung in Gebaeudekomplexen: Eine simulationsbasierte Fallstudie am Beispiel einer Berliner Forschungseinrichtung (Masters Thesis)

TU Berlin, 2025.

(BibTeX)

Christos, Papadopoulos

Identifikation von Bewertungskriterien hinsichtlich der Integration von Quartieren in ein zellulares Energiesystem (Masters Thesis)

TU Berlin, 2025.

(Abstract | BibTeX)

Hilgendorf, Oliver

Identifikation von Regelungs- und Betriebsstrategien zur kosten- und energieeffizienten Steigerung der Raumluftqualitaet in Buerogebaeuden (Masters Thesis)

TU Berlin, 2025.

(Abstract | BibTeX)

@mastersthesis{Hilgendorf2025,

title = {Identifikation von Regelungs- und Betriebsstrategien zur kosten- und energieeffizienten Steigerung der Raumluftqualitaet in Buerogebaeuden},

author = { Oliver Hilgendorf},

year = {2025},

date = {2025-01-16},

urldate = {2025-01-16},

school = {TU Berlin},

abstract = {Indoor air quality (IAQ) is critically important, as people spend most of their time indoors. IAQ significantly impacts the health, comfort, and performance of building occupants. This study explores strategies to enhance the efficiency of providing high IAQ in non-residential buildings. The COVID-19 pandemic has underscored the need for adaptable building operation modes, allowing buildings to prioritize either energy efficiency or high IAQ depending on infection risks. Additionally, the rise of remote work and shared-desk models has led to greater variability in the occupancy rates of non-residential buildings. For these reasons, the conventional approach of designing HVAC systems based on static assumptions is increasingly insufficient. This work examines the effects of variable ventilation strategies and occupancy patterns on IAQ and energy demand in office buildings. To investigate this, a simulation study is conducted on a representative office floor under typical conditions. The study begins with a summary of the factors influencing IAQ and their impacts, based on current scientific literature. Specific IAQ evaluation criteria are then developed for application, accounting for infection risk, perceived air quality, and concentrations of relevant pollutants. A coupled simulation environment is created to model both the energy demand of buildings and IAQ. Using the Modelica modeling language, rooms are represented as homogenous zones, and the interactions between zones and the external environment are modeled using differential equations. The developed model is validated through experimental tests. The simulation study initially examines the differences between constant and demand-controlled ventilation (DCV) at typical setpoints. DCV can reduce both infection risk and required airflow; however, reduced ventilation also results in higher pollutant concentrations from building emissions. In cooling scenarios, the energy benefits of DCV are lower, as fewer opportunities for free cooling are utilized. Overall, the results show that the benefits of DCV depend greatly on the chosen evaluation criteria. The study then explores optimization potential through occupant navigation with a partial occupancy rate of 50%. A parameter study shows that the optimal strategy depends on the IAQ evaluation criterion: perceived air quality is most effectively improved when individual room occupancy aligns with design capacity and some building areas remain unconditioned. In contrast, infection risk can be minimized with lower energy expenditure by utilizing the entire office space. The simulation study demonstrates that the benefits of DCV depend on the specific IAQ metric considered, and in office buildings, it primarily offers advantages related to occupant-specific loads. For partial occupancy under the given boundary conditions, occupant navigation can achieve approximately 10% energy savings while maintaining perceived air quality if unoccupied areas remain unventilated. At the same time, full utilization of the building is recommended to reduce infection risk. These findings suggest two building operation modes, adaptable to varying infection risk levels.},

keywords = {},

pubstate = {unpublished},

tppubtype = {mastersthesis}

}

Indoor air quality (IAQ) is critically important, as people spend most of their time indoors. IAQ significantly impacts the health, comfort, and performance of building occupants. This study explores strategies to enhance the efficiency of providing high IAQ in non-residential buildings. The COVID-19 pandemic has underscored the need for adaptable building operation modes, allowing buildings to prioritize either energy efficiency or high IAQ depending on infection risks. Additionally, the rise of remote work and shared-desk models has led to greater variability in the occupancy rates of non-residential buildings. For these reasons, the conventional approach of designing HVAC systems based on static assumptions is increasingly insufficient. This work examines the effects of variable ventilation strategies and occupancy patterns on IAQ and energy demand in office buildings. To investigate this, a simulation study is conducted on a representative office floor under typical conditions. The study begins with a summary of the factors influencing IAQ and their impacts, based on current scientific literature. Specific IAQ evaluation criteria are then developed for application, accounting for infection risk, perceived air quality, and concentrations of relevant pollutants. A coupled simulation environment is created to model both the energy demand of buildings and IAQ. Using the Modelica modeling language, rooms are represented as homogenous zones, and the interactions between zones and the external environment are modeled using differential equations. The developed model is validated through experimental tests. The simulation study initially examines the differences between constant and demand-controlled ventilation (DCV) at typical setpoints. DCV can reduce both infection risk and required airflow; however, reduced ventilation also results in higher pollutant concentrations from building emissions. In cooling scenarios, the energy benefits of DCV are lower, as fewer opportunities for free cooling are utilized. Overall, the results show that the benefits of DCV depend greatly on the chosen evaluation criteria. The study then explores optimization potential through occupant navigation with a partial occupancy rate of 50%. A parameter study shows that the optimal strategy depends on the IAQ evaluation criterion: perceived air quality is most effectively improved when individual room occupancy aligns with design capacity and some building areas remain unconditioned. In contrast, infection risk can be minimized with lower energy expenditure by utilizing the entire office space. The simulation study demonstrates that the benefits of DCV depend on the specific IAQ metric considered, and in office buildings, it primarily offers advantages related to occupant-specific loads. For partial occupancy under the given boundary conditions, occupant navigation can achieve approximately 10% energy savings while maintaining perceived air quality if unoccupied areas remain unventilated. At the same time, full utilization of the building is recommended to reduce infection risk. These findings suggest two building operation modes, adaptable to varying infection risk levels.

Li, Shangran

Kalibrierung von mehreren Low-Budget-Gassensoren und Analyse der Lueftungswirksamkeit fuer verschiedene Emitterpositionen mit nur einem Tracergas (Masters Thesis)

TU Berlin, 2025.

(Abstract | BibTeX)

@mastersthesis{Li2025,

title = {Kalibrierung von mehreren Low-Budget-Gassensoren und Analyse der Lueftungswirksamkeit fuer verschiedene Emitterpositionen mit nur einem Tracergas},

author = { Shangran Li},

year  = {2025},

date = {2025-01-07},

urldate = {2025-01-07},

school = {TU Berlin},

abstract = {In unserem Leben verbringen wir viel Zeit im Innenraum, was zu einer besonderen Bedeutung der Luftqualitaet im Innenraum fuehrt. Die Luftqualitaet beeinflusst nicht nur die Gesundheit und den Komfort, sondern auch die Arbeitseffizienz und die Lebensqualitaet [1]. Um die Luftqualitaet zu messen und zu bewerten, wird heutzutage die Tracegas-Methode oft verwendet [2]. Im Labor des HRI stehen vier NDIR-Sensoren zur Verfuegung. In dieser Arbeit wurden diese Low-Budget-Sensoren kalibriert. Mit Hilfe der Tracergas-Methode wurden die Lueftungswirksamkeit (CRE) und die lokale Lueftungswirksamkeit (LAQI) fuer unterschiedliche Emittierpositionen untersucht. Das gesamte Experiment besteht aus der Kalibrierung der Sersoren, den stationaeren Messungen und den instationaeren Messungen. Bei der Kalibrierung wurde ein Referenzsensor durch den Vergleich seiner Messwerte und theoretischer Werte ausgewaehlt. Die anderen Sensoren wurden an diesem Referenzsensor kalibriert. Nach der Kalibrierung erreichten die Sensoren VYU und 21kv eine Reduktion von ueber 70 % bei MAE und RMSE. Der Sensor VZ2 zeigte eine Reduktion bei MAE zwischen 50 % und 59 % und bei RMSE zwischen 45 % und 57 %. Bei den stationaeren Messungen hatte die Position der Tracegasquelle einen signifikanten Einfluss auf die CRE. Wenn sich die Tracergasquelle in der Mitte befand, erreichte die CRE einen hohen Medianwert von 90 %. Befand sich die Tracergasquelle in der Nahe des Monitors, sank der Medianwert der CRE auf 83 %. Daher hatte die Tracergasposition keine grosse Auswirkungen auf die LAQI an den Positionen Mittel und Nahe am Monitor. Wenn sich die Tracergasquelle in der Mitte befindet, ist die LAQI an der vom Monitor entfernten Position um 7 % niedriger als der Medianwert bei einer nahe am Monitor positionierten Tracergasquelle. Die instationaeren Messungen wurden anhand der Reaktionszeit und der Seigung ausgewertet. Wenn sich die Tracergasquelle vor dem Sensor befand, zeigte dieser Sensor die kuerzeste Reaktionszeit. Die Reaktionszeit war die laengste, wenn die Tracergasquelle in der Abluft positioniert wurde. Die Steigung der Sensoren wurde durch die Tracergasposition kaum beeinflusst, wobei der vom Monitor entfernte Sensor die steilste Steigung zeigte.},

keywords = {},

pubstate = {unpublished},

tppubtype = {mastersthesis}

}

In unserem Leben verbringen wir viel Zeit im Innenraum, was zu einer besonderen Bedeutung der Luftqualitaet im Innenraum fuehrt. Die Luftqualitaet beeinflusst nicht nur die Gesundheit und den Komfort, sondern auch die Arbeitseffizienz und die Lebensqualitaet [1]. Um die Luftqualitaet zu messen und zu bewerten, wird heutzutage die Tracegas-Methode oft verwendet [2]. Im Labor des HRI stehen vier NDIR-Sensoren zur Verfuegung. In dieser Arbeit wurden diese Low-Budget-Sensoren kalibriert. Mit Hilfe der Tracergas-Methode wurden die Lueftungswirksamkeit (CRE) und die lokale Lueftungswirksamkeit (LAQI) fuer unterschiedliche Emittierpositionen untersucht. Das gesamte Experiment besteht aus der Kalibrierung der Sersoren, den stationaeren Messungen und den instationaeren Messungen. Bei der Kalibrierung wurde ein Referenzsensor durch den Vergleich seiner Messwerte und theoretischer Werte ausgewaehlt. Die anderen Sensoren wurden an diesem Referenzsensor kalibriert. Nach der Kalibrierung erreichten die Sensoren VYU und 21kv eine Reduktion von ueber 70 % bei MAE und RMSE. Der Sensor VZ2 zeigte eine Reduktion bei MAE zwischen 50 % und 59 % und bei RMSE zwischen 45 % und 57 %. Bei den stationaeren Messungen hatte die Position der Tracegasquelle einen signifikanten Einfluss auf die CRE. Wenn sich die Tracergasquelle in der Mitte befand, erreichte die CRE einen hohen Medianwert von 90 %. Befand sich die Tracergasquelle in der Nahe des Monitors, sank der Medianwert der CRE auf 83 %. Daher hatte die Tracergasposition keine grosse Auswirkungen auf die LAQI an den Positionen Mittel und Nahe am Monitor. Wenn sich die Tracergasquelle in der Mitte befindet, ist die LAQI an der vom Monitor entfernten Position um 7 % niedriger als der Medianwert bei einer nahe am Monitor positionierten Tracergasquelle. Die instationaeren Messungen wurden anhand der Reaktionszeit und der Seigung ausgewertet. Wenn sich die Tracergasquelle vor dem Sensor befand, zeigte dieser Sensor die kuerzeste Reaktionszeit. Die Reaktionszeit war die laengste, wenn die Tracergasquelle in der Abluft positioniert wurde. Die Steigung der Sensoren wurde durch die Tracergasposition kaum beeinflusst, wobei der vom Monitor entfernte Sensor die steilste Steigung zeigte.

193 entries « ‹ 1 of 20 › »