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2024

EXERGY-BASED METHODS FOR HEAT PUMPS

Hofmann, M., Freißmann, J., Fritz, M., Alexe, J. H., Witte, F., & Tsatsaronis, G. (2024). EXERGY-BASED METHODS FOR HEAT PUMPS. In Proceedings of the 7th International Seminar on ORC Power System (ORC 2023) (S. 553–562). Editorial Universidad de Sevilla. http://doi.org/10.12795/9788447227457_92
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Freißmann, Jonas

Fritz, Malte

Witte, Francesco
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2024

Book Chapter

Mathias Hofmann

Jonas Freißmann

Malte Fritz

Jeremias Alexe

Francesco Witte

George Tsatsaronis

2023

Free and Open-Source Teaching: Understanding Exergy Using Thermal Engineering Systems in Python (TESPy)

Hofmann, M., Witte, F., Fritz, M., Freißmann, J., Tuschy, I., & Tsatsaronis, G. (2023). Free and Open-Source Teaching: Understanding Exergy Using Thermal Engineering Systems in Python (TESPy). In 36th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems (ECOS 2023) (Bd. 2023, S. 195–209). Curran Associates, Inc. http://doi.org/10.52202/069564-0019
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Witte, Francesco

Fritz, Malte

Freißmann, Jonas

Tuschy, Ilja

Profilbereich

Erneuerbare Energien und nachhaltige Entwicklung

Forschungsfeld

Wärme

Fachbereich

Fachbereich 2: Energy and Life Science
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2023

Conference Paper

Mathias Hofmann

Francesco Witte

Malte Fritz

Jonas Freißmann

Ilja Tuschy

George Tsatsaronis

Thermodynamic Analysis

Exergy

simulation

Python

TESPy

Teaching

2022

Parametric optimization and comparative study of an organic Rankine cycle power plant for two-phase geothermal sources

Chen, C., Witte, F., Tuschy, I., Kolditz, O., & Shao, H. (2022). Parametric optimization and comparative study of an organic Rankine cycle power plant for two-phase geothermal sources. Energy, 123910. http://doi.org/https://doi.org/10.1016/j.energy.2022.123910

Abstract

For two-phase geothermal sources, Organic Rankine Cycle (ORC) based binary plant is often applied for power production. In this work, a network topology is designed with the open-source Thermal Engineering Systems in Python (TESPy) software to simulate the stationary operation of the ORC plant. With this topology, the performance of six different working fluids are compared. From the thermodynamic perspective, the gross and net power output are optimized respectively. Results show that R600 has the highest gross power output of 17.55 MW, while R245fa has the highest net power output of 12.93 MW. However, the turbine inlet temperatures for these two working fluids need to be designed at the upper theoretical limit. R245ca and R601a require the heat exchange rates of internal heat exchanger to be larger than 1.51 MW and 0.99 MW to satisfy the re-injection temperature limit, which are smaller than the R600 (6.7 MW) and R245fa (6.0 MW) cases. Besides, the working fluid with lower critical state is preferred for a geothermal source with smaller steam fraction to establish a stable ORC plant. The workflow for the ORC design and optimization in this work is generic, and can be further applied to thermo-economic investigation.
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Witte, Francesco

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Erneuerbare Energien und nachhaltige Entwicklung

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Fachbereich 2: Energy and Life Science
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2022

Journal Article

Chaofan Chen

Francesco Witte

Ilja Tuschy

Olaf Kolditz

Haibing Shao

Organic Rankine cycle (ORC)

Geothermal power plant

Two-phase geothermal sources

Design and optimization

Thermal engineering systems in python (TESPy)

OpenGeoSys (OGS)
Generic and Open-Source Exergy Analysis - Extending the Simulation Framework TESPy

Witte, F., Hofmann, M., Meier, J., Tuschy, I., & Tsatsaronis, G. (2022). Generic and Open-Source Exergy Analysis - Extending the Simulation Framework TESPy. Energies, 15. http://doi.org/10.3390/en15114087

Abstract

Exergy-based methods support the identification of thermodynamic inefficiencies and the discovery of optimization potentials in thermal engineering applications. Although a large variety of simulation software is available in this field, most do not offer an integrated solution for exergy analysis. While there are commercial products on the market with such capabilities, their access for research and educational purposes is limited. The presented open-source software offers an integrated and fully automated exergy analysis tool for thermal conversion processes. In a first step, physical exergy is implemented, and the tool is then applied to three different example plants to highlight its capabilities and validate the implementation: A solar thermal power plant, a supercritical CO2 power cycle, and an air refrigeration cycle. The respective models and the results of the analyses are presented briefly. By providing the results in modern data structures, they are easily accessible and postprocessible. Future work will include chemical exergy to enable analyses of applications with conversion of matter. Additionally, the implementation of the exergoeconomic analysis and optimization is envisaged.
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Witte, Francesco

Tuschy, Ilja

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Erneuerbare Energien und nachhaltige Entwicklung

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Wärme

Fachbereich

Fachbereich 2: Energy and Life Science
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2022

Journal Article

Francesco Witte

Mathias Hofmann

Julius Meier

Ilja Tuschy

George Tsatsaronis
Thermal Engineering Systems in Python (TESPy): The implementation and validation of the chemical exergy

Hofmann, M., Witte, F., Shawky, K., Tuschy, I., & Tsatsaronis, G. (2022). Thermal Engineering Systems in Python (TESPy): The implementation and validation of the chemical exergy. In ECOS 2022 35th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems (Bd. 2022, S. 257–269). DTU Construct. http://doi.org/10.11581/dtu.00000267
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Witte, Francesco

Tuschy, Ilja

Profilbereich

Erneuerbare Energien und nachhaltige Entwicklung

Forschungsfeld

Wärme

Fachbereich

Fachbereich 2: Energy and Life Science
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2022

Conference Paper

Mathias Hofmann

Francesco Witte

Karim Shawky

Ilja Tuschy

George Tsatsaronis

Thermodynamic Analysis

Exergy

simulation

Python

Energy Conversion Process

TESPy

2021

Long-term thermal imbalance in large borehole heat exchangers array - A numerical study based on the Leicester project

Chen, S., Cai, W., Witte, F., Wang, X., Wang, F., Kolditz, O., & Shao, H. (2021). Long-term thermal imbalance in large borehole heat exchangers array - A numerical study based on the Leicester project. Energy and Buildings, 231, 110518. http://doi.org/10.1016/j.enbuild.2020.110518 (Original work published 2026)
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Witte, Francesco

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Fachbereich 2: Energy and Life Science
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2021

Journal Article

Shuang Chen

Wanlong Cai

Francesco Witte

Xuerui Wang

Fenghao Wang

Olaf Kolditz

Haibing Shao
Integration unterirdischer Speichertechnologien in die Energiesystemtransformation am Beispiel des Modellgebietes Schleswig-Holstein - ANGUS II : Schlussbericht zum Verbundvorhaben Teilprojekt Simulation energietechnischer Einzelanlagen

Boysen, C., Kaldemeyer, C., Sadat, F., Tuschy, I., Witte, F., Bauer, S., & Dahmke, A. (2021). Integration unterirdischer Speichertechnologien in die Energiesystemtransformation am Beispiel des Modellgebietes Schleswig-Holstein - ANGUS II : Schlussbericht zum Verbundvorhaben Teilprojekt Simulation energietechnischer Einzelanlagen. Hochschule Flensburg. Abgerufen von https://www.tib.eu/de/suchen/id/TIBKAT%3A1798315475
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Tuschy, Ilja

Witte, Francesco

Profilbereich

Erneuerbare Energien und nachhaltige Entwicklung

Forschungsfeld

Wärme

Netzintegration

Fachbereich

Fachbereich 2: Energy and Life Science
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2021

Miscellaneous

Cynthia Boysen

Cord Kaldemeyer

Fahim Sadat

Ilja Tuschy

Francesco Witte

Sebastian Bauer

Andreas Dahmke
fluprodia (Fluid Property Diagram)

Witte, F. (2021). fluprodia (Fluid Property Diagram). Zenodo. http://doi.org/10.5281/ZENODO.3795771
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2021

Miscellaneous

Francesco Witte

Fluid Property Diagram

Thermodynamics

Phases

Isoline
Subsurface renewable energy storage capacity for hydrogen, methane and compressed air – A performance assessment study from the North German Basin

Gasanzade, F., Pfeiffer, W. T., Witte, F., Tuschy, I., & Bauer, S. (2021). Subsurface renewable energy storage capacity for hydrogen, methane and compressed air – A performance assessment study from the North German Basin. Renewable and Sustainable Energy Reviews, 149, 111422. http://doi.org/https://doi.org/10.1016/j.rser.2021.111422

Abstract

The transition to renewable energy sources to mitigate climate change will require large-scale energy storage to dampen the fluctuating availability of renewable sources and to ensure a stable energy supply. Energy storage in the geological subsurface can provide capacity and support the cycle times required. This study investigates hydrogen storage, methane storage and compressed air energy storage in subsurface porous formations and quantifies potential storage capacities as well as storage rates on a site-specific basis. For part of the North German Basin, used as the study area, potential storage sites are identified, employing a newly developed structural geological model. Energy storage capacities estimated from a volume-based approach are 6510 TWh and 24,544 TWh for hydrogen and methane, respectively. For a consistent comparison of storage capacities including compressed air energy storage, the stored exergy is calculated as 6735 TWh, 25,795 TWh and 358 TWh for hydrogen, methane and compressed air energy storage, respectively. Evaluation of storage deliverability indicates that high deliverability rates are found mainly in two of the three storage formations considered. Even accounting for the uncertainty in geological parameters, the storage potential for the three considered storage technologies is significantly larger than the predicted demand, and suitable storage rates are achievable in all storage formations.
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Witte, Francesco

Tuschy, Ilja

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Erneuerbare Energien und nachhaltige Entwicklung

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Netzintegration

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Fachbereich 2: Energy and Life Science
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2021

Journal Article

Firdovsi Gasanzade

Wolf Pfeiffer

Francesco Witte

Ilja Tuschy

Sebastian Bauer

Subsurface energy storage

Storage capacity

Exergy assessment

North German Basin

Geological porous media

Compressed air energy storage

Hydrogen gas storage

Methane gas storage

Achievable storage rate
Coupled power plant and geostorage simulations of porous media compressed air energy storage (PM-CAES)

Pfeiffer, W. T., Witte, F., Tuschy, I., & Bauer, S. (2021). Coupled power plant and geostorage simulations of porous media compressed air energy storage (PM-CAES). Energy Conversion and Management, 249, 114849. http://doi.org/https://doi.org/10.1016/j.enconman.2021.114849

Abstract

Porous media compressed air energy storage (PM-CAES) systems that use porous geological formations such as sandstone may provide large storage capacities in future energy systems based primarily on fluctuating renewable energy sources. In CAES systems, the instantaneous power and stored energy are closely linked to the storage pressure and the mass flow rate achievable in the geological reservoir. Therefore, a coupled simulator that accurately represents the power plant, the geostorage site, and their interactions during all potential PM-CAES system operation modes is presented in this paper. Using adiabatic and diabatic power plant topology test designs, strong feedback between the achievable storage rates and capacities of the chosen power plant design and geostorage site are found, thus confirming the benefit of this integrated modelling approach. Using a generic, highly cyclic load profile for daily peak shaving with charging and discharging rates of 100 MW and an adiabatic power plant topology, it is found that all discharging targets can be met but the achievable charging rates decrease to approximately 95 MW due to increased pressure in the geostorage after approximately 10 cycles. When a diabatic power plant design is considered, a long-term decrease in the geostorage pressure is found. Correspondingly, the charging power always meets the specifications, while the discharging power decreases slowly from the 20th storage cycle onwards to 79 MW in the 31st cycle. The newly developed simulation tool thus allows one to predict achievable power rates and geostorage pressures for PM-CAES systems, enabling the identification of efficient PM-CAES designs.
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Witte, Francesco

Tuschy, Ilja

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Erneuerbare Energien und nachhaltige Entwicklung

Forschungsfeld

Wärme

Netzintegration

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Fachbereich 2: Energy and Life Science
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2021

Journal Article

Wolf Pfeiffer

Francesco Witte

Ilja Tuschy

Sebastian Bauer

PM-CAES

Compressed air energy storage

Geological storage

Coupled simulations

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