---
_id: '59239'
abstract:
- lang: ger
  text: Diese Arbeit behandelt die Modellierung und Optimierung von mit Phasenwechselmaterialien
    (PCM) ausgestatteten, energietechnischen Komponenten anhand zweier Fallstudien.
    PCM sind Materialien, deren Phasenwechseleigenschaften während des Schmelzens
    und Erstarrens für Heiz- und Kühlzwecke genutzt werden. Zunächst werden die theoretischen
    Grundlagen zu Wärmeübertragungsproblemen mit Phasenwechsel erörtert und entsprechende
    numerische Lösungsmethoden diskutiert. Ein Modell für Phasenwechselvorgänge wird
    vorgestellt, welches anhand analytischer Lösungen validiert wurde und in den Fallstudien
    zum Einsatz kam. Für beide Fallstudien wird der Stand der Technik erörtert und
    die entsprechenden Forschungsfragen werden formuliert. Die erste Fallstudie behandelt
    PCM-integrierte Photovoltaikmodule und die zweite Festbett-Latentwärmespeicher,
    welche nicht-kugelförmiger PCM-Kapseln verwenden. Für beide Systeme wurden thermische
    Model-le entwickelt und anhand experimenteller Daten mit guter Genauigkeit validiert.
    Diese Modelle wurden in Parameterstudien eingesetzt, um optimierte Systemkonfigurationen
    zu identifizieren. Die vorgestellten Ergebnisse zeigen, dass ein PCM-Kühlkörper
    mit ausreichender Dicke und Wärmeleitfähigkeit den Wirkungsgrad und die Lebensdauer
    von Photovoltaikmodulen erheblich erhöht. Darüber hinaus verbessern PCM-Kapseln
    mit hoher Packungs-dichte und Oberfläche sowohl die volumenspezifische Speicherkapazität
    als auch die thermische Leistung von Festbett-Latentwärmespeichern.
- lang: eng
  text: This thesis explores the modeling and optimization of energy system components
    incorporating phase change materials (PCM) through two different case studies.
    PCM are materials whose phase change characteristics during melting and solidification
    are utilized for heating and cooling purposes. The theoretical foundations of
    heat transfer problems involving phase change, along with the relevant numerical
    solution methods, are discussed. A phase change model is presented, which was
    validated against analytical solutions and applied in the case studies. For both
    case studies, a review of the state of the art is provided, followed by the formulation
    of specific research problems. The first case study investigated PCM-enhanced
    photovoltaic modules, while the second focused on packed bed latent heat storages
    (PBLHS) utilizing non-spherical PCM capsules. Thermal models were developed for
    both systems and validated with good accuracy against experimental data. These
    models were employed in parameter studies to identify optimized system configurations.
    The presented results demonstrate that a PCM heat sink with sufficient thickness
    and thermal conductivity can significantly improve the efficiency and lifespan
    of photovoltaic modules. Furthermore, PCM capsules with both high packing density
    and surface area increase the volume-specific storage capacity and thermal power
    output of PBLHS.
author:
- first_name: Matti
  full_name: Grabo, Matti
  id: '66520'
  last_name: Grabo
citation:
  ama: Grabo M. <i>Modeling and Optimization of Energy System Components Equipped
    with Phase Change Materials</i>.; 2025. doi:<a href="https://doi.org/10.17619/UNIPB/1-2199">10.17619/UNIPB/1-2199</a>
  apa: Grabo, M. (2025). <i>Modeling and optimization of energy system components
    equipped with phase change materials</i>. <a href="https://doi.org/10.17619/UNIPB/1-2199">https://doi.org/10.17619/UNIPB/1-2199</a>
  bibtex: '@book{Grabo_2025, place={Paderborn}, title={Modeling and optimization of
    energy system components equipped with phase change materials}, DOI={<a href="https://doi.org/10.17619/UNIPB/1-2199">10.17619/UNIPB/1-2199</a>},
    author={Grabo, Matti}, year={2025} }'
  chicago: Grabo, Matti. <i>Modeling and Optimization of Energy System Components
    Equipped with Phase Change Materials</i>. Paderborn, 2025. <a href="https://doi.org/10.17619/UNIPB/1-2199">https://doi.org/10.17619/UNIPB/1-2199</a>.
  ieee: M. Grabo, <i>Modeling and optimization of energy system components equipped
    with phase change materials</i>. Paderborn, 2025.
  mla: Grabo, Matti. <i>Modeling and Optimization of Energy System Components Equipped
    with Phase Change Materials</i>. 2025, doi:<a href="https://doi.org/10.17619/UNIPB/1-2199">10.17619/UNIPB/1-2199</a>.
  short: M. Grabo, Modeling and Optimization of Energy System Components Equipped
    with Phase Change Materials, Paderborn, 2025.
date_created: 2025-04-02T09:25:58Z
date_updated: 2025-04-02T09:44:05Z
department:
- _id: '9'
doi: 10.17619/UNIPB/1-2199
keyword:
- Heat transfer
- PCM
- numerical simulation
- renewable energy
- heat storage
language:
- iso: eng
place: Paderborn
publication_status: published
status: public
supervisor:
- first_name: Eugeny
  full_name: Kenig, Eugeny
  id: '665'
  last_name: Kenig
title: Modeling and optimization of energy system components equipped with phase change
  materials
type: dissertation
user_id: '66520'
year: '2025'
...
---
_id: '49430'
abstract:
- lang: eng
  text: Within the current energy and environmental crisis, new material- and energy-saving
    processes are needed. For this reason, this study focuses on the development of
    a new forming technology for Ti-6Al-4V sheet metal. It is based on combination
    of solution treatment by resistive heating with rapid tool-based quenching and
    subsequent annealing. This new “TISTRAQ” process is comparable with press-hardening
    already known for steels and hot die quenching known for aluminium alloys. One
    of the main influencing factors for this process is the heat transfer coefficient
    (HTC). It is an important driver for adjustment of basic parameters, as selection
    of tool material or the forming speed but also plays an important role while elaborating
    temperature distribution in the numerical model. Therefore, a new and unique test
    rig was developed to determine the HTC and to perform tool-based heat treatment
    at specimen level under laboratory conditions. The test rig was used to investigate
    the influence of the titanium-tool-lubricant system on HTC and cooling rate. Further
    the effect of heat treatment in the test rig and tool-based quenching on microstructure
    and mechanical properties was studied. To improve the prediction of the temperature
    distribution of the titanium during cooling, the HTC was integrated into the numerical
    process simulation
author:
- first_name: Maximilian Alexander
  full_name: Kaiser, Maximilian Alexander
  id: '72351'
  last_name: Kaiser
  orcid: 0009-0008-1333-3396
- first_name: Fabian
  full_name: Höschen, Fabian
  last_name: Höschen
- first_name: Nina
  full_name: Pfeffer, Nina
  last_name: Pfeffer
- first_name: Mathias
  full_name: Merten, Mathias
  last_name: Merten
- first_name: Thomas
  full_name: Meyer, Thomas
  last_name: Meyer
- first_name: Thorsten
  full_name: Marten, Thorsten
  id: '338'
  last_name: Marten
  orcid: 0009-0001-6433-7839
- first_name: Pawel
  full_name: Rockicki, Pawel
  last_name: Rockicki
- first_name: Heinz Werner
  full_name: Höppel, Heinz Werner
  last_name: Höppel
- first_name: Thomas
  full_name: Tröster, Thomas
  id: '553'
  last_name: Tröster
citation:
  ama: 'Kaiser MA, Höschen F, Pfeffer N, et al. The new TISTRAQ process: Solution
    treatment with rapid quenching and annealing for Ti-6Al-4V sheet metal part forming
    - investigation on heat transfer coefficient and influence on cooling rates. In:
    <i>IOM3. Chapter 14: Forming, Machining &#38; Joining [Version 1; Not Peer Reviewed]</i>.
    ; 2024. doi:<a href="https://doi.org/doi.org/10.7490/f1000research.1119929.1">doi.org/10.7490/f1000research.1119929.1</a>'
  apa: 'Kaiser, M. A., Höschen, F., Pfeffer, N., Merten, M., Meyer, T., Marten, T.,
    Rockicki, P., Höppel, H. W., &#38; Tröster, T. (2024). The new TISTRAQ process:
    Solution treatment with rapid quenching and annealing for Ti-6Al-4V sheet metal
    part forming - investigation on heat transfer coefficient and influence on cooling
    rates. <i>IOM3. Chapter 14: Forming, Machining &#38; Joining [Version 1; Not Peer
    Reviewed]</i>. 15th World Conference on Titanium, Edinburgh. <a href="https://doi.org/doi.org/10.7490/f1000research.1119929.1">https://doi.org/doi.org/10.7490/f1000research.1119929.1</a>'
  bibtex: '@inproceedings{Kaiser_Höschen_Pfeffer_Merten_Meyer_Marten_Rockicki_Höppel_Tröster_2024,
    title={The new TISTRAQ process: Solution treatment with rapid quenching and annealing
    for Ti-6Al-4V sheet metal part forming - investigation on heat transfer coefficient
    and influence on cooling rates}, DOI={<a href="https://doi.org/doi.org/10.7490/f1000research.1119929.1">doi.org/10.7490/f1000research.1119929.1</a>},
    booktitle={IOM3. Chapter 14: Forming, Machining &#38; Joining [version 1; not
    peer reviewed]}, author={Kaiser, Maximilian Alexander and Höschen, Fabian and
    Pfeffer, Nina and Merten, Mathias and Meyer, Thomas and Marten, Thorsten and Rockicki,
    Pawel and Höppel, Heinz Werner and Tröster, Thomas}, year={2024} }'
  chicago: 'Kaiser, Maximilian Alexander, Fabian Höschen, Nina Pfeffer, Mathias Merten,
    Thomas Meyer, Thorsten Marten, Pawel Rockicki, Heinz Werner Höppel, and Thomas
    Tröster. “The New TISTRAQ Process: Solution Treatment with Rapid Quenching and
    Annealing for Ti-6Al-4V Sheet Metal Part Forming - Investigation on Heat Transfer
    Coefficient and Influence on Cooling Rates.” In <i>IOM3. Chapter 14: Forming,
    Machining &#38; Joining [Version 1; Not Peer Reviewed]</i>, 2024. <a href="https://doi.org/doi.org/10.7490/f1000research.1119929.1">https://doi.org/doi.org/10.7490/f1000research.1119929.1</a>.'
  ieee: 'M. A. Kaiser <i>et al.</i>, “The new TISTRAQ process: Solution treatment
    with rapid quenching and annealing for Ti-6Al-4V sheet metal part forming - investigation
    on heat transfer coefficient and influence on cooling rates,” presented at the
    15th World Conference on Titanium, Edinburgh, 2024, doi: <a href="https://doi.org/doi.org/10.7490/f1000research.1119929.1">doi.org/10.7490/f1000research.1119929.1</a>.'
  mla: 'Kaiser, Maximilian Alexander, et al. “The New TISTRAQ Process: Solution Treatment
    with Rapid Quenching and Annealing for Ti-6Al-4V Sheet Metal Part Forming - Investigation
    on Heat Transfer Coefficient and Influence on Cooling Rates.” <i>IOM3. Chapter
    14: Forming, Machining &#38; Joining [Version 1; Not Peer Reviewed]</i>, 2024,
    doi:<a href="https://doi.org/doi.org/10.7490/f1000research.1119929.1">doi.org/10.7490/f1000research.1119929.1</a>.'
  short: 'M.A. Kaiser, F. Höschen, N. Pfeffer, M. Merten, T. Meyer, T. Marten, P.
    Rockicki, H.W. Höppel, T. Tröster, in: IOM3. Chapter 14: Forming, Machining &#38;
    Joining [Version 1; Not Peer Reviewed], 2024.'
conference:
  end_date: 2023-06-16
  location: Edinburgh
  name: 15th World Conference on Titanium
  start_date: 2023-06-12
date_created: 2023-12-04T10:00:21Z
date_updated: 2025-05-19T11:46:47Z
department:
- _id: '9'
- _id: '321'
- _id: '149'
doi: doi.org/10.7490/f1000research.1119929.1
keyword:
- Interfacial heat transfer coefficient
- Ti-6Al-4V
- nonisothermal forming
- thermomechanical processing
- TISTRAQ process
language:
- iso: eng
publication: 'IOM3. Chapter 14: Forming, Machining & Joining [version 1; not peer
  reviewed]'
publication_status: published
quality_controlled: '1'
status: public
title: 'The new TISTRAQ process: Solution treatment with rapid quenching and annealing
  for Ti-6Al-4V sheet metal part forming - investigation on heat transfer coefficient
  and influence on cooling rates'
type: conference
user_id: '72351'
year: '2024'
...
---
_id: '49433'
author:
- first_name: Maximilian Alexander
  full_name: Kaiser, Maximilian Alexander
  id: '72351'
  last_name: Kaiser
  orcid: 0009-0008-1333-3396
- first_name: Pawel
  full_name: Rockicki, Pawel
  last_name: Rockicki
- first_name: Fabian
  full_name: Höschen, Fabian
  last_name: Höschen
- first_name: Jan-Niklas
  full_name: Wesendahl, Jan-Niklas
  last_name: Wesendahl
- first_name: Stefan
  full_name: Konrad, Stefan
  last_name: Konrad
- first_name: Thomas
  full_name: Meyer, Thomas
  last_name: Meyer
- first_name: Thorsten
  full_name: Marten, Thorsten
  id: '338'
  last_name: Marten
  orcid: 0009-0001-6433-7839
- first_name: Thomas
  full_name: Tröster, Thomas
  id: '553'
  last_name: Tröster
citation:
  ama: 'Kaiser MA, Rockicki P, Höschen F, et al.  Heat transfer coefficient investigation
    for hot die quenching process of Ti-6Al-4V alloy. In: ; 2022.'
  apa: Kaiser, M. A., Rockicki, P., Höschen, F., Wesendahl, J.-N., Konrad, S., Meyer,
    T., Marten, T., &#38; Tröster, T. (2022). <i> Heat transfer coefficient investigation
    for hot die quenching process of Ti-6Al-4V alloy</i>. Titanium USA 2022 Conference
    , Orlando.
  bibtex: '@inproceedings{Kaiser_Rockicki_Höschen_Wesendahl_Konrad_Meyer_Marten_Tröster_2022,
    title={ Heat transfer coefficient investigation for hot die quenching process
    of Ti-6Al-4V alloy}, author={Kaiser, Maximilian Alexander and Rockicki, Pawel
    and Höschen, Fabian and Wesendahl, Jan-Niklas and Konrad, Stefan and Meyer, Thomas
    and Marten, Thorsten and Tröster, Thomas}, year={2022} }'
  chicago: Kaiser, Maximilian Alexander, Pawel Rockicki, Fabian Höschen, Jan-Niklas
    Wesendahl, Stefan Konrad, Thomas Meyer, Thorsten Marten, and Thomas Tröster. “
    Heat Transfer Coefficient Investigation for Hot Die Quenching Process of Ti-6Al-4V
    Alloy,” 2022.
  ieee: M. A. Kaiser <i>et al.</i>, “ Heat transfer coefficient investigation for
    hot die quenching process of Ti-6Al-4V alloy,” presented at the Titanium USA 2022
    Conference , Orlando, 2022.
  mla: Kaiser, Maximilian Alexander, et al. <i> Heat Transfer Coefficient Investigation
    for Hot Die Quenching Process of Ti-6Al-4V Alloy</i>. 2022.
  short: 'M.A. Kaiser, P. Rockicki, F. Höschen, J.-N. Wesendahl, S. Konrad, T. Meyer,
    T. Marten, T. Tröster, in: 2022.'
conference:
  end_date: 2022-10-12
  location: Orlando
  name: 'Titanium USA 2022 Conference '
  start_date: 2022-10-09
date_created: 2023-12-04T10:17:16Z
date_updated: 2025-05-19T11:46:03Z
department:
- _id: '9'
- _id: '321'
- _id: '149'
keyword:
- Ti-6Al-4V
- heat transfer coefficient
language:
- iso: eng
status: public
title: ' Heat transfer coefficient investigation for hot die quenching process of
  Ti-6Al-4V alloy'
type: conference_abstract
user_id: '72351'
year: '2022'
...