Jan Seiler

Last Name

Seiler

First Name

Jan

ORCID

0000-0002-8461-7993

Organisational unit

01159 - Lehre Maschinenbau und Verfahrenstechnik

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Publications1 - 10 of 61

Feeding Brightway with data – Automated data extraction from chemical process simulations into LCA software
Spiekermann, Lukas; Sewani, Hitesh; Lochmann, Sebastian; et al. (2025)
Mitigating climate change requires the development of new chemical processes (Shukla et al., 2022). Confirming their climate benefits requires life cycle assessment (LCA). Still, in practice, LCAs of chemical processes are often conducted by manually extracting data from process simulation software and transferring it to LCA tools (Köck et al., 2023). This manual approach is time-consuming, susceptible to human error (Azzaro-Pantel et al., 2022), and may overlook process flows that appear negligible but can substantially affect the environmental impacts (Rosental et al., 2020). Here, we present the tool ALCHEMIA (Automated Life Cycle extraction from cHEMical process models Into Assessments) that addresses these challenges by automatically connecting chemical process simulations with the Brightway environment (Mutel, 2017). A graphical user interface facilitates mapping process streams to life cycle inventories, while data handling is performed in the background. We demonstrate the tool based on bio-based and CO2-based process studies available in the literature. These studies are implemented in several flow sheeting software packages, including Aspen Plus, Aspen HYSYS, and AVEVA Process Simulation. We show the rapid generation of LCA results based on existing process simulation studies and highlight the importance of holistic LCA to account for all relevant streams. Overall, ALCHEMIA streamlines data handling in LCA of chemical process simulations by unlocking automated data transfer to the LCA software environment Brightway.
Environmental impacts from Carbon Capture, Transport and Storage: Learnings from early-mover chains in the DemoUpCARMA-project
Nöhl, Julian; Burger, Johannes; Oeuvray, Pauline; et al. (2023)
Environmental impact of pioneering carbon capture, transport and storage chains
Burger, Johannes; Nöhl, Julian; Seiler, Jan; et al. (2022)
SSRN ~ Proceedings of the 16th Greenhouse Gas Control Technologies Conference (GHGT-16)
The transition to net-zero emissions requires large amounts of carbon dioxide to be captured and stored permanently in geological storage. To initiate the large-scale deployment of CO2 capture, transport, and storage (CCTS) value chains, immediate deployment of infrastructure is required. The environmental impacts of a value chain relying on ready-to-use technologies instead of optimal ones with long lead times, such as pipelines, is so far unclear. We assess the environmental impacts through the life cycle assessment of an exemplary CCTS value chain from Switzerland to Norway that only uses immediately available technologies. Even though the system relies on suboptimal technologies and is not optimized for a low climate impact, it shows the capability to effectively sequester CO2 without emitting more during its life cycle than is stored. Contrary to previous studies, the ready-to-use transport modes cause a significant share (56.3 %) of the total global warming impact (GWI) of the value chain. More than 73 % of the total GWI stems from the use of fossil fuels during the operation phase of the value chain.
Water, ethanol, or methanol for adsorption chillers? Model-based performance prediction from Infrared–Large-Temperature-Jump experiments
Henninger, Matthias; Engelpracht, Mirko; Tuchlinski, Daniel; et al. (2024)
Applied Thermal Engineering
Adsorption chillers are a promising technology to ease the burden on renewable electricity demand by using waste heat as driving energy. Their performance depends on the adsorbent's kinetics, the chosen refrigerant, the design of the adsorber, and the selected temperatures. Thus, quantifying an adsorption chillers’ performance usually requires expensive experiments at full scale. Here, we efficiently characterize a broad set of working pairs for a wide range of conditions using a two-step approach: First, we conducted Large-Temperature-Jump and equilibrium experiments to extract kinetic and equilibrium parameters of water, ethanol, and methanol with a set of currently discussed adsorbents. Second, we inserted the parameters into a dynamic Modelica model to evaluate the working pairs’ performance in full-scale two-bed adsorption chillers. For chilling above 0 °C, water remains the benchmark refrigerant with the highest volumetric power and efficiency with the silica gels SG123 and Siogel. Ethanol and methanol working pairs offer higher mass transfer coefficients, but could not offset the benefits of water. Coatings of the MOFs aluminum fumarate and CAU–10–H provided exceptionally high heat transfer coefficients, but were too thin to compete. For chilling below 0 °C, ethanol and methanol were on par. ZIF–8 was competitive with the activated carbon CarboTech A35. Overall, CarboTech A35/methanol showed broad applicability, performing comparably to SG123/water above 0 °C while still providing reasonable performance below 0 °C.
Capillary-assisted evaporation of water from finned tubes: Impacts of experimental setups and dynamics
Seiler, Jan; Volmer, Rahel; Krakau, Dennis; et al. (2020)
Applied Thermal Engineering
Capillary-assisted thin-film evaporation is a promising approach to overcome the heat transfer challenges associated with sub-atmospheric evaporation of water in refrigeration applications. Consequently, thin-film evaporation is currently studied in several labs. However, so far it has been unclear whether results from different labs can be compared. In this work, we therefore investigate – for the first time – the impact of experimental setups and procedures on sub-atmospheric capillary-assisted thin-film evaporation of the refrigerant water and deduce methodological recommendations for improving reliability and comparability of measurement results. We present results of evaporation from finned copper tubes with decreasing filling levels from two different experimental setups: At higher driving force, the resulting dynamics of logarithmic mean temperature differences, heat flows and overall heat transfer coefficients determined in both setups are generally in good agreement but absolute values show deviations of up to 24%. For lower driving forces, the results are identical within uncertainty of measurement. We conclude that the impact of experimental setup is important when comparing absolute values from different setups, but obtaining comparable results is generally possible. Furthermore, we compare experiments with continuously decreasing versus constant filling levels and show that both procedures yield the same results within measurement uncertainty. With decreasing filling level, however, overall heat transfer coefficients are systematically 5–10% higher. Thus, experiments with continuously decreasing filling level are well-suited for a fast analysis of all filling levels in a single experiment. © 2019 Elsevier Ltd.
Prospective life cycle assessment of CO2 transport for carbon dioxide removal
Nöhl, Julian; Burger, Johannes; Oeuvray, Pauline; et al. (2024)
Wasser und Ethanol als Kältemittelgemisch: Ein neuer Zugang zu Adsorptionskältemaschinen unter 0°C
Entrup, Marten; Seiler, Jan; Flake, Carsten; et al. (2019)
Thermodynamik-Kolloquium 2019. Book of Abstracts
Adsorptionsgestützte Kühlung unter 0°C mit Ethylenglykol-Wasser Gemischen
Seiler, Jan; Hackmann, Jonas; Lanzerath, Franz; et al. (2015)
Benchmarking metal-organic framework coatings from Large-Temperature-Jump experiments: Learning from trade-offs in mean powers versus characteristic times
Henninger, Matthias; Gilges, Markus; Nissen, Tim; et al. (2023)
Applied Thermal Engineering
Adsorption chillers can substitute the electric energy demand of conventional compression chillers with low-temperature heat. The efficiency and power density of adsorption chillers depend on their adsorbent and refrigerant, which form the working pair. Novel working pairs are therefore actively developed and characterized in dynamic small-scale experiments using a characteristic time constant. However, this evaluation by only few characteristic time constants, does not resolve the trade-off between efficiency and power density of adsorption chillers and novel materials are challenging to compare due to varying size, shape, and density. To fill these gaps, we investigate the trade-off between efficiency and power density by quantifying all characteristic time constants and transferring them to specific mean powers. We perform Large-Temperature-Jump experiments with water as the refrigerant on the two metal–organic frameworks CAU–10–H and aluminum fumarate for a chilling/recooling/regeneration temperature triple of 10/30/80 °C. We compare the metal–organic frameworks’ specific mean powers to the commercially available RD type silica gels Siogel and SG123. Siogel performed best in terms of area-specific mean powers with a maximum value of 3.2 kW/m². For low time constants up to 20 % relative loading, corresponding to high power density but lower efficiency, Siogel also provided the highest volume-specific mean power at 8.1 MW/m³. CAU–10–H had the highest mass- and volume-specific mean powers at 19.0–19.9 kW/kg and 7.2–8.6 MW/m3 for characteristic time constants of 35 % relative loading and higher. Aluminum fumarate and SG123 showed low specific mean powers for all chosen characteristic time constants. The results show that studying specific mean powers is a useful tool to benchmark adsorption working pairs as they would perform in an adsorption chiller, regardless of mass, shape, or density.
Heat and Mass Transfer Kinetics of MOF-Coatings from Alfumarate and CAU-10(Al)-H from IR-LTJ experiments: The Impact of Characteristic Times
Henninger, Matthias Roland Wolfgang; Gilges, Markus; Rustam, Lina; et al. (2021)
The metal-organic frameworks (MOFs) Al-fumarate and aluminum-isophthalate CAU-10 (CAU = Christian Albrechts University Kiel) are considered for water-based adsorption chillers because of their excellent cyclic stability and high water uptake. However, water uptake captures only the equilibrium behavior, while process performance depends strongly on kinetics. In this work, we, therefore, determine characteristic time constants for water ad- and desorption on Al-fumarate and CAU-10. The MOF coatings are studied by small-scale Infrared Large-Temperature-Jump (IR-LTJ) experiments. Commercially available granular silica gels serve as benchmark. We show that the performance expected from the characteristic time constants depends strongly on the chosen characteristic time as well as the chosen reference in the heat exchanger: For area-specific mean power, silica gel performs best for small time constants, CAU-10 and silica gel both perform best for intermediate time constants, and Al-fumarate performs best for large time constants for the temperature triple 10/30/80 °C. For volume-specific mean powers, silica gels are outperformed by both MOF-coatings with the best results for CAU-10 at intermediate time constants. The results highlight the potential of MOF coatings for adsorption chillers

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Jan Seiler

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