@misc{46753, abstract = {{Die Energieaufnahme von Haushaltskältegeräten ist seit den 1990er Jahren erheblich gesunken. Dieser Wert wird von den Herstellern im Neuzustand der Geräte unter Normbedingungen bestimmt. Wie jedes technische System unterliegen jedoch auch Haushaltskältegeräte einem Alterungsprozess, der zu einem Anstieg der Energieaufnahme über die Zeit führt. Im Rahmen dieser Dissertation wurde auf der Grundlage von 100 Messungen der Energieaufnahme, die an 32 Geräten über einen Zeitraum von 21 Jahren durchgeführt wurden, ein Alterungsmodell entwickelt. Dieses Modell ist das erste, das mit Hilfe von Daten der Energieaufnahme real gealterter Geräte entwickelt wurde. Es beschreibt einen Anstieg der Energieaufnahme von 27 % über die durchschnittliche Einsatzzeit eines Haushaltskältegeräts von 16 Jahren. Der stärkste Anstieg erfolgt in den ersten fünf Betriebsjahren. Durch Diffusionsvorgänge in dem im Gehäuse verbauten Polyurethan-Schaum wird das im Zellgas vorhandene Kohlenstoffdioxid durch Luft ersetzt. Hierdurch steigt die Wärmeleitfähigkeit des Schaums um ca. 33 % an, wodurch sich die Energieaufnahme der Geräte erhöht. Des Weiteren wurde der Einsatz von Paraffinen als Phasenwechselmaterial in Haushaltskältegeräten untersucht. Durch deren Einsatz konnte die Energieaufnahme gesenkt und die Funktionalität der Geräte gesteigert werden. Hierfür sind detaillierte Kenntnisse der Materialkenndaten der Paraffine notwendig. Die Wärmeleitfähigkeit der verschiedenen Paraffin-Stoffgruppen in der festen Phase ist jedoch bisher nur unzureichend untersucht worden. Daher wurde ein Messaufbau entwickelt, mit dem die Wärmeleitfähigkeit von festem Paraffin bestimmt werden kann, und es wurden entsprechende Messungen durchgeführt.}}, author = {{Paul, Andreas}}, publisher = {{LibreCat University}}, title = {{{Analyse von Alterungsmechanismen im Hinblick auf die Effizienz von Haushaltskältegeräten}}}, doi = {{10.17619/UNIPB/1-1784}}, year = {{2023}}, } @article{29208, abstract = {{The parameters required to calculate the energy efficiency of household refrigerating appliances (i.e. refrigerators, freezers and their combinations) are determined by standard measurements. According to regulations, these measurements are carried out when the appliances are new. It is known from previous studies that various technical aging mechanisms can increase electrical energy consumption by up to 36 % over a product lifespan of 18 years. In order to determine the time dependence of the energy consumption of household refrigerating appliances, repeated measurements are carried out in this work. Eleven new appliances are examined under standard measurement conditions. After just two years of operation, an additional energy consumption of up to 11 % is determined. Furthermore, 21 older appliances that had previously been measured in new condition are tested again after up to 21 years of operation. For these older appliances, an average increase of energy consumption of 28 % is found. For individual appliances, the maximum increase is 36 %. An aging model is developed on the basis of these measurement results, which may help to predict the aging-related increase of energy consumption of household refrigerating appliances. This model shows an average increase in energy consumption of 27 % for an appliance age of 16 years. Supplemental performance tests of eight compressors do not show any significant aging effects related to these devices after two years of operation. Furthermore, measurements of the thermal conductivity of aged polyurethane foam test samples are carried out and an increase of its thermal conductivity of 26 % over a period of about three years is determined.}}, author = {{Paul, Andreas and Baumhögger, Elmar and Elsner, Andreas and Reineke, Michael and Hueppe, Christian and Stamminger, Rainer and Hoelscher, Heike and Wagner, Hendrik and Gries, Ulrich and Becker, Wolfgang and Vrabec, Jadran}}, issn = {{1359-4311}}, journal = {{Applied Thermal Engineering}}, keywords = {{Industrial and Manufacturing Engineering, Energy Engineering and Power Technology}}, publisher = {{Elsevier BV}}, title = {{{Impact of aging on the energy efficiency of household refrigerating appliances}}}, doi = {{10.1016/j.applthermaleng.2021.117992}}, volume = {{205}}, year = {{2022}}, } @article{33255, author = {{Betken, Benjamin and Beckmüller, Robin and Ali Javed, Muhammad and Baumhögger, Elmar and Span, Roland and Vrabec, Jadran and Thol, Monika}}, issn = {{0021-9614}}, journal = {{The Journal of Chemical Thermodynamics}}, keywords = {{Physical and Theoretical Chemistry, General Materials Science, Atomic and Molecular Physics, and Optics}}, publisher = {{Elsevier BV}}, title = {{{Thermodynamic Properties for 1-Hexene – Measurements and Modeling}}}, doi = {{10.1016/j.jct.2022.106881}}, year = {{2022}}, } @article{20925, author = {{Abbas, Wameedh Khider Abbas and Linnemann, Matthias and Baumhögger, Elmar and Vrabec, Jadran}}, issn = {{0196-8904}}, journal = {{Energy Conversion and Management}}, title = {{{Experimental study of two cascaded organic Rankine cycles with varying working fluids}}}, doi = {{10.1016/j.enconman.2020.113818}}, year = {{2021}}, } @article{29168, abstract = {{AbstractThe homogeneous density of the liquid phase is experimentally investigated for methyl diethanolamine. Data are obtained along five isotherms in a temperature range between 300 K and 360 K for pressures up to 95 MPa. Two different apparatuses are used to measure the speed of sound for the temperatures between 322 K and 450 K with a maximum pressure of 95 MPa. These measurements and literature data are used to develop a fundamental equation of state for methyl diethanolamine. The model is formulated in terms of the Helmholtz energy and allows for the calculation of all thermodynamic properties in gaseous, liquid, supercritical, and saturation states. The experimental data are represented within their uncertainties. The physical and extrapolation behavior is validated qualitatively to ensure reasonable calculations outside of the range of validity. Based on the experimental datasets, the equation of state is valid for temperatures from 250 K to 750 K and pressures up to 100 MPa.}}, author = {{Neumann, Tobias and Baumhögger, Elmar and Span, Roland and Vrabec, Jadran and Thol, Monika}}, issn = {{0195-928X}}, journal = {{International Journal of Thermophysics}}, keywords = {{Condensed Matter Physics}}, number = {{1}}, publisher = {{Springer Science and Business Media LLC}}, title = {{{Thermodynamic Properties of Methyl Diethanolamine}}}, doi = {{10.1007/s10765-021-02933-7}}, volume = {{43}}, year = {{2021}}, } @article{22925, author = {{Claes, Leander and Chatwell, René Spencer and Baumhögger, Elmar and Hetkämper, Tim and Zeipert, Henning and Vrabec, Jadran and Henning, Bernd}}, issn = {{0263-2241}}, journal = {{Measurement}}, title = {{{Measurement procedure for acoustic absorption and bulk viscosity of liquids}}}, doi = {{10.1016/j.measurement.2021.109919}}, year = {{2021}}, } @phdthesis{42141, author = {{Sonnenrein, Gerrit}}, title = {{{Effizienzsteigerung von Haushaltskühlgeräten durch polymergebundene Phasenwechselmaterialien}}}, year = {{2021}}, } @article{20921, abstract = {{The increase of the thermal conductivity of PUR foam in the insulation of the cabinet is an important cause for aging processes of household refrigerating appliances. To determine the influence of the PUR foam aging on energy consumption, the development of a new measurement method is necessary be- cause current methods influence the aging behavior of household refrigerators and are therefore not applicable in general. Based on a latent heat sink, constructed as an ice water bucket, a new measure- ment method is developed to determine the k ·A value over time. With this method, the k ·A value of four household refrigerating appliances was determined over an interval of 14 months. The k ·A value increased between 3.6% and 11.5% during this period.}}, author = {{Paul, Andreas and Baumhögger, Elmar and Elsner, Andreas and Moczarski, Lukas and Reineke, Michael and Sonnenrein, Gerrit and Hueppe, Christian and Stamminger, Rainer and Hoelscher, Heike and Wagner, Hendrik and Gries, Ulrich and Freiberger, Alfred and Becker, Wolfgang and Vrabec, Jadran}}, issn = {{0140-7007}}, journal = {{International Journal of Refrigeration}}, pages = {{235--242}}, title = {{{Determining the heat flow through the cabinet walls of household refrigerating appliances}}}, doi = {{10.1016/j.ijrefrig.2020.10.007}}, year = {{2021}}, } @article{17589, author = {{Sonnenrein, G. and Baumhögger, Elmar and Elsner, A. and Morbach, A. and Neukötter, M. and Paul, A. and Vrabec, J.}}, issn = {{0140-7007}}, journal = {{International Journal of Refrigeration}}, title = {{{Improving the performance of household refrigerating appliances through the integration of phase change materials in the context of the new global refrigerator standard IEC 62552:2015}}}, doi = {{10.1016/j.ijrefrig.2020.07.025}}, year = {{2020}}, } @article{16848, author = {{Javed, Muhammad Ali and Rüther, Moritz and Baumhögger, Elmar and Vrabec, Jadran}}, issn = {{0021-9568}}, journal = {{Journal of Chemical & Engineering Data}}, title = {{{Density and Thermodynamic Speed of Sound of Liquid Vinyl Chloride}}}, doi = {{10.1021/acs.jced.9b01133}}, year = {{2020}}, } @inproceedings{15490, author = {{Claes, Leander and Baumhögger, Elmar and Rüther, Torben and Gierse, Jan and Tröster, Thomas and Henning, Bernd}}, booktitle = {{Fortschritte der Akustik - DAGA 2020}}, pages = {{1077--1080}}, title = {{{Reduction of systematic measurement deviation in acoustic absorption measurement systems}}}, year = {{2020}}, } @article{21514, abstract = {{The influence of latent heat storage elements on the cooling performance and the temperature rise time of household refrigerating appliances is studied experimentally in the context of the “new global refriger- ator standard”IEC 62552:2015. In addition to the daily energy consumption, this international standard- ization introduced performance tests for cooling capacity and temperature rise time. While the cooling capacity has long been anchored in various test procedures of consumer organizations, the temperature rise time, which has only been tested on freezers so far, will be a decisive factor in the future. Moreover, the need for so-called "smart appliances" that may balance power consumption is increasing since such devices may compensate the volatility of renewable energies and thus stabilize the power grid. Against this background, eight commercial household refrigerators and refrigerator-freezers are equipped with polymer-bound phase change materials (PCM) and their performance is determined under the new stan- dard test conditions. The results show that the introduction of PCM increases the cooling capacity by up to 33 % and also increases the temperature rise time by up to 145 %, without affecting power consump- tion, as compared to the unmodified refrigeration appliances.}}, author = {{Sonnenrein, Gerrit and Baumhögger, Elmar and Elsner, Andreas and Morbach, A. and Neukötter, Moritz and Paul, Andreas and Vrabec, J.}}, issn = {{0140-7007}}, journal = {{International Journal of Refrigeration}}, pages = {{448--456}}, publisher = {{Elsevier}}, title = {{{Improving the performance of household refrigerating appliances through the integration of phase change materials in the context of the new global refrigerator standard IEC 62552:2015}}}, doi = {{10.1016/j.ijrefrig.2020.07.025}}, volume = {{119}}, year = {{2020}}, } @article{21512, abstract = {{Despite the omnipresence of household refrigeration appliances, there is still a lack of knowledge about their agerelated efficiency loss over time. Past studies provide basic evidence for increasing electricity consumption of cooling appliances with ageing but fail to investigate the associated technical wear. Concentrating on the degradation of the thermal insulation, we first determined the ageing process of sealed samples of polyurethane rigid foam by investigating changes in cell gas composition and thermal conductivity over time. Simultaneously, the main challenge was to develop an approach that investigates the age-related efficiency loss of the insulation without its destruction. This testing procedure is referred to as the Bonn method. The non-destructive Bonn method was applied to varying refrigerator models in a series of successive experiments to evaluate the insulation degradation over time. Subsequently, the physical relationship between the test value of the Bonn method and the heat transfer through the multi-layered compartment walls of domestic refrigeration appliances was established, ultimately characterising the degrading insulation in terms of increasing heat transfer. Our results give substantiated evidence that the efficiency loss of cooling appliances is greatly influenced by insulation degradation over time. The ageing of sealed samples of polyurethane rigid foam indicates a large initial increase of thermal conductivity by 15% within the first year, corresponding to a change in cell gas composition. These results are in line with those of the Bonn method, emphasising an increasing heat flow through the multi-layered compartment walls of domestic refrigerators with ageing. Therewith, the present study is of significance to a wide range of stakeholders and forms the basis for future research.}}, author = {{Hueppe, Christian and Geppert, Jasmin and Stamminger, Rainer and Wagner, Hendrik and Hoelscher, Heike and Vrabec, Jadran and Paul, Andreas and Elsner, Andreas and Becker, Wolfgang and Gries, Ulrich and Freiberger, Alfred}}, issn = {{1359-4311}}, journal = {{Applied Thermal Engineering}}, publisher = {{Elsevier}}, title = {{{Age-related efficiency loss of household refrigeration appliances: Development of an approach to measure the degradation of insulation properties}}}, doi = {{10.1016/j.applthermaleng.2020.115113}}, volume = {{173}}, year = {{2020}}, } @inproceedings{15247, author = {{Grabo, Matti and Weber, Daniel and Paul, Andreas and Klaus, Tobias and Bermpohl, Wolfgang and Krauter, Stefan and Kenig, Eugeny}}, location = {{Nordhausen}}, title = {{{Entwicklung eines thermischen 1D-Simulationsmodells zur Bestimmung der Temperaturverteilung in Solarmodulen}}}, year = {{2019}}, } @inproceedings{15248, author = {{Grabo, Matti and Weber, Daniel and Paul, Andreas and Klaus, Tobias and Bermpohl, Wolfgang and Kenig, Eugeny}}, location = {{Frankfurt am Main}}, title = {{{Numerische Untersuchung der Temperaturverteilung in PCM-integrierten Solarmodulen}}}, year = {{2019}}, } @inproceedings{16271, author = {{Claes, Leander and Johannesmann, Sarah and Baumhögger, Elmar and Henning, Bernd}}, booktitle = {{2019 International Congress on Ultrasonics}}, title = {{{Quantification of frequency-dependent absorption phenomena}}}, doi = {{10.1121/2.0001043}}, year = {{2019}}, } @article{16305, author = {{Linnemann, Matthias and Nikolaychuk, Pavel Anatolyevich and Muñoz-Muñoz, Y. Mauricio and Baumhögger, Elmar and Vrabec, Jadran}}, issn = {{0021-9568}}, journal = {{Journal of Chemical & Engineering Data}}, pages = {{1180--1188}}, title = {{{Henry’s Law Constant of Noble Gases in Water, Methanol, Ethanol, and Isopropanol by Experiment and Molecular Simulation}}}, doi = {{10.1021/acs.jced.9b00565}}, year = {{2019}}, } @article{13158, author = {{Thol, Monika and Javed, Muhammad Ali and Baumhögger, Elmar and Span, Roland and Vrabec, Jadran}}, issn = {{0888-5885}}, journal = {{Industrial & Engineering Chemistry Research}}, pages = {{9617--9635}}, title = {{{Thermodynamic Properties of Dodecamethylpentasiloxane, Tetradecamethylhexasiloxane, and Decamethylcyclopentasiloxane}}}, doi = {{10.1021/acs.iecr.9b00608}}, year = {{2019}}, } @article{13159, author = {{Javed, Muhammad Ali and Baumhögger, Elmar and Vrabec, Jadran}}, issn = {{0021-9568}}, journal = {{Journal of Chemical & Engineering Data}}, pages = {{1035--1044}}, title = {{{Thermodynamic Speed of Sound Data for Liquid and Supercritical Alcohols}}}, doi = {{10.1021/acs.jced.8b00938}}, year = {{2019}}, } @article{13189, author = {{Javed, Muhammad Ali and Baumhögger, Elmar and Vrabec, Jadran}}, issn = {{0021-9614}}, journal = {{The Journal of Chemical Thermodynamics}}, title = {{{Thermodynamic speed of sound of xenon}}}, doi = {{10.1016/j.jct.2019.105933}}, year = {{2019}}, } @article{21519, author = {{Grabo, Matti and Weber, Daniel and Paul, Andreas and Klaus, Tobias and Bermpohl, Wolfgang and Krauter, Stefan and Kenig, Eugeny}}, isbn = {{978-88-95608-73-0}}, journal = {{CHEMICAL ENGINEERING TRANSACTIONS}}, pages = {{895--900}}, publisher = {{AIDIC The Italian Association of Chemical Engineering}}, title = {{{Numerical Investigation of the Temperature Distribution in PCM-integrated Solar Modules}}}, doi = {{10.3303/CET1976150}}, volume = {{76}}, year = {{2019}}, } @inproceedings{21521, author = {{Grabo, Matti and Weber, Daniel and Paul, Andreas and Klaus, Tobias and Bermpohl, Wolfgang and Kenig, Eugeny}}, location = {{Frankfurt am Main}}, title = {{{Numerische Untersuchung der Temperaturverteilung in PCM-integrierten Solarmodulen}}}, year = {{2019}}, } @inproceedings{21520, author = {{Grabo, Matti and Weber, Daniel and Paul, Andreas and Klaus, Tobias and Bermpohl, Wolfgang and Krauter, Stefan and Kenig, Eugeny}}, location = {{Nordhausen}}, title = {{{Entwicklung eines thermischen 1D-Simulationsmodells zur Bestimmung der Temperaturverteilung in Solarmodulen}}}, year = {{2019}}, } @inproceedings{21518, abstract = {{Wie jedes technische System unterliegen auch Haushaltskältegeräte einer alterungsbedingten Degeneration, die zu einem Anstieg der Energieaufnahme über die Lebensdauer dieser Geräte führt. Ursache hierfür sind verschiedene Effekte, die in dem vom BMWi geförderten Projekt ALGE untersucht werden. Aus den so gewonnenen Erkenntnissen sollen dann degenerationsbeständigere Haushaltskältegeräte entwickelt werden. Eine wichtige Alterungsursache ist der Anstieg der Wärmeleitfähigkeit des PUR-Schaums der Gehäuseisolierung. Zur Bestimmung dieses Einflusses auf die Energieaufnahme ist die Entwicklung neuer Messmethoden notwendig, die zerstörungsfrei sein und den realen Anwendungsbedingungen möglichst nahekommen sollen. Dazu wurde eine Wärmesenke entwickelt, die den Geräteinnenraum unabhängig vom Kältekreislauf abkühlt. Die Wärmesenke ist als Eiswasserbehälter ausgeführt, sodass die Schmelzenthalpie des Eises die durch die Isolierung in den Geräteinnenraum einfallende Wärme aufnimmt. Durch die Bestimmung der Abtauzeit einer bestimmten Eismenge kann so der alterungsbeeinflusste 𝑘∙𝐴-Wert des Gehäuses von Haushaltskältegeräten bestimmt werden.}}, author = {{Paul, Andreas and Moczarski, Lukas and Gieselmann, Mirko and Reineke, Michael and Elsner, Andreas and Baumhögger, Elmar and Sonnenrein, Gerrit and Vrabec, Jadran}}, isbn = {{978-3-932715-52-5}}, location = {{Ulm}}, publisher = {{Deutscher Kälte- und Klimatechnischer Verein e.V. }}, title = {{{Bestimmung von Wärmeverlusten in Haushaltskältegeräten}}}, year = {{2019}}, } @article{15250, author = {{Grabo, Matti and Weber, Daniel and Paul, Andreas and Klaus, Tobias and Bermpohl, Wolfgang and Krauter, Stefan and Kenig, Eugeny}}, issn = {{2283-9216}}, journal = {{Chemical Engineering Transactions}}, pages = {{895--900}}, title = {{{Numerical Investigation of the Temperature Distribution in PCM-integrated Solar Modules}}}, doi = {{10.3303/CET1976150}}, year = {{2019}}, } @article{13160, author = {{Thol, Monika and Dubberke, Frithjof H. and Baumhögger, Elmar and Span, Roland and Vrabec, Jadran}}, issn = {{0021-9568}}, journal = {{Journal of Chemical & Engineering Data}}, pages = {{2533--2547}}, title = {{{Speed of Sound Measurements and a Fundamental Equation of State for Hydrogen Chloride}}}, doi = {{10.1021/acs.jced.7b01031}}, year = {{2018}}, } @article{13163, author = {{Thol, Monika and Dubberke, Frithjof H. and Baumhögger, Elmar and Span, Roland and Vrabec, Jadran}}, issn = {{0021-9568}}, journal = {{Journal of Chemical & Engineering Data}}, pages = {{2533--2547}}, title = {{{Speed of Sound Measurements and a Fundamental Equation of State for Hydrogen Chloride}}}, doi = {{10.1021/acs.jced.7b01031}}, year = {{2018}}, } @misc{42162, author = {{Rutkai, Gábor}}, title = {{{Large Scale Thermodynamic Data Generation with Molecular Simulation}}}, year = {{2018}}, } @inproceedings{6556, author = {{Claes, Leander and Chatwell, René Spencer and Vrabec, Jadran and Henning, Bernd}}, booktitle = {{PROCEEDINGS -- AMA Conferences 2017}}, isbn = {{978-3-9816876-4-4}}, pages = {{304--309}}, publisher = {{AMA Service GmbH}}, title = {{{A Spectral Approach to Acoustic Absorption Measurement}}}, doi = {{10.5162/sensor2017/C1.2}}, year = {{2017}}, } @article{13161, author = {{Dubberke, Frithjof H. and Linnemann, Matthias and Abbas, Wameedh Khider and Baumhögger, Elmar and Priebe, Klaus-Peter and Roedder, Maximilian and Neef, Matthias and Vrabec, Jadran}}, issn = {{1359-4311}}, journal = {{Applied Thermal Engineering}}, pages = {{958--964}}, title = {{{Experimental setup of a cascaded two-stage organic Rankine cycle}}}, doi = {{10.1016/j.applthermaleng.2017.11.137}}, year = {{2017}}, } @article{13162, author = {{Nikolaychuk, Pavel Anatolyevich and Linnemann, Matthias and Muñoz-Muñoz, Y. Mauricio and Baumhögger, Elmar and Vrabec, Jadran}}, issn = {{0366-7022}}, journal = {{Chemistry Letters}}, pages = {{990--991}}, title = {{{Experimental and Computational Study on the Solubility of Argon in Propan-2-ol at High Temperatures}}}, doi = {{10.1246/cl.170221}}, year = {{2017}}, } @phdthesis{42138, author = {{Dubberke, Frithjof}}, title = {{{Thermophysical properties from experimental speed of sound measurements for working fluids in organic Rankine cycles}}}, year = {{2017}}, } @phdthesis{42139, author = {{Köster, Andreas}}, title = {{{Molekulare Simulation als effizientes Werkzeug zur Bestimmung thermodynamischer Stoffdaten}}}, year = {{2017}}, } @phdthesis{33, abstract = {{Lightweight materials play an ever growing role in today's world. Saving on the mass of a machine will usually translate into a lower energy consumption. However, lightweight applications are prone to develop performance problems due to vibration induced by the operation of the machine. The Fraunhofer Institute for Manufacturing Technology and Advanced Materials in Dresden conducts research into the damping properties of composite materials. They are experimenting with hollow, particle filled spheres embedded in the lightweight material. Such a system is the technical motivation of this thesis. Ultimately, a numerical experiment to derive the coefficient of restitution is required. The simulation developed in this thesis is based on a discrete element method to track the individual particle and sphere trajectories. Based on a potential based approach for the particle interactions deployed in molecular dynamics, the behavior of the particles can be controlled effectively. The simulated volume is using reflecting boundaries and encloses the hollow sphere. In this work, a highly flexible memory structure was used with a linked cell approach to cope with the highly flexible mass of particles. This allows for a linear complexity of the method in regard to the particle number by reducing the computational overhead of the interaction computation. Multiple numerical experiments show the great effect the particles have on the damping behavior of the system.}}, author = {{Steinle, Tobias}}, title = {{{Modeling and simulation of metallic, particle-damped spheres for lightweight materials}}}, year = {{2016}}, } @article{6655, author = {{Japs, Ewald and Sonnenrein, Gerrit and Krauter, Stefan and Vrabec, Jadran}}, journal = {{Solar Energy}}, pages = {{51--59}}, publisher = {{Elsevier}}, title = {{{Experimental study of phase change materials for photovoltaic modules: Energy performance and economic yield for the EPEX spot market}}}, volume = {{140}}, year = {{2016}}, } @article{13164, author = {{Dubberke, Frithjof H. and Riepold, Markus and Baumhögger, Elmar and Vrabec, Jadran}}, issn = {{0021-9568}}, journal = {{Journal of Chemical & Engineering Data}}, pages = {{1632--1636}}, title = {{{Speed of Sound of Oxygen in Supercritical States up to 500 K and 100 MPa}}}, doi = {{10.1021/acs.jced.5b01007}}, year = {{2016}}, } @phdthesis{42137, author = {{Miroshnichenko, Svetlana}}, isbn = {{9783843928281}}, title = {{{Molecular modeling and simulation for industrial applications}}}, year = {{2016}}, } @article{13165, author = {{Sonnenrein, G. and Baumhögger, Elmar and Elsner, A. and Fieback, K. and Morbach, A. and Paul, A. and Vrabec, J.}}, issn = {{0140-7007}}, journal = {{International Journal of Refrigeration}}, pages = {{166--173}}, title = {{{Copolymer-bound phase change materials for household refrigerating appliances: experimental investigation of power consumption, temperature distribution and demand side management potential}}}, doi = {{10.1016/j.ijrefrig.2015.06.030}}, year = {{2015}}, } @article{13166, author = {{Dubberke, Frithjof H. and Baumhögger, Elmar and Vrabec, Jadran}}, issn = {{0034-6748}}, journal = {{Review of Scientific Instruments}}, title = {{{Burst design and signal processing for the speed of sound measurement of fluids with the pulse-echo technique}}}, doi = {{10.1063/1.4921478}}, year = {{2015}}, } @article{21516, abstract = {{This study presents the results of an experimental investigation of the influence of latent thermal heat storage elements on the power consumption as well as the temperature distribution of commercial household refrigerators.Two evaporator types and a standard wireand- tube condenser are equipped with copolymer-bound phase change materials (PCM) and the performance is determined under standard conditions. The results show that refrigerating appliances equipped with PCM can be optimized through modifications of the control strategy to achieve different targets: (a) Power consumption can be significantly reduced by increasing the evaporator and decreasing the condenser temperature. (b) Temperature fluctuations in the refrigerator’s fresh-food compartment during the cooling cycle can be reduced from 4 °C to 0.5 °C. (c) The cooling cycle duration can be tripled without compromising the fresh-food compartment conditions. The latter may help to meet the growing demand for balancing power consumption to stabilize the power grid, e.g. if the share of highly fluctuating, sustainable energy supply is large.}}, author = {{Sonnenrein, Gerrit and Baumhögger, Elmar and Elsner, Andreas and Fieback, K. and Morbach, A. and Paul, Andreas and Vrabec, J.}}, issn = {{0140-7007}}, journal = {{International Journal of Refrigeration}}, pages = {{166--173}}, title = {{{Copolymer-bound phase change materials for household refrigerating appliances: experimental investigation of power consumption, temperature distribution and demand side management potential}}}, doi = {{10.1016/j.ijrefrig.2015.06.030}}, volume = {{60}}, year = {{2015}}, } @inproceedings{1781, abstract = {{In light of an increasing awareness of environmental challenges, extensive research is underway to develop new light-weight materials. A problem arising with these materials is their increased response to vibration. This can be solved using a new composite material that contains embedded hollow spheres that are partially filled with particles. Progress on the adaptation of molecular dynamics towards a particle-based numerical simulation of this material is reported. This includes the treatment of specific boundary conditions and the adaption of the force computation. First results are presented that showcase the damping properties of such particle-filled spheres in a bouncing experiment.}}, author = {{Steinle, Tobias and Vrabec, Jadran and Walther, Andrea}}, booktitle = {{Proc. Modeling, Simulation and Optimization of Complex Processes (HPSC)}}, editor = {{Bock, Hans Georg and Hoang, Xuan Phu and Rannacher, Rolf and Schlöder, Johannes P.}}, isbn = {{978-3-319-09063-4}}, pages = {{233--243}}, publisher = {{Springer International Publishing}}, title = {{{Numerical Simulation of the Damping Behavior of Particle-Filled Hollow Spheres}}}, doi = {{10.1007/978-3-319-09063-4_19}}, year = {{2014}}, } @article{13167, author = {{Sonnenrein, G. and Elsner, A. and Baumhögger, Elmar and Morbach, A. and Fieback, K. and Vrabec, J.}}, issn = {{0140-7007}}, journal = {{International Journal of Refrigeration}}, pages = {{154--160}}, title = {{{Reducing the power consumption of household refrigerators through the integration of latent heat storage elements in wire-and-tube condensers}}}, doi = {{10.1016/j.ijrefrig.2014.12.011}}, year = {{2014}}, } @article{13168, author = {{Dubberke, Frithjof H. and Rasche, David B. and Baumhögger, Elmar and Vrabec, Jadran}}, issn = {{0034-6748}}, journal = {{Review of Scientific Instruments}}, title = {{{Apparatus for the measurement of the speed of sound of ammonia up to high temperatures and pressures}}}, doi = {{10.1063/1.4891795}}, year = {{2014}}, } @article{13169, author = {{Gorenflo, Dieter and Baumhögger, Elmar and Herres, Gerhard and Kotthoff, Stephan}}, issn = {{0140-7007}}, journal = {{International Journal of Refrigeration}}, pages = {{203--226}}, title = {{{Prediction methods for pool boiling heat transfer: A state-of-the-art review}}}, doi = {{10.1016/j.ijrefrig.2013.12.012}}, year = {{2014}}, } @phdthesis{42126, author = {{Kotthoff, Stephan}}, isbn = {{9783932715877}}, title = {{{Zum Einfluss von Fluid- und Heizflächeneigenschaften auf Wärmeübergang und Blasenbildung beim Sieden}}}, year = {{2014}}, } @phdthesis{42135, author = {{Windmann, Thorsten}}, title = {{{Vapor-liquid equilibrium properties from molecular simulation and experiment}}}, year = {{2014}}, } @inproceedings{21517, author = {{Elsner, Andreas and Müller, Michael and Paul, Andreas and Vrabec, Jadran}}, location = {{Hannover}}, publisher = {{Deutscher Kälte- und Klimatechnischer Verein e.V. }}, title = {{{Zunahme des Stromverbrauchs von Haushaltskältegeräten durch Alterung}}}, year = {{2013}}, } @article{13170, author = {{Gorenflo, Dieter and Baumhögger, Elmar and Windmann, Thorsten and Herres, Gerhard}}, issn = {{0140-7007}}, journal = {{International Journal of Refrigeration}}, pages = {{1251--1263}}, title = {{{Nucleate pool boiling, film boiling and single-phase free convection at pressures up to the critical state. Part II: Circumferential variation of the wall superheat for a horizontal 25mm copper cylinder}}}, doi = {{10.1016/j.ijrefrig.2010.08.004}}, year = {{2010}}, } @article{13171, author = {{Gorenflo, Dieter and Baumhögger, Elmar and Windmann, Thorsten and Herres, Gerhard}}, issn = {{0140-7007}}, journal = {{International Journal of Refrigeration}}, pages = {{1229--1250}}, title = {{{Nucleate pool boiling, film boiling and single-phase free convection at pressures up to the critical state. Part I: Integral heat transfer for horizontal copper cylinders}}}, doi = {{10.1016/j.ijrefrig.2010.07.015}}, year = {{2010}}, } @article{13172, author = {{Gedanitz, Holger and Dávila, María J. and Baumhögger, Elmar and Span, Roland}}, issn = {{0021-9614}}, journal = {{The Journal of Chemical Thermodynamics}}, pages = {{478--483}}, title = {{{An apparatus for the determination of speeds of sound in fluids}}}, doi = {{10.1016/j.jct.2009.11.002}}, year = {{2009}}, } @inproceedings{13173, author = {{Span, R. and Gerber, M. and Buljina, I. and Baumhögger, Elmar}}, booktitle = {{Boiling}}, isbn = {{1567002250}}, title = {{{POOL BOILING IN HIGHLY VISCOUS MIXTURES - DESIGN OF A NEW APPARATUS AND RESULTS OF PRETESTS}}}, doi = {{10.1615/ihtc13.p28.590}}, year = {{2007}}, } @article{13174, author = {{Luke, Andrea and Baumhögger, Elmar and Scheunemann, P.}}, issn = {{0276-1459}}, journal = {{Multiphase Science and Technology}}, title = {{{3-DIMENSIONAL DESCRIPTION OF THE MICROSTRUCTURE OF HEATED SURFACES IN NUCLEATE POOL BOILING}}}, doi = {{10.1615/multscientechn.v12.i3-4.20}}, year = {{2000}}, }