@unpublished{SulaimanSaberHasanetal.2025, author = {Sulaiman, Mohammed Abdulqader and Saber, Hindren Ali and Hasan, Hasan Fahmi and Benim, Ali Cemal}, title = {Latent Heat Cold Storage Integrated Direct Evaporative Cooler: A Neoteric Practical Design for Energy and Water Saving Potential with Thermal Comfort Improvement}, series = {Social Science Research Network (SSRN)}, journal = {Social Science Research Network (SSRN)}, publisher = {Elsevier}, doi = {10.2139/ssrn.5352056}, pages = {90}, year = {2025}, subject = {Klimaanlage}, language = {en} } @inproceedings{GonzalezRialDinardoPadillaetal.2024, author = {Gonz{\´a}lez Rial, Gabriel and Dinardo, Daniel and Padilla, Germ{\´a}n D. and Barrancos, Jos{\´e} and Hern{\´a}ndez, Pedro A. and P{\´e}rez, Nemesio M. and Weber, Konradin and Fischer, Christian and Amend, Detlef}, title = {Remake of the low cost carbon dioxide sensor of the carbon dioxide network deployed by INVOLCAN in the urban areas of Puerto Naos and La Bombilla, La Palma, Canary Islands}, series = {European Geosciences Union General Assembly 2024, Vienna, Austria, 14-19 Apr 2024}, booktitle = {European Geosciences Union General Assembly 2024, Vienna, Austria, 14-19 Apr 2024}, number = {EGU24-19641}, publisher = {Copernicus}, doi = {10.5194/egusphere-egu24-19641}, year = {2024}, abstract = {An anomalous CO2 degassing appeared by the end of Tajogaite eruption (North-West flank of Cumbre Vieja volcano ridge, La Palma, Canary Islands), in the neighborhoods of La Bombilla and Puerto Naos at about 6 km distance from the volcanic vent. The areas affected by the anomalous CO2 degassing were not directly affected by lava flows during the eruptive period. After the eruption, and due to this strong volcanic-hydrothermal carbon dioxide emissions (CO2 5-20\%) were included in the exclusion zone. CO2 is an invisible toxic gas, as well as asphyxiating, and may be lethal when is present in concentrations higher than 14\%. During the post-eruptive period, INVOLCAN deployed its own indoor and outdoor CO2 monitoring networks in collaboration with other institutions, with the aim of delimitating the anomalous CO2 degassing areas, paying attention to those areas where CO2 air concentration exceeds hazardous thresholds. The number of monitoring stations were increasing to cover most of the homes, garages, basements, and local businesses. The first monitoring network were based on a LILYGO; TTGO T-SIM7000G electroniccard, previously programmed with an unstable algorithm that caused problems during the measurements. After some implementations to enhance the stability of the sensor, a new algorithm was developed that consists of the acquisition of ambient values every 5 seconds, applying a Moving Average Filter in every measurement to avoid outliers. The SIM card integrated in the hardware allows the data transmission to an MQTT broker where the values are published every 5 minutes, recollecting them in a unique Raspberry Pi 4 Model B located at the INVOLCAN headquarters, that reads and stores the data in two databases (InfluxDB and Google Sheets). The visualization of the values are done through Grafana Cloud, recollecting the data from InfluxDB and showing them distributed as tables and a geographic map that illustrates the concentration in the measurement points. The difference between this and the last storing is the flexibility when visualizing the data, that can be transformed to different kind of plots as mentioned. Moreover, an API for the management of each subsystem is created using PyQT, allowing to the user the calibration of the sensors in remote, as well as executing a soft reboot, or the integration of deeper parameters like the sensor mode (manual polling, streaming or command mode) or pressure data. Two of the 20 devices have been successfully installed and they are working correctly in La Palma, meanwhile an amount of 18 devices are being tested and recollecting properly with better stability in CO2 concentration measurements at our laboratory and will be installed indoor in different locations soon. The remaking of the algorithm allows to forget previous problems of wrong data and disconnections, obtaining accurate data compared to commercial sensors and helping the operator to configure and control the sensors without moving to conflicting locations.}, subject = {Vortrag}, language = {en} } @incollection{GottschaldReichAdam2018, author = {Gottschald, Jonas and Reich, Marius and Adam, Mario}, title = {Multikriterielle Auslegung der Energieversorgung eines Nahw{\"a}rmenetzes}, series = {RET.Con 2018. Tagungsband : 1. Regenerative Energietechnik-Konferenz in Nordhausen 8.-9. Februar 2018}, booktitle = {RET.Con 2018. Tagungsband : 1. Regenerative Energietechnik-Konferenz in Nordhausen 8.-9. Februar 2018}, editor = {Hochschule Nordhausen,}, publisher = {Hochschule Nordhausen}, address = {Nordhausen}, organization = {Hochschule Nordhausen}, doi = {10.22032/dbt.45831}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:27-dbt-20200904-111850-006}, pages = {141 -- 148}, year = {2018}, language = {de} } @inproceedings{DoerrMuenchAdam2024, author = {D{\"o}rr, Dominik and M{\"u}nch, Justin and Adam, Mario}, title = {Hochaufgel{\"o}ste Langzeitprognose des deutschen Strom-Importpotenzials mithilfe von Methoden des Maschinellen Lernens}, series = {RET.Con 2024. 7. Regenerative Energietechnik Konferenz in Nordhausen, 08.-09. Februar 2024. Tagungsband}, booktitle = {RET.Con 2024. 7. Regenerative Energietechnik Konferenz in Nordhausen, 08.-09. Februar 2024. Tagungsband}, editor = {Wesselak, Viktor}, address = {Nordhausen}, organization = {Hochschule Nordhausen}, isbn = {978-3-940820-23-5}, pages = {71 -- 78}, year = {2024}, language = {de} } @inproceedings{MuellerAdam2022, author = {M{\"u}ller, Benedikt and Adam, Mario}, title = {Multikriterielle Auslegung Deutschlands bislang gr{\"o}ßter solarthermischen Anlage zur Integration in ein Bestandsfernw{\"a}rmenetz}, series = {RET.Con 2022. - 5. Regenerative Energietechnik Konferenz, 10. - 11. Februar 2022, Nordhausen}, booktitle = {RET.Con 2022. - 5. Regenerative Energietechnik Konferenz, 10. - 11. Februar 2022, Nordhausen}, address = {Neuhausen}, organization = {HS Nordhausen}, year = {2022}, language = {de} } @inproceedings{KampannGoebelAdam2023, author = {Kampann, Maximilian and Goebel, Johannes and Adam, Mario}, title = {Effizienzuntersuchungen an einem W{\"a}rmepumpensystem mit Schichtspeicher f{\"u}r Raumheizung und Trinkwarmwasser anhand von Hardware-in-the-Loop Versuchen}, series = {RET.Con 2023. 6. Regenerative Energietechnik Konferenz in Nordhausen, 9.-10.2.2023}, booktitle = {RET.Con 2023. 6. Regenerative Energietechnik Konferenz in Nordhausen, 9.-10.2.2023}, editor = {Wesselak, Viktor}, publisher = {Nordhausen}, address = {Hochschule Nordhausen}, isbn = {978-3-940820-21-1}, pages = {176 -- 188}, year = {2023}, language = {de} } @inproceedings{MuenchReichAdam2020, author = {M{\"u}nch, Justin and Reich, Marius and Adam, Mario}, title = {Entwicklung eines Tools zur automatisierten Optimierung von Energiesystemen durch Maschinelles Lernen}, series = {RET.Con 2020. 3. Regenerative Energietechnik Konferenz, 13.-14.02.2020, Nordhausen}, booktitle = {RET.Con 2020. 3. Regenerative Energietechnik Konferenz, 13.-14.02.2020, Nordhausen}, editor = {Wesselak, Viktor}, publisher = {Hochschule Nordhausen}, address = {Nordhausen}, organization = {Hochschule Nordhausen}, isbn = {978-3-940820-16-7}, doi = {10.22032/dbt.46243}, pages = {152 -- 156}, year = {2020}, language = {de} } @article{BerkantOezelDurmazNurOezetal.2025, author = {Berkant {\"O}zel, Mehmet and Durmaz, Ufuk and Nur {\"O}z, Muhammed Ali and {\"U}mit Tepe, Ahmet and {\"O}z, Cemil and Uysal, {\"U}nal and Yal{\c{c}}inkaya, Orhan and Cemal Beni̇m, Ali and Alomayrah, Norah and Al-Buriahi, M.S.}, title = {Enhanced prediction of heat transfer in jet impingement cooling using an artificial intelligence: A case study}, series = {Case Studies in Thermal Engineering}, volume = {73}, journal = {Case Studies in Thermal Engineering}, publisher = {Elsevier}, issn = {2214-157X}, doi = {10.1016/j.csite.2025.106605}, url = {http://nbn-resolving.de/urn:nbn:de:hbz:due62-opus-55017}, pages = {11}, year = {2025}, abstract = {This paper is about the gas turbine cooling model using the extended jet array. The aim of the present study is to explain the effect of the impinging jet configuration of elongated jet holes on the heat transfer distribution with a deep Convolutional Neural Network (CNN). CNNs preserve spatial relationships through convolutional operations—unlike traditional Artificial Neural Networks (ANNs), which require flattening of input data—allowing for higher accuracy with smaller datasets and faster training due to fewer trainable parameters. The goal is to understand how accurate and fast deep learning models with limited data can deliver predictions for complex systems such as jet impingement cooling. The proposed CNN model was compared with the numerical and experimental data. Jet impingement cooling was examined with four different Reynolds numbers (16250, 21700, 27100, 36250) and six dimensionless gaps between the jet and the target surface (G/D = 1, 2, 3, 4, 5, and 6). Mean and local Nusselt number (Nu) distributions were investigated in particular. G/D = 2 was selected as the test data for the model among the configurations. While the CFD model failed to identify this peak performance point, the CNN model accurately captured this maximum behavior despite being trained only on other configurations. Moreover, the CNN model demonstrated more suitable prediction accuracy in the first two jet impingement regions than the CFD data, especially in capturing peak Nusselt numbers and localized hot spots. It has been determined that the CNN model provided more accurate predictions of the local Nusselt numbers within the measurement region compared to the Computational Fluid Dynamics (CFD) study for the average Nu, the proposed CNN model showed a closer agreement to experimental data than numerical simulation by 4.15 \% at the Re = 32500 and G/D = 2.}, subject = {Maschinelles Lernen}, language = {en} } @article{WeberFischerPohletal.2015, author = {Weber, Konradin and Fischer, Christian and Pohl, Tobias and B{\"o}hlke, Christoph and Lange, Martin and Scharifi, Emad and Eliasson, Jonas and Yoshitani, Junichi}, title = {The Application of Light Research Aircraft for the Investigation of Volcano Eruption Plumes, Industrial Emissions and Urban Plumes}, series = {WSEAS Transactions on Environment and Development}, volume = {11}, journal = {WSEAS Transactions on Environment and Development}, publisher = {WSEAS}, issn = {2224-3496}, url = {http://nbn-resolving.de/urn:nbn:de:hbz:due62-opus-50892}, pages = {89 -- 94}, year = {2015}, abstract = {Airborne measurements have proved to be an important tool for the investigation of volcanic emission plumes, industrial pollution plumes, fugitive emissions and urban pollution plumes. In this paper several examples are demonstrated, how these investigations can be performed by light and microlight propeller aircraft. Throughout the last years innovative aircraft were developed in the light and microlight class showing an excellent flight performance. This enables airborne measurements, which were performed in former years normally by big jet engine driven research aircraft. Moreover, these light and microlight aircraft are equipped with piston motors, which are sturdy enough to operate even in adverse and harsh flight conditions, e.g. in volcanic plumes with high ash concentration. Additionally, turbo charged versions of these airborne piston motors are available, which allow flight altitudes of 7000m - 9000m enabling a large variety of research missions. Another advantage of light and microlight research aircraft is that they are quite cost effective and have a comparatively short certification process for the installation of new measurement equipment. This made it possible to respond fast to the eruption of the Icelandic volcano Eyjafjallaj{\"o}kull 2010 and Grimsv{\"o}tn 2011 with research flights in volcanic ash plumes over Germany and Iceland. In this way it was possible to deliver real airborne measurements additional to the ash plume model calculations of the London Volcanic Ash Advisory Center (VAAC). In this paper examples of airborne measurements in the volcanic plumes of the recent eruptions of Icelandic volcanoes are given. Moreover examples are presented, which highlight the outstanding capabilities of these aircraft for pinpointing industrial emissions and for characterizing urban pollution plumes.}, subject = {Vulkanismus}, language = {en} } @article{PohlFischerHewelingetal.2017, author = {Pohl, Tobias and Fischer, Christian and Heweling, Georg and B{\"o}hlke, Christoph and Weber, Konradin}, title = {A Comparative Study as a Quality Assurance of Stationary and Portable Hand-Held Ultrafine Particle Monitors}, series = {WSEAS Transactions on Environment and Development}, volume = {13}, journal = {WSEAS Transactions on Environment and Development}, publisher = {WSEAS}, issn = {2224-3496}, url = {http://nbn-resolving.de/urn:nbn:de:hbz:due62-opus-50799}, pages = {6}, year = {2017}, abstract = {In this study we investigated the performance of two portable hand-held measurement devices (Testo DiSCMini, Grimm NanoCheck) under real environmental conditions at an area on the new campus of the University of Applied Sciences Duesseldorf, which was influenced by construction activities and traffic. The values were compared to the data from a freshly calibrated SMPS (Grimm SMPS+C) as a reference system. The SMPS measured the particle number concentration as well as the particle number size distribution in a range from 5 nm to 350 nm. This was done as a quality assurance for the use of these portable devices for other measurement campaigns for detecting the particle number concentration in mobile applications by e.g. unmanned aerial systems, bicycles, or small aircraft. The results show a good correlation between all the systems. The agreement between the reference system and the NanoCheck was really good, but lower between the DiSCMini and the reference system. Due to the good correlation the data could be post processed with a correction function to reduce the deviation. Finally, it can be stated, that both systems work well under environmental conditions and are well suited for the mobile use for the investigation of ultrafine particle concentration.}, subject = {Messtechnik}, language = {en} } @misc{OPUS4-5402, title = {Lebenswerte und umweltgerechte Stadtentwicklung: Kritische Positionen zum Green New Deal in urbanen R{\"a}umen}, volume = {Urban Studies}, editor = {Toscano, Beatriz V.}, publisher = {Bielefeld}, address = {transcript}, isbn = {9783839461860}, issn = {2747-3619}, doi = {10.14361/9783839461860}, url = {http://nbn-resolving.de/urn:nbn:de:hbz:due62-opus-54022}, pages = {240}, year = {2025}, abstract = {Nicht nur anderswo, sondern auch in deutschen St{\"a}dten gestaltet sich die soziale Lage in privilegierten Vierteln einerseits und Quartieren mit struktureller Benachteiligung andererseits extrem unterschiedlich. Bei der Suche nach Gegenmitteln wird immer deutlicher: Ein Engagement f{\"u}r soziale Gerechtigkeit muss auch Perspektiven der Umwelt- und Energieverteilungsgerechtigkeit beinhalten. Dazu bedarf es einer multiperspektivischen Betrachtung und einer interdisziplin{\"a}ren Zusammenarbeit. Die Beitr{\"a}ger*innen verhandeln diese Pr{\"a}missen und laden {\"u}ber wissenschaftliche Grenzen hinweg dazu ein, aus unterschiedlichen Blickwinkeln neue Zukunftsideen f{\"u}r eine sozial gerechte Stadt zu diskutieren.}, subject = {Stadtplanung}, language = {de} } @misc{EdenMolckWojciechowskietal.2025, author = {Eden, Jan and Molck, Thomas and Wojciechowski, Manfred and Albiez, Moritz and Schulze-F{\"o}cking, Mareike and Rother, Niklas and Fleischmann, Moritz and Schr{\"o}der, Kay and Uzunkol, Osmanbey and Ruess, Martin and Huldtgren, Alina and Balz, Andreas and Voigt, Christian and Grathwohl, Dirk and Mohren, Henning and Geick, Christiane and Russo, Kai and Kober, Sabine}, title = {Digitalstrategie der Hochschule D{\"u}sseldorf}, editor = {Vomberg, Edeltraud}, publisher = {Hochschule D{\"u}sseldorf}, address = {D{\"u}sseldorf}, doi = {10.20385/opus4-5682}, url = {http://nbn-resolving.de/urn:nbn:de:hbz:due62-opus-56828}, pages = {23}, year = {2025}, abstract = {Die digitale Transformation der Gesellschaft betrifft auch und in besonderem Maße Hochschulen, die Studierende auf eine digitale Gesellschaft vorbereiten, Digitalisierung zum Gegenstand von Forschung und Transfer machen und einen wesentlichen Beitrag zur kritischen Reflexion von Digitalit{\"a}t leisten. Vor diesem Hintergrund m{\"o}chte die Hochschule D{\"u}sseldorf (HSD) Chancen ergreifen, die sich f{\"u}r unsere Mitglieder und Angeh{\"o}rigen und f{\"u}r Hochschule als Organisation ergeben. Gleichzeitig will die HSD Risiken vermeiden, die aus einer undifferenzierten Adaption technischer M{\"o}glichkeiten folgen. Zu den Risiken geh{\"o}ren die sozialen, politischen und {\"o}kologischen Effekte des fl{\"a}chendeckenden Einsatzes von Technologie. Im Zuge der Entwicklung der Digitalstrategie haben sich Mitglieder und Angeh{\"o}rige der HSD aus allen Statusgruppen intensiv mit den Chancen und Risiken der Digitalisierung auseinandergesetzt, um einen Beitrag zur erfolgreichen Gestaltung der digitalen Transformation an der HSD zu leisten.}, subject = {Digitalisierung}, language = {de} }