Thematische Bibliographien / Polymeric hollow fibers heat exchanger

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Auswahl der wissenschaftlichen Literatur zum Thema „Polymeric hollow fibers heat exchanger“

Autor: Grafiati

Veröffentlicht am 28. Juni 2021

Zuletzt aktualisiert am 2. Februar 2022

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Zeitschriftenartikel zum Thema "Polymeric hollow fibers heat exchanger"

Astrouski, Ilya, Miroslav Raudensky, Tereza Kudelova und Tereza Kroulikova. „Fouling of Polymeric Hollow Fiber Heat Exchangers by Air Dust“. Materials 13, Nr. 21 (02.11.2020): 4931. http://dx.doi.org/10.3390/ma13214931.

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Currently, liquid-to-gas heat exchangers in buildings, domestic appliances and the automotive industry are mainly made of copper and aluminum. Using plastic instead of metal can be very beneficial from an economic and environmental point of view. However, it is required that a successful plastic design meets all the requirements of metal heat exchangers. The polymeric hollow fiber heat exchanger studied in this work is completive to common metal finned heat exchangers. Due to its unique design (the use of thousands of thin-walled microtubes connected in parallel), it achieves a high level of compactness and thermal performance, low pressure drops and high operation pressure. This paper focuses on an important aspect of heat exchanger operation—its fouling in conditions relevant to building and domestic application. In heating, ventilation and air conditioning (HVAC) and automotive and domestic appliances, outdoor and domestic dust are the main source of fouling. In this study, a heat exchanger made of polymeric hollow fibers was tested in conditions typical for indoor HVAC equipment, namely with the 20 °C room air flowing through the hot water coil (water inlet 50 °C) with air velocity of 1.5 m/s. ASHRAE test dust was used as a foulant to model domestic dust. A polymeric heat exchanger with fibers with an outer diameter of 0.6 mm (1960 fibers arranged into 14 layers in total) and a heat transfer area of 0.89 m2 was tested. It was proven that the smooth polypropylene surface of hollow fibers has a favorable antifouling characteristic. Fouling evolution on the metallic heat transfer surfaces of a similar surface density was about twice as quick as on the plastic one. The experimental results on the plastic heat exchanger showed a 38% decrease in the heat transfer rate and a 91% increase in pressure drops after eighteen days of the experiment when a total of 4000 g/m2 of the test dust had been injected into the air duct. The decrease in the heat transfer rate of the heat exchanger was influenced mainly by clogging in the frontal area because the first layers were fouled significantly more than the deeper layers.

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Kroulíková, Tereza, Tereza Kůdelová, Erik Bartuli, Jan Vančura und Ilya Astrouski. „Comparison of a Novel Polymeric Hollow Fiber Heat Exchanger and a Commercially Available Metal Automotive Radiator“. Polymers 13, Nr. 7 (06.04.2021): 1175. http://dx.doi.org/10.3390/polym13071175.

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A novel heat exchanger for automotive applications developed by the Heat Transfer and Fluid Flow Laboratory at the Brno University of Technology, Czech Republic, is compared with a conventional commercially available metal radiator. The heat transfer surface of this heat exchanger is composed of polymeric hollow fibers made from polyamide 612 by DuPont (Zytel LC6159). The cross-section of the polymeric radiator is identical to the aluminum radiator (louvered fins on flat tubes) in a Skoda Octavia and measures 720 × 480 mm. The goal of the study is to compare the functionality and performance parameters of both radiators based on the results of tests in a calibrated air wind tunnel. During testing, both heat exchangers were tested in conventional conditions used for car radiators with different air flow and coolant (50% ethylene glycol) rates. The polymeric hollow fiber heat exchanger demonstrated about 20% higher thermal performance for the same air flow. The efficiency of the polymeric radiator was in the range 80–93% and the efficiency of the aluminum radiator was in the range 64–84%. The polymeric radiator is 30% lighter than its conventional metal competitor. Both tested radiators had very similar pressure loss on the liquid side, but the polymeric radiator featured higher air pressure loss.

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Kůdelová, Tereza, Tereza Kroulíková, Ilya Astrouski und Miroslav Raudenský. „THE INFLUENCE OF THE FIBRES ARRANGEMENT ON HEAT TRANSFER AND PRESSURE DROP OF POLYMERIC HOLLOW FIBRE HEAT EXCHANGERS“. Acta Polytechnica 60, Nr. 2 (30.04.2020): 122–26. http://dx.doi.org/10.14311/ap.2020.60.0122.

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Polymeric hollow fibre heat exchangers are the new alternative to common metal heat exchangers. These heat exchangers provide advantages, such as low weight, corrosion resistance, easy shaping and machining. Moreover, they consume less energy during their production. Therefore, they are environmentally friendly. The paper deals with shell & tube heat exchangers, which consist of hundreds of polymeric hollow fibres. The structure of the heat transfer surfaces has a significant influence on the effectivity of the use of the heat transfer area that is formed by the polymeric hollow fibres. The study gives a comparison of heat exchangers with an identical outer volume. The difference between them is in the structure of the heat transfer insert. One of the presented heat exchangers has fibres that are in-line and the second heat exchanger has staggered fibres. The study also pays attention to the difference in differential pressures caused by the difference in the structure of the heat transfer surfaces.

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Krásný, Ivo, Ilya Astrouski und Miroslav Raudenský. „Polymeric hollow fiber heat exchanger as an automotive radiator“. Applied Thermal Engineering 108 (September 2016): 798–803. http://dx.doi.org/10.1016/j.applthermaleng.2016.07.181.

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Qin, Yuchun, Baoan Li und Shichang Wang. „Experimental Investigation of a Novel Polymeric Heat Exchanger Using Modified Polypropylene Hollow Fibers“. Industrial & Engineering Chemistry Research 51, Nr. 2 (04.01.2012): 882–90. http://dx.doi.org/10.1021/ie202075a.

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Kroulíková, Tereza, Ilya Astrouski und Miroslav Raudenský. „CHAOTISED POLYMERIC HOLLOW FIBRE BUNDLE AS A CROSSFLOW HEAT EXCHANGER IN AIR-WATER APPLICATION“. Acta Polytechnica 60, Nr. 4 (01.09.2020): 318–23. http://dx.doi.org/10.14311/ap.2020.60.0318.

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Fifteen years ago, polymeric hollow fibre heat exchangers were presented for the first time. Nowadays there are not only the shell-and-tube types as there were at the beginning. In this paper, six chaotised polymeric hollow fibre bundles with a different number of fibres were studied. The bundles presented varied in their fibre diameter, number and shape. These bundles were fixed into the module in such a way that the middle part serves as a cross-flow heat exchanger in an air tunnel. They were tested for air-water application with three different airflow rates. The overall heat transfer coefficients were determined, and the inner and outer heat transfer coefficients were derived. The modules presented achieved a heat transfer rate of up to 1309 W. The overall heat transfer coefficient reached a maximum of 339 Wm−2 K−1.

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Kroulíková, Tereza, Ilya Astrouski, Miroslav Raudenský und Tereza Kůdelová. „Heat Exchanger for Air-Liquid Application with Chaotised Polymeric Hollow Fibres“. Applied Thermal Engineering 197 (Oktober 2021): 117365. http://dx.doi.org/10.1016/j.applthermaleng.2021.117365.

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Bartuli, Erik, Tereza Kůdelová und Miroslav Raudenský. „Shell-and-tube polymeric hollow fiber heat exchangers with parallel and crossed fibers“. Applied Thermal Engineering 182 (Januar 2021): 116001. http://dx.doi.org/10.1016/j.applthermaleng.2020.116001.

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Weiß, Klarissa, Ilya Astrouski, Marcus Reppich und Miroslav Raudenský. „Polymeric Hollow-Fiber Bundles as Immersed Heat Exchangers“. Chemical Engineering & Technology 41, Nr. 7 (08.06.2018): 1457–65. http://dx.doi.org/10.1002/ceat.201700014.

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Song, Liming, Baoan Li, Dimitrios Zarkadas, Saskia Christian und Kamalesh K. Sirkar. „Polymeric Hollow-Fiber Heat Exchangers for Thermal Desalination Processes“. Industrial & Engineering Chemistry Research 49, Nr. 23 (Dezember 2010): 11961–77. http://dx.doi.org/10.1021/ie100375b.

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Dissertationen zum Thema "Polymeric hollow fibers heat exchanger"

Astrouski, Ilya. „Polymeric Hollow Fiber Heat Exchanger Design“. Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2016. http://www.nusl.cz/ntk/nusl-240499.

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This Ph.D. thesis is focused on theory and experimental investigations developing of new knowledge about polymeric hollow fiber heat exchanger (PHFHE). The state-of-the-art study of plastic heat exchangers shows that their usage is limited by several niches where their advantages significantly dominates, or where the use of non-plastic competitors is not impossible. On the other hand, plastic heat exchangers (and PHFHEs in particular) are devices of increasing interest. It is shown that use of small tubes (fibers) allows PHFHEs to be more competitive than conventional plastic heat exchangers. Small hydraulic diameter of a fiber causes high heat transfer coefficients, reduces thermal resistance of plastic wall and allows it to create light and compact design. Detailed study of fluid flow and heat transfer inside the hollow fiber showed that conventional approaches for single-phase laminar flow can be utilized. Poiseuille number equal to 64 and Nussel number about 4 are recommended to be used to predict pressure drops and heat transfer coefficient, respectively. Additional attention should be paid to careful determination of fiber diameter and liquid properties (viscosity). Scaling effects, such as axial heat conduction, thermal entrance region and viscous dissipation can be neglected. The study of outside heat transfer showed that heat transfer on fiber bunches are intense and are competitive to contemporary compact finned-tube heat exchangers. The Grimson approach showed clear correlation with experimental results and, thus is recommended to predict heat transfer coefficients on fiber bunches. Two types of fouling (particulate- and biofouling) of outer fiber surface were experimentally studied. It was found that particulate fouling by titanium oxide particles is not intense and deposits can be removed relatively easy. However, fouling is much more intense when it is associated with biofouling caused by wastewater. In this case, smooth and low-adhesive surface of plastic is not sufficient precaution to prevent deposit formation.

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Ondrejka, Filip. „Nekonvenční chladicí systémy pro Formuli Student“. Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-444964.

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This master’s thesis deals with the design and manufacture of a heat exchanger with polymeric hollow fibers for a Formula Student vehicle. The work can be divided into three parts. The first part contains a review of heat transfer and heat exchangers, the second part deals with polymeric fiber heat exchangers design and manufacture of of polymeric hollow fibers heat exchanger with a heat exchanger for a Formula Student vehicle. The last part deals with the comparison of polymeric hollow fibers heat exchanger with the original aluminum heat exchanger and the evaluation of the measurement results.

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Hvožďa, Jiří. „Matematický model membránové destilace“. Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-445459.

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Diplomová práce se zabývá membránovou destilací, především z matematické perspektivy. Jedná se o tepelně poháněný separační proces, ve kterém se pro rozdělení kapalné a plynné fáze používá porézní membrána. Kapalina se vypařuje a její plynná fáze prochází přes póry v membráně. Během tohoto procesu dochází k tepelné i látkové výměně, které jsou popsány systémem parciálních diferenciálnich rovnic. Další model je založen na analogii s elektrickými obvody, zákonu zachování energie, hmotnostní bilanci a empirických vztazích. Je ověřen s experimentálně naměřenými daty z nové alternativní destilační jednotky používající membránu a kondenzátor z polymerních dutých vláken. Výkon a účinnost jednotky jsou vyhodnoceny. Další možná vylepšení jsou navržena.

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Bartuli, Erik. „Optimization of Heat Transfer Surfaces of Heat Exchangers“. Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-401602.

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Disertační práce je zaměřena na kovové a polymerní výměníky tepla. Hlavním předmětem zkoumání je optimalizace teplosměnných ploch za účelem zvýšení účinnosti výměníku tepla. Tyto cíle byly dosaženy experimentálně a numericky pomocí modelování v ANSYS. Na základě dosažených výsledků byla rozpracována technologie křížového navíjení polymerních výměníků z dutých vláken. Experimentální zařízení původně určené pro navíjení tlakových nádrží bylo modifikované pro automatizovanou výrobu polymerních výměníků z dutých vláken, ježto může být použita při jejich masové výrobě. Tato práce se také zabývala výměníky tepla pro klimatizační systémy. Byly zkoumány možnosti využití polymerních výměníků z dutých vláken v těchto systémech. Mimo jiné byla provedena studie vlivu cyklického tepelného zatížení standardního kovového žebrovaného tepelného výměníku.

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Buchteile zum Thema "Polymeric hollow fibers heat exchanger"

Zhang, Li-Zhi. „Heat and Mass Transfer in Hollow Fiber Membrane Bundles with Randomly Distributed Fibers“. In Conjugate Heat and Mass Transfer in Heat Mass Exchanger Ducts, 233–54. Elsevier, 2013. http://dx.doi.org/10.1016/b978-0-12-407782-9.00008-3.

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Konferenzberichte zum Thema "Polymeric hollow fibers heat exchanger"

Bartuli, Erik, und Tereza Kroulikova. „Testing of Polymeric Hollow Fibre Heat Exchanger with Crossed Hollow Fibres“. In The 5th World Congress on Mechanical, Chemical, and Material Engineering. Avestia Publishing, 2019. http://dx.doi.org/10.11159/htff19.143.

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„The influence of hollow fibers orientation inside the polymeric hollow fiber heat exchanger on the heat transfer intensity“. In Engineering Mechanics 2018. Institute of Theoretical and Applied Mechanics of the Czech Academy of Sciences, 2018. http://dx.doi.org/10.21495/91-8-61.

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Zarkadas, Dimitrios M., Baoan Li und Kamalesh K. Sirkar. „Polymeric Hollow Fiber Heat Exchangers (PHFHEs): A New Type of Compact Heat Exchanger for Lower Temperature Applications“. In ASME 2005 Summer Heat Transfer Conference collocated with the ASME 2005 Pacific Rim Technical Conference and Exhibition on Integration and Packaging of MEMS, NEMS, and Electronic Systems. ASMEDC, 2005. http://dx.doi.org/10.1115/ht2005-72590.

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Plastic heat exchangers are characterized by an inferior thermal performance compared to their metal counterparts. Therefore, their usage is mainly limited to handling corrosive media or when ultra high purity is required, e.g., pharmaceutical industry. Polymeric Hollow Fiber Heat Exchangers (PHFHEs) have recently been proposed [1] as a new type of heat exchanger that can overcome these constraints and offer the same or better thermal performance than metallic shell and tube or plate heat exchangers while occupying a much smaller volume. In this paper we report our results for heat transfer in PHFHEs with both parallel and cross flow in the shell side of the device. Fibers made of polypropylene (PP) and polyetheretherketone (PEEK) were tested. In addition, steam condensation studies in PHFHEs are reported for the first time. The overall heat transfer coefficients achieved for water-water and water-brine systems are as high as 1400 Wm−2K−1. These values are higher than any value reported for plastic heat exchangers and comparable with commonly acceptable design values for metal shell and tube heat exchangers. Similar coefficients were obtained for steam condensation. Polymeric hollow fiber heat exchangers can also achieve high thermal effectiveness, large number of transfer units (NTU) and very small height of a transfer unit (HTU), if properly rated. If designed like commercial membrane contactors, they can achieve up to 12 transfer units in a single device, not longer than 60–70 cm! In addition, the conductance per unit volume PHFHEs achieved was up to one order of magnitude higher compared to metal heat transfer equipment. This superior thermal performance is also accompanied by considerably lower pressure drops. Therefore, the operation of PHFHEs will be characterized by a low operating cost. Combined with the much lower cost, lower weight and elimination of metal contamination polymer materials offer, it is obvious that PHFHEs constitute a potential substitute for metal heat exchangers on both thermal performance and economical grounds. Possible application fields include the food, pharmaceutical and biomedical industries as well as applications where corrosion resistant, light and very efficient devices are required, i.e., desalination, solar and offshore heat transfer applications.

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Raudenský, M., I. Astrouski und T. Bozova. „Polymeric hollow fiber heat exchangers“. In HEAT TRANSFER 2016. Southampton UK: WIT Press, 2016. http://dx.doi.org/10.2495/ht160101.

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Raudenský, Miroslav. „Polymeric hollow fiber heat exchangers“. In 38TH MEETING OF DEPARTMENTS OF FLUID MECHANICS AND THERMODYNAMICS. AIP Publishing, 2019. http://dx.doi.org/10.1063/1.5114727.

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Brozova, Tereza, Miroslav Raudensky und Ilya Astrouski. „FLEXIBLE POLYMERIC HOLLOW FIBER HEAT EXCHANGERS“. In 3rd Thermal and Fluids Engineering Conference (TFEC). Connecticut: Begellhouse, 2018. http://dx.doi.org/10.1615/tfec2018.hte.020837.

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Brozova, Tereza, und Erik Bartuli. „Influence of Condensation on the Outer Surface of Polymer Hollow Fiber Heat Exchangers During Heat Transfer“. In ASME 2018 16th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/icnmm2018-7728.

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Condensation during heat transfer processes can be very beneficially used due to the large amount of energy contained in phase change (vapor to liquid). This contribution focuses on the possible use of polymer hollow fiber heat exchangers (PHFHEs) in air conditioning. PHFHEs consist of hundreds or thousands of polymer hollow fibers with an outer diameter of around 1 mm. The wall thickness is approximately 10% of the outer diameter. PHFHEs are heat exchangers with such benefits as low weight, easy shaping, corrosion resistance, and resistance to many chemical solutions. In comparison with metal heat exchangers (made of copper, aluminum, or stainless steel) the plastic wall of PHFHEs has low thermal conductivity (between 0.1 and 0.4 Wm-1K-1). This seems to be their key disadvantage. However, due to the extremely small thickness of the fiber’s wall this disadvantage is negligible. PHFHEs are compact heat exchangers with a large heat transfer area with respect to their volume. This paper shows the results of condensation tests for PHFHEs that consist of 6 equivalent layers of polypropylene fibers with a length of 190 mm. The total number of fibers is 798. The air humidity was set to 50% with an air temperature of 27°C, which are the typical conditions for such tests in air conditioning technology. Another important parameter was the velocity of the air. Testing velocities were chosen as 3 m s−1 and 1 m s−1. The influence of gravity was studied by putting the PHFHEs in three different positions. The fibers were placed in horizontal and vertical positions, and in a position where fibers form an angle of 45° with the ground. The study showed the ineffectiveness of placing the PHFHE in a horizontal position and suggests that it is better to have a larger distance between the layers of fibers.

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Raudensky, Miroslav, Ilya Astrouski, Tereza Brozova und Erik Bartuli. „Flexible polymeric hollow fiber heat exchangers for electronic systems“. In 2016 15th IEEE Intersociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems (ITherm). IEEE, 2016. http://dx.doi.org/10.1109/itherm.2016.7517677.

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Kroulíková, T., I. Astrouski und T. Kůdelová. „PRESSURE DROP STUDY OF POLYMERIC HOLLOW FIBER HEAT EXCHANGERS“. In Engineering Mechanics 2020. Institute of Thermomechanics of the Czech Academy of Sciences, Prague, 2020. http://dx.doi.org/10.21495/5896-3-314.

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„Condensation on the outer surface of polymer hollow fiber heat exchangers and its influence to the heat transfer“. In Engineering Mechanics 2018. Institute of Theoretical and Applied Mechanics of the Czech Academy of Sciences, 2018. http://dx.doi.org/10.21495/91-8-117.

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