Thematische Bibliographien / Polymeric hollow fibers heat exchanger / Zeitschriftenartikel
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Zeitschriftenartikel zum Thema „Polymeric hollow fibers heat exchanger“

Autor: Grafiati
Veröffentlicht am 28. Juni 2021
Zuletzt aktualisiert am 2. Februar 2022

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1

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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2

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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3

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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4

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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5

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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6

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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7

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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8

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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9

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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10

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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11

Raudenský, Miroslav, Ilya Astrouski und Miroslav Dohnal. „Intensification of heat transfer of polymeric hollow fiber heat exchangers by chaotisation“. Applied Thermal Engineering 113 (Februar 2017): 632–38. http://dx.doi.org/10.1016/j.applthermaleng.2016.11.038.

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12

Zarkadas, Dimitrios M., und Kamalesh K. Sirkar. „Polymeric Hollow Fiber Heat Exchangers: An Alternative for Lower Temperature Applications“. Industrial & Engineering Chemistry Research 43, Nr. 25 (Dezember 2004): 8093–106. http://dx.doi.org/10.1021/ie040143k.

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13

Li, Baoan, und Han Han Fan. „A High-Performance Heat Exchanger Using Modified Polyvinylidene Fluoride-Based Hollow Fibers“. Advanced Materials Research 479-481 (Februar 2012): 115–19. http://dx.doi.org/10.4028/www.scientific.net/amr.479-481.115.

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Plastic heat exchangers has the shortcomings of bulky, thick pipe wall with large thermal resistance, poor heat transfer, aging of plastic and a narrow temperature range. The key to increase the heat transfer performance of heat exchanger is improving thermal performance of heat conduction.To enhance heat transfer effects and expand the temperature range of using plastic heat exchanger, PVDF with good temperature resistance is used as matrix and modification with graphite fillers to prepare composite hollow fiber which has the advantage of small diameter, thin wall and good thermal conductivity. Also, composite materials hollow fibers are used to prepare shell and tube hollow fiber heat exchanger.The testing of "water - water" system for our heat exchanger module has been done, and the results indicate that adding graphite is helpful to improve thermal conductivity of PVDF-based heat conductive hollow fiber heat exchanger to a certain extent.hen the content of graphite is 3%, the heat transfer effect is the best.
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14

Yi, Jin Woo, Sang Bok Lee, Jin Bong Kim, Sang Kwan Lee, Ki Hyeon Kim und O. Ok Park. „Evaluation of Composites Containing Hollow Ni/Fe-Co Fibers on Near-Field Electromagnetic Wave Absorbing Properties“. Advanced Materials Research 123-125 (August 2010): 1223–26. http://dx.doi.org/10.4028/www.scientific.net/amr.123-125.1223.

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In order to develop an effective near-field electromagnetic (EM) wave absorber, we have fabricated polymeric thin films including hollow metallic microfibers. Hydrolyzed polymer micro fibers (~2.5 ㎛) were used as a substrate material for the electroless metal plating. Nickel and subsequent Fe-Co metal layers were coated on the surface of activated polymer fibers and then heat treatment for the hollow structure as well as the densification of metallic layers was performed under the Argon atmosphere. Unlike conventional particulate or flaky metal powders, these fibers can play a significant role in elevating the magnetic property of polymer films, resulting in the increased efficiency of EM absorbing properties. In addition, their hollow structure can also lower their apparent density. SEM and EDS analysis were carried out to verify the morphology and metal compositions. Polymeric thin films containing hollow Ni/Fe-Co micro fibers were prepared to investigate the effect of metal compositions, filler distribution and heat treatment conditions on not only the near-field absorbing performance, but also magnetic properties such as permeability and magnetization. For the measurement of near-field EM absorbance in the frequency range of ~6GHz, micro strip line and network analyzer were used.
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15

Bartuli, E., und M. Raudensky. „Numerical investigation of heat transfer on the outer surface of polymeric hollow fibers“. Materiali in tehnologije 52, Nr. 4 (10.08.2018): 459–63. http://dx.doi.org/10.17222/mit.2016.221.

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16

Kazi, Salim N. „Fouling and fouling mitigation of calcium compounds on heat exchangers by novel colloids and surface modifications“. Reviews in Chemical Engineering 36, Nr. 6 (26.08.2020): 653–85. http://dx.doi.org/10.1515/revce-2017-0076.

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AbstractFouling is the accumulation of unwanted materials on surfaces that causes detrimental effects on its function. The accumulated materials can be composed of living organisms (biofouling), nonliving substances (inorganic and/or organic), or a combination of both of them. Mineral fouling occurs when a process uses cooling water supersaturated with mineral salt crystals (i.e. hard water). Precipitation ensues on heat transfer surfaces whenever the inversely soluble dissolved calcium salt ions are exposed to high temperature. Mineral salts, dirt, waxes, biofilms, whey proteins, etc. are common deposits on the heat exchanger surfaces, and they create thermal resistance and increase pressure drop and maintenance costs of plants. Fouling of dissolved salts and its mitigation have been studied in detail by varying process parameters, surface materials, coatings on surfaces, additives, etc. by many researchers. In the present stage, researchers have considered polymeric additives, environmental friendly nanoparticles, natural fibers, and thermal conductive coatings (metallic and polymeric) in the study of mitigation of fouling. A better understanding of the problem and the mechanisms that lead to the accumulation of deposits on surfaces will provide opportunities to reduce or even eliminate the problem in certain situations. The present review study has focused on fouling phenomena, environment of fouling, heat exchanger fouling in design, and mitigation of fouling. The findings could support in developing the improved heat exchanger material surfaces, retain efficiency of the heat exchangers, and prolong their continuous operation.
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17

Hejčík, Jiří, Pavel Charvát, Lubomír Klimeš und Ilya Astrouski. „A PCM-water heat exchanger with polymeric hollow fibres for latent heat thermal energy storage: a parametric study of discharging stage“. Journal of Theoretical and Applied Mechanics, 15.10.2016, 1285. http://dx.doi.org/10.15632/jtam-pl.54.4.1285.

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