Intensification of heat transfer of polymeric hollow fiber heat exchangers by chaotisation

Raudenský, Miroslav; Astrouski, Ilya; Dohnal, Miroslav

doi:10.1016/j.applthermaleng.2016.11.038

Cited by 31 publications

(17 citation statements)

References 8 publications

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“…The authors formulate the concern over the connecting hundreds of tubes to headers. The literature proves that this problem was already solved (Krasny, 2016;Raudensky, , 2017.…”

Section: Introductionmentioning

confidence: 97%

“…The study proves that potted bundles are able to stand up more than 10 6 pressure cycles at 3.5 bar with temperature of surrounding 80 °C . More information can be found in literature -e.g., (Astrouski, 2016(Astrouski, , 2015Raudensky, 2017;Chen, 2016 There are two modes of condensation that can occur on the outer surface, the dropwise and film condensation (Incropera, 2011;Umur, 1965). The character of condensation is affected by the wettability of the surface.…”

Section: Introductionmentioning

confidence: 99%

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Condensation on the outer surface of polymer hollow fiber heat exchangers and its influence to the heat transfer

2018

Engineering Mechanics

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Condensation influences significantly the heat transfer. Describing its mechanism is necessary for better understanding and leads to its beneficial use in applications. The contribution deals with the condensation on the outer surface of polymer hollow fibers that are made of polypropylene with outer diameter 0.8 mm. These fibers form the heat exchanger with total amount 2660 fibers that are divided into 20 equivalent layers. The wall thickness is approximately 10% of outer diameter. The testing air properties were set at 27 °C and 50% relative humidity that are the typical conditions for such tests in air-conditioning technology. The study focuses on the influence of the gravity and the air speed. Therefore, the polymer hollow fibers heat exchanger (PHFHE) was placed in three different positions (vertical, horizontal, and 45°) and the air velocity were chosen as 1 m s -1 and 3 m s -1 . The experiments shows that the PHFHE are able to stand up the conditions in air-conditioning applications. Moreover, they achieved the competitive results with common metal heat exchangers. The paper claims the perspective of PHFHE in air-conditioning technology.

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“…The authors formulate the concern over the connecting hundreds of tubes to headers. The literature proves that this problem was already solved (Krasny, 2016;Raudensky, , 2017.…”

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Condensation on the outer surface of polymer hollow fiber heat exchangers and its influence to the heat transfer

2018

Engineering Mechanics

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“…It is necessary to separate the fibres to guarantee the effective usage of the heat transfer area. The chaotization of the structure of PHFHEs and its influence on their intensification is studied in [4].…”

Section: Introductionmentioning

confidence: 99%

The Influence of the Fibres Arrangement on Heat Transfer and Pressure Drop of Polymeric Hollow Fibre Heat Exchangers

et al. 2020

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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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“…They can also be used effectively in heating, ventilating and air conditioning technology. 3 The service life testing of such heat exchangers is described in the study by Brozova et al 4 More information can be found in the works of Astrouski, 5 Astrouski et al 6 and Raudensky et al 7 Another possible use of polymer hollow fibres is as polymer hollow fibre membranes for filtration and separation of gaseous air pollutants. 8,9 These membranes also have to be potted in the bundles that may subsequently be used.…”

Section: Introductionmentioning

confidence: 99%

Determination of surface wettability of polymeric hollow fibres

Brožová

Raudenský

2018

Journal of Elastomers & Plastics

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Surface wettability significantly affects the condensation and therefore the heat transfer when condensation occurs. The materials are classified as either hydrophobic or hydrophilic. Materials with a lower contact angle are more suitable for heat transfer applications associated with condensation. The dynamic contact angle is one way to define surface wettability. In this contribution, the Wilhelmy method was used for measuring the force of the interaction of a fibre at the liquid-gas interface. The method is based on immersing a sample in a liquid and then removing it. This study compares the influence of the type of polymeric material and surface finishes of hollow fibres on the dynamic contact angle. Polypropylene fibres and polypropylene fibres with a Trapylen ® , (TRAMACO GmbH, Germany) surface finish achieve a larger dynamic contact angle (the advancing dynamic contact angle measured in water is around 100). Therefore, they seem to be a better alternative than polycarbonate, polyether ether ketone and polyamide (the advancing dynamic contact angle in water is around 80).

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Intensification of heat transfer of polymeric hollow fiber heat exchangers by chaotisation

Cited by 31 publications

References 8 publications

Condensation on the outer surface of polymer hollow fiber heat exchangers and its influence to the heat transfer

Condensation on the outer surface of polymer hollow fiber heat exchangers and its influence to the heat transfer

The Influence of the Fibres Arrangement on Heat Transfer and Pressure Drop of Polymeric Hollow Fibre Heat Exchangers

Determination of surface wettability of polymeric hollow fibres

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