New application of plate–fin heat exchanger with regenerative cryocoolers

Chang, Ho‐Myung; Gwak, Kyung Hyun

doi:10.1016/j.cryogenics.2015.04.005

Cited by 9 publications

(3 citation statements)

References 20 publications

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“…The outcome of this experiment showed that the Nusselt number for a vibrating fin is normalized to its value for a static fin and also it is affected effectively by the ratio of the vibrating speed and the velocity of buoyancy‐driven flow. Chang and Gwak 2 suggested a new application for a plate‐fin heat exchanger with regenerative cryocoolers, which adequately absorb coolant stream and deliver it to the coldhead of the cryocooler. The results showed that the plate‐fin heat exchanger has 30% to 50% more efficiency in cooling rate than that in the tubular heat exchanger.…”

Section: Experimental Studiesmentioning

confidence: 99%

Improvement of heat transfer through fins: A brief review of recent developments

Maji¹,

Choubey

2020

Heat Trans

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Fins or extended surfaces are generally used in heat exchangers to enhance heat transfer between the main surface and ambient fluid. Various types of simple-shaped fins, namely, rectangular, square, annular, cylindrical, and tapered, have been used with different geometrical combinations. To satisfy industrial demand, different trials have also been carried out for designing optimized fins. The optimization of fins can be performed either by enhancing heat dissipation at an exact fin weight or by diminishing the weight of the fin by precise heat dissipation. Recently a notable amount of work on some typical fins, like, porous fins and perforated fins, has also been carried out. This paper presents a brief review on heat transfer enhancement using fins of different types considering variable thermophysical and geometric parameters, which will also be useful for future use of geometrical modifications of extended surfaces, based on the cost and availability of space.analytical approach, computational approach, experimental approach, perforated fin, porous fin | INTRODUCTIONAdvanced technologies need high-performance heat transfer equipment. Techniques for enhancing the heat transfer rate are classified into two categories: active and passive methods. In the design point of view, active methods are complex as they require some extraneous power input for necessary flow adjustments and to improve the heat transfer rate and thus applications are limited. On the other hand, passive methods require geometrical or surface adjustments to the flow passage by incorporating additional devices. Additionally, by interrupting or varying the existing flow behavior (except for extended surfaces); higher heat transfer coefficients are promoted through this method, which is also followed by an increase in the corresponding pressure drop. The amount of conduction, convection, and radiation of an object shows the amount of heat it transfers. The heat transfer rate is enhanced by increasing the temperature difference between the object and the environment or by enhancing the coefficient of convective heat transfer or by maximizing the surface area of the body. In some cases, it is not appropriate or cost effective to alter the first two options. Introducing a fin to a body, however, expands the surface area and sometimes this is a cost-effective solution for heat transfer problems. Extended surfaces or fins are illustrations of passive methods that are generally used in different industrial applications for the enhancement of heat transfer between the primary surface (heat sink) and the surrounding fluid. Currently reducing the cost and size of fins is the key target of the fin industry. This demand is generally met by the high-thermal-conductivity and costly metals used to fabricate finned surfaces. Many efforts have been made to construct optimized fins. (a) By changing the size and shape of the solid fin: Instead of a longitudinal rectangular solid fin, if the geometry of fin design is changed, the performance parameters and heat tr...

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Section: Experimental Studiesmentioning

confidence: 99%

Improvement of heat transfer through fins: A brief review of recent developments

Maji¹,

Choubey

2020

Heat Trans

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“…Other advantages are that (a) it can make intermediate entries and exits of streams and (b) it has a low weight (Das and Ghosh, 2012). PFHEs find their applications in the aerospace industry, automobile sector, air separation plants, gas liquefaction processes, regenerative cryocoolers, high-temperature superconductivity (HTS), cryogenic systems, and helium systems (Chang and Gwak, 2015;Yang et al, 2016). PFHEs are now also used in the cryogenic CO2-capturing process (Tan et al, 2017a).…”

Section: Introductionmentioning

confidence: 99%

Design of Plate-Fin Heat Exchanger for CO₂ Separation by Cryogenic Distillation

Nandakishora

Maldeniyaarachchi

Sahoo

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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Carbon capture, utilization, and storage (CCUS) is a technique to curb carbon dioxide (CO2) emissions from significant point sources. CO2 separation is the first stage in the CCUS. Cryogenic CO2 separation is the emerging method of separating CO2 from different sources. Plate-fin heat exchanger (PFHE) is one of the compact heat exchangers generally used in cryogenic applications. Due to its advantages, it is also used in the cryogenic CO2 separation process. In this analysis, a PFHE is designed and analyzed by using an analytical method and Aspen software, and the results are compared. In the analytical design, the Maiti and Sarangi correlations are considered. The effect of the change in the thermos-physical properties on the volume and cost of the heat exchanger (HX) is analyzed. The energy penalty to separate CO2 from a CO2/N2 gas mixture with a 30% CO2 concentration is observed to be 1.063 MJ/kg of CO2. The volumes of HXs “A” and “B” determined by the analytical approach are found to be around 0.323 m3 and 0.978 m3, respectively. The volumes of HXs “A” and “B” by the Aspen EDR approach are found to be around 0.239 m3 and 0.839 m3, respectively.

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“…At present, because of its large heat transfer area and high heat transfer efficiency, plate-fin heat exchangers are widely used in aerospace, nuclear power and fuel cells, oil engineering, and other fields [1][2][3]. A plate-fin heat exchanger is composed of baffle plates, fins, and seals, which are connected by brazing.…”

Section: Introductionmentioning

confidence: 99%

Crack Propagation of SS304/BNi-2 Brazed Joints: Experiments and Numerical Simulations

Zhou

Jiang

Tan

et al. 2019

Metals

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The strength of brazed joints is of great significance for plate-fin heat exchangers. Although a lot of research on the strength of brazed joints has been carried out, few studies have focused on the whole process of the crack propagation of brazed joints under loading, and no accurate simulation methods have been published. In this paper, the crack propagation of SS304/BNi-2 brazed joints was investigated by both experiments and numerical simulations. The cohesive zone model (CZM) was applied to simulate the crack propagation. The cohesive energy was obtained by the T-type brazed joint peeling experiments. The cohesive strength was determined as 30 MPa by comparing the load–displacement curves from the simulations and experiments. The results showed that the crack propagation process predicted by the CZM was consistent with the experimental results. Furthermore, with the increase of displacement applied on the specimen, the rate of crack propagation of the brazed joints was high at the beginning, and then gradually slowed down in the later stages. Under displacement-controlled conditions, increasing the thickness and the yield strength of the base metal could delay the crack initiation, but it would increase the crack growth rate once the crack was initiated.

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New application of plate–fin heat exchanger with regenerative cryocoolers

Cited by 9 publications

References 20 publications

Improvement of heat transfer through fins: A brief review of recent developments

Improvement of heat transfer through fins: A brief review of recent developments

Design of Plate-Fin Heat Exchanger for CO₂ Separation by Cryogenic Distillation

Crack Propagation of SS304/BNi-2 Brazed Joints: Experiments and Numerical Simulations

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New application of plate–fin heat exchanger with regenerative cryocoolers

Cited by 9 publications

References 20 publications

Improvement of heat transfer through fins: A brief review of recent developments

Improvement of heat transfer through fins: A brief review of recent developments

Design of Plate-Fin Heat Exchanger for CO2 Separation by Cryogenic Distillation

Crack Propagation of SS304/BNi-2 Brazed Joints: Experiments and Numerical Simulations

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Design of Plate-Fin Heat Exchanger for CO₂ Separation by Cryogenic Distillation