The effect of geometrical modifications to a shell and tube heat exchanger on performance and freezing risk during LNG regasification

Brenk, Arkadiusz; Kielar, Jakub; Malecha, Ziemowit; Rogala, Zbigniew

doi:10.1016/j.ijheatmasstransfer.2020.120247

Cited by 10 publications

(4 citation statements)

References 30 publications

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“…The application of water-based heating fluids is associated with freezing risk [64,78]. In the work [78], the authors showed that the risk of total freezing could be indicated by a critical value of Reynolds number and that flattened tubes could improve heat transfer, ensure higher reliability and decrease a pump duty needed to supply a shell-and-tube heat exchanger.…”

Section: Lng Regasification and Chosen Challenges Of Lng Two-phase Heat Exchangersmentioning

confidence: 99%

Liquefied Natural Gas in Mobile Applications—Opportunities and Challenges

et al. 2020

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Liquefied natural gas (LNG) is one of the most influential fuels of the 21st century, especially in terms of the global economy. The demand for LNG is forecasted to reach 400 million tonnes by 2020, increasing up to 500 million tonnes in 2030. Due to its high mass and volumetric energy density, LNG is the perfect fuel for long-distance transport, as well as for use in mobile applications. It is also characterized by low levels of emissions, which is why it has been officially approved for use as a marine fuel in Emission Control Areas (ECAs) where stricter controls have been established to minimize the airborne emissions produced by ships. LNG is also an emerging fuel in heavy road and rail transport. As a cryogenic fuel that is characterized by a boiling temperature of about 120 K (−153 °C), LNG requires the special construction of cryogenic mobile installations to fulfill conflicting requirements, such as a robust mechanical construction and a low number of heat leaks to colder parts of the system under high safety standards. This paper provides a profound review of LNG applications in waterborne and land transport. Exemplary constructions of LNG engine supply systems are presented and discussed from the mechanical and thermodynamic points of view. Physical exergy recovery during LNG regasification is analyzed, and different methods of the process are both analytically and experimentally compared. The issues that surround two-phase flows and phase change processes in LNG regasification and recondensation are addressed, and technical solutions for boil-off gas recondensation are proposed. The paper also looks at the problems surrounding LNG installation data acquisition and control systems, concluding with a discussion of the impact of LNG technologies on future trends in low-emission transport.

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Section: Lng Regasification and Chosen Challenges Of Lng Two-phase Heat Exchangersmentioning

confidence: 99%

Liquefied Natural Gas in Mobile Applications—Opportunities and Challenges

et al. 2020

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“…Among the techniques used to minimize this thermal resistance is the change in the bundle arrangement and shapes fins and tubes. To improve the overall heat transfer and flow characteristics of heat exchangers, a number of geometric parameters are applied [3][4][5][6][7]. On the other hand, changing the forms and configurations of the tubes in sinusoidal wavy fins, remains a viable strategy for improving heat transfer properties while incurring a pumping power penalty.…”

Section: Introductionmentioning

confidence: 99%

Numerical study to predict optimal configuration of wavy fin and tube heat exchanger with various tube shapes

et al. 2022

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This paper aims to investigate the influence of tube shapes on thermal-flow characteristics of sinusoidal wavy finned-tube heat exchangers. Two row staggered bundle with six geometries of tubes (four flat tube geometries, one oval tube and a circular tube) are analyzed for a range of (1600 Re 4800). The inspection revealed that the heat flux and the pressure drop decrease with the tube flatness for all Reynolds values. However, the oval tube O1 reaches, for all Reynolds values, the lowest values of heat flux and pressure drop. Regarding the global performance criterion, the sinusoidal wavy fins with O1 shaped tubes reached the highest global performance values, being 14.8–24.4% and 31.6–36.3% higher than the fin with F1 and O2 tube geometry, respectively.

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“…With the use of ultra-low temperatures in industrial production and aerospace applications, the frosting that can occur on cryogenic surfaces during application is of increasing concern. For example, as liquefied natural gas (LNG) [1][2][3] has become more widespread, LNG vaporization units have evolved. Ambient air vaporizers (AAVs) [4][5][6][7], which utilize the atmosphere as a heat source to vaporize liquid natural gas, may experience surface frosting during operation.…”

Section: Introductionmentioning

confidence: 99%

Simulation of Forced Convection Frost Formation in Microtubule Bundles at Ultra-Low Temperature

et al. 2022

Aerospace

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Hypersonic vehicles are an important area of research in the aerospace field today. One of the important issues is the power of the engine. In order to achieve large-span flight speeds, a more efficient approach is to use combined power systems. However, the problem of pre-cooler icing can occur in combined engine applications. The flow in the pre-cooler is extremely complex. Outside the tube is the high-temperature wet air entering from the engine intake, and the tube cooling is the ultra-low temperature cooling medium. Icing not only increases the heat exchange resistance of the pre-cooler during operation and affects the heat exchange performance of the pre-cooler, but also causes a large total pressure loss, resulting in a degradation of the engine performance. There is a lack of research on the icing law of the pre-cooler under different parameters. Therefore, it is necessary to conduct a corresponding numerical calculation study on pre-cooler icing and explore the influence of various influencing factors on icing. In this paper, a mathematical model of icing (frost) is established for the frosting phenomenon that may occur during the operation of the pre-cooler. Additionally, the principle of heat and mass transfer in the icing process is described by the mathematical model, and the influence of different parameters on the frosting parameters is explored by using the computational fluid dynamics (CFD) method. The law of tube bundle icing under different parameters was calculated, and the variation laws of frost layer morphology and wet air pressure drop were obtained. The laws of tube bundle icing under different parameters were calculated, and the changes in frost layer pattern and wet air pressure drop when each parameter was changed, which can provide guidance for the design and application of pre-coolers in the future.

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The effect of geometrical modifications to a shell and tube heat exchanger on performance and freezing risk during LNG regasification

Cited by 10 publications

References 30 publications

Liquefied Natural Gas in Mobile Applications—Opportunities and Challenges

Liquefied Natural Gas in Mobile Applications—Opportunities and Challenges

Numerical study to predict optimal configuration of wavy fin and tube heat exchanger with various tube shapes

Simulation of Forced Convection Frost Formation in Microtubule Bundles at Ultra-Low Temperature

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