Experimental study of convective heat transfer coefficients of CO2 hydrate slurries in a secondary refrigeration loop

Oignet, Jérémy; Hoang, Hong-Minh; Osswald, Véronique; Delahaye, Anthony; Fournaison, Laurence; Haberschill, Philippe

doi:10.1016/j.applthermaleng.2017.02.117

Cited by 39 publications

(8 citation statements)

References 43 publications

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“…Hydrate formation can be promoted in several ways, including through the use of porous materials [26][27][28]. As hydrate formation is an exothermic process that proceeds at low temperatures, heat and mass transfer in the system play an important role [29,30]. The presence of a porous medium improves heat transfer conditions by increasing the thermal conductivity coefficient.…”

Section: Introductionmentioning

confidence: 99%

Influence of Water Saturation, Grain Size of Quartz Sand and Hydrate-Former on the Gas Hydrate Formation

et al. 2021

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The development of technologies for the accelerated formation or decomposition of gas hydrates is an urgent topic. This will make it possible to utilize a gas, including associated petroleum one, into a hydrate state for its further use or to produce natural gas from hydrate-saturated sediments. In this work, the effect of water content in wide range (0.7–50 mass%) and the size of quartz sand particles (porous medium; <50 μm, 125–160 μm and unsifted sand) on the formation of methane and methane-propane hydrates at close conditions (subcooling value) has been studied. High-pressure differential scanning calorimetry and X-ray computed tomography techniques were employed to analyze the hydrate formation process and pore sizes, respectively. The exponential growth of water to hydrate conversion with a decrease in the water content due to the rise of water–gas surface available for hydrate formation was revealed. Sieving the quartz sand resulted in a significant increase in water to hydrate conversion (59% for original sand compared to more than 90% for sieved sand). It was supposed that water suction due to the capillary forces influences both methane and methane-propane hydrates formation as well with latent hydrate forming up to 60% either without a detectable heat flow or during the ice melting. This emphasizes the importance of being developed for water–gas (ice–gas) interface to effectively transform water into the hydrate state. In any case, the ice melting (presence of thawing water) may allow a higher conversion degree. Varying the water content and the sand grain size allows to control the degree of water to hydrate conversion and subcooling achieved before the hydrate formation. Taking into account experimental error, the equilibrium conditions of hydrates formation do not change in all studied cases. The data obtained can be useful in developing a method for obtaining hydrates under static conditions.

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Section: Introductionmentioning

confidence: 99%

Influence of Water Saturation, Grain Size of Quartz Sand and Hydrate-Former on the Gas Hydrate Formation

et al. 2021

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“…Hydrate slurries are thus good options for secondary refrigeration [8][9][10] or cold storage [7,11]. Their rheology [12,13], thermal properties [14,15], and phase-change kinetics [11,16,17] have been studied extensively. Apart from these characterization studies, performance analyses of secondary refrigeration systems using hydrate slurries are still scarce [18][19][20][21].…”

Section: Mmentioning

confidence: 99%

Energy analysis of two-phase secondary refrigeration in steady-state operation, part 1: Global optimization and leading parameter

Pons

Hoang²,

Dufour

et al. 2018

Energy

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A great deal of attention is paid to secondary refrigeration as a means of reducing excessively high emissions of refrigerants (most of which have a potent greenhouse effect) due to leaks in large cooling units. Among the environmentally friendly fluids that can be used in secondary circuits for transporting and storing cold, hydrate slurries offer the advantage of significant latent heats of fusion associated with good fluidity. Research programs have focused attention on hydrate systems, including CO 2 , TBPB (tetra-n-butyl-phosphonium-bromide), and mixed CO 2-TBPB hydrates. In addition to feasibility concerns, energy efficiency is also a crucial concern requiring an objective analysis of the improvements likely to result from these new materials. An impartial framework was thus constructed based on the principles of optimization methods. This approach was applied to these three hydrate slurries as well as to the well-known ice slurry for comparison purposes. A numerical model of secondary

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“…A phase change material used for a latent heat transportation system is selected based on a temperature demanded in a system. Different types of latent heat slurries have been used in industries [1][2][3][4][5]. Ice/water slurries are one of the most common secondary refrigerants for low temperature [5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

“…In order to solve the problem, a number of studies about ice slurries have been made. Several techniques to prevent the agglomeration of ice particles was proposed by many researches [4].…”

Section: Introductionmentioning

confidence: 99%

Ammonium alum hydrate slurries with surfactants and polyvinyl alcohol as a latent heat transportation material for high temperature

Hidema

Tano

Sato

et al. 2018

International Journal of Heat and Mass Transfer

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Experimental study of convective heat transfer coefficients of CO2 hydrate slurries in a secondary refrigeration loop

Cited by 39 publications

References 43 publications

Influence of Water Saturation, Grain Size of Quartz Sand and Hydrate-Former on the Gas Hydrate Formation

Influence of Water Saturation, Grain Size of Quartz Sand and Hydrate-Former on the Gas Hydrate Formation

Energy analysis of two-phase secondary refrigeration in steady-state operation, part 1: Global optimization and leading parameter

Ammonium alum hydrate slurries with surfactants and polyvinyl alcohol as a latent heat transportation material for high temperature

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