Effect of phase transition temperature and thermal conductivity on the performance of Latent Heat Storage System

Bie, Yu; Li, Ming; Malekian, Reza; Chen, Fei; Feng, Zhikang; Li, Zhixiong

doi:10.1016/j.applthermaleng.2018.02.036

Cited by 29 publications

(6 citation statements)

References 30 publications

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“…The following equation is used to calculate the spin temperature: (10) where s i is vector representing the magnetic spin of the particle, ω i is the magnetic moment, and ℏ is the Planck constant. This approach to calculate spin temperature was proposed in [44].…”

Section: A Mathematical Model For Studying the Magnetic Properties Of...mentioning

confidence: 99%

“…The functioning of such storage media is based on energy fluctuations in the process of crystallization or melting of the media. In contrast to traditional media, thermal storage does not require sealing of the working volume during change of aggregate states, and is actively implemented as a highly efficient and energy-saving technology in the field of construction [ 9 ] and solar energy [ 10 ].…”

Section: Introductionmentioning

confidence: 99%

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The influence of structure and local structural defects on the magnetic properties of cobalt nanofilms

Vakhrushev¹,

Fedotov²,

Severyukhina³

et al. 2023

Beilstein J. Nanotechnol.

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The present paper considers a mathematical model describing the time evolution of spin states and magnetic properties of a nanomaterial. We present the results of two variants of nanosystem simulations. In the first variant, cobalt with a structure close to the hexagonal close-packed crystal lattice was considered. In the second case, a cobalt nanofilm formed in the previously obtained numerical experiment of multilayer niobium–cobalt nanocomposite deposition was investigated. The sizes of the systems were the same in both cases. For both simulations, after pre-correction in the initial time stages, the value of spin temperature stabilized and tended to the average value. Also, the change in spin temperature occurred near the average value. The system with a real structure had a variable spin temperature compared to that of a system with an ideal structure. In all cases of calculations for cobalt, the ferromagnetic behavior was preserved. Defects in the structure and local arrangement of the atoms cause a deterioration in the magnetic macroscopic parameters, such as a decrease in the magnetization modulus.

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Section: A Mathematical Model For Studying the Magnetic Properties Of...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The influence of structure and local structural defects on the magnetic properties of cobalt nanofilms

Vakhrushev¹,

Fedotov²,

Severyukhina³

et al. 2023

Beilstein J. Nanotechnol.

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show abstract

“…NGH dissociation in marine sediments is an endothermic process of phase transition. The latent heat for per kilogram of NGH in the process of phase transition can be evaluated from the given formula [55,56]:…”

Section: Computation Of Variables and Numerical Solutionmentioning

confidence: 99%

Dynamic Characteristics of Offshore Natural Gas Hydrate Dissociation by Depressurization in Marine Sediments

Liu

Wu³

2019

Geofluids

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Dynamic characteristics of offshore natural gas hydrate (NGH) dissociation will provide the theoretical basis to analyze technical issues of oceanic hydrate exploitation. A mathematical model is developed to simulate offshore NGH dissociation by depressurization in marine sediments. Different phase combination statuses are involved in the process of NGH dissociation by taking ice melting and water freezing into account. The proposed methodology can analyze the processes of hydrate and water phase transitions, decomposition kinetics and thermodynamics, viscosity and permeability, ice-water phase equilibrium, and natural gas and water production. A set of an experimental system is built and consists of one 3-D visual reactor vessel, one isothermal seawater vessel, one natural gas and water separator, and one data acquisition unit. The experiments on offshore NGH dissociation by depressurization in 3-D marine sediments are carried out, and this methodology is validated against the full-scale experimental data measured. The results show that during the prophase, natural gas flow is preceded by water flow into the production wellbore and natural gas occupies more continuous flow channels than water under a large pressure gradient. Then, the natural gas flow rate begins to decline accompanied by an increase of water production. During the second phase, natural gas flow rate decreases slowly because of the decreased temperature of hydrate-bearing formation and low pressure gradient. The lower the intrinsic permeability in marine sediments, the later the water flow rate reaches the peak production. And the space interval of the production wellbore should be enlarged by an increase of the intrinsic permeability. The stable period of natural gas production enhances, and the water flow rate reduces with the increase of bottom-hole pressure in production wellbores. The main reason is the slow offshore NGH dissociation under the low producing pressure and the restriction of heat conductivity under the low temperature.

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“…The functioning of such storage media is based on energy fluctuations in the process of crystallization or melting of the substance. In contrast to traditional media, thermal storage does not require sealing of the working volume during the change of aggregate states and is actively implemented as a highly efficient and energy-saving technology in the field of construction [9] and solar energy [10].…”

Section: Introductionmentioning

confidence: 99%

Structure and local structural defects influence on the magnetic properties of cobalt nanofilms

Vakhrushev¹,

Fedotov²,

Severyukhina³

et al. 2022

Preprint

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The paper considers a mathematical model describing the time evolution of spin states and magnetic properties of a nanomaterial. We present the two variants of nanosystems simulations results. In the first variant, cobalt with a structure close to the hexagonal close-packed crystal lattice was considered. In the second case, the volume of the same size cobalt nanofilm formed in the previously obtained computational experiment of multilayer niobium-cobalt nanocomposite deposition was investigated. For both simulations, it is obtained that, after pre-correction and significant jumps in the initial time moments, the change in spin temperature occurs in a small range of values near the average value. The system with a real structure has a less stable behavior of the spin temperature and a larger scatter of instantaneous values. For all cases of calculations for cobalt, the ferromagnetic character of the behavior is preserved. Defects in the structure and the local arrangement of the atoms can cause a deterioration of the magnetic macroscopic parameters, such as a decrease in the magnetization modulus.

show abstract

Effect of phase transition temperature and thermal conductivity on the performance of Latent Heat Storage System

Cited by 29 publications

References 30 publications

The influence of structure and local structural defects on the magnetic properties of cobalt nanofilms

The influence of structure and local structural defects on the magnetic properties of cobalt nanofilms

Dynamic Characteristics of Offshore Natural Gas Hydrate Dissociation by Depressurization in Marine Sediments

Structure and local structural defects influence on the magnetic properties of cobalt nanofilms

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