The calculation principle is shown in Fig. 1, where P 1, P 2, P 3 represent the pressure of interior medium in the hydrogen storage container, leakage location, and the equivalent outlet, Pa; T 1 ...
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To explore the temperature distri- bution and heat flux of the cold insulation layer at various parts of the tank, different calculation methods are used, considering three heat transfer …
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A numerical simulation method by using the realizable k-ε model of computational fluid dynamics (CFD) proposed by establishing the model of hydrogen leakage of a high-pressure ...
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In this paper, the heat dissipation behavior of the thermal management system of the container energy storage system is investigated based on the fluid dynamics simulation method. The results of the effort show that poor airflow organization of the cooling air is a significant influencing factor leading to uneven internal cell temperatures.
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The methodology is divided into four steps covering: (a) description of the thermal process or application, (b) definition of the specifications to be met by the TES …
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PDF | In this paper, the leakage and diffusion of liquefied hydrogen which is stored in high-pressure container were ... Storage Technology. Energy Cons ervation & Environmental Protection, 2(2010 ...
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Abstract. To investigate the evolution process of LNG (Liquefied Natural Gas) liquid pool and gas cloud diffusion, the Realizable k - ε model and Eluerian model …
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To illustrate the influences of heat leakage, heat leakage is set to 10 W, 20 W, 40 W and 80 W in the four cases. The initial pressure, initial filling rate, terminated moment, initial superheated degree ( Δ T u ) and initial subcooled degree ( Δ T l ) are set to 0.1 MPa, 50%, 100,000 s, 0.1 K and 0.1 K, respectively.
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Efficient insulation technology is one of the key technologies for the development of large LH2 storage tanks. This paper aimed at a 4000 m3 LH2 spherical tank, many insulation schemes were designed, including multilayer insulation systems integrated with a vapor-cooled shield (VCS) and liquid-nitrogen-cooled shield (LN2CS). …
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ecommended for the storage of cryogenic fluids such as nitrogen (LN2) and hydrogen (LH2). Indeed, heat leakage of 50 to 150 W occurs for an i. sulation layer varying from 0.55 to 1 m thick in a cylindrical tank with a length of 2 m. Nonetheless, it would possible to consider LNG product storage such as liquid p.
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1.1 Methods for thermal energy storage 5 absorb water from the atmosphere and the heat of solution and the heat of conden-sation are released (fig.1.4). While absorbing water the salt solution is diluted. In a second step, the water can be released (desorbed
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Heat leakage into cryogenic vessels is a major parameter to reflect the thermal insulation performance as calculated by the loss product of a percentage in standard. If the loss product is tested at low liquid levels for a cryogenic vessel, considerable medium and time will be saved in the test process. However, heat leakages typically …
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The fitted curve in Fig. 13 is plotted from the experimental data of Exp #1 in the range of 0 s–25,000 s, and it is used as a reference to determine the validity of various methods in pressure rise simulation from 0 s to 50,000 s.As shown in Fig. 13, adopting a uniform heat flux as the boundary condition of TMZM overestimates pressure rise, …
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Yan et al. [25] established a rupture leakage mathematical model of natural gas pipeline, and solved the pressure and leakage flow in the process of pipeline leakage by analytical method. Based on the model of overhead pipelines, some scholars have studied the gas leakage from buried pipelines.
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Heat leakage from cryogenic vessels is an important parameter of thermal insulation performance reflected by product loss in the standard method. Current standards require the cryogenic vessel to be full before testing, which wastes a considerable amount of working medium. If product loss is tested at another liquid level, especially at a low liquid …
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Latent heat thermal energy storage (LHTES) affords superior thermal energy capacity and compactness but has limited applications due to the low thermal conductivity of phase change materials (PCMs). Several researches have focused on the improvement of heat transfer and reducing the total melting time of PCMs in LHTES …
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In this paper, the heat dissipation behavior of the thermal management system of the container energy storage system is investigated based on the fluid …
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Guo et al. [ 19] studied different types of containers, namely, shell-and-tube, encapsulated, direct contact and detachable and sorptive type, for mobile thermal energy storage applications. In shell-and-tube type container, heat transfer fluid passes through tube side, whereas shell side contains the PCM.
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Owing to the heat leak from the thermal environment, temperature stratifications always exist in the liquefied gas tanks. It affects the temperature distribution and energy storage of the liquid and the pressure rising in the vapor phase, and consequently will have a direct impact on the safety of the tank [10], [11], [12].
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For a kind of LNG storage tank,the heat transfer of concrete outer wall was analyzed with the finite element method(FEM)during the leakage of primary container.The temperature change of outer tank wall in different time in beginning of leakage,the temperature distribution and heat flux of outer tank wall when leakage develops and the effect of …
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The leakage accident is analyzed with respect to leakage sizes, leak directions, and the time to stop the leakage. It is found that, due to the large mass flow rate under such high pressure, the leak direction and the layout of the components inside the dispenser become insignificant, and the ignitable clouds will form inside the dispenser in …
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Considering the influence of the above factors, the variation of total gas mass in containment can be calculated by the following formula: Δm Δt = Qleak + Qp + Qsar. (1) Δ m Δ t = Q l e a k + Q p + Q s a r. ( 1) Let the average daily leakage rate Q ld = Q leak + Q p, and then we can get the formula: Qld = Δm Δt −Qsar.
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Leakage incidents on LNG bunker vessels will result in a serious degree of hazard. This paper investigates typical high-risk scenarios such as hose ruptures and valve joint leakages. The consequences of an LNG leakage accident during the simultaneous operation of a bunker vessel and a container carrier are simulated using the FLACS …
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Here, the unique hazard of the BESS is the electrical and chemical energy contained within the batteries themselves. Rapid and uncontrolled release of this energy may occur if the battery undergoes thermal runaway. Hence, the top event in the BESS bowtie analysis is thermal runaway.
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In this paper, a method is introduce to estimate the heat insu-lated performance of the LNG container based on analysis of heat transfer process in running of buses, which is …
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In the assumed case, depending on the ambient temperature. values of boil off rate range from 0.0177-0.0193% vol/day at an ambient temperature of. 260K to 0.0228-0.0246% vol/day for an ambient ...
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Through the analysis of the cooling structure and heat exchange process of LNG storage tanks, a calculation method for heat leakage and daily evaporation rate of large LNG storage tanks is given, and the influence of solar radiation on the heat leakage of storage tanks is comprehensively considered.
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Thermal energy storage is inevitable for effective use of renewable energy sources due to their intermittent nature, particularly solar energy, which is the most prospective energy source. Thermal energy storage plays a vital role in bridging the gap between energy supply and its demand, which in turn, improves the performance and …
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2) Heat leak through piping connections, penetrations, and feedthroughs (Q p) 3) Insulation Quality Factor or IQF (Q IQF) a. Heat leak due to practical constraints of fabrication, installation, and assembly of the insulation system on the cold mass b. Heat leak c.
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