Measurement of boiling heat transfer coefficient in liquid nitrogen bath by inverse heat conduction method

Jin, Tao; Hong, Jian-ping; Zheng, Hao; Tang, Ke; Gan, Z.H.

doi:10.1631/jzus.a0820540

Cited by 65 publications

(23 citation statements)

References 5 publications

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“…Nitrogen vapor rises to the condenser in a concentric 25-mm tube, the adiabatic region of the thermosiphon. The evaporator area of 0.0108 m 2 was chosen to support a 60-W boiling rate, assuming complete immersion and a heat flux rate of 6200 W/m 2 , the film boiling minimum in a similar system [28]. An external nitrogen reservoir, held at room temperature, is connected to the condenser by a spiral tube with low thermal conductance.…”

Section: Cooling Systemmentioning

confidence: 99%

Focal-plane detector system for the KATRIN experiment

Amsbaugh

Barrett

Beglarian

et al. 2015

Nuclear Instruments and Methods in Physics Research Section A:

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The focal-plane detector system for the KArlsruhe TRItium Neutrino (KATRIN) experiment consists of a multi-pixel silicon p-i-n-diode array, custom readout electronics, two superconducting solenoid magnets, an ultra high-vacuum system, a high-vacuum system, calibration and monitoring devices, a scintillating veto, and a custom data-acquisition system. It is designed to detect the low-energy electrons selected by the KATRIN main spectrometer. We describe the system and summarize its performance after its final installation.Comment: 28 pages. Two figures revised for clarity. Final version published in Nucl. Inst. Meth.

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Section: Cooling Systemmentioning

confidence: 99%

Focal-plane detector system for the KATRIN experiment

Amsbaugh

Barrett

Beglarian

et al. 2015

Nuclear Instruments and Methods in Physics Research Section A:

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“…It represents the key factor in the recovery period which means returning to superconducting state after the quench. To consider the impact of the recovery period, the heat coefficient equations were taken from [11] as a function of the temperature rise. The assumption here is that the whole HTS windings are fully covered by liquid nitrogen during the quench process.…”

Section: Modelling Sfclt'smentioning

confidence: 99%

Effectiveness of Superconducting Fault Current Limiting Transformers in Power Systems

Elshiekh

Zhang

Ravindra

et al. 2018

IEEE Trans. Appl. Supercond.

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Abstract-Superconducting devices have emerged in many applications during the last few decades. They offer many advantages including high efficiency, compact size, and superior performance. However, the main drawback of these devices is the high cost. An option to reduce the high cost and improve the costbenefit ratio is to integrate two functions into one device. This paper presents the superconducting fault current limiting transformer (SFCLT) as a superior alternative to normal power transformers. The transformer has superconducting windings and also provides fault current limiting capability to reduce high fault currents. The SFCLT is tested in two power system models: a 7 bus wind farm based model simulated in PSCAD and on the 80 bus simplified Australian power system model simulated in RTDS. Various conditions were studied to investigate the effectiveness of the fault current limiting transformer.  Index Terms-Transformers, superconducting, fault current limiters .

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“…The concept of filling the annulus space with LN2 to achieve maximum cooling is also supported by the analysis of test data for the 9-mm room-temperature and cold-fill test cases. The bounding limit data plotted in Figure 3.8 is digitized data from Jin et al (2009), which is from full-immersion tests. The idea is that full immersion in LN2 offers the greatest possible surface heat transfer and so forms a natural limit of cooling rate.…”

Section: Data Analysis  Test Of Ln2 Cooled-wall Type-i Prototype Tankmentioning

confidence: 99%

PNNL Development and Analysis of Material-Based Hydrogen Storage Systems for the Hydrogen Storage Engineering Center of Excellence

Brooks

Alvine

Johnson

et al. 2016

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The Hydrogen Storage Engineering Center of Excellence is a team of universities, industrial corporations, and federal laboratories with the mandate to develop lower-pressure, materials-based, hydrogen storage systems for hydrogen fuel cell light-duty vehicles. Although not engaged in the development of new hydrogen storage materials themselves, it is an engineering center that addresses engineering challenges associated with the currently available hydrogen storage materials. Three material-based approaches to hydrogen storage are being researched: 1) chemical hydrogen storage materials 2) cryo-adsorbents, and 3) metal hydrides. The U.S. Department of Energy through its USDRIVE program has established storage system targets to ensure that light-duty vehicles using these technologies have driving ranges comparable to currently available vehicles while meeting commercial performance, cost, and reliability requirements. Specific target values are provided for specific years to help guide the system development. The targets include gravimetric and volumetric density, cost, operating temperatures and pressures, charging and discharging rates, transient behavior, and safety. As a member of this Center, Pacific Northwest National Laboratory (PNNL) has been involved in the design and evaluation of systems developed with each of these three hydrogen storage materials. The scope of PNNL's efforts in the development of chemical hydrogen storage materials includes the following five major tasks as delineated below:  Develop storage system designs that are amenable to vehicle applications. The goal of these storage systems is to meet the DOE Technical Targets for light-duty vehicles.  Collect the key properties of the storage materials that are required to develop these system designs. Such things as thermodynamic characteristics, reaction kinetics, and transport properties were measured.  Develop models that predict the system's performance in a vehicle and allow the storage system to be appropriately sized to meet a set of drive cycles.  Perform experimental work to guide the system design of individual components and ultimately validate the storage system models.  Develop system costs for production ranges between 10,000 and 500,000 units for the most viable systems developed. The cost estimates were developed using both top-down and a bottom-up approaches. Work on chemical hydrogen storage materials was performed in both Phase I and Phase II. DOE determined not to continue work with chemical hydrogen storage materials in Phase III. The PNNL Phase-I work focused on the development of a storage system using solid ammonia borane as the storage material in the form of a powder or pellet. The PNNL Phase-II work focused on development of a chemical hydrogen storage material using slurry material. Rather than focusing only on slurry forms of ammonia borane, it included the evaluation of a slurry form of alane as well. Both phases included development of system designs, measurements of key properties, model development, vali...

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Measurement of boiling heat transfer coefficient in liquid nitrogen bath by inverse heat conduction method

Cited by 65 publications

References 5 publications

Focal-plane detector system for the KATRIN experiment

Focal-plane detector system for the KATRIN experiment

Effectiveness of Superconducting Fault Current Limiting Transformers in Power Systems

PNNL Development and Analysis of Material-Based Hydrogen Storage Systems for the Hydrogen Storage Engineering Center of Excellence

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