Cryogenic Material Properties Database

Marquardt, Eric D.; Le, Justin; Radebaugh, Ray

doi:10.1007/0-306-47112-4_84

Cited by 159 publications

(96 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The structural elements of the HTS devices, the inner tube of the vacuum jacketed cryostats, and majority of the cold mass of 2G HTS devices is made of stainless steel and 2G HTS substrate is also made of stainless steel or Hastelloy. In terms of heat capacity, Hastelloy is similar to stainless steel at cryogenic temperature [28,29]. Hence, the analysis assuming that the stainless steel is the cold part mass can be also considered for Hastelloy based structures.…”

Section: Transient Behaviour Of the Integrated Hts System Following Amentioning

confidence: 99%

Coupled Cryogenic Thermal and Electrical Models for Transient Analysis of Superconducting Power Devices with Integrated Cryogenic Systems

Satyanarayana

Indrakanti

Kim

et al. 2017

IOP Conf. Ser.: Mater. Sci. Eng.

View full text Add to dashboard Cite

Abstract. Benefits of an integrated high temperature superconducting (HTS) power system and the associated cryogenic systems on board an electric ship or aircraft are discussed. A versatile modelling methodology developed to assess the cryogenic thermal behavior of the integrated system with multiple HTS devices and the various potential configurations are introduced. The utility and effectiveness of the developed modelling methodology is demonstrated using a case study involving a hypothetical system including an HTS propulsion motor, an HTS generator and an HTS power cable cooled by an integrated cryogenic helium circulation system. Using the methodology, multiple configurations are studied. The required total cooling power and the ability to maintain each HTS device at the required operating temperatures are considered for each configuration and the trade-offs are discussed for each configuration. Transient analysis of temperature evolution in the cryogenic helium circulation loop in case of a system failure is carried out to arrive at the required critical response time. The analysis was also performed for a similar liquid nitrogen circulation for an isobaric condition and the cooling capacity ratio is used to compare the relative merits of the two cryogens. IntroductionHigh Temperature Superconducting (HTS) power devices are attractive for applications that require high power densities such as electric aircrafts and ships [1][2][3][4][5][6][7]. Future all-electric ships and aircrafts will have multiple large electrical loads and the integrated power system to support the loads needs to be flexible to meet the various potential missions. The trend is to reduce the size of aircrafts and ships to increase fuel economy and operational effectiveness [6,8]. The two apparently competing interests are being met with new technologies, integrated power systems, and innovative ship and aircraft designs. The large electrical loads on ships and aircrafts are required only in certain mission scenarios. Hence, power devices with high power densities and variable power ratings that offer tunability would facilitate meeting the design challenges of future all-electric ships and aircrafts. HTS technology has the ability to support the design goals while providing operational flexibility. HTS technology is particularly suitable for direct current (DC) systems and the navy has decided to adapt integrated DC power system for future all-electric ships and aircrafts. HTS materials offer a wide operating temperature window and their current carrying capability varies significantly depending on the cryogenic operating temperature; current density of HTS materials can change up to 10 times by changing the temperature by 40 K. Use of gaseous helium as the cryogen in conjunction with the cryocooler technology allows operating temperatures between 20 and 77 K, giving a large operating temperature window for HTS devices. High

show abstract

Section: Transient Behaviour Of the Integrated Hts System Following Amentioning

confidence: 99%

Coupled Cryogenic Thermal and Electrical Models for Transient Analysis of Superconducting Power Devices with Integrated Cryogenic Systems

Satyanarayana

Indrakanti

Kim

et al. 2017

IOP Conf. Ser.: Mater. Sci. Eng.

View full text Add to dashboard Cite

show abstract

“…The space between the membrane layers is filled with plywood, nuts, and volts, however, the space from the primary membrane layer to the secondary membrane layer is assumed to be filled with steel such that the double membrane layers is reduced to a single stainless steel (SUS304) membrane layer with a thickness of 13.5 mm. The outer and inner hulls supporting the structure of the KC-1 insulation are of 9% nickel steel [17,18]. …”

Section: Problem Definition Description Of Kc-1 Membrane Lng Tankmentioning

confidence: 99%

Calculation of Boil-Off Gas (BOG) Generation of KC-1 Membrane LNG Tank with High Density Rigid Polyurethane Foam by Numerical Analysis

Jeong

Shim

2017

Polish Maritime Research

View full text Add to dashboard Cite

Recently, a new type of LNG tank named "KC-1 membrane LNG tank" has been developed by Korean Gas Corporation (KOGAS), and Samsung Heavy Industries (SHI) is currently building KC-1 membrane type LNG carriers. Unlike other LNG tanks, the KC-1 membrane LNG tank has a single-insulation structure rather than a double-insulation structure. For a given tank's boundary condition, heat transfer analysis is performed from the external to the internal environment of the LNG tank by numerical simulation for three tanks. In each tank, the main thermally resistant layer of insulation is assembled with a High density rigid Polyurethane Foam (H-PUF), which is blown with one of three different types of hydrofluorocarbons-namely-HFC-365mfc, 245fa, and 245fa-e (enhanced). Advantage of such blowing agents is that it has a lower Ozone Depletion Potential (ODP) than HCFC-141b or carbon dioxide ( ) that has been used in the past as well as having low thermal conductivity. A Reduced Order Model is utilized to a 3-dimensional section of the insulation to calculate equivalent thermal conductivity. The equivalent thermal conductivity of the insulation is then applied to the rest of LNG tank, reducing the size of tank simulation domain as well as computation time. Tank's two external and internal boundary conditions used are those defined by the International Code for the Construction and Equipment of Ships Carrying Liquefied Gases in Bulk (IGC) and the United States Coast Guard (USCG) conditions. Boil-off Rate (BOR) of the tank that has the insulation with H-PUF blown with respectively..

show abstract

“…As has been previously discussed, the amount of energy transferred to the copper can be estimated with the pressure drop data. The energy absorbed by the copper is associated with the product of the disk volumetric heat capacity and its temperature changes over time [14]. Similarly, the energy lost radially can be estimated by considering the flange temperature changes and its own volumetric heat capacity, or other simplified assumptions at the flange-He II boundaries.…”

Section: Heat Transfer Analysismentioning

confidence: 99%