Demonstration of low temperature radiative cooler for future space missions

Cushman, G. Mark; Mather, John C.; Fixsen, D. J.

doi:10.1063/1.1148438

Cited by 3 publications

(3 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The coil is assumed to be centered at the PRC with a constant separation distance 5 cm from the edges of the winding to the wall. The thickness of the shielding wall is 5 cm, and the density of the shielding wall is about 160 as reported in [7]. The selection of PRC brings facilitates to the acceleration calculation, since the mass of the PRC is approximately proportional to the radius of the coil.…”

Section: Acceleration Achieved By Magnetic Drivingmentioning

confidence: 97%

“…Solving the (4) gets the current in each turn of the coil as: (5) Multiplying the to both sides of the (5) gets the total Ampereturn of the coil as: (6) It is found that the total Ampere-turn which is responsible for generating local fields is independent to the number of the turn but only a function of the coil radius. The field generated by an Helmholtz coil at the center is (7) Substituting (6) to (7) and imposing the background field, we immediately get the field shielded by a single-stage APSC at the center.…”

Section: Acceleration Achieved By Magnetic Drivingmentioning

confidence: 99%

See 1 more Smart Citation

Design of HTS Coil for Magnetic Driving Spacecraft

Zou

et al. 2010

IEEE Trans. Appl. Supercond.

View full text Add to dashboard Cite

An experiment testbed aiming to demonstrate the principle of the magnetic driving (MD) spacecrafts was successfully constructed in 2008. Orthogonal Bi2223 coils provide magnetic fields to attract, repel and rotate two 50 kg vehicles in an air pressured platform. Technique details of the testbed in association with the coil design and fabrication are briefly introduced. More details focused on two conceptual designs, which support the use of MD in the future space missions. First, the acceleration between two vehicles, which is a main parameter to evaluate the efficiency of MD is calculated. An optimal coil radius is obtained for such structure that Bi2223 coils are cooled by a passive radiative cooler whose weight is approximately proportional to the coil radius. Second, an active-passive shielding system (APSS) is proposed to protect the onboard instruments which are sensitive to the magnetic field. The basic unit of the APSS is closed HTS coils, which can resist flux variation. The shielding ability of the APSS is discussed by using both theoretical and Finite Element Analysis.

show abstract

Section: Acceleration Achieved By Magnetic Drivingmentioning

confidence: 97%

Section: Acceleration Achieved By Magnetic Drivingmentioning

confidence: 99%

Design of HTS Coil for Magnetic Driving Spacecraft

Zou

et al. 2010

IEEE Trans. Appl. Supercond.

View full text Add to dashboard Cite

show abstract

“…Surprisingly, little theoretical work has been carried out to support the design and development of precision temperature control devices. 1,19,20 Although formulation of accurate, predictive thermal and system models can be difficult, 5,19 and has led to development of various anecdotal criteria for designing thermal control devices, the potential advantages of formulating such models are significant: ͑i͒ existing devices can be tuned to meet specific performance requirements, ͑ii͒ potential designs can be tested theoretically prior to construction, ͑iii͒ methods for improving device performance can be unambiguously determined and implemented, and ͑iv͒ system behavior can be interpreted and modified or controlled as needed.…”

Section: Introductionmentioning

confidence: 99%

Direct contact packed bed thermal gradient attenuators: Theoretical analysis and experimental observations

Lawton

Patterson

Keanini

2003

Review of Scientific Instruments

View full text Add to dashboard Cite

This article theoretically and experimentally characterizes direct contact, packed bed thermal gradient attenuators in which a fluid control stream, subject to broadband thermal disturbances, flows through a thermally attenuating packed bed medium. The theoretical model decomposes the device into three subsystems: an upper mixing volume, the packed bed, and a lower mixing volume. Analysis of the packed bed subsystem leads to a coupled system of equations that describe local heat transfer within the control stream and within individual spherical elements comprising the packed bed; the system of equations obtained has the same general form as that derived in an earlier investigation of tube-in-shell, noncontact thermal gradient attenuators ͓J. Heat Transfer 123, 796 ͑2001͔͒. Associated subsystem transfer functions are derived, and in analogy with observations reported in the earlier investigation, are shown to provide simple, unambiguous criteria for designing and optimizing packed bed attenuators. It is found that, for 52 different sets of experimental conditions, theoretical performance of the device matches experimental performance to within 2.5 dB root mean square, and that the device provides several orders of magnitude attenuation for flow rates on the order of 1 l/min and disturbance frequencies higher than approximately 10 mHz. The results of the present study and the earlier investigation together provide a useful basis for analyzing and designing large and small, contacting and noncontacting, thermal gradient attenuators.

show abstract

Review of Spacecraft Cryogenic Coolers

Bhatia

2002

Journal of Spacecraft and Rockets

View full text Add to dashboard Cite

Demonstration of low temperature radiative cooler for future space missions

Cited by 3 publications

References 4 publications

Design of HTS Coil for Magnetic Driving Spacecraft

Design of HTS Coil for Magnetic Driving Spacecraft

Direct contact packed bed thermal gradient attenuators: Theoretical analysis and experimental observations

Review of Spacecraft Cryogenic Coolers

Contact Info

Product

Resources

About