Integrated and Load Responsive Multilayer Insulation

Dye, Scott; Kopelove, A.; Mills, Gary L.; Weisend, J. G.

doi:10.1063/1.3422464

Cited by 18 publications

(10 citation statements)

References 1 publication

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“…The basis for the structural insulation system was the Integrated Multilayer Insulation (IMLI) and Load-Responsive Multilayer Insulation (LR-MLI) developed by Quest Thermal Group and Ball Aerospace and Technology Corporation in cooperation with NASA. 10 This new insulation called Load-Bearing Multilayer Insulation (LB-MLI) uses discrete spacers between each layer to increase the conduction length and subsequent thermal resistance between the tank and the shield. The refrigeration shield was mounted using epoxied velcro to the LB-MLI, which was mounted onto Spray on Foam Insulation (SOFI) that was sprayed onto the tank using epoxied velcro.…”

Section: A Reduced Boil-off Conceptmentioning

confidence: 99%

Tank Applied Testing of Load-Bearing Multilayer Insulation (LB-MLI)

Johnson

Valenzuela

Feller

et al. 2014

50th AIAA/ASME/SAE/ASEE Joint Propulsion Conference

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The development of long duration orbital cryogenic storage systems will require the reduction of heat loads into the storage tank. In the case of liquid hydrogen, complete elimination of the heat load at 20 K is currently impractical due to the limitations in lift available on flight cryocoolers. In order to reduce the heat load, without having to remove heat at 20 K, the concept of Reduced Boil-Off uses cooled shields within the insulation system at approximately 90 K. The development of Load-Bearing Multilayer Insulation (LB-MLI) allowed the 90 K shield with tubing and cryocooler attachments to be suspended within the MLI and still be structurally stable. Coupon testing, both thermal and structural was performed to verify that the LB-MLI should work at the tank applied level. Then tank applied thermal and structural (acoustic) testing was performed to demonstrate the functionality of the LB-MLI as a structural insulation system. The LB-MLI showed no degradation of thermal performance due to the acoustic testing and showed excellent thermal performance when integrated with a 90 K class cryocooler on a liquid hydrogen tank.

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Section: A Reduced Boil-off Conceptmentioning

confidence: 99%

Tank Applied Testing of Load-Bearing Multilayer Insulation (LB-MLI)

Johnson

Valenzuela

Feller

et al. 2014

50th AIAA/ASME/SAE/ASEE Joint Propulsion Conference

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“…Next generation insulation IMLI uses low thermal conductance polymer micromolded spacers between radiation shield layers Ref. [3]. IMLI systems show a measured heat leak of 0.41 W/m 2 (20 layers, 3.7 cm, 77-293°K) Ref.…”

Section: Introductionmentioning

confidence: 99%

Wrapped multilayer insulation design and testing

Dye

Tyler

Mills³

et al. 2014

Cryogenics

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“…The Cryogenic Test Laboratory at Kennedy Space Center has performed independent testing using liquid nitrogen calorimetry to characterize the performance of IMLI. A 20-layer blanket had a measured performance of 0.41 W/m 2 (0.0069 mW/m-K) which is approximately 40% lower heat leak per layer than typical netting spacer MLI [2].…”

Section: Discrete Spacer Technologymentioning

confidence: 99%

Wrapped multilayer insulation for cryogenic piping

Dye¹,

Kopelove²,

Mills³

2012

AIP Conference Proceedings

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Many cryogenic systems require thermal insulation on piping and tubing containing cryogenic fluids. The lowest heat leak is typically achieved with conventional multilayer insulation (MLI) wrapped around the tubing and contained in a vacuum. However, because of inherent insulation compression and its effect on conventional netting spacer MLI, MLI performance on piping and tubing is four to ten times worse than MLI on a cryogenic tank or flat surface. Wrapped Multilayer Insulation (WMLI) is a high performance multilayer insulation designed for cryogenic piping that uses an innovative discrete spacer technology to control layer spacing/density and reduce heat leak. This paper reports on the initial development of WMLI and its demonstration as a feasible technology. The WMLI design was estimated in thermal models to provide four times better thermal insulation than conventional MLI on cryogenic piping. A WMLI prototype was built and had a measured heat leak 37% of the heat leak of conventional MLI insulating tubing. Test results for WMLI are presented, and plans for continued development of this insulation are discussed.

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Integrated and Load Responsive Multilayer Insulation

Cited by 18 publications

References 1 publication

Tank Applied Testing of Load-Bearing Multilayer Insulation (LB-MLI)

Tank Applied Testing of Load-Bearing Multilayer Insulation (LB-MLI)

Wrapped multilayer insulation design and testing

Wrapped multilayer insulation for cryogenic piping

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