Evaluation of Thermal Insulation Performance of a New Multi-Layer Insulation with Non-Interlayer-Contact Spacer

Date

2015-07-12

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Publisher

45th International Conference on Environmental Systems

Abstract

Efficient insulation for tanks of the cryogenic propulsion stage or for infrared astronomical satellites is one of the crucial key requirements. Multi-layer insulation (MLI) blankets are used for spacecraft as excellent insulations. For conventional MLI blankets using net spacers or embossed films however, it is difficult to control the layer density and the thermal insulation performance degrades due to the increase in conductive heat leak through interlayer contacts. At low temperatures, the proportion of conductive heat transfer through MLI blankets is large compared to that of radiative heat transfer, hence the decline in thermal insulation performance is significant. A new type of MLI blanket using new spacers; the Non-Interlayer-Contact Spacer MLI (NICS MLI) has been developed, which uses small discrete spacers and can exclude uncertain interlayer contact between films. The insulation performance is measured with a boil-off calorimeter. Because the NICS MLI blanket can exclude uncertain interlayer contact, the test results correlated well to estimations. Furthermore, the NICS MLI blanket shows significantly good insulation performance (effective emissivity is 0.0008 between 300K and 77K boundary temperature), particularly at low temperatures, due to the high thermal resistance of this spacer.

Description

Bellevue, Washington
Takeshi Miyakita, Japan Aerospace Exploration Agency, Japan
Ryuta Hatakenaka, Japan Aerospace Exploration Agency, Japan
Hiroyuki Sugita, Japan Aerospace Exploration Agency, Japan
Masanori Saitoh, Orbital Engineering Inc., Japan
Tomoyuki Hirai, Toska-Bano’k Co., Ltd., Japan
The 45th International Conference on Environmental Systems was held in Bellevue, Washington, USA on 12 July 2015 through 16 July 2015.

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