Cryogenic Thermal Insulation Systems

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Aerogel Composite Processing Sol-Gel Process catalyst catalyst ← Si(OEt) 4 + nH2O + mEtOH Si(OH) 4 + (m+n) EtOH SiO2 + 2H2O + (m+n) EtOH hydrolysis condensation RADIATION SHIELDING: Aerogels produced in opacified [molecular sieve carbon (MSC)] fiber matrix for inhibition of radiation heat transfer in the infrared range ← Autoclave System
Aerogel Composite Heat Transfer AEROGEL COMPOSITE CONCEPT: Use ultralow density aerogels formed within a fiber matrix to produce a flexible superinsulation CORE OF THE TECHNOLOGY: Aerogels formed at the fiber-fiber contacts force solid heat transfer to occur through the very low thermal conductivity aerogels CRYOGENIC-VACUUM INSULATION: Minimize heat transfer modes by designing insulation system for a given set of operating conditions q = kA ∆T ∆ L k t = k s + k g + k r Total Radiation Solid Conduction Gas Conduction PORE SIZE k s k g k r BULK DENSITY PARTICLE LOADING SURFACE AREA SEM Micrographs of Aerogel/Fiber Composite
Page 1 and 2: Cryogenic Thermal Insulation System
Page 3 and 4: INTRODUCTION
Page 5 and 6: Two things about cryogenics Store
Page 7 and 8: Cryogenics on Earth and in space C
Page 9 and 10: Energy Efficiency on Earth Spacepo
Page 11 and 12: Energy Efficiency for Industry Ind
Page 13 and 14: PART 1 MATERIALS
Page 15 and 16: Basics about Materials Three Basic
Page 17 and 18: New Materials Cabot, aerogel beads
Page 19 and 20: 1. Thermal Conductivity Material t
Page 21 and 22: Representative k-values Material an
Page 23 and 24: Variation of mean heat flux and tot
Page 25 and 26: 3. Density Total installed density
Page 27 and 28: Aerogel Materials LIGHTER THAN AIR?
Page 29: Flexible aerogel composite blanket,
Page 33 and 34: PART 2 TESTING
Page 35 and 36: Comparison of Insulation Test Metho
Page 37 and 38: Cryostat Test Methods Full tempera
Page 39 and 40: Cryostat-1
Page 41 and 42: Cryostat-4
Page 43 and 44: Performance Characterization of Per
Page 45 and 46: Temperatute (K) 350 300 250 200 150
Page 47 and 48: Flow (scm 3 /min) 500 400 300 200 1
Page 49 and 50: Layer temperature profiles as a fun
Page 51 and 52: Main Categories High Vacuum (HV)
Page 53: New Applications Aerogel blankets
Page 56 and 57: There is a hot side and a cold side
Page 58 and 59: Research Testing Conclusion Well o
Page 60 and 61: Selected References Fesmire, J. E.

Cryogenic Thermal Insulation Systems

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