Cryogenic Thermal Insulation Systems

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Comparison of ASTM Methods and New Cryostat Methods Method Type Sample ASTM C518 ASTM C177 ASTM C745 Comparative, Heat Flow Meter Absolute, Guarded Hot Plate Absolute, Boiloff Calorimeter Cryostat-1 Absolute, Boiloff Calorimeter Cryostat-2 Comparative, Boiloff Calorimeter Cryostat-4 Comparative, Boiloff Calorimeter Delta Temp Boundary Temp Range (K) k-value Range (mW/m-K) Flat, square Small 273 to 383 5 to 500 --- Flat, disk Small 93 to 773 14 to 2000 --- Flat, disk Large 250/670 and 20/300 Heat Flux Range (W/m 2 ) --- 0.3 to 30 Cylindrical Large 77 to 300 0.03 to 30 0.8 to 120 Cylindrical Large 77 to 350 0.1 to 50 2 to 400 Flat, disk Large 77 to 350 0.5 to 80 6 to 900
Cryostat Test Methods Full temperature difference (T): Cold-boundary temperature (CBT), 78 K Warm-boundary temperature (WBT), 300 K Temperature difference, 222 K Mean temperature, 189 K Full-range cold vacuum pressure (CVP): High vacuum (HV), below 1×10 -4 torr Soft vacuum (SV), ~1 torr No vacuum (NV), 760 torr Aug 2005 CryoTestLab 37
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 and 30: Flexible aerogel composite blanket,
Page 31 and 32: Aerogel Composite Heat Transfer AER
Page 33 and 34: PART 2 TESTING
Page 35: Comparison of Insulation Test Metho
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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