Cryogenic Thermal Insulation Systems
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1 Cryogenic Thermal Insulation Systems 16 th Thermal and Fluids Analysis Workshop Orlando, Florida August 9, 2005 James E. Fesmire Stan D. Augustynowicz Cryogenics Test Laboratory NASA Kennedy Space Center Aug 2005 CryoTestLab 1
2 Outline Introduction Part 1, Materials Part 2, Testing Part 3, Applications Conclusion Aug 2005 CryoTestLab 2
3 INTRODUCTION
4 HEAT IS THE ENEMY
5 Two things about cryogenics Store a lot of stuff in a small space Energy density Use the cold temperature to do something useful Refrigeration Space launch and exploration is an energy intensive endeavor; cryogenics is an energy intensive discipline. Aug 2005 CryoTestLab 5
6 Cryogenics now touches on nearly every aspect of modern society Food Health and medicine Energy Transportation Manufacturing Research Aerospace Aug 2005 CryoTestLab 6
7 Cryogenics on Earth and in space Cryogens must be stored, handled, and transferred in safe and effective ways Cryogenic usage and application is being extended to the rest of the world in the first half this century People working in cryogenics are becoming more and more specialized Aug 2005 CryoTestLab 7
8 For progress and efficiency into the 21 st century, high performance thermal insulation systems are needed. Aug 2005 CryoTestLab 8
9 Energy Efficiency on Earth Spaceport facilities Energy integrated launch site Propulsion + Power + Life Support Advanced transfer and storage methods Propellants and gases production Novel components and instrumentation New material applications Thermal insulation structures Cost-efficient storage and transfer of cryogens Aug 2005 CryoTestLab 9
10 Energy Efficiency in Space Space exploration In-space depots Moon base Mars base Other destinations Mass-efficient storage and transfer of cryogens Aug 2005 CryoTestLab 10
11 Energy Efficiency for Industry Industry Hydrogen Transportation Superconducting Power Processes & Applications Aug 2005 CryoTestLab 11
12 Thermal Insulation Systems System Integrated Approach Active + Passive Hot Side + Cold Side Energy and Economics Perspective Performance must justify the cost Save $$ on energy bill Two Things About Insulation Conserve energy (or mass) Provide control of system Aug 2005 CryoTestLab 12
13 PART 1 MATERIALS
14 Background Historical perspective D Arsonval in 1887 to Peterson in 1951 WW II to H2 bomb to Apollo Conventional materials Perlite to multilayer to foam Novel materials Aerogels to sol-gel aerogels Composites old and composites new Aug 2005 CryoTestLab 14
15 Basics about Materials Three Basic Forms Bulk Fill Foams Layered Basic Design Factors Definitions: k-value and CVP Aug 2005 CryoTestLab 15
16 Bulk-Fill Cryogenic Insulation Materials Aug 2005 CryoTestLab 16
17 New Materials Cabot, aerogel beads (Nanogel ) Aspen Aerogels, aerogel blankets (Pyrogel and Spaceloft ) Sordal, polyimide foams (SOLREX ) Inspec Foams, polyimide foams (SOLIMIDE ) TAI, pipe insulation panels NASA, Layered Composite Insulation (LCI) Aug 2005 CryoTestLab 17
18 Performance Price versus performance R5 or R1500, its your (extreme) choice Overall Efficiency, four basic factors: 1. Thermal conductivity 2. Vacuum level ($$$) 3. System density or weight 4. Cost of labor ($$) and materials ($) Aug 2005 CryoTestLab 18
19 1. Thermal Conductivity Material thermal conductivity milliwatt per meter-kelvin [mw/m-k] R-value per inch [hr-ft 2 -degf/btu-in] 1 mw/m-k = R144 Apparent thermal conductivity k-value Real systems with large temperature differences Overall k-value for actual field installation k oafi Often one order of magnitude (or more!) higher than reported ideal or laboratory k-values Aug 2005 CryoTestLab 19
20 Thermal Insulating Performance of Various Materials MLI System at HV LCI System at HV Aerogel Beads at HV LCI System at SV MLI System at SV Aerogel Composite Blanket Polyurethane Foam Fiberglass Cork Oak Board Ice Whale Blubber Concrete Stainless Steel Pure Copper Thermal Conductivity (milliwatt per meter-kelvin)
21 Representative k-values Material and Density HV SV NV <10-4 torr 1 torr 760 torr Vacuum, polished surfaces 0.5 to 5 Nitrogen gas at 200 K 18.7 Fiberglass, 16 kg/m PU foam, 32 kg/m 3 21 Cellular glass foam, 128 kg/m 3 33 Perlite powder, 128 kg/m Aerogel beads, 80 kg/m Aerogel composite blanket, 125 kg/m MLI, foil and paper, 60 layers, 79 kg/m ~24 New! LCI, 30 layers, 78 kg/m Boundary temperatures of approx. 293 K and 77 K; residual gas is nitrogen; k-value in mw/m-k.
22 Variation of k-value with cold vacuum pressure for glass bubbles in comparison with perlite powder and aerogel beads. Boundary temperatures are approximately 293 K and 77 K. Residual gas is nitrogen. Apparent Thermal Conductivity k-value (mw/m-k) Glass Bubbles, C137 Perlite Powder, 9 pcf Aerogel Beads, C Cold Vacuum Pressure CVP (millitorr)
23 Variation of mean heat flux and total heat transfer with cold vacuum pressure for glass bubbles. Boundary temperatures are approximately 293 K and 77 K. Residual gas is nitrogen. Heat Flux (W/m2) and Total Heat (W) H eat Flux, C 137 Total Heat, C Cold Vacuum Pressure CVP (millitorr)
24 2. Vacuum Level System operating environment is Cold Vacuum Pressure (CVP) High Vacuum (HV), below 10-4 torr Soft Vacuum (SV), from 1 to 10 torr No Vacuum (NV), 760 torr CVP is the first system design question and the primary cost driver for most applications Aug 2005 CryoTestLab 24
25 3. Density Total installed density (or weight) is often critical for transportation applications Density, as related to thermal mass, is also important for control of process systems Aug 2005 CryoTestLab 25
26 4. Cost Performance must justify the cost Total heat flow, through insulation and all other sources, determines thermal performance requirements Manufacturing, maintenance, and reliability considerations are the key for determining overall cost Aug 2005 CryoTestLab 26
27 Aerogel Materials LIGHTER THAN AIR?
28 Aerogel Basics World s lightest solid Lighter is not always better Special class of open-pore structure nano-materials Extremely low density (as low as several mg/cm 3 ) High porosity (up to 99%) High surface area (over 1000 m 2 /g) Ultrafine pore size (as small as 2-nm radius) Derived from the supercritical drying of highly crosslinked inorganic or organic gels Sol-Gel processing methods Aug 2005 CryoTestLab 28
29 Flexible aerogel composite blanket, R&D 2003 Award winner, Aspen Aerogels and NASA-KSC Commercial products, Aspen Aerogels, Inc.
30 Aerogel Composite Processing Sol-Gel Process catalyst catalyst Si(OEt) 4 + nh 2 O + metoh Si(OH) 4 + (m+n) EtOH SiO 2 + 2H 2 O + (m+n) EtOH hydrolysis condensation Autoclave System RADIATION SHIELDING: Aerogels produced in opacified [molecular sieve carbon (MSC)] fiber matrix for inhibition of radiation heat transfer in the infrared range
31 Aerogel Composite Heat Transfer k s BULK DENSITY AEROGEL COMPOSITE CONCEPT: Use ultralow density aerogels formed within a fiber matrix to produce a flexible superinsulation PORE SIZE k g k r PARTICLE LOADING SURFACE AREA 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 Solid Conduction Gas Conduction Radiation SEM Micrographs of Aerogel/Fiber Composite
32 Aerogel Beads Production Large-scale production by Cabot Corp. in 2003 Economical precursor: sodium silicate Bead formation using high throughput spray nozzle Aerogel produced by low cost process with ambient pressure drying step Waterglass Sol Hydrogel Silation Aerogel
33 PART 2 TESTING
34 Experimental Research Testing Heat transfer through insulation materials must be understood by testing under actual-use, cryogenic-vacuum conditions Test methods and equipment Understanding test results Analysis and modeling Performance comparison of different materials Aug 2005 CryoTestLab 34
35 Comparison of Insulation Test Methods Cryostats use steady-state liquid nitrogen boiloff calorimeter methods Different methods and devices are complementary and necessary New Cryostat methods provide practical capability for testing real systems Full temperature difference Full-range vacuum conditions Aug 2005 CryoTestLab 35
36 Comparison of ASTM Methods and New Cryostat Methods Method Type Sample Delta Temp Boundary Temp Range (K) k-value Range (mw/m-k) Heat Flux Range (W/m 2 ) ASTM C518 ASTM C177 Comparative, Heat Flow Meter Absolute, Guarded Hot Plate Flat, square Small 273 to to Flat, disk Small 93 to to ASTM C745 Absolute, Boiloff Calorimeter Flat, disk Large 250/670 and 20/ to 30 Cryostat-1 Absolute, Boiloff Calorimeter Cryostat-2 Comparative, Boiloff Calorimeter Cryostat-4 Comparative, Boiloff Calorimeter Cylindrical Large 77 to to to 120 Cylindrical Large 77 to to 50 2 to 400 Flat, disk Large 77 to to 80 6 to 900
37 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 torr Soft vacuum (SV), ~1 torr No vacuum (NV), 760 torr Aug 2005 CryoTestLab 37
38 Description of Cryostats Cryostat-1 and Cryostat-100 Cold mass 167 mm dia. by 900 mm length Test specimens up to 50 mm thickness Cryostat-2 Cold mass 132 mm dia. by 500 mm length Test specimens up to 50 mm thickness Cryostat-4 Test specimens 200 mm dia. by up to 30 mm thickness Compressive load measurement (optional) Aug 2005 CryoTestLab 38
39 Cryostat-1
40 Cryostat-2
41 Cryostat-4
42 Example Test Series Cryostat-1
43 Performance Characterization of Perforated MLI Blankets Perforated multilayer insulation (MLI) blanket systems are targeted for large-scale cryogenic facilities. Space applications and particle accelerators are two fields concerned with thermal shielding of cryogenic devices. Because radiation heat transfer varies with T 4, heat transfer in the range of 300K to 77K is dominant even for devices operating at temperatures as low as 2K. Systems operating under conditions of degraded vacuum levels are also a key consideration because of heat transfer by residual gas conduction. The results of an experimental study of a perforated MLI blanket system using a steady-state liquid nitrogen evaporation method are presented.
44 Experimental apparatus
45 350 Temperature and CVP Profiles C135, 30 layers Jehier, 0.01µ Test 1, Run 1, 09/04/01 RT D1 RT D2 RT D3 RT D5 RT D6 RT D7 RT D8 RT D9 RT D10 RT D11 RT D12 RT D13 RT D14 RT D15 RT D16 TC1 TC2 TC3 TC4 TC5 TC6 TC7 TC8 CVP Temperatute (K) 200 CVP (microns) time (h) 0.01
46 Pressure (psig) Liquid Nitrogen Pressures C135, 30 layers Jehier, 0.01m Test 1, Run 1, 09/04/01 dp = P4 - P6 P3, Manifold P5, Lower P4, Upper P6, Test time (h)
47 500 Measurements of Boil-off and k-value C135, 30 layers Jehier, 0.01m Test 1, Run 1, 09/04/01 Flow 0.3 k Flow (scm 3 /min) Apparent Thermal Conductivity k (mw/m-k time (h)
48 Variation of k-value with cold vacuum pressure for different MLI 100 Apparent Thermal Conductivity (mw/m-k Kaganer, MLI C108, 40 layers MLI C123, 60 layers MLI C135, Perforated MLI Blanket Cold Vacuum Pressure (millitorr)
49 Layer temperature profiles as a function of blanket thickness 310 Layer 30, WBT 270 Layer 20 Layer Layer 10 Temperature (K) Layer 2 Layer millitorr, Test millitorr, Test millitorr, Test millitorr, Test 2 1 millitorr, Test 3 5 millitorr, Test 9 10 millitorr, Test millitorr, Test millitorr, Test 6 Layer millitorr, Test Layer 0, CBT Thickness (mm)
50 PART 3 APPLICATIONS
51 Main Categories High Vacuum (HV) MLI or SI, microfiberglass, fine perlite, LCI, vacuum panels, aerogels Soft Vacuum (SV) Aerogels, LCI, vacuum panels No Vacuum (NV) Foams, cellular glass, fiberglass, aerogels Aug 2005 CryoTestLab 51
52 Examples HV: LH2 storage tank, Fuel cell tanks, MLI blanket for Large Hadron Collider (LHC) SV: Piping connections, Mars surface storage NV: Shuttle External Tank, LO2 storage tank Aug 2005 CryoTestLab 52
53 New Applications Aerogel blankets for next-generation launch vehicle thermal protection Aerogel beads for cold box and non-vacuum applications Layered Composite Insulation (LCI), world s lowest k-value system at soft vacuum level Glass microspheres for cryogenic tanks and structural applications Reusable polyimide foams for cryogenic tanks Aug 2005 CryoTestLab 53
54
55 CONCLUSION
56 There is a hot side and a cold side The energy WILL balance. We want to make it balance to our best advantage. Aug 2005 CryoTestLab 56
57 Materials Tested Multilayer insulation (MLI), various types Aluminum foil and fiberglass paper Polyester nonwovens Polyurethane foam Aerogel powder Aerogel beads Aerogel blankets Glass microspheres Polyimide microspheres Polyimide foams Layered composite insulation (LCI) Aluminized Mylar and polyester fabric Syntactic foam composites Micro fiberglass Perlite powder Modular cryogenic insulation (MCI) Various composite insulation systems Polystyrene And many others! Aug 2005 CryoTestLab 57
58 Research Testing Conclusion Well over 1000 cryogenic thermal performance tests of over 100 different thermal insulation systems have been produced by the CryoTestLab at NASA Kennedy Space Center Specific insulation systems must be optimized for best performance (such as lowest k-value and bulk density) under different vacuum levels All modes of heat transfer (radiation, solid conduction, gas conduction, and convection) must be addressed Aug 2005 CryoTestLab 58
59 Significance and Impact Invented new test equipment and methods for thermal performance characterization of insulation systems New standard for testing under actual-use, cryogenic-vacuum conditions Partnered in development of new products now on the market Aerogel composite blanket (Aspen Systems) Python vacuum-insulated piping (Chart-MVE) Aerogel beads for thermal insulation (Cabot) Aug 2005 CryoTestLab 59
60 Selected References Fesmire, J. E. and Augustynowicz, S.D., Improved Thermal-Insulation for Low Temperatures, NASA Tech Briefs, September 2003, pp Fesmire, J.E., Augustynowicz, S.D., Heckle, K.W., and Scholtens, B.N., Equipment and Methods for Cryogenic Thermal Insulation Testing, Cryogenic Engineering Conference, Fesmire, J.E., and Augustynowicz, S.D, Thermal Performance Testing of Glass Microspheres under Cryogenic-Vacuum Conditions, Cryogenic Engineering Conference, Williams, M., Fesmire, J., Weiser, E., and Augustynowicz, S., Thermal Conductivity of High Performance Polyimide Foams, Cold Facts, Cryogenic Society of America, Spring Fesmire, J. E., Augustynowicz, S.D., and Darve, C., Performance Characterization of Perforated MLI Blanket, Proceedings of the Nineteenth International Cryogenic Engineering Conference, ICEC 19, Narosa Publishing House, New Delhi, 2003, pp Fesmire, J.E., Augustynowicz, S.D., and Rouanet, S., Aerogel Beads as Cryogenic Thermal Insulation System, in Advances in Cryogenic Engineering, Vol. 47, American Institute of Physics, New York, 2002, pp Fesmire, J.E., Augustynowicz, S.D. and Demko, J.A., Thermal Insulation Performance of Flexible Piping for Use in HTS Power Cables, in Advances in Cryogenic Engineering, Vol. 47, American Institute of Physics, New York, 2002, pp Augustynowicz, S.D. and Fesmire, J.E., Cryogenic Insulation System for Soft Vacuum, in Advances in Cryogenic Engineering, Vol. 45, Kluwer Academic/Plenum Publishers, New York, 2000, pp Augustynowicz, S.D., Fesmire, J.E., and Wikstrom, J.P., Cryogenic Insulation Systems, in 20 th International Congress of Refrigeration Sydney, no , International Institute of Refrigeration, Paris, Fesmire, J.E., Rouanet, S., and Ryu, J., Aerogel-Based Cryogenic Superinsulation, in Advances in Cryogenic Engineering, Vol. 44, Plenum Press, New York, 1998, pp
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