A calorimeter for multilayer insulation (MLI) performance measurements at variable temperature

Celik, D.; Hurd, J.; Klimas, Richard John; Sciver, S.W. Van

doi:10.1016/j.cryogenics.2013.03.001

Cited by 12 publications

(7 citation statements)

References 7 publications

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“…MIKE has been shown to have an uncertainty in measurements of 1.4% in the operating temperature range of ~60K, with more detail available in [4]. Additionally, the steady state temperatures of the hot and cold boundary conditions were very nearly isothermal, as discussed above.…”

Section: Fsu Experimental Error Analysis and Conclusionmentioning

confidence: 78%

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Experimental performance of MLI blanket density and compression effects for use in GE MRI cryostat design

Pienkos¹,

Vansciver²,

Çelik³

et al. 2014

AIP Conference Proceedings

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Abstract. Multilayer Insulation (MLI) blankets for MRI cryostats were experimentally tested and modeled. These blankets were tested using a high accuracy experimental apparatus that allows for set temperature boundary conditions that are not linked to liquid cryogen temperatures. Additional testing was also done on blanket performance when compressed. The experimental data was modeled and the results show good agreement. The model uses only design parameters to determine the thermal performance of the blanket. Using this model, a new blanket was designed, tested, and implemented in production.

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Section: Fsu Experimental Error Analysis and Conclusionmentioning

confidence: 78%

“…The heat flux of the insulated cylinder, which is therefore the radiation load, is then measured using a rod with temperature sensors along the length. For greater detail on MIkE or the accuracy, please refer to [4]. …”

Section: Apparatus Descriptionmentioning

confidence: 99%

Experimental performance of MLI blanket density and compression effects for use in GE MRI cryostat design

Pienkos¹,

Vansciver²,

Çelik³

et al. 2014

AIP Conference Proceedings

Self Cite

View full text Add to dashboard Cite

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“…Once θ is known, the heat load can be calculated by measuring the temperature difference and multiplying the measured value by θ. This process is similar to calculating electrical current through a known resistor after measuring the voltage drop across it [1].…”

Section: Testing Proceduresmentioning

confidence: 99%

“…The samples of load bearing MLI (LB-MLI) were produced by the Quest Thermal group and supplied by NASA Kennedy Space Center [1]. The layer density is roughly 5 layers per centimeter.…”

Section: Introductonmentioning

confidence: 99%

Measurements of the apparent thermal conductivity of multi-layer insulation between 20 K and 90 K

Hurd¹,

Sciver²

2014

AIP Conference Proceedings

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“…The heat load can then be normalized to the logarithmic mean surface area and converted to heat flux. Additionally, FSU recently developed the Multilayer Insulation Calorimetry Experiment (MIKE) using cryocoolers [13]. MIKE can perform testing with a cold boundary temperature of 20 K and a warm boundary temperature of 90 K, which is the actual conditions expected for this application.…”

Section: Experimentationmentioning

confidence: 99%

Thermal coupon testing of Load-Bearing Multilayer Insulation

Johnson¹,

Heckle²,

Hurd³

2014

AIP Conference Proceedings

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Abstract. Advanced liquid hydrogen storage concepts being considered for long duration space travel incorporate refrigeration systems and cryocoolers to lower the heat load. Using a refrigeration loop to intercept the energy flowing through MLI to a liquid hydrogen tank at a temperature between the environment and the liquid hydrogen can lower the heat load on the propellant system by as much as 50%. However, the refrigeration loop requires structural integration into the MLI. Use of a more traditional concept of MLI underneath this refrigeration loop requires that a structural system be put in place to support the loop. Such structures, even when thermally optimized, present a relatively large parasitic heat load into the tank. Through NASA small business innovation research funding, Quest Thermal Group and Ball Aerospace have been developing a structural MLI based insulation system. These systems are designed with discrete polymeric spacers between reflective layers instead of either dacron or silk netting. The spacers (or posts) have an intrinsic structural capability that is beyond that of just supporting the internal insulation mechanical loads. This new MLI variant called Load Bearing MLI (LB-MLI) has been developed specifically for the application of supporting thermal shields within the insulation system. Test articles (coupons) of the new LB-MLI product were fabricated for thermal performance testing using liquid nitrogen at Kennedy Space Center (KSC) and using cryocooler based calorimetry at Florida State University. The test results and analysis are presented. Thermal models developed for correlation with the thermal testing results both at KSC and testing that was performed at Florida State University are also discussed.

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A calorimeter for multilayer insulation (MLI) performance measurements at variable temperature

Cited by 12 publications

References 7 publications

Experimental performance of MLI blanket density and compression effects for use in GE MRI cryostat design

Experimental performance of MLI blanket density and compression effects for use in GE MRI cryostat design

Measurements of the apparent thermal conductivity of multi-layer insulation between 20 K and 90 K

Thermal coupon testing of Load-Bearing Multilayer Insulation

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