Conveners
C2PoA - Thermal Insulation Systems I
- Jennifer Marquardt (Ball)
- James Fesmire (NASA / KSC)
Lightweight engineering polymers and additive manufacturing have enabled development of a new cryogenic liquid storage paradigm. State of the art cryogenic storage dewars typically conform to a vacuum jacketed thin wall stainless steel vessel with multi-layer insulation design. While resulting in low boil-off rates, the specific energy is often insufficient for use in weight sensitive...
Cryogenic permeation of helium and hydrogen is important for the development of light-weight insulation systems. In this work, we utilized a custom membrane support structure to measure helium and hydrogen permeation rates with a calibrated Adixen Graph D+ variable mass leak detector. Preliminary steady-state and thermal-transient tests of cryogenic helium and hydrogen permeating through 1 mil...
The Cryogenic Current Comparator (CCC) and its purpose built cryostat were installed in the low-energy Antiproton Decelerator (AD) at CERN in 2015. A pulse-tube cryocooler recondenses evaporated helium to liquid at 4.25 K filling the inner vessel of the cryostat at an equivalent cooling power of 0.55 W. To reduce the transmission of vibration to the highly sensitive CCC the titanium support...
In this paper, a thermal switch used in an integrated cooler system, which consists of a single stage pulse tube refrigerator integrated with a small amount of a phase change material, will be introduced. During the heat load operation, the phase change unit absorbs heat loads by melting a substance in a constant pressure-temperature-volume process, meanwhile, the refrigerator is stopped to...
Boil-off calorimetric measurements of Multilayer Insulation (MLI) performances between 4.2 K and shield temperatures varying between 20 K and 60 K are in preparation at CERN for an extensive characterization of MLI blankets of the LHC type. These tests will extend the performance measurements of the blankets to thermal shield temperatures lower than nominal as well as providing performance...
Long duration storage of cryogenic fluids is an essential requirement for space missions. Thermal optimization of the storage system is a key objective of the design process to minimize environmental heat leak. The objective of this research is to focus on the thermal optimization of the vapor cooled shield (VCS) in cryogenic liquid storage. Two types of the vapor cooled shield have been...