PDF Publication Title:
Text from PDF Page: 026
26 Chapter 4. Non-Aqueous PEC System Stable permeability in use for 4–6 years over the temperature range expected on Mars. Membrane permeability can be affected by two types of changes in mechanical properties: aging of the structure of the membrane matrix, which is usually synthesized far from equilibrium, and fracture. Both processes are affected by temperature. The average temperature on Mars is 210 K, spanning a roughly ±90 K range depending on latitude, time of day, height above the surface, and time of year. As temperature increases and decreases, all materials in the PEC cell will expand and contract according to their thermal coefficients of expansion. Polymers can vary widely in response to thermal swings depending on their internal morphology. They will densify to some degree because of relaxation of the molecular chains, directly reducing their permeability (Murphy et al., 2011; Huang & Paul, 2004). This effect is counterbalanced by plasticization as described above, but cannot be neutralized. Although polymers are generally less brittle than inorganic materials, if temperature variations are accompanied by significant density changes or phase changes, the differential coefficients of thermal expansion of the membrane and materials in contact with it can cause the membrane material to develop cracks, allowing electrolyte leakage and mixtures that should be separated to pass through unchanged. The mechanical properties of polymer-based membranes must be carefully matched to those of their framing and mounting materials. The remedy is precise temperature control of CO2 reduction cells both in use and at rest by incorporating stored heat capabilities or separate heaters into the design of the units.PDF Image | ISRU Challenge Production of O2 and Fuel from CO2
PDF Search Title:
ISRU Challenge Production of O2 and Fuel from CO2Original File Name Searched:
ISRU_final_report.pdfDIY PDF Search: Google It | Yahoo | Bing
Salgenx Redox Flow Battery Technology: Power up your energy storage game with Salgenx Salt Water Battery. With its advanced technology, the flow battery provides reliable, scalable, and sustainable energy storage for utility-scale projects. Upgrade to a Salgenx flow battery today and take control of your energy future.
CONTACT TEL: 608-238-6001 Email: greg@salgenx.com (Standard Web Page)