Modeling of Heat and Mass Transfer in a TEC-Driven Lyophilizer 2006-01-2185
Dewatering of wet waste during space exploration missions is important for crew safety as it stabilizes the waste. It may also be used to recover water and serve as a preconditioning step for waste compaction. A thermoelectric cooler (TEC)- driven lyophilizer is under development at NASA Ames Research Center for this purpose. It has three major components: (i) an evaporator section where water vapor sublimes from the frozen waste, (ii) a condenser section where this water vapor deposits as ice, and (iii) a TEC section which serves as a heat pump to transfer heat from the condenser to the evaporator. This paper analyses the heat and mass transfer processes in the lyophilizer in an effort to understand the ice formation behavior in the condenser. The analysis is supported by experimental observations of ice formation patterns in two different condenser units.
Citation: Yuan, Z., Hegde, U., Litwiller, E., Flynn, M. et al., "Modeling of Heat and Mass Transfer in a TEC-Driven Lyophilizer," SAE Technical Paper 2006-01-2185, 2006, https://doi.org/10.4271/2006-01-2185. Download Citation
Author(s):
Zeng-Guang Yuan, Uday Hegde, Eric Litwiller, Michael Flynn, John Fisher
Affiliated:
National Center for Space Exploration Research, NASA Ames Research Center
Pages: 8
Event:
International Conference On Environmental Systems
ISSN:
0148-7191
e-ISSN:
2688-3627
Related Topics:
Water
Powder metallurgy
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