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This content will become publicly available on November 21, 2018

Title: Novel thermal efficiency-based model for determination of thermal conductivity of membrane distillation membranes

Development and selection of membranes for membrane distillation (MD) could be accelerated if all performance-determining characteristics of the membrane could be obtained during MD operation without the need to recur to specialized or cumbersome porosity or thermal conductivity measurement techniques. By redefining the thermal efficiency, the Schofield method could be adapted to describe the flux without prior knowledge of membrane porosity, thickness, or thermal conductivity. A total of 17 commercially available membranes were analyzed in terms of flux and thermal efficiency to assess their suitability for application in MD. The thermal-efficiency based model described the flux with an average %RMSE of 4.5%, which was in the same range as the standard deviation on the measured flux. The redefinition of the thermal efficiency also enabled MD to be used as a novel thermal conductivity measurement device for thin porous hydrophobic films that cannot be measured with the conventional laser flash diffusivity technique.
 [1] ;  [1] ;  [2] ;  [1] ;  [3] ;  [4] ;  [1]
  1. Colorado School of Mines, Golden, CO (United States)
  2. Univ. of Arizona, Tucson, AZ (United States)
  3. Univ. of California, Los Angeles, CA (United States)
  4. National Renewable Energy Lab. (NREL), Golden, CO (United States)
Publication Date:
Report Number(s):
Journal ID: ISSN 0376-7388; TRN: US1800418
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Journal of Membrane Science
Additional Journal Information:
Journal Volume: 548; Journal Issue: C; Journal ID: ISSN 0376-7388
Research Org:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org:
USDOE Advanced Research Projects Agency - Energy (ARPA-E)
Country of Publication:
United States
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; membrane distillation; desalination; thermal efficiency; low-grade heat; thermal conductivity; conductive heat transfer coefficient
OSTI Identifier: