Lyophilization for water recovery II, model validation

Eric Litwiller*, Martin Reinhard, John Fisher, Michael Flynn

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

2 Scopus citations


This paper presents results of research on a solid waste dryer, based of the process of lyophilization, which recovers water and stabilizes solid waste. A lyophilizer has been developed and tested that uses thermoelectric heat pumps (TECs) to recycle heat during drying. The properties of TECs facilitate direct measurement of heat flow rates, and heat flow data are used to evaluate a heat and mass transfer model of the thermoelectric lyophilizer. Data are consistent with the theoretical model in most respects. Practical problems such as insulation and vacuum maintenance are minor in this system. However, the model's assumption of a uniformly retreating ice layer during drying is valid only for the first 30% of water removed. Beyond this point, a shrinking core or lens model is more appropriate. Heat transfer to the shrinking core surrounded by dried material is slow. Additional experiments show that heat transfer to the core, and thus drying rate, can be improved dramatically by compressing the sample during drying.

Original languageEnglish (US)
Title of host publication34th International Conference on Environmental Systems, ICES 2004
StatePublished - 2004
Externally publishedYes
Event34th International Conference on Environmental Systems, ICES 2004 - Colorado Springs, CO, United States
Duration: Jul 19 2004Jul 22 2004


Other34th International Conference on Environmental Systems, ICES 2004
Country/TerritoryUnited States
CityColorado Springs, CO

ASJC Scopus subject areas

  • Automotive Engineering
  • Safety, Risk, Reliability and Quality
  • Pollution
  • Industrial and Manufacturing Engineering


Dive into the research topics of 'Lyophilization for water recovery II, model validation'. Together they form a unique fingerprint.

Cite this