The vacuum freezing process is presently being developed in two forms, both of which are designed to eliminate the large water vapor compressor which has limited module size and perhaps acceptance of the process in the past. A 95 m3/day (25,000 gpd) AFVC process pilot plant is under test which uses a low temperature sodium chloride absorber loop in conjunction with a closed cycle mechanical refrigeration system in place of a vapor compressor.A 225 m3/day (60,000 gpd) VFEA process pilot plant design has been completed that uses a sodium hydroxide absorbent cycle driving a low pressure steam ejector to eliminate the vapor compressor in a thermally driven vacuum process. New thrusts have begun for development of Indirect Freezing Processes using controlled conditions to prevent ice formation on heat transfer surfaces. An Eutectic freezing pilot plant is being constructed whose effluent is to be only salts and potable water. Freezing processes offer many possibilities for combinations of Rankine or Photovoltaic solar cycles using the reject heat for low temperature absorption refrigeration.
Current developments in freezing processes
Laufende Entwicklungen bei Gefrierprozessen
Solar Desalinisation Workshop. Solar Energy Res. Inst. ; CP-761 , Mar ; 113-130
1981
18 Seiten, 6 Bilder, 1 Tabelle, 11 Quellen
Conference paper
English
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