Study of falling film evaporation process in a vapor compression desalination system
An analysis of falling fi lm evaporation of saltwater has been carried out for a vapor compression desalination pilot plant. Detailed modeling and simulation have been used to fi nd the temperature and concentration variation inside the fi lm on a vertical tube evaporator. The heat and mass trans...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Desalination Publications
2012
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| Subjects: | |
| Online Access: | http://irep.iium.edu.my/26684/ http://irep.iium.edu.my/26684/ http://irep.iium.edu.my/26684/ http://irep.iium.edu.my/26684/1/DWT_Rubina21_7859_Balaban.pdf |
| Summary: | An analysis of falling fi lm evaporation of saltwater has been carried out for a vapor compression
desalination pilot plant. Detailed modeling and simulation have been used to fi nd the
temperature and concentration variation inside the fi lm on a vertical tube evaporator. The heat
and mass transfer phenomenon were analyzed using basic conservation equations. To evaluate
the performance of the rig, three operating variables were considered, which included the top
brine temperature (TBT), compressor speed and brine concentration. Performance of the rig
was dominated by compressor speed and top brine temperature. The highest distillate production
rate experimentally obtained was 20 kg/h for the compressor speed of 2400 rpm at a TBT of
102oC. From the simulation, it was found that the feed concentration rapidly increased near the
falling fi lm-vapor interface. The numerical results have been compared with the experimental
values in terms of distillate produced, and good agreement was found. |
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