Nowadays the problem of water shortage and water pollution is very serious all over the world. Moreover, these limited water resources are faced with a very serious industrial and domestic pollution particularly in developing country like China. To solve the problem of water shortage, many methods have been proposed and studied. we designed a new water condensation system inspired by the principle of dehumidifier which can collect liquid water from humid air based on the water absorption nature of the concentrated lithium bromide solution (LiBr) coupled with the method of vacuum distillation. To verify the conception, we have built a small prototype of the system. Experiments with the prototype show that with a 2L (Liter) LiBr solution of 57% concentration, we can get 0.23g/s liquid water. The energy needed to get 1L liquid water is 7500 kJ which is relatively large. However, as most of the energy is used to heat the solution (4000kJ), we could easily applied solar energy into our system and energy efficiency optimization to reduce the consumption of energy. The proposed water collection system can work in a dryer and colder condition than traditional water condensation system. Preliminary results show the feasibility of this kind of system and open the water condensation technique to a larger scope of weather conditions. This proposed technical solution is a new alternative to climate change adaptation for dry land areas in particular. Improvement of the system is currently under investigation.
Cyril Cassisa, Shin Development Association, France
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