In this article the solar energy is utilized to generate needed steam for a power generation
cycle which in turn provides the required power of a RO system. Optimization
was carried out on two levels. First, Economizer, Evaporator, Super heater in power
generation cycle as well as the type of membrane, PV numbers and series were optimized.
In addition, the optimum design of a solar field for the system was carried out
and the collector specifications, number of branches, and flow rate were designed.
Based on the first level, optimization was designed to reduce costs and increase the
permeate water production and reduction in costs and pressure drop of the solar filed.
Preheating of the RO feed water had different effects on the production of fresh water
at various concentrations. For feed water with constant flow rate and concentration
of 45 000 ppm, the maximum rate of permeate flow was obtained at 26°C, while for
concentration of 35 000 ppm, the maximum permeate flow rate was achieved at
33°C. By using 5 parallel elements SW30XLE-400
for RO system, in the optimized
condition, permeate flow rate and recovery were 9494.19 (m3/day) and 59.5%, respectively.
In this condition, the unit production cost of water was 0.6046 ($/m3).
کلید واژگان :
desalination, optimization, reverse osmosis, solar field
