Novel modularized small-size solar seawater desalination system with multi-effect evaporating and heat recovery

作者：Guan, Hongyang; Liu, Zhenhua^*; Chen, Xiujuan

来源：Acta Energiae Solaris Sinica, 2015, 36(6): 1352-1357.

• Heat recovery unit
• High-pressure condition
• Performance of systems
• Performance ratio
• Radiation condition
• Seawater desalination
• Seawater desalination systems
• Vacuum tube collectors

A novel modularized small-size seawater desalination system powered by solar energy with multi-section heat recovery units was designed and tested. The system consisted of 5 heat collecting/heat recovery units. In each unit, there were a simplified CPC (Compound parabolic concentrating) reflector, an all-glass vacuum tube collector amounted an annular tube type heat exchanger for heat recovery and a water tank for delivering sea water. The system can be operated both under atmospheric pressure and high pressure condition. The high-temperature steam generated in each collecting unit is gradually condensed through the annular tube type heat exchanger in latter units. Thus, solar heat collecting and heat recovery processes are modularized in an all-glass vacuum tube collector and a large fraction of the latent heat of steam can be recycled to evaporate sea water in latter units. The freshwater yield, performance ratio of freshwater-making and the composite efficiency of heat collecting and heat recovery are measured and discussed in various solar radiation conditions. The experimental results show that the freshwater yield of unit collecting area can reach 1.2 kg/(h·m2), the highest value of performance ratio of freshwater-making is about 2, and the composite efficiency of collecting and heat recovery can reach about 90%, it indicates that freshwater-making performance of system is outstanding.

• 出版日期2015
• 单位上海交通大学