真空管集热的太阳能低温多效海水淡化系统变负荷性能研究

Performance analysis on fluctuation-load condition of low temperature multi-effect solar distillation system with evacuated tube collectors

中文关键词: 太阳能  海水淡化  低温多效蒸发  真空管集热器  变负荷

英文关键词: Solar energy  Seawater desalination  Low temperature multi-effect distillation ,LT-MED  Evacuated tube collectors  Change load

中文摘要:

      建立了真空管集热的太阳能低温多效海水淡化系统的数学模型,利用ＭＡＴＬＡＢ对其进行了求解。从造水量和耗能量两方面分析了定负荷和变负荷系统的性能。分析结果表明：定负荷时的年造水量稍大于变负荷时的年造水量；定负荷时,在1、2、6、11、12月份需要电辅子系统加热,耗电量大,在其他月份需要冷却子系统排走太阳能供热系统提供的多余热量,增加了单位造水总能耗。变负荷时系统造水量在40%~110%范围内变化,与定负荷系统相比耗电少,对热能利用较充分。

英文摘要:

      Mathematical model of low temperature multi-effect distillation (LT-MED) system with solar energy and evacuated tube collectors is established and calculated under MATLAB platform. Productivity and energy consumption of two systems, fixed load and fluctuant load, were analyzed. When the auxiliary heating system exists and the water yield load is fixed, the accumulated production of the whole year is slightly more than the fluctuation-load production without auxiliary heating system. When the productivity is fixed, auxiliary heating is necessary in January, February, June, November and December. It consumes a great amount of electricity. Meanwhile, in the other months, the external thermal energy from solar collectors is removed by cooling medium and the total energy consumption per unit of productivity increases. For fluctuation-load system, the load ranges from 40% to 110%, and its electricity consumption is relatively less and the heat is fully usable.