负压条件管式太阳能蒸馏空腔的传热传质特性
发布时间：2018-08-14 14:23
【摘要】：针对目前管式太阳能蒸馏装置在常压运行时产水率较低的问题,提出了一种可在真空负压条件下连续补水运行的管式蒸馏方法,并在定温及定功率加热条件下,测试了实验样机负压运行时的温度及产水率变化,证明了所提出的负压条件下运行的管式蒸馏方法优于常压运行的一般蒸馏方法。在PT=40 k Pa、Qh=200 W定功率加热实验中,空腔传热温差比常压运行时降低约40%;装置全天累计产水量为1.9 kg,比常压运行时产水量增加22.5%。基于稳态实验数据得到了负压修正的空腔传质计算关系式,在此基础上构建了管式蒸馏装置在负压条件运行时的产水率预测模型,其对实验样机全天累计产水预测误差和最大产水率误差分别为2.1%和4%。
[Abstract]:In order to solve the problem of low water production rate of tubular solar distillation unit under normal pressure, a new method for continuous rehydration operation under vacuum negative pressure is put forward, and under the condition of constant temperature and constant power heating, a tube distillation method is put forward. The temperature and water yield of the experimental prototype under negative pressure are measured. It is proved that the tube distillation method proposed in this paper is superior to the general distillation method under normal pressure. In the constant power heating experiment of PT=40 k Pax QH ~ (2 +) 200 W, the heat transfer temperature difference of the cavity is about 40% lower than that of the normal pressure operation, and the accumulative water output of the unit is 1.9 kg, which is 22. 5% higher than that of the normal pressure operation. Based on the steady-state experimental data, a negative pressure modified formula for mass transfer in a cavity is obtained, and a model for predicting the water yield of a tubular distillation unit under the condition of negative pressure is constructed. The accumulative water yield prediction error and the maximum water yield error for the experimental prototype are 2.1% and 4% respectively.
【作者单位】： 四川大学水力学与山区河流开发保护国家重点实验室;
【基金】：国家自然科学基金项目(51606130,51376052)~~
【分类号】：P747.14
本文编号：2183140
[Abstract]:In order to solve the problem of low water production rate of tubular solar distillation unit under normal pressure, a new method for continuous rehydration operation under vacuum negative pressure is put forward, and under the condition of constant temperature and constant power heating, a tube distillation method is put forward. The temperature and water yield of the experimental prototype under negative pressure are measured. It is proved that the tube distillation method proposed in this paper is superior to the general distillation method under normal pressure. In the constant power heating experiment of PT=40 k Pax QH ~ (2 +) 200 W, the heat transfer temperature difference of the cavity is about 40% lower than that of the normal pressure operation, and the accumulative water output of the unit is 1.9 kg, which is 22. 5% higher than that of the normal pressure operation. Based on the steady-state experimental data, a negative pressure modified formula for mass transfer in a cavity is obtained, and a model for predicting the water yield of a tubular distillation unit under the condition of negative pressure is constructed. The accumulative water yield prediction error and the maximum water yield error for the experimental prototype are 2.1% and 4% respectively.
【作者单位】： 四川大学水力学与山区河流开发保护国家重点实验室;
【基金】：国家自然科学基金项目(51606130,51376052)~~
【分类号】：P747.14
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