Modeling analysis on solar steam generator employed in multi-effect distillation (MED) system
Modeling analysis on solar steam generator employed in multi-effect distillation (MED) system
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DOI：
10.1007/s11708-019-0608-0
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发表时间：
2019-03
影响因子：
2.9
通讯作者：
Zhaorui Zhao;Bao Yang;Z. Xing
中科院分区：
文献类型：
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作者：
Zhaorui Zhao;Bao Yang;Z. Xing
近年来，多孔双层木质太阳能集热器因其在太阳能海水淡化方面的潜在应用而受到越来越多的关注。本文开发了一个热力学模型来分析木材太阳能集热器的性能。还进行了建模分析，以评估与多孔木材太阳能集热器集成的多效海水淡化（MED）系统的性能和运行条件。具体而言，在与双层木质太阳能蒸汽发生器相结合的MED海水淡化系统中，研究了动力蒸汽温度、海水流量、输入太阳能和每生产一吨蒸馏水的能耗等运行参数的影响。结果发现，在给定的运行条件下，木材太阳能集热器中存在145℃左右的最佳蒸汽发生温度，使得MED系统的单位电耗达到最小值24.88kWh/t。平均温差受太阳能供热能力影响显着。随着太阳能容量从50kW增加到230kW，平均温差从1.88℃增加到6.27℃。这项参数模拟研究将有助于高效双层木材太阳能蒸汽发生器以及MED海水淡化系统的设计。
Recently the porous bilayer wood solar collectors have drawn increasing attention because of their potential application in solar desalination. In this paper, a thermodynamic model has been developed to analyze the performance of the wood solar collector. A modeling analysis has also been conducted to assess the performance and operating conditions of the multiple effect desalination (MED) system integrated with the porous wood solar collector. Specifically, the effects of operating parameters, such as the motive steam temperature, seawater flow rate, input solar energy and number of effects on the energy consumption for each ton of distilled water produced have been investigated in the MED desalination system combined with the bilayer wood solar steam generator. It is found that, under a given operating condition, there exists an optimum steam generation temperature of around 145°C in the wood solar collector, so that the specific power consumption in the MED system reaches a minimum value of 24.88 kWh/t. The average temperature difference is significantly affected by the solar heating capacity. With the solar capacity increasing from 50 kW to 230 kW, the average temperature difference increases from 1.88°C to 6.27°C. This parametric simulation study will help the design of efficient bilayer wood solar steam generator as well as the MED desalination system.