Solar liquid desiccant regeneration and nanofluids in evaporative cooling for greenhouse food production in Saudi Arabia
Solar liquid desiccant regeneration and nanofluids in evaporative cooling for greenhouse food production in Saudi Arabia
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DOI：
10.1016/j.solener.2016.04.048
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发表时间：
2016-09-01
期刊：
影响因子：
6.7
通讯作者：
Almitani, Khalid H.
中科院分区：
文献类型：
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作者：
Abu-Hamdeh, Nidal H.;Almitani, Khalid H.
本文是关于使用太阳能和液体干燥剂为高环境湿度气候下植物占据的空间提供蒸发冷却系统。该系统充分利用了纯太阳能对液体干燥剂的再生作用。研究并报告了气流对使用干燥剂系统获得的温室温度和通过传统蒸发冷却获得的温室温度的预测和测量平均每日最高温度的影响。相对于传统蒸发冷却系统，干燥剂蒸发冷却系统使温室内平均每日最高温度降低约6摄氏度。此外，采用管壳式热交换器配置来模拟植入干燥剂垫中并由冷却塔供应的纳米流体供给的管道。分析和讨论了改变纳米颗粒体积分数对假设的管壳式换热器的能量效率和传热系数的影响。对于体积浓度为0.01-0.04的Al2O3-W、Fe3O4-W和ZnO-W纳米流体，对流传热系数分别提高了7.20-14.40%、6.20-12.30%和5.50-9.01%。此外，还分析了能量效率，当体积分数为 0.01 至 0.04 的 ZnO、Fe3O4 和 Al2O3 纳米粒子悬浮在恒定流体质量流量的水中时，能量效率分别提高了 27.50-50.10%、25.01-40.10% 和 24.00-32.02%。采用动态指标（生命周期和年化生命周期成本）来评估该能源供应系统的经济效益。总生命周期成本为 11,206 美元，该系统的年生命周期成本为 1317 美元/年。 (c) 2016 Elsevier Ltd. 保留所有权利。
This article is about using solar energy and liquid desiccant to provide evaporative cooling systems of spaces occupied by plants in high ambient humidity climate. The system took full benefit of the regeneration of liquid desiccant by pure solar energy. The effect of airflow on the predicted and measured average daily maximums of greenhouse temperatures obtained using desiccant system and those obtained with conventional evaporative cooling for the month of June was investigated and reported. The desiccant evaporative cooling system lowered the average daily maximum temperatures in the greenhouse by about 6 degrees C relative to conventional evaporative cooling system. Furthermore, shell and tube heat exchanger configuration was adopted to simulate pipes implanted in the desiccant pad and fed with nanofluids supplied from a cooling tower. The effects of changing volume fractions of nanoparticles on energy effectiveness and heat transfer coefficient of an assumed shell and tube heat exchanger have been analyzed and discussed. Improvements on convective heat transfer coefficient of 7.20-14.40%, 6.20-12.30%, and 5.50-9.01% were obtained for 0.01-0.04 volume concentrations of Al2O3-W, Fe3O4-W, and ZnO-W nanofluids, respectively. In addition, energy effectiveness has been analyzed and enhancements of 27.50-50.10%, 25.01-40.10%, and 24.00-32.02% were obtained for volume fractions from 0.01 to 0.04 of ZnO, Fe3O4, and Al2O3 nanoparticles, respectively, suspended in water with constant mass flow rates of fluids. Dynamic indicators (life cycle and annualized life cycle costs) were applied to evaluate the economic-effectiveness of this energy supply system. The total life cycle cost was found to be $11,206 and the annualized life cycle cost for this system was found to be 1317 $/year. (c) 2016 Elsevier Ltd. All rights reserved.