Energy Resources Engineering Department, Egypt-Japan University of Science and Technology (E-JUST), Alexandria, Egypt.
Mechanical Engineering Department, Faculty of Engineering, Assiut University, Assiut, Egypt.
Environ Sci Pollut Res Int. 2021 Feb;28(5):5482-5494. doi: 10.1007/s11356-020-10803-2. Epub 2020 Sep 23.
In this work, experimental work is presented on the performance of a hybrid solar distiller comprising solar still (SS) combined with parabolic trough solar collector (PTSC) using direct heating of salty water by the collector. In this technique, the salty water supplied to the SS is heated by passing it directly through the parabolic receiver without using heat transfer mediums that reduce the system efficiency. The study is carried out at different salty water depths inside the SS basin under hot climate conditions of Upper Egypt. The system performance is compared with a previous system using oil as a heat transfer medium between PTSC and still (indirect heating). The advantages of this technique are its ability to reduce initial salty water depth in the basin and avoid using the pumping system and heat exchanger compared to the direct heating. The performance of the proposed system is evaluated based on productivity, energy payback time (EPBT), exergy, enviroeconomic, and exergoeconomic methodologies. Findings illustrate that the present system rises the energy efficiency by about 12%, 27.5%, and 46% and the system exergy efficiency by about 14%, 30%, and 49% at salty water depth 15 mm, 10 mm, and 5 mm in the basin compared with the indirect heating system. Moreover, using this technique of salty water heating reduces the production cost of freshwater by about 71% compared with the direct heating system. The exergoeconomic and enviroeconomic parameters of the direct heating mechanism are more effective compared with those of the indirect heating mechanism.
本工作提出了一种混合太阳能蒸馏器的实验研究，该蒸馏器由太阳能蒸馏器（SS）与抛物槽式太阳能集热器（PTSC）组成，采用集热器直接加热盐水。在该技术中，通过将盐水直接通过抛物面接收器而不使用降低系统效率的传热介质来加热供给 SS 的盐水。该研究是在埃及上埃及炎热气候条件下，在 SS 盆内不同盐水深度下进行的。将系统性能与以前使用油作为 PTSC 和蒸馏器之间的传热介质的系统（间接加热）进行了比较。与直接加热相比，该技术的优点在于能够减少盆内初始盐水深度，避免使用泵送系统和热交换器。基于产率、能量回收期 (EPBT)、火用、环境经济和火用经济方法对提出的系统性能进行了评估。研究结果表明，与间接加热系统相比，在盆地内盐水深度为 15mm、10mm 和 5mm 时，本系统的能量效率提高了约 12%、27.5%和 46%，系统火用效率提高了约 14%、30%和 49%。此外，与直接加热系统相比，使用这种盐水加热技术可将淡水的生产成本降低约 71%。与间接加热机制相比，直接加热机制的火用经济和环境经济参数更有效。
