Abstract Thermal storage system with flat plate solar collector is performed in Faculty of Engineering, Menoufia University, Shebin El-Kom, Egypt, at Latitude of 30.56° N and Longitude of 31.01° E. The thermal storage system consists of insulated water tank, recirculation pump and flat plate solar collector to collect the solar energy and store it as a sensible energy. The measurements have been conducted from August 2015 to August 2016. The results showed that, the storage tank temperature is attained to about 80 °C in summer and 55 °C in winter. The average stored energy is attained maximum to 16.11 MJ/day in summer, and minimum to 10.26 MJ/day in autumn. The average yearly stored energy reached about 13.69 MJ/day. Zinc Oxide nanoparticles with average diameter of 23 nm have been added to the tap water to produce the nanofluid with volume fractions of 0.05% and 0.1%. The stored energy is increased by 3.36% and 7.78% for volume fraction of 0.05% and 0.1%. Also the daily efficiency is increased by 4.81% and 6.57%, for volume fraction of 0.05% and 0.1% compared to the previous state without nanoparticles.

中文翻译：

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具有平板太阳能集热器和水-氧化锌纳米流体的储能系统

摘要 带有平板太阳能集热器的蓄热系统在埃及 Shebin El-Kom 的 Menoufia 大学工程学院进行，位于北纬 30.56°，东经 31.01°。蓄热系统由隔热水箱、再循环系统组成。泵和平板太阳能集热器收集太阳能并将其存储为显能。测量时间为2015年8月至2016年8月。结果表明，储罐温度夏季达到80℃左右，冬季达到55℃左右。平均储存能量在夏季最高可达 16.11 MJ/天，秋季最低可达 10.26 MJ/天。年平均储存能量达到约 13.69 兆焦/天。将平均直径为 23 nm 的氧化锌纳米颗粒添加到自来水中以制备体积分数为 0.05% 和 0.1% 的纳米流体。体积分数分别为 0.05% 和 0.1% 时，储存的能量分别增加了 3.36% 和 7.78%。与之前没有纳米颗粒的状态相比，每日效率提高了 4.81% 和 6.57%，体积分数分别为 0.05% 和 0.1%。