Background

solar collectors can meet the sanitary hot water requirements. In this way, the use of nanofluids in solar domestic hot water (SDHW) can improve the effectiveness. The main purpose of this paper was to examine the thermal behavior of SDHW in the presence of nanoparticles for three climate zone.

Methods

The efficacy of using Al₂O₃ and ZnO nanoparticles into the water on energy-saving parameter was examined utilizing transient techniques.

Findings

the results revealed that owing to using SDHW filled with water, the annual energy usage was reduced by 1002.5, 939.25 and 758.5 $\frac{kWh}{m^2}$ for zones A, B and C. It was found that the addition of nanoparticles could improve the usefulness of SDHW system. If Al₂O₃ nano-scale particles were added to water, the SDHW effectiveness was improved by 12.1% (for zone A), 13.3% (zone B) and 18.7% (zone C). For ZnO nanoparticles, this figure was 6%, 6.6 and 10.8% for zones A, B and C, respectively. Therefore, the profitability of solar energy was intensified further by the addition of Al₂O₃ nanoparticles.

中文翻译：

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使用 Al ₂ O ₃和 ZnO 纳米粒子提高太阳能生活热水效率：专注于年度节能

背景

太阳能集热器可以满足卫生热水要求。这样，在太阳能生活热水（SDHW）中使用纳米流体可以提高效率。本文的主要目的是研究三个气候区在纳米粒子存在下 SDHW 的热行为。

方法

利用瞬态技术研究了将Al ₂ O ₃和ZnO纳米颗粒加入水中对节能参数的功效。

发现

结果显示，由于使用装满水的SDHW，每年的能源使用量分别减少了1002.5、939.25和758.5 $\frac{克宽H}{{米}^2}$对于 A、B 和 C 区。发现添加纳米粒子可以提高 SDHW 系统的有用性。如果将Al ₂ O ₃ 纳米级颗粒添加到水中，SDHW 效率提高了12.1%（对于A 区）、13.3%（B 区）和18.7%（C 区）。对于 ZnO 纳米颗粒，A、B 和 C 区的这一数字分别为 6%、6.6 和 10.8%。因此，通过添加Al ₂ O ₃纳米颗粒进一步增强了太阳能的盈利能力。