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Experimental study of new solar air heater design

机译：新型太阳能空气加热器设计的实验研究

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The suitable design is the most important key to a cost-effective solar air heater. Although there are many techniques that have been proposed to improve the solar air heaters' performance by means of different turbulence promoters, they cannot ensure a compromise between the cost and the effectiveness. The aim of this study is to find simple and tolerable solution to get rid of the inconvenience resulting from the widely adopted heat-transfer-enhancement techniques by providing an optimized solar air heater design. The proposed design consists of a slightly curved smooth flow channel with an absorber plate of convex shape. A prototype of a curved solar air heater of 1.28 m(2) collector area was built and tested under summer outdoor conditions in Biskra (Algeria). The performance was evaluated in terms of thermal and effective efficiency for mass flow rates of 0.0172, 0.029, and 0.0472 kg/sm(2). It is observed that the overall efficiency of this solar air heater is considerably higher in comparison with the efficiency range of the conventional smooth flat plate heaters reported in the literature for similar operating conditions.
机译：合适的设计是成本效益高的太阳能空气加热器的最重要的关键。尽管已经提出了许多通过不同的湍流促进剂来改善太阳能空气加热器性能的技术，但是它们不能确保成本和效率之间的折衷。这项研究的目的是找到一种简单且可忍受的解决方案，以通过提供一种优化的太阳能空气加热器设计来消除因广泛采用的传热增强技术而带来的不便。所提出的设计包括一个略微弯曲的光滑流道，该流道带有一个凸形的吸收板。在夏季室外条件下在Biskra（阿尔及利亚）建造并测试了一个集热器面积为1.28 m（2）的弯曲太阳能空气加热器的原型。根据热效率和有效效率对质量流量0.0172、0.029和0.0472 kg / sm（2）进行了评估。可以看出，与文献中报道的传统的光滑平板加热器在类似的工作条件下的效率范围相比，该太阳能空气加热器的总体效率要高得多。

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