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首页> 外文期刊>Building and Environment >Natural convection solar air heater: Bell-mouth integrated converging channel for high flow applications
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Natural convection solar air heater: Bell-mouth integrated converging channel for high flow applications

机译：自然对流太阳能加热器：钟声集成融合通道，用于高流量应用

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摘要

The bulk movement of fluid in natural convection solar air heater (SAH) is generated due to density variation and hence suffers from lower mass flow rates. Mounting additional surfaces/fins in SAH duct enhances the thermal characteristics, however, it comes at the cost of hydraulic performance. This limits the device usage in buildings and other high flow rate applications. In the present study, two new designs of SAH were numerically analyzed are: (a) taper flow passage for better thermal performance; (b) tapered designs incorporated with bell-mouth inlet opening for improved hydraulic performance. Parametric design analysis was conducted for large range of taper ratio and bell-mouth ratio. The results show that the tapered design is about 70% thermally more effective and about 6% higher Nusselt number per unit pressure drop than conventional SAH. A significant enhancement in hydraulic performance of more than 300% was observed when bell-shaped inlet design was integrated with the tapered designs. An independent correlation for Nusselt number variation has been developed as a function of Rayleigh number and tapper ratio. Predictions from the developed correlation is in excellent following with the numerical data.
机译：由于密度变化，产生了自然对流太阳能空气加热器（SAH）中的流体的散装运动，因此遭受较低质量流量的损失。安装额外的表面/翅片在SAH导管中提高了热特性，但是，它以液压性能的成本。这限制了建筑物和其他高流量应用中的设备使用。在本研究中，数值分析了两种SAH的新设计是：（a）锥形流动通道，可更好的热性能; （b）锥形设计，其与喇叭口入口开口，以改善液压性能。参数化设计分析进行大范围的锥度和钟口比。结果表明，锥形设计约为70％，热更有效，每单位压力下降约6％的营养数比常规SAH滴下降约6％。当钟形入口设计与锥形设计相结合时，观察到液压性能的显着增强。已经开发了Nusselt数变化的独立相关性作为瑞利数和Tapper比的函数。来自发达的相关性的预测与数值数据如下优异。

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