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首页> 外文期刊>Energy Conversion & Management >Performance of flat plate solar air heaters with optimum channel geometry for constant/variable flow operation
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Performance of flat plate solar air heaters with optimum channel geometry for constant/variable flow operation

机译：具有最佳通道几何形状的平板太阳能空气加热器的性能，可实现恒定/可变流量运行

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摘要

This study extends the applicability of the analytical criterion developed for estimating optimum channel geometry of conventional solar air heaters (SAHs) to other flat plate types. Assessment is made for two other basic types with flow over the absorber and on both sides of it. Heater performance characteristics are analytically determined over a wide range of channel depth-to-length ratios (D/K) and are compared with those of the conventional type, having a flow channel under the absorber. The effects of air mass flow rate, emissivity of channel plates and wind heat transfer coefficient on the accuracy of the criterion are also investigated. For these two SAHs, the criterion is found to be equally valid as it predicts the optimal (D/L) ratio that yields best perofrmnace. Further, the ratio of D/L=2.5×10~-3 represents the criterion simplified version for variable flow operation.
机译：这项研究将为估算常规太阳能空气加热器（SAH）的最佳通道几何形状而开发的分析标准的适用性扩展到其他平板类型。评估另外两个基本类型，其吸收器上方和两侧都有流量。在宽范围的通道深度与长度之比（D / K）上分析确定加热器的性能特征，并将其与在吸收器下方具有流道的常规类型的加热器进行比较。还研究了空气质量流量，通道板的发射率和风的传热系数对标准精度的影响。对于这两个SAH，发现该标准是同等有效的，因为它可以预测产生最佳性能的最佳（D / L）比。此外，D / L = 2.5×10〜-3的比率表示可变流量操作的标准简化形式。

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