Simplified models of the symmetric single-pass parallel-plate counterflow heat exchanger: a tutorial
Simplified models of the symmetric single-pass parallel-plate counterflow heat exchanger: a tutorial
复制标题
对称单程平行板逆流换热器的简化模型：教程
DOI：
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发表时间：
2018
影响因子：
3.5
通讯作者：
B. Abraham
中科院分区：
文献类型：
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作者：
W. Pickard;B. Abraham
热交换器在实际的热过程中是重要的，特别是那些(i)熔盐储存方案，（ii）压缩空气储能方案和（iii）其他负荷转移热储存假定为智能电网的基础。这种装置虽然是利用可持续（但断断续续）可再生能源的核心，但对许多科学家来说将是不熟悉的，尽管他们需要这些装置的工作知识。这篇教程论文为这些人提供了一个很大程度上独立的概念介绍。首先对一种新型的量子化交换器进行建模，1作为一种设备是不切实际的，但对于理解潜在的热物理是有用的。然后回顾了一维稳态理想化，证明传热的有效性随着（器件长度）/（器件吞吐量）单调增加。其次，给出了塞流的二维稳态理想状态，并由此导出了一个新的传递效率公式；该公式与hagan - poiseuille流下二维理想化的时域有限差分解很好地吻合。这些结果与结论一致，即热交换的有效性可以接近统一，但可能涉及设备成本，尺寸和吞吐量之间的不受欢迎的权衡。
The heat exchanger is important in practical thermal processes, especially those of (i) the molten-salt storage schemes, (ii) compressed air energy storage schemes and (iii) other load-shifting thermal storage presumed to undergird a Smart Grid. Such devices, although central to the utilization of energy from sustainable (but intermittent) renewable sources, will be unfamiliar to many scientists, who nevertheless need a working knowledge of them. This tutorial paper provides a largely self-contained conceptual introduction for such persons. It begins by modelling a novel quantized exchanger,1 impractical as a device, but useful for comprehending the underlying thermophysics. It then reviews the one-dimensional steady-state idealization which demonstrates that effectiveness of heat transfer increases monotonically with (device length)/(device throughput). Next, it presents a two-dimensional steady-state idealization for plug flow and from it derives a novel formula for effectiveness of transfer; this formula is then shown to agree well with a finite-difference time-domain solution of the two-dimensional idealization under Hagen–Poiseuille flow. These results are consistent with a conclusion that effectiveness of heat exchange can approach unity, but may involve unwelcome trade-offs among device cost, size and throughput.