Heat transfer, efficiency and turn-down ratio of a dynamic radiative heat exchanger
Heat transfer, efficiency and turn-down ratio of a dynamic radiative heat exchanger
复制标题
动态辐射换热器的传热、效率和调节比
DOI：
10.1016/j.ijheatmasstransfer.2019.118441
复制
发表时间：
2019
影响因子：
5.2
通讯作者：
Iverson, Brian D.
中科院分区：
文献类型：
--
作者：
Mulford, Rydge B.;Jones, Matthew R.;Iverson, Brian D.
在热控系统的设计和优化中，有效的传热是至关重要的。静态辐射热交换器通常是简单可靠的系统，但通常不能适应环境变化。可适应的辐射热交换器可以根据热环境或运行条件的变化进行调整，具有提高效率和降低成本的潜力。通过对分段的自辐射翅片进行几何操作，可以实现对辐射换热器的动态控制，该翅片由刚性面板组成，这些面板通过手风琴布置中的热铰链连接。本文建立了一个数值模型来预测辐射换热器的温度分布和效率，该模型考虑了导热和自辐照的影响。根据传导-辐射相互作用参数、表面发射率、驱动角和连接面板的铰链的导热系数，建立了控制方程。结果表明，对于真实的面板几何形状和材料，降温比(最大可能热率除以最小可能热率)大于3是可能的。自辐射降低了黑度比，而且有证据表明，对于任何面板几何形状和设备温度的组合，都存在一个最佳的刚性面板数量。当平板处于折叠位置时，效率最高，但在这种配置下，热速最小。最后，与热铰的性能相比，板材的性能和几何形状对折弯率的影响更为显著。
Efficient heat transfer is critical in the design and optimization of thermal control systems. Static radiative heat exchangers are often simple and reliable systems but typically cannot be adapted to environmental changes. Adaptable radiative heat exchangers can be adjusted in response to variations in the thermal environment or operating conditions and have the potential for increased efficiency and reduced cost. Dynamic control of a radiative heat exchanger is possible through geometric manipulation of a segmented, self-irradiating fin, consisting of rigid panels that are linked by thermal hinges in an accordion arrangement. In this paper, a numerical model is described to predict the temperature profile and efficiency of a radiative heat exchanger, accounting for conduction and self-irradiation. Governing equations are cast in terms of the conduction-radiation interaction parameter, surface emissivity, actuation angle, and the thermal conductance of the hinges linking the panels. Results indicate that a turn-down ratio (largest possible heat rate divided by smallest possible heat rate) of greater than three is possible for realistic panel geometries and materials. Self-irradiation decreases the turn-down ratio, and there is evidence that an optimal number of rigid panels exists for any combination of panel geometry and device temperature. The maximum efficiency occurs when the plates are in the collapsed position, but the heat rate is at a minimum in this configuration. Finally, the properties and geometry of the plates are shown to have a more significant effect on the turn-down ratio than the properties of the thermal hinges.
登录
查看更多内容
包括散热器元件之间相互辐射的散热片阵列优化
DOI：
--
发表时间：
1991
期刊：
影响因子：
--
作者：
B. Chung;B. X. Zhang
通讯作者：
B. X. Zhang
基于形状记忆合金扭矩管的变形散热器的演示
DOI：
--
发表时间：
2018
期刊：
Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring
影响因子：
--
作者：
Jorge B. Chong;P. Walgren;D. Hartl
通讯作者：
D. Hartl
折纸结构表面的自适应净辐射传热和热管理
DOI：
10.1615/ihtc16.rti.023600
发表时间：
2018
期刊：
China
影响因子：
--
作者：
Iverson, Brian D.;Mulford, Rydge B.;Lee, Ernest T.;Jones, Matthew R.
通讯作者：
Jones, Matthew R.
DOI：
--
发表时间：
2004
期刊：
影响因子：
--
作者：
M. Deiveegan;S. Katte
通讯作者：
S. Katte
镜面反射无限V型槽的总半球视辐射特性
DOI：
10.1016/j.ijheatmasstransfer.2018.03.041
发表时间：
2018
影响因子：
5.2
作者：
Mulford, Rydge B.;Collins, Nathan S.;Farnsworth, Michael S.;Jones, Matthew R.;Iverson, Brian D.
通讯作者：
Iverson, Brian D.