Simulation of thermal hydraulic performance of multiple parallel micropin arrays for concentrating solar thermal applications with supercritical carbon dioxide
Simulation of thermal hydraulic performance of multiple parallel micropin arrays for concentrating solar thermal applications with supercritical carbon dioxide
复制标题
用于超临界二氧化碳聚光太阳能热应用的多个平行微针阵列的热水力性能模拟
DOI：
10.1016/j.solener.2018.02.035
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发表时间：
2018
期刊：
影响因子：
6.7
通讯作者：
B. Fronk
中科院分区：
文献类型：
--
作者：
Matthew B. Hyder;B. Fronk
聚光太阳能发电厂 (CSP) 有潜力提供 24 小时可再生电力。当前的 CSP 系统资本和运营成本较高，这使得电力的平准化成本与传统技术相比缺乏竞争力。最近的实验研究表明，使用超临界二氧化碳作为工作流体，包含微针阵列（DH<1mm）的小单元电池（最大2×2cm）在高入射通量（>140Wcm−2）下有效运行的潜力。将该技术应用于 CSP 系统将导致更小的中央接收器，从而减少热损失，提高接收器效率并降低接收器组件的资本成本。本研究研究并解决了在集成模块设计中将这些小型单元电池编号为多个并联单元时的实际热和液压问题。开发了热水力网络模型来量化集成模块的分布和整体接收器效率。该模型用于指定最大允许晶胞尺寸和集管尺寸，以保持可接受的热性能和压力损失。一旦模块设计完成，就进行参数研究，以研究不同入射通量对模块的流量分布和热性能的影响。结果表明，可以实现集成模块设计，流量分布不均小于 5%，并且压降可以为系统的其余部分所接受。
Concentrated solar power (CSP) plants have the potential to provide 24 h, renewable electricity. Current CSP systems have high capital and operational costs which makes the levelized cost of electricity uncompetitive with conventional techniques. Recent experimental research has shown the potential of small unit cells (up to 2 × 2 cm) containing micropin arrays (DH< 1 mm) to operate efficiently at high incident flux (>140 W cm−2) using supercritical carbon dioxide as the working fluid. Applying this technology to CSP systems would result in a smaller central receiver, which would reduce thermal losses, increase receiver efficiency and reduce the capital cost of the receiver component.This study investigates and addresses the practical thermal and hydraulic issues in numbering up these small unit cells into numerous parallel cells within an integrated module design. A thermal hydraulic network model is developed to quantify the distribution and the overall receiver efficiency of an integrated module. This model is used to specify maximum allowable unit cell size and header dimensions to maintain acceptable thermal performance and pressure loss. Once a module design was finalized, parametric studies were performed to study the effects of varying incident flux on flow distribution and thermal performance of the module. The results show that an integrated module design can be achieved with less than 5% flow maldistribution and a pressure drop acceptable to the remainder of the system.