An ASME code compliant heat exchanger was manufactured for testing between high-temperature (up to 550 °C) helium and supercritical CO₂ test facilities at Georgia Institute of Technology. The multi-layerd printed-circuit heat exchanger (PCHE) consists of 17 photo-chemically etched plates which were diffusion-bonded together. Pressure losses and heat transfer measurements have been conducted for a zig-zag flow-path geometry etched into the bonded shims. These measurements have been presented in dimensionless form to facilitate comparison with thermohydraulic correlations available in the literature. The use of two fluids with drastically different properties in the same 37° zig-zag channel geometry provides a unique method of exploring the effect of working fluid on PCHE performance. Fanning friction factor and Nusselt numbers are determined for supercritical CO₂ between Reynolds number of 500–18,000, spanning laminar, transition, and turbulent regimes. The same friction and heat transfer figures of merit are presented for helium operating between Reynolds number 400–3200, spanning laminar and transition turbulent regimes. Two different exponential models were fitted to the supercritical CO₂ and helium friction data showing an agreement with the measurements to within $\pm 10\%$ over the range of test conditions. The model fitted to the heat transfer data is in agreement with the measurements to within $\pm 15\%$ of the range of test conditions. To enable reproducibility of the data, the methods used to define dimensions related to thermohydraulic calculations is discussed in details, and the dimensions provided by the engineering drawing of the exchanger are validated using high resolution computed tomography of the component. Finally, a detailed analysis of the thermohydraulic performance of the headers is given with the goal of setting a benchmark performance for comparison with other designs.

生产了符合ASME规范的热交换器，用于在高温（最高550°C）的氦气和超临界CO ₂之间进行测试佐治亚理工学院的测试设备。多层印刷电路换热器（PCHE）由17个光化学蚀刻板组成，这些板被扩散结合在一起。对于蚀刻到键合垫片中的之字形流路几何形状，已经进行了压力损失和传热测量。这些测量结果以无量纲形式呈现，以便于与文献中可用的热工相关性进行比较。在相同的37°之字形通道几何形状中使用两种性质截然不同的流体，提供了一种探索工作流体对PCHE性能的影响的独特方法。确定超临界CO _2的扇形摩擦因数和Nusselt数雷诺数介于500-18,000之间，涵盖层流，过渡和湍流状态。对于在雷诺数400–3200之间运行的氦气，其层流和过渡湍流状态，其摩擦系数和传热系数均相同。将两个不同的指数模型拟合到超临界CO ₂和氦气摩擦数据，表明与$\pm 10％$在测试条件范围内。拟合传热数据的模型与内部的测量值一致$\pm 15％$测试条件范围。为了实现数据的可重复性，将详细讨论用于定义与热工水力计算有关的尺寸的方法，并使用组件的高分辨率计算机断层扫描来验证交换器工程图所提供的尺寸。最后，对集管的热工液压性能进行了详细分析，目的是设定基准性能以便与其他设计进行比较。