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HIGH-PERFORMANCE COMPUTING TO ENABLE NEXT-GENERATION LOW-TEMPERATURE WASTE HEAT RECOVERY

机译：高性能计算，以实现下一代低温废热回收

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The Oak Ridge National Laboratory (ORNL), in collaboration with Eaton Corporation, has performed computational research and development to design an innovative, direct-contact heat exchanger (DCHE) that is optimized for a low-temperature organic Rankine cycle. A computational fluid dynamics (CFD) model of DCHE was developed in STAR-CCM+ which was later calibrated and validated against the experimental data from literature. The validated CFD model was used to develop an industry-relevant liquid-liquid direct-contact heat exchanger system with water and pentane working fluids. This work heavily relied on high-performance computing (HPC) resources to investigate multiple designs and to identify a baseline design. The innovative design consists of two chambers connected by a converging-diverging nozzle. Phase change for pentane, from liquid to vapor, occurs in the first chamber, whereas the second chamber serves as a separator. Outlets in the second chamber are staggered to prevent entrainment of the liquid water by the gaseous pentane. CFD results confirm that the design behaves as expected and the addition of baffles enhances mixing and heat transfer for higher flow rates while preventing entrainment of gaseous pentane by the liquid water.
机译：橡树岭国家实验室（ORNL）与伊顿公司合作，已经进行了计算研发，设计了一种针对低温有机朗肯循环优化的创新，直接的热交换器（DCHE）。 DCHE的计算流体动力学（CFD）模型在星形CCM +中开发，后来校准并验证了来自文献的实验数据。经过验证的CFD模型用于开发具有水和戊烷工作流体的行业相关的液体直接接触式热交换器系统。这项工作依赖于高性能计算（HPC）资源来调查多种设计并识别基线设计。创新的设计由两个由聚合散热喷嘴连接的腔室组成。从液体到蒸汽的戊烷的相变发生在第一腔室中，而第二腔室用作分离器。第二腔室中的出口被交错以防止气态戊烷夹带液态水。 CFD结果证实，该设计的行为正如预期的行为，并且增加挡板增强了更高流速的混合和传热，同时防止液态水夹带气态戊烷。

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