STTR Phase II: Condensing Ejector for Second-Step Compression in Reversed Rankine Cycle

这项小型企业技术转让（STTR）二期项目旨在继续研究和分析制冷循环中用于第二级压缩的冷凝喷射器。冷凝喷射器是一种两相喷射装置，它产生的出口压力高于任何一种进口压力。该项目结合了理论和实验模型，以便设计用于更高效制冷系统的冷凝喷射器。结果表明，新设计能够将R22制冷剂的蒸汽压缩制冷循环效率提高约三分之一。我们的目标是使用R410A等环保制冷剂来接近这一理想值。临界两相流装置的应用将导致制冷和空调以及未来可能用于推进和发电的更有效的热力学循环的发展。该项目的广泛影响和商业潜力将通过减少我国对外国石油的依赖，提高核反应堆和天然气管道的安全性，以及更好地了解两相流现象，带来可观的经济和社会效益。在热泵中应用冷凝喷射器理论可以促进能源选择有限的偏远社区使用可再生地热能源。该项目通过为评估两相流的新方法提供技术平台，导致了技术的实现。处理快速相变模拟的能力引起了汽车行业对模拟汽车燃油喷射中的闪沸的兴趣。为从根本上建立新的两相流设备工程设计方法提供了依据。

This Small Business Technology Transfer (STTR) Phase II project seeks to continue the research and analysis of condensing ejectors for second stage compression in a refrigeration cycle. A condensing ejector is a two-phase jet device that produces outlet pressure higher than either of inlet pressures. The project combines theoretical and experimental models in order to design the condensing ejector for use in more efficient refrigeration systems. The results thus far show that the new design is capable of improving the efficiency of vapor compression refrigeration cycle by approximately one-third with R22 refrigerant. The goal is to draw closer to this ideal value with environmentally friendly refrigerants like R410A. The application of critical two-phase flow devices will lead to development of more efficient thermodynamic cycles for refrigeration and A/C and in the future possibly for propulsion and power generation. The broader impact/commercial potential from this project will bring considerable economic and societal benefits by reducing our nation's dependence on foreign oil, improving safety of nuclear reactors and natural gas pipelines, and better understanding of phenomena of two-phase flow. Applications of the condensing ejector theory in heat pumps might promote use of renewable geothermal energy sources in the remote communities with limited energy choices. This project leads to enabling technologies by providing the technology platform for a new approach to evaluating two-phase flows. The capability to handle rapid phase change simulations has generated interest from the automotive industry to simulate flash boiling in automotive fuel injection. This project also provides the basis for establishing fundamentally new engineering and designing methods for equipment operating on two-phase flow.