Abstract In this paper, a conceptual design of decoupled duplex Stirling machine was described. The motions of the displacers and the shared piston were decoupled by controlling the displacers and piston to be stationary at the top or bottom dead center. The overall coefficient of performance (COPoverall) of decoupled duplex Stirling machine could achieve 1.11–1.4 and 1.7–2.1 for cooling and heating respectively. In order to meet the constraint of work equality of engine and cooler at the off-design conditions, two methods of decreasing the hot temperature and increasing the dead volume were employed in the engine for adjusting engine’s generated work. The COPoverall could be decreased by up to 19.4% at the off-design conditions due to the reduction of engine’s thermal efficiency as a result of decreasing the hot temperature or increasing the dead volume. Furthermore, increasing dead volume could have a up to 18.6% improvement of COPoverall compared to reducing the hot temperature. Moreover, an isothermal heat exchanger was also designed for improving the COPoverall. If the additional average pressure drop of each isothermal heat exchanger was lower than 30 kPa, the COP improvement of cooler could be 10% for heating and cooling.

中文翻译：

---

解耦双工斯特林机：概念设计和理论分析

摘要 本文描述了一种解耦双工斯特林机的概念设计。通过控制置换器和活塞在上死点或下死点处静止，置换器和共享活塞的运动被解耦。解耦双联斯特林机的整体性能系数（COPoverall）在冷却和加热方面分别达到 1.11-1.4 和 1.7-2.1。为满足发动机和冷却器在非设计工况下做功相等的约束，在发动机中采用了降低热温和增加死体积两种方法来调整发动机的发功。COPoverall 最多可以减少 19。由于降低热温或增加死体积导致发动机热效率降低，在非设计工况下为 4%。此外，与降低热温相比，增加死体积可使 COP 总体提高 18.6%。此外，还设计了等温换热器以提高 COP 整体。如果每个等温换热器的附加平均压降低于 30 kPa，则冷却器的 COP 改进可用于加热和冷却 10%。