The particular aspect of this work is the new approach to expander design procedure for small rated ORC. In fact, once all the calculation procedures have been defined, they have been implemented in Matlab code. This code, once the design process is complete, provides an indication of the optimal expander configuration to adopting to that specific system. For these reasons, this paper aims to analyze all the preliminary expanders' design procedures, both dynamic and volumetric. The reasons lie in the development of low‐enthalpy heat recovery systems (systems that allow simultaneous production of electrical and thermal energy made available in the form of water at a temperature of 60‐90°C), with the aim of optimizing any energy system. Within these energy systems, the expander is the main component, responsible for power generation. It is, therefore, necessary and useful to analyze in detail every expander configuration, highlighting the different features. For each component will be described the theory on which is based the choice and its design and a possible software implementation is supplied. Finally, a criterion for the choice of the optimal expander is proposed, based on some operational considerations and other construction and structural constraints, such as overall dimensions and weight, lubrication, MTBF, feasibility, reliability, and coupling with the electric generator.

中文翻译：

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小型额定有机朗肯循环系统的膨胀机设计程序和选择标准

这项工作的特定方面是用于小额定ORC的扩展器设计程序的新方法。实际上，一旦定义了所有计算过程，就可以用Matlab代码实现它们。设计过程完成后，此代码将指示要针对该特定系统采用的最佳扩展器配置。由于这些原因，本文旨在分析所有初步扩展器的设计程序，包括动态和体积设计。原因在于开发低焓的热回收系统（该系统允许同时生产电能和热能，并在60-90°C的温度下以水的形式提供电能），目的是优化任何能源系统。在这些能源系统中，膨胀器是主要组件，负责发电。它是，因此，详细分析每种扩展器的配置（突出显示不同的功能）是必要且有用的。将为每个组件描述选择的基础理论，选择及其设计以及可能的软件实现。最后，基于一些操作上的考虑以及其他结构和结构约束，例如总体尺寸和重量，润滑，MTBF，可行性，可靠性以及与发电机的耦合，提出了最佳膨胀机的选择标准。