Numerical investigations of a Trilateral Flash Cycle under system off-design operating conditions

Energy Procedia Pub Date : 2019-03-01 DOI:10.1016/j.egypro.2019.02.070

Matteo Marchionni , Giuseppe Bianchi , Savvas A. Tassou , Obadah Zaher , Jeremy Miller

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引用次数: 4

Abstract

The current research presents a comprehensive model of a 100 kWe Trilateral Flash Cycle TFC system composed of sub-modules for the plate heat exchangers and twin-screw expanders to assess and identify the operating parameters that mostly affect the TFC performance at off-design conditions. The modelling approach for heat exchangers and piping is based on 1D CFD while considering the operating maps for pump and expander. The simulation process takes into account variations of the heat source temperature and mass flow rate from the design point. The TFC performance is analysed in terms of efficiency and power output while the expander performance is discussed in terms of volumetric and isentropic efficiencies. A sensitivity analysis is carried out to assess the most suitable parameter for control purposes and system performance optimisation. The results point out a large sensitivity of the inlet quality at the expander due to the revolution speed of the machine but also the off-design behaviour of the heater.

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系统非设计工况下三边闪蒸循环数值研究

本研究提出了一个由板式换热器和双螺杆膨胀器子模块组成的100 kWe三边闪蒸循环TFC系统的综合模型，以评估和识别非设计条件下影响TFC性能的主要操作参数。换热器和管道的建模方法基于一维CFD，同时考虑了泵和膨胀器的工作图。从设计点开始，模拟过程中考虑了热源温度和质量流量的变化。从效率和功率输出两方面分析了TFC的性能，从体积效率和等熵效率两方面讨论了膨胀器的性能。进行灵敏度分析以评估最适合控制目的和系统性能优化的参数。结果指出，由于机器的转速以及加热器的非设计行为，膨胀机的进口质量具有很大的敏感性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Energy Procedia

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