Two-phase chamber modeling of a twin-screw expander for Trilateral Flash Cycle applications
Two-phase chamber modeling of a twin-screw expander for Trilateral Flash Cycle applications
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用于三边闪蒸循环应用的双螺杆膨胀机的两相室建模
DOI：
10.1016/j.egypro.2017.09.208
复制
发表时间：
2017
期刊：
影响因子：
--
通讯作者：
Bianchi G
中科院分区：
文献类型：
--
作者：
Bianchi G
低温（<100°C）物流具有最大的废热回收潜力，可能是可持续经济的一个有吸引力的机会。在已经提出的将这种废热转化为电能的底层热力学方法中，三边闪蒸循环（TFC）被证明在理论上能够从低温单相热源中回收比任何简单的朗肯循环更多的热量。然而，迄今为止，TFC回收单元的商业化由于缺乏应当以两相闪蒸流的高质量流率有效操作的膨胀机技术而受到阻碍。双螺杆技术是解决这些挑战的一个很有前途的候选者，这要归功于其正排量的性质和在高转速下运行而不会显着降低效率的能力。在目前的研究工作中，双螺杆膨胀机已经在商业软件GT-SUITE ™中建模。建模活动产生了基于守恒方程和REFPROP库耦合的两相腔室模型，以计算每个时间步长R245 fa工作流体的液-气混合物的热物理性质。使用预处理的几何数据，该模型包括泄漏路径的详细分解，并允许检索机器未来优化的关键信息，如指示图和质量角图。最后进行了参数分析，以评估在不同的操作条件下，即压力膨胀比，转速和入口品质的膨胀机的行为。
Low temperature (<100°C) streams have the largest share of waste heat recovery potential and may represent an attractive opportunity for a sustainable economy. Among the bottoming thermodynamic approaches that have been proposed to convert this waste heat into electricity, the Trilateral Flash Cycle (TFC) proved to be theoretically capable to recover more heat from a low-temperature single-phase heat source than any simple Rankine cycle. However, the commercialization of TFC recovery units has been so far prevented by the lack of an expander technology that should efficiently operate with high mass flow rates of a two-phase flashing flow. A promising candidate to tackle these challenges is the twin-screw technology thanks to its positive displacement nature and the capability to run at high revolution speeds without remarkable efficiency drops.In the current research work, a twin-screw expander has been modeled in the commercial software GT-SUITE™. The modeling activity resulted in a two-phase chamber model based on the coupling of the conservation equations and the REFPROP library to calculate the thermophysical properties of the liquid-vapor mixture of the R245fa working fluid at each time step. Using pre-processed geometrical data, the model includes a detailed breakdown of the leakage paths and allows to retrieve key information for a future optimization of the machine such as the indicator diagram and the quality-angle diagram. Parametric analyses were eventually carried out to assess the expander behavior at different operating conditions, namely manometric expansion ratio, revolution speed and inlet quality.
DOI：
10.1243/pime_proc_1993_207_032_02
发表时间：
1993-01-01
影响因子：
1.7
作者：
SMITH, IK
通讯作者：
SMITH, IK
三边闪蒸循环中螺杆膨胀机的热力学建模
DOI：
--
发表时间：
2016
期刊：
影响因子：
--
作者：
H. Vasuthevan;A. Brümmer
通讯作者：
A. Brümmer