Experimental study on an open-drive scroll expander integrated into an ORC (Organic Rankine Cycle) system with R245fa as working fluid
Experimental study on an open-drive scroll expander integrated into an ORC (Organic Rankine Cycle) system with R245fa as working fluid
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DOI：
10.1016/j.energy.2013.04.003
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发表时间：
2013-06
期刊：
影响因子：
9
通讯作者：
S. Declaye;S. Quoilin;L. Guillaume;V. Lemort
中科院分区：
文献类型：
--
作者：
S. Declaye;S. Quoilin;L. Guillaume;V. Lemort
本文重点介绍使用 R245fa 作为工作流体集成到有机朗肯循环中的开式驱动涡旋膨胀机的实验特性。膨胀机是一种市售空气压缩机，经过修改以在膨胀机模式下运行。 ORC（有机朗肯循环）系统的设计标称热输入为 20 kW，标称净功率输出为 1.8 kW。总共测量了 74 个稳态工作点，以评估扩展器在各种条件下的性能。变化的操作参数包括入口压力（从 9 到 12 bar）、出口压力（从 1.5 到 4 bar）和转速（从 2000 到 3500 rpm）。最大等熵效率和轴功率分别为 75.7% 和 2.1 kW。蒸发温度和冷凝温度分别为 97.5 °C 和 26.6 °C 时，最大循环效率可达 8.5%。对于大多数测试，热水是在冷凝器中产生的，因此系统表现为 CHP（热电联产）。根据水温要求，电热比在 1.9% 至 11.8% 之间变化。可以生产超过 50°C 的水，电热比高于 8%。然后使用实验数据点生成扩展器的性能图。该性能图允许模拟在其他 ORC 系统中使用此类扩展器。
The present paper focuses on the experimental characterization of an open-drive scroll expander integrated into an Organic Rankine cycle using R245fa as working fluid. The expander is a commercially available air compressor that was modified to operate in expander mode. The ORC (Organic Rankine Cycle) system is designed for a nominal heat input of 20 kW and a nominal net power output of 1.8 kW. A total of 74 steady-state operating points are measured to evaluate the expander performance over a wide range of conditions. The operating parameters that are varied include the inlet pressure (from 9 to 12 bar), outlet pressure (from 1.5 to 4 bar) and rotational speed (from 2000 to 3500 rpm). The maximum isentropic efficiency and shaft power are, respectively, 75.7% and 2.1 kW. A maximum cycle efficiency of 8.5% is reached for evaporating and condensing temperatures of 97.5 °C and 26.6 °C respectively. For most of the tests, hot water is produced in the condenser and the system therefore behaves as a CHP (combined heat and power). Depending on the water temperature requirement, a power to heat ratio varying between 1.9% and 11.8% is obtained. Water over 50 °C can be produced with a power to heat ratio higher than 8%. The experimental data points are then used to generate a performance map of the expander. This performance map allows for simulation of the use of such an expander in other ORC system.