Fluids and parameters optimization for a novel cogeneration system driven by low-temperature geothermal sources
Fluids and parameters optimization for a novel cogeneration system driven by low-temperature geothermal sources
复制标题
低温地热源驱动的新型热电联产系统的流体和参数优化
DOI：
10.1016/j.energy.2011.02.005
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发表时间：
2011-05-01
期刊：
影响因子：
9
通讯作者：
Zhang, S. J.
中科院分区：
文献类型：
--
作者：
Guo, T.;Wang, H. X.;Zhang, S. J.
提出了一种新型热电联产系统并进行了技术经济研究，该系统由低温地热驱动的有机朗肯循环（ORC）子系统、中间换热器子系统和热泵子系统组成。主要目的是为基于 ORC 的发电子系统确定合适的工作流体（沸点温度范围为 -47.69 至 47.59 摄氏度的 27 种流体）和优化的循环参数。筛选标准包括热源单位质量流量的净功率输出（P-net）、总传热面积与净功率输出的比率（A/W-net）以及发电成本（epc）。结果表明，存在使 P-net 值最大化和 A/P-net 和 epc 值最小化的最佳蒸发温度。最佳温度随筛选标准和流体的不同而变化。基于每个筛选标准的优化流体并不相同。 E170、R600 和 R141b 显示最低的 A/W-net 和 epc 值，而 P-net 值比呈现最大 P-net 值的 R236ea 平均低 3.78%。 (C) 2011 Elsevier Ltd. 保留所有权利。
A novel cogeneration system was proposed and techno-economically investigated, consisting of a low-temperature geothermally-powered organic Rankine cycle (ORC) subsystem, an intermediate heat exchanger subsystem and a heat pump subsystem. The main purpose is to identify suitable working fluids (among 27 fluids with boiling point temperature ranging from -47.69 to 47.59 degrees C) and optimized cycle parameters for the ORC-based power generation subsystem. The screening criteria include net power output per unit mass flow rate of hot source (P-net), the ratio of total heat transfer area to net power output (A/W-net), and electricity production cost (epc). Results show that there exists optimum evaporating temperatures maximizing the P-net value and minimizing the A/P-net and epc values. The optimum temperatures vary with different screening criteria and fluids. Optimized fluids based on each screening criteria are not the same. E170, R600 and R141b show the lowest A/W-net and epc values with averagely 3.78% lower P-net value than R236ea which presents the largest P-net value. (C) 2011 Elsevier Ltd. All rights reserved.