Recuperated power cycle analysis model: Investigation and optimisation of low-to-moderate resource temperature Organic Rankine Cycles

被引:12
作者
Ventura, Carlos A. de M. [1 ]
Rowlands, Andrew S. [1 ]
机构
[1] Univ Queensland, Sch Mech & Min Engn, Brisbane, Qld, Australia
关键词
ORC (Organic Rankine Cycle); Power cycle design and optimisation; Recuperated power cycle; Renewable power generation applications; WASTE HEAT-RECOVERY; LOW-GRADE HEAT; FLUID SELECTION; WORKING FLUIDS; GEOTHERMAL SOURCES; ORC; PLANTS; EXPLOITATION; GENERATION; PART;
D O I
10.1016/j.energy.2015.09.055
中图分类号
O414.1 [热力学];
学科分类号
摘要
A numerical model for recuperated power cycles for renewable power applications is described in the present paper. The original code was written in Python and results for a wide range of working fluids and operating point conditions are presented. Here, the model is applied to subcritical and transcritical Rankine cycles. It comprises a brute-force search algorithm that covers a wide parametric study combining working fluid, resource and cooling temperatures as well as high-side pressures in order to ascertain the best working fluid for a given resource temperature and operating point. The present study determined the fluids that maximise the specific energy production from a hot stream for a range of low-to-medium temperature (100-250 degrees C) resources. This study shows that for the following resource temperatures: 100 degrees C, 120 degrees C, 150 degrees C, 180 degrees C and 210 degrees C, R125, R143a, RC318, R236ea and R152a were found to maximise specific energy production, respectively. In general, the inclusion of a recuperator within the power cycle results in greater specific energy production for a given operating temperature. However, it was found that for all fluids there was a threshold pressure above which the inclusion of a recuperator did not enhance system performance. This may have design and economic ramifications when designing next-generation transcritical and supercritical power cycles. (C) 2015 Elsevier Ltd. All rights reserved.
引用
收藏
页码:484 / 494
页数:11
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