An Organic Rankine Cycle off-design model for the search of the optimal control strategy

被引:164
作者
Manente, Giovanni [1 ]
Toffolo, Andrea [2 ]
Lazzaretto, Andrea [1 ]
Paci, Marco [3 ]
机构
[1] Univ Padua, Dept Ind Engn, I-35131 Padua, Italy
[2] Lulea Univ Technol, Energy Sci Div, Dept Engn Sci & Math, S-97187 Lulea, Sweden
[3] ENEL Engn & Innovat, I-56126 Pisa, Italy
关键词
Organic Rankine Cycle; Off-design; Dynamic model; Control strategy; WASTE HEAT-RECOVERY; OPTIMIZATION; ORC;
D O I
10.1016/j.energy.2012.12.035
中图分类号
O414.1 [热力学];
学科分类号
摘要
Power generation from low enthalpy geothermal resources using Organic Rankine Cycle systems is markedly influenced by the temperature level of the heat source and heat sink. During plant operation the actual temperature of the geofluid may be different from the value assumed in the design phase. In addition, the seasonal and daily variations of the ambient temperature greatly affect the power output especially when a dry condensation system is used. This paper presents a detailed off-design model of an Organic Rankine Cycle that includes the performance curves of the main plant components. Two capacitive components in the model have the key function of damping the temporary disequilibrium of mass and energy inside the system. Isobutane and R134a are considered as working fluids, mainly operating in subcritical and supercritical cycles, respectively. The off-design model is used to find the optimal operating parameters that maximize the electricity production in response to changes of the ambient temperatures between 0 and 30 degrees C and geofluid temperatures between 130 and 180 degrees C. This optimal operation strategy can be conveniently applied both to already existing plants and to the choice of new design plant configurations. (C) 2013 Elsevier Ltd. All rights reserved.
引用
收藏
页码:97 / 106
页数:10
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