A novel design approach for small scale low enthalpy binary geothermal power plants

Gabbrielli, Roberto

doi:10.1016/j.enconman.2012.04.017

Cited by 85 publications

(27 citation statements)

References 24 publications

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“…However, the size of the ORC components was not optimized regarding the operation in a wide range of operating conditions. Another study dealt with power plant sizing, taking into consideration wellhead temperature decline during operation, but the control was not optimized [8]. The system is thereby a supercritical ORC with variable speed pump, constant turbine-nozzle and constant fan-speed.…”

Section: Open Accessmentioning

confidence: 99%

Thermal-Economic Modularization of Small, Organic Rankine Cycle Power Plants for Mid-Enthalpy Geothermal Fields

2014

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Abstract:The costs of the surface infrastructure in mid-enthalpy geothermal power systems, especially in remote areas, could be reduced by using small, modular Organic Rankine Cycle (ORC) power plants. Thermal-economic criteria have been devised to standardize ORC plant dimensions for such applications. We designed a modular ORC to utilize various wellhead temperatures (120-170 °C), mass flow rates and ambient temperatures (−10-40 °C). A control strategy was developed using steady-state optimization, in order to maximize net power production at off-design conditions. Optimum component sizes were determined using specific investment cost (SIC) minimization and mean cashflow (MCF) maximization for three different climate scenarios. Minimizing SIC did not yield significant benefits, but MCF proved to be a much better optimization function.

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Section: Open Accessmentioning

confidence: 99%

Thermal-Economic Modularization of Small, Organic Rankine Cycle Power Plants for Mid-Enthalpy Geothermal Fields

2014

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“…In 2011, Tchanche et al [2] reviewed the conversion of low-grade heat into power in various ORC application studies. Similar topics have been investigated to determine the potential applications of ORC systems, such as binary geothermal power plants [3], hybrid solar-and gas-driven systems [4], waste heat recovery [5], and biomass power plants [6].…”

Section: Introductionmentioning

confidence: 99%

Design and preliminary results of a 20-kW transcritical organic Rankine cycle with a screw expander for low-grade waste heat recovery

Hsieh

Wang

et al. 2017

Applied Thermal Engineering

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“…The regenerator cannot always enhance the thermodynamic performance of ORC at the expense of higher cost [25,27]. In addition, the regenerator can bring operative problems when geothermal water temperature is low under off-design conditions [13]. Therefore, the regenerator is not considered in this work.…”

Section: Thermodynamic Parameter Optimization On the Design Conditionmentioning

confidence: 99%

“…In view of the thermal degradation of geothermal resources, Gabbrielli [13] developed a detailed supercritical ORC off-design performance model to determine the optimal design parameters. The expander operated in sliding pressure mode with constant nozzle area to satisfy various operation conditions.…”

Section: Introductionmentioning

confidence: 99%

Off-Design Performances of Subcritical and Supercritical Organic Rankine Cycles in Geothermal Power Systems under an Optimal Control Strategy

Gao

Liu

2017

Energies

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Abstract:The conditions of heat source and heat sink in a geothermal ORC system may frequently vary due to variations in geological conditions, ambient temperature and actual operation. In this study, an off-design performance prediction model for geothermal ORC systems is developed according to special designs of critical components, and an optimal control strategy which regards the turbine guide vane angle, the refrigerant pump rotational speed and the cooling water mass flow rate as control variables is proposed to maximize the net power output. Off-design performances of both subcritical and supercritical ORCs are analyzed. The results indicate that, under the optimal control strategy, the net power output of both ORCs increase with greater geothermal water mass flow rate, higher geothermal water inlet temperature and lower cooling water inlet temperature, which is mainly due to a greater working fluid mass flow rate, higher turbine inlet pressure and lower condensing pressure, respectively. The net power output of supercritical ORC is always greater than that of subcritical ORC within the range of this study, but the difference tends to decrease when supercritical ORC activates the geothermal water reinjection temperature restriction.

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A novel design approach for small scale low enthalpy binary geothermal power plants

Cited by 85 publications

References 24 publications

Thermal-Economic Modularization of Small, Organic Rankine Cycle Power Plants for Mid-Enthalpy Geothermal Fields

Thermal-Economic Modularization of Small, Organic Rankine Cycle Power Plants for Mid-Enthalpy Geothermal Fields

Design and preliminary results of a 20-kW transcritical organic Rankine cycle with a screw expander for low-grade waste heat recovery

Off-Design Performances of Subcritical and Supercritical Organic Rankine Cycles in Geothermal Power Systems under an Optimal Control Strategy

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