An Improved Analysis Method for Organic Rankine Cycles Based on Radial-Inflow Turbine Efficiency Prediction

Li, Peng; Han, Zhonghe; Jia, Xiaoqiang; Mei, Zhongkai; Han, Xu; Wang, Zhi

doi:10.3390/app9010049

Cited by 4 publications

(5 citation statements)

References 31 publications

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“…To this purpose, the energy content of the organic fluid at the exit of the turbine is exploited (4-4*) to preheat the liquid before the entrance in the evaporator (2-2*). Specifically, centrifugal pumps, radial turbine and shell and tube heat exchangers were selected, according to the literature [19,[88][89][90]. Figure 2b The performances of the geothermal-driven ORC were characterised by adopting a thermodynamic model developed by the authors in the last years [16,29,91].…”

Section: Organic Rankine Cycle (Orc) Unitmentioning

confidence: 99%

“…where p j is the operating pressure. The coefficients b 1,j , b 2,j , c 1,j , c 2,j , c 3,j and the material factors F M,j are shown in Table 2 [19,[88][89][90].…”

Section: Economic Analysismentioning

confidence: 99%

“…where the corresponding bare module factor F BM is in Table 2 [19,[88][89][90]. Finally, the total cost (in euro) of the integrated geothermal system was calculated according to the following equation:…”

Section: Economic Analysismentioning

confidence: 99%

“…In this context, binary organic Ranking cycles (ORCs) play a crucial role [10,[16][17][18]. ORCs represent an attractive and flexible technology for small applications owing to their capability to convert low enthalpy heat sources (i.e., waste heat [19][20][21][22][23] and renewable sources [24][25][26]) to electricity. Specifically, lower maintenance costs, better partial load performance, faster start-up and stop procedures, and higher safety and lifetime (up to 30 years) with respect to conventional installations are guaranteed [7,27].…”

Section: Introductionmentioning

confidence: 99%

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Integrated Geothermal Energy Systems for Small-Scale Combined Heat and Power Production: Energy and Economic Investigation

Morrone

Algieri

2020

Applied Sciences

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In recent years, an increasing interest in geothermal energy has been registered in both the scientific community and industry. The present work aims to analyse the energy performance and the economic viability of an innovative high-efficiency geothermal-driven integrated system for a combined heat and power (CHP) application. The system consists of a heat exchanger (HEX) and a transcritical organic Rankine cycle (ORC) that work in parallel to exploit a high-temperature geothermal source (230 °C) and satisfy the energy demand of a commercial centre located in Southern Italy. The ORC and HEX sub-units can operate at partial load to increase the system flexibility and to properly react to continuous changes in energy request. A lumped model was developed to find the proper operating conditions and to evaluate the energy production on an hourly basis over the whole year. In particular, a multi-variable optimisation was implemented to find the most suitable configuration and a 101.4 kWel ORC was selected while the HEX nominal power was 249.5 kWth. The economic viability of the integrated system was evaluated in terms of net present value and payback period and different operating strategies were compared: thermal-driven, electric-driven, and a mixed strategy. The latter turned out to be the best solution according to both energy and economic criteria, with electric and thermal self-consumptions larger than 90%, with no heat dumping and a payback time close to five years.

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Section: Organic Rankine Cycle (Orc) Unitmentioning

confidence: 99%

“…where p j is the operating pressure. The coefficients b 1,j , b 2,j , c 1,j , c 2,j , c 3,j and the material factors F M,j are shown in Table 2 [19,[88][89][90].…”

Section: Economic Analysismentioning

confidence: 99%

Section: Economic Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Integrated Geothermal Energy Systems for Small-Scale Combined Heat and Power Production: Energy and Economic Investigation

Morrone

Algieri

2020

Applied Sciences

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“…Li et al designed a predicted method for the efficiency of a radial-inflow turbine and compared with a constant turbine efficiency method. The results indicated the system performances of these two different methods were different evidently [39]. Although several investigations were performed with regard to the dynamic performance of an ORC operating together with an ICE, most of them employed a scroll expander or a turbine.…”

Section: Introductionmentioning

confidence: 98%

Operation Characteristics and Transient Simulation of an ICE-ORC Combined System

et al. 2019

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Currently, internal combustion engines (ICEs) are still the main power for transportation. Energy conservation and emission reduction for ICEs have become the driving force of the industrial R&D in recent years. Organic Rankine cycle (ORC) is a feasible technology to recover the waste heat of an ICE so that the energy efficiency can be enhanced apparently. However, there are still many obstacles needed to be overcome for the application of an ORC together with an ICE. When a vehicle is driving, the operation conditions of the ICE vary in a large range. The operation of the ORC needs to be regulated accordingly to achieve maximum efficiency. In this study, the operation characteristics of an ICE-ORC combined system is investigated and the transient performance is analyzed. First, an integrated simulation model of the ICE and the ORC was built in GT-POWER software. A 5 kW single-screw expander was employed for the ORC system. The working characteristics of the ORC system were evaluated under various working conditions of the ICE. The matching principles of the ORC with the ICE were discussed and the optimal operation conditions of the ORC over the entire engine’s working range were obtained. Subsequently, a feedforward control strategy for the ORC system was designed in MATLAB/SIMULINK. Finally, the entire model was simulated under a transient driving cycle of a vehicle. The results indicate that the pump speed and the expander speed are two important parameters and must be adjusted according to the engine’s working condition. The speed of the single-screw expander maintains in the low-speed region and the pump speed is tuned to achieve a high evaporation pressure and a proper superheat degree of the working fluid at the inlet of the expander. Thus, the net power output can be maximized. The designed feedforward control strategy can adjust the working condition of the ORC automatically to match with the working condition of the ICE. The ORC operates intermittently and an impulse power is output under the urban driving conditions. However, the working time of the ORC is increased significantly and the power output is relatively higher under the highway conditions.

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Thermodynamic analysis and optimization of organic Rankine cycles based on radial-inflow turbine design

Gao

et al. 2021

Applied Thermal Engineering

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An Improved Analysis Method for Organic Rankine Cycles Based on Radial-Inflow Turbine Efficiency Prediction

Cited by 4 publications

References 31 publications

Integrated Geothermal Energy Systems for Small-Scale Combined Heat and Power Production: Energy and Economic Investigation

Integrated Geothermal Energy Systems for Small-Scale Combined Heat and Power Production: Energy and Economic Investigation

Operation Characteristics and Transient Simulation of an ICE-ORC Combined System

Thermodynamic analysis and optimization of organic Rankine cycles based on radial-inflow turbine design

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