Thermodynamic analysis and optimization of a flash-binary geothermal power generation system

Wang, Jianyong; Dai, Yiping; Zhao, Pan

doi:10.1016/j.geothermics.2015.01.012

Cited by 112 publications

(38 citation statements)

References 22 publications

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“…Thermodynamic properties calculated for 6 different refrigerants and waste heat (reinjected geothermal fluid) are shown in Tables (9)(10)(11)(12)(13)(14) to generate 2.5 MWe of electricity depending upon the selected dead state properties.…”

Section: Waste Heat Recovery and Optimization Analysis Resultsmentioning

confidence: 99%

“…Energy and exergy efficiencies for each refrigerant is shown in Figure 11 according to the thermodynamic properties calculated in Tables (9)(10)(11)(12)(13)(14) for the model discussed.…”

Section: Waste Heat Recovery and Optimization Analysis Resultsmentioning

confidence: 99%

“…The calina cycle is suitable for reservoir temperatures below 1208C and is available in the cycles using waste heat (1208C-2008C). In such cycles, ammonia and water mixture are used [9][10][11][12][13][14][15][16]. Power plants using these cycles as well as the reclamation of the existing geothermal reservoirs have been an important research topic.…”

Section: Introductionmentioning

confidence: 99%

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Thermodynamic analysis and performance improvement of Irem geothermal power plant in Turkey: A case study of organic Rankine cycle

Ünverdi

Çerçi

2017

Env Prog and Sustain Energy

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Renewable and environmentally friendly energy sources are becoming increasingly important nowadays. This growth in importance also has an effect on the energy conversion systems using more eco‐friendly and renewable energy sources (geothermal, wind, solar) than fossil fuels, the use of which has been reduced these days (oil, coal, natural gas, etc.). From this perspective, renewable energy sources and the conversion efficiency of the facilities which use these sources have also gained importance. The purpose of this study is to calculate the energy and exergy efficiency of the Irem binary cycle geothermal power plant located in Germencik‐Aydın, Turkey geothermal area. Data measured in the power plant were used in the calculations, and correlations were developed depending on the ambient temperature. In addition, exergoeconomic analysis was performed by taking into account the total cost of the power plant (investment and maintenance costs). The greatest energy (97,805.34 kW) and exergy (6463.8 kW) losses were observed in the air‐cooled condenser. The first law efficiency and the second law efficiency of the power plant were found to be 5.89% and 33.8%, respectively. Furthermore, a model was proposed for 6 different refrigerants with the purpose of investigating the availability of the waste heat and consists of a numerical thermodynamic optimization of the model in this study. © 2017 American Institute of Chemical Engineers Environ Prog, 37: 1523–1539, 2018

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Section: Waste Heat Recovery and Optimization Analysis Resultsmentioning

confidence: 99%

“…Energy and exergy efficiencies for each refrigerant is shown in Figure 11 according to the thermodynamic properties calculated in Tables (9)(10)(11)(12)(13)(14) for the model discussed.…”

Section: Waste Heat Recovery and Optimization Analysis Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Thermodynamic analysis and performance improvement of Irem geothermal power plant in Turkey: A case study of organic Rankine cycle

Ünverdi

Çerçi

2017

Env Prog and Sustain Energy

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“…Also additional flashing of geothermal brine could increase total power output up to 35% (Chamorro et al 2012). Although utilization of binary cycle combined with single flash is considered to be more suitable where additional flashing of geothermal brine is limited due to silica scaling (Wang et al 2015). More recent methods focused on hybrid utilization scenarios which make it possible to superheat geothermal steam with heat sources like solar or fossil fuels (Zhou 2014), (Bidini et al 1998).…”

Section: Introductionmentioning

confidence: 99%

Energetic and exergetic Improvement of geothermal single flash cycle

Nazari

Porkhial

2016

Int. J. Renew. Energy Dev.

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This paper presents a detailed analysis of a new method for improving energetic and exergetic efficiencies of single flash cycle. The thermodynamic process of the new method consists of extracting a fraction of hot wellhead geothermal brine for the purpose of superheating saturated steam entering the turbine. Computer programming scripts were developed and optimized based on mathematical proposed models for the different components of the systems. The operating parameters such as separator temperature, geofluid wellhead enthalpy and geothermal source temperature are varied to investigate their effects on both net power output and turbine exhaust quality of the systems. Also, full exergy assessment was performed for the new design. The results of separator temperature optimization revealed that specific net power output of the new design can be boosted up to 8% and turbine exhaust quality can be diminished up to 50% as compared to common single flash cycle. In addition, for wells with higher discharge enthalpy, superheating process improve specific net power output even up to 10%. Finally, it was observed that the overall system exergy efficiency was approximately raised 3%. Article History: Received January 5th 2016; Received in revised form June 25th 2016; Accepted July 3rd 2016; Available onlineHow to Cite This Article: Nazari, N. and Porkhial, S. (2016). Energetic and Exergetic Improvement of Geothermal Single Flash Cycle. Int. Journal of Renewable Energy Development, 5(2),129-138.http://dx.doi.org/10.14710/ijred.5.2.129-138

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“…Their study showed that the new designs could increase the specific output of the plant by about 5%. Wang et al [19] utilized a Kalina cycle to recover the heat of geothermal water from a flash geothermal power plant. Their analysis showed that there existed optimum flash pressure, ammonia-water turbine inlet pressure and temperature, corresponding to the maximum system exergy efficiency.…”

Section: Introductionmentioning

confidence: 99%

A Selection Method for Power Generation Plants Used for Enhanced Geothermal Systems (EGS)

Zhu

Zhang

et al. 2016

Energies

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Abstract:As a promising and advanced technology, enhanced geothermal systems (EGS) can be used to generate electricity using deep geothermal energy. In order to better utilize the EGS to produce electricity, power cycles' selection maps are generated for people to choose the best system based on the geofluids' temperature and dryness conditions. Optimizations on double-flash system (DF), flash-organic Rankine cycle system (FORC), and double-flash-organic Rankine cycle system (DFORC) are carried out, and the single-flash (SF) system is set as a reference system. The results indicate that each upgraded system (DF, FORC, and DFORC) can produce more net power output compared with the SF system and can reach a maximum net power output under a given geofluid condition. For an organic Rankine cycle (ORC) using R245fa as working fluid, the generated selection maps indicate that using the FORC system can produce more power than using other power cycles when the heat source temperature is below 170˝C. Either DF or DFORC systems could be an option if the heat source temperature is above 170˝C, but the DF system is more attractive under a relatively lower geofluid's dryness and a higher temperature condition.

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Thermodynamic analysis and optimization of a flash-binary geothermal power generation system

Cited by 112 publications

References 22 publications

Thermodynamic analysis and performance improvement of Irem geothermal power plant in Turkey: A case study of organic Rankine cycle

Thermodynamic analysis and performance improvement of Irem geothermal power plant in Turkey: A case study of organic Rankine cycle

Energetic and exergetic Improvement of geothermal single flash cycle

A Selection Method for Power Generation Plants Used for Enhanced Geothermal Systems (EGS)

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