Parametric optimization of organic Rankine cycle using TOPSIS integrated with entropy weight method

Tiwari, Deepak; Sherwani, Ahmad Faizan; Muqeem, Mohd; Goyal, Ashwni

doi:10.1080/15567036.2019.1649755

Cited by 20 publications

(13 citation statements)

References 32 publications

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“…Unfortunately, no single pure fluid possesses all of the characteristics mentioned earlier. The use of zeotropic mixtures instead of pure fluids can solve these issues 15,30 . For example, flammability of hydrocarbons such as propane, butane can be suppressed by mixing it with an inflammable working fluid such as R245fa 15 .…”

Section: Description Of Systemsmentioning

confidence: 99%

“…For example, flammability of hydrocarbons such as propane, butane can be suppressed by mixing it with an inflammable working fluid such as R245fa 15 . Further, zeotropic mixtures have temperature glide in heat exchangers, which reduces irreversibilities during the heat exchange process thereby increasing the thermal performance of the system 30,31 . Numerous researches have been conducted on the selection of suitable working fluid for ORC based systems.…”

Section: Description Of Systemsmentioning

confidence: 99%

“…Moreover, single fluid ORC-VCR system offers several other benefits over dual one such as direct coupling of the expander with the compressor to minimize mechanical losses; conversion of expander work into electricity when cooling is not needed; use of same working fluid both in ORC and VCR sub-cycles. 15,18 Therefore, single fluid ORC-VCR systems have gained attention lately among researchers. A comprehensive literature review on the ORC-VCR system employing single fluid in both ORC and VCR sub-cycles is given in Table 1.…”

Section: Introductionmentioning

confidence: 99%

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Thermodynamic analysis of simple and modified organic Rankine cycle and vapor compression refrigeration (ORC–VCR) systems

Ashwni

Sherwani

Tiwari

2020

Env Prog and Sustain Energy

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This paper compares the thermodynamic performance of two ORC–VCR systems using the zeotropic mixture (Hexane/R245fa); one is a simple ORC–VCR system whereas the second one is a modified ORC–VCR system. Both ORC–VCR systems are different in terms of VCR sub‐cycle. The modified ORC–VCR system contains an additional flash tank, expansion valve, and compressor compared to the simple ORC–VCR system in the VCR sub‐cycle. The thermodynamic performance of the systems have been evaluated in terms of Cooling capacity (Qevap), Coefficient of performance of the system (COPs), exergetic efficiency (ηex), and cost function (UAtot) . Modified ORC–VCR system exhibits 23.4, 23.4, 29.00, and 41% enhancement in cooling capacity (Qevap), COPs, exergetic efficiency (ηex), and cost function (UAtot), respectively, compared to the simple system. Moreover, there is 4, 5, and 84.73% enhancement in Qevap at the mass fraction of 0.9, COPs at the mass fraction of 0.6, and ηex at the mass fraction of 0.5 for the modified ORC–VCR system with the use of the zeotropic mixture.

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Section: Description Of Systemsmentioning

confidence: 99%

Section: Description Of Systemsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Thermodynamic analysis of simple and modified organic Rankine cycle and vapor compression refrigeration (ORC–VCR) systems

Ashwni

Sherwani

Tiwari

2020

Env Prog and Sustain Energy

Self Cite

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“…Rimistidt and Barnes provide a method to calculate k+ and K as a function of the geothermal fluid temperature [36]. The forward rate constant k+ and the equilibrium constant are given by: logK=a1+b1T+c1/T, (5) logk+=(a1+a2)+b1T+(c1+c2)/T. (6) Rimistidt and Barnes provide the a1, a2, b1, c1, c2 which is shown in Table 1.…”

Section: Prediction Of the Silica Depositionmentioning

confidence: 99%

“…For the low to medium temperature geothermal resources in the range of 90 o C to 300 o C, from the thermodynamic points of view, the efficiency of these kinds of geothermal power plants are capped by the temperature of geothermal fluid entering geothermal power plants [4]. On the other hand, fossil fuel power plant is presently the backbone of the electricity production, which has a better efficiency as the combustion temperature is much higher [5]. Therefore, a hybrid power plant, integrating geothermal energy into fossil fired power plants, is a practical way to efficiently use geothermal energy and reduce emission from electricity production [6].…”

Section: Introductionmentioning

confidence: 99%

Optimisation of displacement selections and structures for the Geothermal Aided Power Generation plant

Zhou

Qin

2020

Preprint

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Geothermal Aided Power Generation (GAPG) technology is a method of integrating geothermal energy into a regenerative Rankine cycle (RRC) power plant. In such a power system, the geothermal energy is used to preheat the feedwater to boiler of the power plant. Therefore, the extraction steam of RRC power plant is displaced by the geothermal energy. Then, the displaced extraction steam is expended further in steam turbine to produce power. In a GAPG plant, a heat exchanger system is used to facilitate the heat exchange between the geothermal fluid and the feedwater. As power from geothermal energy comes from displaced extraction steam, different displacement selections for extraction steam would lead to different technical performance of the GAPG plant. When the geothermal fluid flows up from the geothermal well and quench to a lower temperature in the heat exchanger system, the silica scaling occurs in the heat exchanger system. As silica scaling can be controlled by adjusting geothermal fluid temperature, different displacement selections would have different influences on the silica scaling process in the heat exchanger system. There are two kinds of structures for the heat exchanger system of the GAPG plant, which are series structure and parallel structure. The different structures also lead to different performance of the GAPG plant. In present paper, a 300 MW GAPG plant is used as a case study to optimise displacement selections and structures of the GAPG plant. The results show that there is no silica scaling in the heat exchanger system for the displacement selection of geothermal energy to displace extraction to all high-pressure feedwater heaters. For this displacement selection, the power output of the Parallel GAPG plant is higher than the Series GAPG plant.

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The anti-fatigue lightweight design of heavy tractor frame based on a modified decision method

Zhang

Wang

Kong

et al. 2022

Struct Multidisc Optim

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Parametric optimization of organic Rankine cycle using TOPSIS integrated with entropy weight method

Cited by 20 publications

References 32 publications

Thermodynamic analysis of simple and modified organic Rankine cycle and vapor compression refrigeration (ORC–VCR) systems

Thermodynamic analysis of simple and modified organic Rankine cycle and vapor compression refrigeration (ORC–VCR) systems

Optimisation of displacement selections and structures for the Geothermal Aided Power Generation plant

The anti-fatigue lightweight design of heavy tractor frame based on a modified decision method

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