Entropy, exergy, and cost analyses of solar driven cogeneration systems using supercritical CO2 Brayton cycles and MEE-TVC desalination system

Kouta, Amine; Al‐Sulaiman, Fahad A.; Atif, Maimoon; Marshad, Saud Bin

doi:10.1016/j.enconman.2016.02.021

Cited by 71 publications

(16 citation statements)

References 35 publications

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“…The main factor to the process is the mount of high-pressure steam used in the evaporation system. The higher the mount of high-pressure steam is utilized, the greater the temperature of the mixed steam and heating load of the ejection [26]. So the preheat temperature of the feed is higher, the low-pressure steam consumed by the 1-effect evaporator is less.…”

Section: Double-effect Evaporation Crystallization Processmentioning

confidence: 99%

Energy Saving Research on Multi-effect Evaporation Crystallization Process of Bittern Based on MVR and TVR Heat Pump Technology

Yang¹,

Leng²,

Li³

et al. 2020

AJCHE

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This work keeps an eye on the energy saving research on evaporation crystallization process of bittern. Based on the thermo sensitivity of solubility of various salts in bittern, the magnesium salts are purified. The conventional evaporation crystallization process used to separate the bittern demands high energy consumption and has low thermodynamic efficiency. Therefore, the multi-effect evaporation (MEE), thermal vapor recompression (TVR) heat pump and mechanical vapor recompression (MVR) heat pump technology were applied to the conventional evaporation crystallization process. The MVR and TVR technology can both make full use of the secondary steam heating materials that will save energy. In addition, Aspen Plus (Version 7.3) was used to simulate the processes of the electrolyte-containing system under the ELECNTRAL thermodynamic model. For the better evaluation of various evaporation crystallization processes, some important evaluation indexes, such as energy consumption, annual total cost (ATC) and exergy loss were chosen as objective functions. Compared with the double-effect evaporation crystallization process coupled with TVR heat pump technology, the results indicated that the double-effect evaporation crystallization process coupled with MVR heat pump technology can save energy consumption and ATC by 80.52% and 15.32% respectively. Furthermore, the MVR heat pump technology takes the lowest effective energy loss, which is a more competitive factor of evaporation crystallization process of bittern.

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Section: Double-effect Evaporation Crystallization Processmentioning

confidence: 99%

Energy Saving Research on Multi-effect Evaporation Crystallization Process of Bittern Based on MVR and TVR Heat Pump Technology

Yang¹,

Leng²,

Li³

et al. 2020

AJCHE

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“…Results indicated that the represented integration improved the overall efficiency of the system by 10% and the maximum net power increase was 25% of the rated power . In another study, a solar power integrated with supercritical carbon dioxide Brayton cycle and multiple effect evaporation with thermal vapor compression (MEE‐TVC) desalination system for power generation and water production . Two different configuration (regeneration and recompression) for Brayton cycle were analyzed as shown in Figures and .…”

Section: Supercritical Brayton Cyclesmentioning

confidence: 99%

“…As same as recompression cycle An extra compressor and an extra turbine are added power generation and water production. 129 Two different configuration (regeneration and recompression) for Brayton cycle were analyzed as shown in Figures 12 and 13. Results indicated that recompression configuration (for the same fraction of heat entering supercritical carbon dioxide cycle) had lower levelized cost of energy.…”

Section: As Same As Recompression Cyclementioning

confidence: 99%

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A review on solar‐assisted gas turbines

Ahmadi

Nazari

Ghasempour

et al. 2018

Energy Science & Engineering

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The thermal energy of the sun can be used for electricity generation. Solar thermal energy can be applied with fossil fuels or independently in order to reduce the cost of generated electricity and CO2 emission. Several cycles are introduced to extract solar thermal energy to be used in power plants. Brayton cycles, Rankine‐Brayton cycles, and supercritical Brayton cycles are among the most conventional ones. Based on the reviewed researches, using solar energy in addition to fossil fuels results in lower carbon dioxide emission and lower levelized cost of the generated electricity. Moreover, thermodynamic and economic analyses of the cycles revealed that heat recovery leads to higher efficiency while increase capital cost. The efficiency of solar‐assisted gas turbines depend on various parameters including pressure ratio, turbine inlet temperature, heat absorber geometry and the performance of the components. The enhancement in the efficiency of the cycles by applying each method depends on the configuration, operating condition. For instance, results have shown that 10% increase in turbine efficiency can led to 6%‐12% improvement in the efficiency of a closed‐Brayton cycle.

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“…Carbon Dioxide (CO2) is inexpensive, non-toxic, non-flammable, nonexplosive and abundant, and has a moderate critical pressure of 7.38 MPa and critical temperature of 31.1℃. Because of the outstanding capacity of withstanding very high temperature, supercritical CO2 (sCO2) is regarded as an attractive working fluid for the closed power cycles employed by Concentrating Solar Thermal (CST) applications [63,[170][171][172]. Also, the cycle compressor works in the near-critical region, where the sCO2 density rise for different pressures is not very high [173].…”

Section: Introductionmentioning

confidence: 99%

Computational investigations on heat transfer of turbulent supercritical CO2 in large tubes using RANS modelling

Wang¹

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Owing to the potential to offer higher cycle efficiency, supercritical carbon dioxide (sCO2) is considered as the promising alternative to replace conventional working fluids, such as steam, for the next-generation power cycles embedded in Concentrating Solar Thermal (CST) applications. Gaining in-depth understandings on flow and heat transfer characteristics of turbulent sCO2 near critical point Publications included in this thesisWith permission by the University of Queensland Policy 4.60.07 (Alternate Thesis Format Options), scholarly works during candidature are included and form the main parts of this thesis. The contexts of four chapters (Chapter 3, 4, 5 and 6) have been published in peer reviewed journals and the review work (Chapter 2) has been submitted to a peer-review journal. Clear statements of authorship and contribution are provided as follows.

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Entropy, exergy, and cost analyses of solar driven cogeneration systems using supercritical CO2 Brayton cycles and MEE-TVC desalination system

Cited by 71 publications

References 35 publications

Energy Saving Research on Multi-effect Evaporation Crystallization Process of Bittern Based on MVR and TVR Heat Pump Technology

Energy Saving Research on Multi-effect Evaporation Crystallization Process of Bittern Based on MVR and TVR Heat Pump Technology

A review on solar‐assisted gas turbines

Computational investigations on heat transfer of turbulent supercritical CO2 in large tubes using RANS modelling

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