A numerical model and experimental verification for analysing a new vacuum spray flash desalinator utilising low grade energy

Araghi, Alireza Hosseini; Khiadani, Mehdi; Sadafi, Hosein; Hooman, Kamel

doi:10.1016/j.desal.2017.03.014

Cited by 35 publications

(9 citation statements)

References 21 publications

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“…The water treatment system used in the project was based on a vacuum flash desalination process, which allows using the low‐grade waste heat to produce clean water. The evaporation rate is 3.8%, which is close to, though not the same as, the numerical and experimental data of Hosseini Araghi, Khiadani 27 and Hosseini Araghi, Khiadani 28 . It is important to notice that the evaporation rate obtained in the present power block is lower than the obtained by Araghi, Khiadani 29 in his Rankine power cycle based on natural gas.…”

Section: Remarkssupporting

confidence: 81%

“…The evaporation rate is 3.8%, which is close to, though not the same as, the numerical and experimental data of Hosseini Araghi, Khiadani 27 and Hosseini Araghi, Khiadani. 28 It is important to notice that the evaporation rate obtained in the present power block is lower than the obtained by Araghi, Khiadani 29 in his Rankine power cycle based on natural gas. This is mainly because those authors designed the power cycle specifically to produce water, which decreases the cycle thermal conversion efficiency.…”

Section: Remarkscontrasting

confidence: 55%

“…The evaporation rate or water recovery is similar to the three cases of study, although this value is slightly lower than the one obtained in similar works using organic Rankine power cycle. 28,29 Here, we analyze the viability of incorporating a desalination process that uses the waste heat without sacrificing the power cycle efficiency as otherwise this would have led to a considerable increase in the CST equipment cost.…”

Section: Energy Flows In the Power Block And Desalination Ratementioning

confidence: 99%

“…The system works based on creating vacuum conditions inside a drum where the water boiling temperature is lower (than that under atmospheric condition) and allow its evaporation at lower temperatures. 27,28 The idea of using cogeneration to increase the efficiency of the power plant has been widely explored over the years. Moser, Trieb 16 and Leiva-Illanes, Escobar 20 analyzed the integration of a MED into a CST system based on a Rankine Cycle.…”

Section: Introductionmentioning

confidence: 99%

“…An alternative for small power plants is a vacuum flash desalination system that takes advantage of low‐grade energy sources to produce water. The system works based on creating vacuum conditions inside a drum where the water boiling temperature is lower (than that under atmospheric condition) and allow its evaporation at lower temperatures 27,28 …”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Techno‐economic analysis of a hybrid solar‐geothermal power plant integrated with a desalination system

Aviles

Sabri

Hooman

2021

Intl J of Energy Research

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This paper proposes the use of a hybrid 5 MW power generation system combining concentrated solar thermal and solar photovoltaic technology where the efficiency of the power block is increased by taking advantage of hot water from a low-temperature geothermal source. Aiming at a case study for Winton in Queensland the pertinent meteorological data are used for our simulations.In addition, the paper analyzes the feasibility of including a thermal desalination technology that uses the waste heat from the power block for producing clean water from wastewater. Our design replaces the traditional dry cooling system with a water-cooled heat exchanger to remove the waste heat from the power block. Finally, this work explores the ratio of concentrated solar thermal and photovoltaic electricity production that optimizes the levelized cost of electricity and water production. the results indicate that the incorporation of the desalination system does not produce a significant increase in this value, and the optimal ratio of electricity production is obtained when the photovoltaic system contributes to 27.5% of the total electricity generation. Our water production cost can be as low as 40 ₵/m 3 while for the combined system our minimum levelized cost of electricity figures out at 12.4 ₵/kWh to generate the base load with thermal storage.

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Section: Remarkssupporting

confidence: 81%

Section: Remarkscontrasting

confidence: 55%

Section: Energy Flows In the Power Block And Desalination Ratementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Techno‐economic analysis of a hybrid solar‐geothermal power plant integrated with a desalination system

Aviles

Sabri

Hooman

2021

Intl J of Energy Research

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Numerical simulation on the pressure, turbulence, and λ2 vortex characteristics within the annular symmetric jet process under different vacuum degrees

Chai,

Hu,

Gao

et al. 2024

Asia-Pacific J Chem Eng

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The jet impingement flash technology represents a paramount research subject in the domain of heat and mass transfer. To augment its commercial potential, the conjunction of annular multi‐aperture jet impingement with negative pressure flash evaporation is introduced in this study. The employment of an annular nozzle array is integral to the enhancement of the heat and mass transfer efficiency between the phases. The Realizable k‐ε model is used in this study. The negative pressure flash vaporization model was also developed by introducing a mass source term and an energy source term based on the Mixture model. The flow characteristics are characterized using numerical simulation. Additionally, the λ2 vortex identification criterion is investigated the vortex structure. The simulation results exhibit good agreement with experimental findings, demonstrating that a higher initial vacuum leads to a stronger flashing effect and a more chaotic movement of the flow group within the flow field. Thus, this study provides a reference method for the structural design and optimization of annular symmetric jet impingement negative pressure deammonia chemical equipment for engineering applications.

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Design and Simulation of a Low‐Temperature Thermal Desalination System

Karmakar,

Patra,

Saha

et al. 2023

Chem Eng & Technol

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The prototype of a low‐temperature thermal desalination system treating 2500 L day−1 of saline water was designed thermally and geometrically, to be integrated with a vacuum spray flash drum and spray nozzles, a plate heat exchanger‐type condenser, and a thermosyphon solar water heater to produce potable water for a small community. The design bases were the feed flow rate, the feed temperature from 45 to 65 °C, the salinity of 0.035 kg kg−1, and the vacuum drum pressure from 2 to 6 kPa absolute. The estimated yield of potable water based on the simulated droplet dynamics was in the range of 68.91–75.80 %. The plate heat exchanger and the thermosyphon solar water heater were designed for effective condensation and passive heating, respectively.

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A numerical model and experimental verification for analysing a new vacuum spray flash desalinator utilising low grade energy

Cited by 35 publications

References 21 publications

Techno‐economic analysis of a hybrid solar‐geothermal power plant integrated with a desalination system

Techno‐economic analysis of a hybrid solar‐geothermal power plant integrated with a desalination system

Numerical simulation on the pressure, turbulence, and λ2 vortex characteristics within the annular symmetric jet process under different vacuum degrees

Design and Simulation of a Low‐Temperature Thermal Desalination System

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