Applications of nanofluids in geothermal: A review

Ahmadi, Mohammad Hossein; Ramezanizadeh, Mahdi; Nazari, Mohammad Alhuyi; Lorenzini, Giulio; Kumar, Ravinder; Jilte, Ravindra

doi:10.18280/mmep.050402

Cited by 38 publications

(19 citation statements)

References 37 publications

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“…Renewable energies consist of a wide range of energy sources including solar, wind, water, geothermal and biomass (Nazari et al 2018;Ahmadi et al 2018b;Alizadeh et al 2018;Ramezanizadeh et al 2018b). In this paper, wind, solar and biomass energies were used based on the available potential in the region.…”

Section: Renewable Energy Sourcesmentioning

confidence: 99%

Simulation of biogas utilization effect on the economic efficiency and greenhouse gas emission: a case study in Isfahan, Iran

Ariae¹,

Jahangiri

Fakhr

et al. 2019

Int. J. Renew. Energy Dev.

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Biomass is a type of renewable energy that, in despite of its potentials and advantages including simple production technology, decreasing environmental issues, and energy generation capacity at the consumption site, has not been sufficiently utilized in Iran. Since, due to statistics, Isfahan enjoys remarkable prospects in terms of wind, solar and biomass energies, a combined system of indigenous energy sources for powering a cattle farm has been investigated and evaluated in this study. To evaluate the possibility of the optimal system for comparative reasons, the HOMER software was used. The designed hybrid system was a wind-solar-biomass generator that used a battery saver as backup. Although it seems that wind and solar energies have the highest potential for energy generation in Isfahan, the results showed that biomass, by itself, can provide the required power for a cattle farm. In fact, biomass energy was more economically efficient than wind and solar energies. Owing to the low electricity cost, generated from fossil fuels, in Iran, relative to a large number of countries, the findings revealed that using biomass for generating the electricity of a cattle farm will compensate the expenses by the mid-15th year and will generate profit for 9.5 years later. The results also showed that the solar cell-based hybrid system is cheaper than the wind turbine-based one. Regarding the price of per kWh of electricity produced, the results showed that the biomass generator system with the price 0.12 $/kWh is the cheapest, and the solar cell-based and wind turbine-based hybrid systems are 3.33% and 10.83% more expensive, respectively. The results can be used for electricity generation with minimum pollution and expenses in the same regions. ©2019. CBIORE-IJRED. All rights reserved

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Section: Renewable Energy Sourcesmentioning

confidence: 99%

Simulation of biogas utilization effect on the economic efficiency and greenhouse gas emission: a case study in Isfahan, Iran

Ariae¹,

Jahangiri

Fakhr

et al. 2019

Int. J. Renew. Energy Dev.

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“…In order to solve this problem, nanofluids, composed of suspended particles with nanometer dimensions and a base fluid, are suggested [1,2]. Nanofluids have modified thermal features compared with the base liquid owing to the existence of solid nano-sized particles [3][4][5][6][7][8] Thus, in order to increase the heat transfer coefficient, nanofluids' utilization in micro and macro channels has been popular. On the other hand, some effects, like viscous dissipation, that can be neglected in macro-scale problems are of particular importance in smaller scales [9].…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Forced Convective Heat Transfer and Performance Evaluation Criterion of Al2O3/Water Nanofluid Flow inside an Axisymmetric Microchannel

et al. 2020

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Al2O3/water nanofluid conjugate heat transfer inside a microchannel is studied numerically. The fluid flow is laminar and a constant heat flux is applied to the axisymmetric microchannel’s outer wall, and the two ends of the microchannel’s wall are considered adiabatic. The problem is inherently three-dimensional, however, in order to reduce the computational cost of the solution, it is rational to consider only a half portion of the axisymmetric microchannel and the domain is revolved through its axis. Hence. the problem is reduced to a two-dimensional domain, leading to less computational grid. At the centerline (r = 0), as the flow is axisymmetric, there is no radial gradient (∂u/∂r = 0, v = 0, ∂T/∂r = 0). The effects of four Reynolds numbers of 500, 1000, 1500, and 2000; particle volume fractions of 0% (pure water), 2%, 4%, and 6%; and nanoparticles diameters in the range of 10 nm, 30 nm, 50 nm, and 70 nm on forced convective heat transfer as well as performance evaluation criterion are studied. The parameter of performance evaluation criterion provides valuable information related to heat transfer augmentation together with pressure losses and pumping power needed in a system. One goal of the study is to address the expense of increased pressure loss for the increment of the heat transfer coefficient. Furthermore, it is shown that, despite the macro-scale problem, in microchannels, the viscous dissipation effect cannot be ignored and is like an energy source in the fluid, affecting temperature distribution as well as the heat transfer coefficient. In fact, it is explained that, in the micro-scale, an increase in inlet velocity leads to more viscous dissipation rates and, as the friction between the wall and fluid is considerable, the temperature of the wall grows more intensely compared with the bulk temperature of the fluid. Consequently, in microchannels, the thermal behavior of the fluid would be totally different from that of the macro-scale.

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“…Renewable energy resources such as wind, geothermal, and solar are broadly employed for different goals including cooling, heating, and generation of electricity . Among the mentioned renewable energy sources, solar is one of the most attractive ones due to its easy availability and high capacity .…”

Section: Introductionmentioning

confidence: 99%

“…generation of electricity. [1][2][3][4] Among the mentioned renewable energy sources, solar is one of the most attractive ones due to its easy availability and high capacity. 5,6 There are several benefits in using solar energy such as reducing the production of greenhouse gases such as carbon dioxide, improving the efficiency of the current systems, decreasing the dependency on fossil fuel, and some social advantages such as job creation.…”

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confidence: 99%

Exergetic, economic, and environmental analyses of combined cooling and power plants with parabolic solar collector

Javadi

Ahmadi

Khalaji

2019

Env Prog and Sustain Energy

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Due to the necessity of achieving the energy systems with improved efficiency, combined power plants are developing in recent decades. Moreover, employing renewable energy sources in the power generation and heating/cooling purposes is an attractive idea to obtain more environmentally benign energy systems. In the current study, a combined cooling and power (CCP) plant is analyzed based on exergy and economic concepts. Afterward, by adding lithium‐bromide refrigeration cycle and parabolic solar collectors, the plant is investigated. The exergy efficiency, carbon dioxide emission, and cost of generated electricity are evaluated on the basis of SPECO model. The results of the study show that thermal and exergy efficiencies of the CCP plant with the solar collector depend on various parameters and can be affected significantly. The efficiency of the plant after applying lithium‐bromide refrigeration cycle and the solar collector increased from 50.33 to 51.73%, while the exergy efficiency enhanced from 47.48 to 48.22%. In addition, it was concluded that adding the collector and absorption chiller leads to 1.5% reduction in environmental pollutants.

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Applications of nanofluids in geothermal: A review

Cited by 38 publications

References 37 publications

Simulation of biogas utilization effect on the economic efficiency and greenhouse gas emission: a case study in Isfahan, Iran

Simulation of biogas utilization effect on the economic efficiency and greenhouse gas emission: a case study in Isfahan, Iran

Numerical Investigation of Forced Convective Heat Transfer and Performance Evaluation Criterion of Al2O3/Water Nanofluid Flow inside an Axisymmetric Microchannel

Exergetic, economic, and environmental analyses of combined cooling and power plants with parabolic solar collector

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