Improving performance of AHU using exhaust air potential by applying exergy analysis

Kalbasi, Rasool; Izadi, Farhad; Talebizadehsardari, Pouyan

doi:10.1007/s10973-019-09198-1

Cited by 45 publications

(9 citation statements)

References 74 publications

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“…One important tool to evaluate renewable and hybrid systems is the second law of thermodynamics [16][17][18]. It can depict each parameter's effects on the system and evaluate the system economically [24][25][26]. Merve [15] studied a solar-and geothermal energy-powered Organic Rankine Cycle (ORC) based on the first and second thermodynamics laws and showed that while the total power extracted by the solar system is increased, energy and exergy efficiencies of the geothermal-powered ORC decreased.…”

Section: Introductionmentioning

confidence: 99%

“…Similarly, Nematollahi [23] proposed a novel method to use the heat waste of wind turbines into an organic Rankine cycles system and analyzed it based on the thermodynamic's second law. Mohammadi [24] analyzed the exergy efficiency of combined cooling, heating, and power system integrated with a wind turbine and compressed air energy storage system. This study revealed that wind turbines and combustion chambers are the most important sources of this system's exergy destruction.…”

Section: Introductionmentioning

confidence: 99%

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WITHDRAWN: Exergy and Energy Analysis of a CHP System with a Gas Turbine and a Horizontal Axis Wind Turbine

Norouzi

2021

Tr Ren Energy

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The combined heating and power (CHP) system is among the most effective ways to increase energy and exergy efficiencies, reduce fuel consumption, and reduce operational costs. In this study, the combination of an electricity and heat CHP system with the prime movers of a gas turbine and a horizontal axis wind turbine under the strategy of providing electric charge has been investigated. This study aims to evaluate the effect of the wind turbine on the system. The Blade Element Momentum Theory (BEM) is used to model the wind turbine under different wind speeds, pitch angle, and tip speed ratios to show their effect on the gas turbine system under different combustion chamber temperatures and pressure ratios. The results show that the proposed CHP system has significant advantages over the separate production system. It is shown that the best operating condition for the wind turbine is at the wind speed of 12 m/s, the pitch angle of 5°, and the tip speed ratio of 3. Moreover, the wind speed and tip speed ratio effects become considerable at the high-pressure ratios of more than ten and the combustion chamber temperature below 1250°C on the total system's exergy efficiency. Also, compared to the separate production mode, operational costs and fuel consumption are reduced by about 55% and 60%, respectively. Finally, taking into account the interest rate, the payback period will be equal to 5.4 years.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

WITHDRAWN: Exergy and Energy Analysis of a CHP System with a Gas Turbine and a Horizontal Axis Wind Turbine

Norouzi

2021

Tr Ren Energy

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“…Improving HTR can reduce energy consumption in buildings 1 – 4 , energy-intensive industries 5 – 9 , and desalinators 10 – 14 and generally improve performance 15 , 16 . NCHT with radiation occurs in some industrial and laboratory equipment 17 , 18 .…”

Section: Introductionmentioning

confidence: 99%

Lattice Boltzmann-based numerical analysis of nanofluid natural convection in an inclined cavity subject to multiphysics fields

Ibrahim

Berrouk

Saeed

et al. 2022

Sci Rep

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This research conducts a study of natural convection heat transfer (NCHT) in a nanofluid under a magnetic field (MF). The nanofluid is in a cavity inclined at an angle of 45°. The MF can take different angles between 0° and 90°. Radiative heat transfer is present in the cavity in volumetric form. There are two hot semicircles, similar to two half-pipes, on the bottom wall. The top wall is kept cold. The side walls and parts of the bottom wall, except the pipes, have been insulated. The lattice Boltzmann method has been used for the simulation. The studied parameters are the Rayleigh number (in the range 103–106), magnetic field angle, radiation parameter (in the range 0–2), and nanoparticle volume fraction (in the range 0–5%). The generated entropy has been studied as the NCHT. The results indicate that adding nanoparticles improves heat transfer rate (HTR). Moreover, the addition of volumetric radiation to the cavity enhances the Nusselt number by 54% and the generated entropy by 12.5%. With an augmentation in the MF angle from 0° to 90°, HTR decreases and this decrease is observed mostly at higher Rayleigh numbers. An augmentation in the Ra increases NCHT and entropy generation. Indeed, a rise in the Ra from 103 to 106 increases HTR by almost sixfold.

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“…Because of the importance of HTR in many industrial phenomena such as energy consumption management [1][2][3][4][5][6][7][8], heat storage [9,10], cooling [11][12][13][14], and desalination [15,16], numerous scientists have focused on HTR enhancement. The distribution of vortex generations is widely employed to enhance HTR in heat exchangers and the cooling of turbine blades and electronic pieces.…”

Section: Introductionmentioning

confidence: 99%

Using finite volume method for investigating the turbulent flow field and heat transfer of a non-Newtonian nanofluid in a channel with triangular vortex generators

Ibrahim¹,

Saeed²

2021

Preprint

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This study examines the turbulent flow field and heat transfer rate (HTR) of the non-Newtonian H2O-Al2O3-carboxymethyl (CMC) in a channel with vortex generators. The finite volume method and SIMPLE algorithm were employed for solving the partial differential equations. The mean Nusselt numbers (Num) and pressure drops were studied at angles of 30-60°, vortex generator depths of 1-3 mm, Reynolds numbers (Re) of 3000-30000, and nanoparticles volume fractions (φ) of 0.5% and 1.5%. According to the numerical results, the use of triangular vortex generators significantly incremented the Nusselt number (Nu) of the non-Newtonian nanofluid (NF), while it had a lower effect on the enhancement of pressure drop (DP). It was also indicated that a change in the vortex generator depth in the range of a few millimeters had no significant effects on the Nu and pressure drop. Moreover, a rise in the Re (i.e., more turbulent flow) significantly incremented HTR. An increase in the Re raised pressure drop; however, the Num incremented more than the pressure drop. Also, the variations of the local Nu indicated that the local Nu significantly incremented around vortex generators due to the formation of vortex flows. An enhancement in the volume fraction of the base fluid’s nanoparticles (NPs) from 0.5% to 1.5% significantly incremented HTR and the Nu.

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Improving performance of AHU using exhaust air potential by applying exergy analysis

Cited by 45 publications

References 74 publications

WITHDRAWN: Exergy and Energy Analysis of a CHP System with a Gas Turbine and a Horizontal Axis Wind Turbine

WITHDRAWN: Exergy and Energy Analysis of a CHP System with a Gas Turbine and a Horizontal Axis Wind Turbine

Lattice Boltzmann-based numerical analysis of nanofluid natural convection in an inclined cavity subject to multiphysics fields

Using finite volume method for investigating the turbulent flow field and heat transfer of a non-Newtonian nanofluid in a channel with triangular vortex generators

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