Energetic-exergetic analysis of an air handling unit to reduce energy consumption by a novel creative idea

Yari, Meysam; Kalbasi, Rasool; Talebizadehsardari, Pouyan

doi:10.1108/hff-09-2018-0524

Cited by 57 publications

(7 citation statements)

References 35 publications

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“…where T n+1 (r, t) and T n (r, t) are two consecutive partial sums for the temperature, and ε = 10 −6 is the relative error for this study. We showed that the original partial differential equation is split into three subproblems, subproblems one through three demonstrating the contributions of initial rate of change in temperature, initial condition, and internal heat generation, which are given by Equations (31) to (35), respectively. It can be noted from these equations that all the temperature profiles from T 1 (r, t) to T 3 (r, t) are in the form of an infinite series.…”

Section: Resultsmentioning

confidence: 99%

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Analytical Solution of Heat Conduction in a Symmetrical Cylinder Using the Solution Structure Theorem and Superposition Technique

et al. 2019

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In this paper, non-Fourier heat conduction in a cylinder with non-homogeneous boundary conditions is analytically studied. A superposition approach combining with the solution structure theorems is used to get a solution for equation of hyperbolic heat conduction. In this solution, a complex origin problem is divided into, different, easier subproblems which can actually be integrated to take the solution of the first problem. The first problem is split into three sub-problems by setting the term of heat generation, the initial conditions, and the boundary condition with specified value in each sub-problem. This method provides a precise and convenient solution to the equation of non-Fourier heat conduction. The results show that at low times (t = 0.1) up to about r = 0.4, the contribution of T1 and T3 dominate compared to T2 contributing little to the overall temperature. But at r > 0.4, all three temperature components will have the same role and less impact on the overall temperature (T).

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Section: Resultsmentioning

confidence: 99%

“…As it will be mentioned later, analytical solutions of this problem were obtained by applying the theory of solution structure combined with the superposition method. This approach can be used for obtaining the heat transfer in many physical applications which solved by different methods [25][26][27][28][29][30][31].…”

Section: Introductionmentioning

confidence: 99%

Analytical Solution of Heat Conduction in a Symmetrical Cylinder Using the Solution Structure Theorem and Superposition Technique

et al. 2019

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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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“…In a similar study, Yari et al (2019) examined the effects of ϕ Amb on the usefulness of adding ERU in AHU. In dry climate ϕ Amb 10%, PC cc reduced only by 0.161 kW (0.9%) while in the wet climate, PC cc diminished by 10 kW (27%).…”

Section: Introductionmentioning

confidence: 99%

Transient Thermal Analysis of a Solar-Assisted AHU by Focusing on Heat Recovery and Nanoparticles: Jeddah Climate Zone

Khetib

2021

Front. Energy Res.

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In the Jeddah climate region, a lot of energy is assigned to the air handling unit (AHU) sector, which should be reduced by using energy-efficient solutions. As the air passes through the cooling coil, a lot of energy is consumed to reduce the temperature along with humidity so that if the air is precooled in the previous stages, energy consumption in this energy-intensive section will be diminished. Using the coldness of the return air in the heat recovery unit (HRU), the incoming air is precooled. Based on the thermodynamic calculations, in June, July, and August, the cooling coil power demand reduces by 11.6, 13.3, and 12%, respectively. In summer, owing to using HRU, an energy-saving by 76.08 MWh is achieved (12.34% reduction in energy demand). By the incorporation of the solar collectors in the AHU, heating coil demand diminishes by 1,206, 1,399, and 1,367 kWh in June, July, and August, respectively. To improve the solar-assisted AHU effectiveness, the MWCNT nanoparticles are injected into the collectors, and it is found that the saving-energy capability improves by 17.7% using MWCNT-water at 0.1 vol.%.

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Energetic-exergetic analysis of an air handling unit to reduce energy consumption by a novel creative idea

Cited by 57 publications

References 35 publications

Analytical Solution of Heat Conduction in a Symmetrical Cylinder Using the Solution Structure Theorem and Superposition Technique

Analytical Solution of Heat Conduction in a Symmetrical Cylinder Using the Solution Structure Theorem and Superposition Technique

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

Transient Thermal Analysis of a Solar-Assisted AHU by Focusing on Heat Recovery and Nanoparticles: Jeddah Climate Zone

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