Exergetic performance evaluation and parametric studies of solar air heater

Gupta, Megha; Kaushik, S.C.

doi:10.1016/j.energy.2008.05.010

Cited by 114 publications

(53 citation statements)

References 18 publications

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“…However, this effect can be minimized if the thermal conductivity is above 50 W/m-k [9]. Gupta et al [10] analyzed the dependency of output exergy of air with respect to aspect ratio of collector, mass flow rate per unit absorber area and duct depth, and commented that there is an optimum inlet temperature of air and mentioned parameters for a particular system. However, they neglected the blower work during the analysis.…”

Section: Introductionmentioning

confidence: 99%

Exergy Analysis of Serpentine Thermosyphon Solar Water Heater

et al. 2018

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Abstract:The performance of a solar hot water system is assessed for heat pump and domestic heating applications. Thermodynamic analysis on a serpentine-type thermosyphon flat-plate solar heater is conducted using the Second Law of thermodynamics. Exergetic optimization is first performed to determine the parameters for the maximum exergy efficiency using MATLAB optimization toolbox. Geometric parameters (collector surface area, dimensions, and pipe diameter), optical parameters (transmittance absorptance product), ambient temperature, solar irradiation and operating parameters (mass flow rate, fluid temperature, and overall heat transfer (loss) coefficient) are accounted for in the optimization scheme. The exergy efficiency at optimum condition is found to be 3.72%. The results are validated using experimental data and found to be in good agreement. The analysis is further extended to the influence of various operating parameters on the exergetic efficiency. It is observed that optical and thermal exergy losses contribute almost 20%, whereas approximately 77% exergy destruction is contributed by the thermal energy conversion. Exergy destruction due to pressure drop is found negligible. The result of this analysis can be used for designing and optimization of domestic heat pump system and hot water application.

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Section: Introductionmentioning

confidence: 99%

Exergy Analysis of Serpentine Thermosyphon Solar Water Heater

et al. 2018

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“…In the collector, airflows in two channels, the depth ratio of up channel to down channel should be no less than 1. Gupta and Kaushik also determined the optimum aspect ratio (length to width ratio of the absorber plate) and optimum duct depth (the distance between the absorber and the bottom plates) for maximum exergy delivery [6]. Luna et al studied different modelling approaches for a solar air collector to use a low number of variables and equations in design [7].…”

Section: Introductionmentioning

confidence: 99%

Theoretical and experimental investigation of the performance of back-pass solar air heaters

Alta¹,

Çağlayan²,

Atmaca³

et al. 2014

Turkish J Eng Env Sci

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This paper presents a study dealing with the experimental and theoretical analysis of a flat plate solar air heater. The air collectors were tested experimentally for the tilt angle of 35• and 2 m s −1 air velocity, and ambient temperature, inlet temperature, outlet temperature, absorber plate temperature, bottom plate temperature, solar radiation, air velocity, and airflow velocity from the duct were measured. The outlet air temperature and energy and exergy efficiencies of the collector were calculated theoretically. The results showed that the collector has the

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“…The use of graphene based nanofluid in the flat plate solar collector exergy efficiency analysis was carried out by Said et al [31]. Further detail regarding the entropy generation analysis in solar collectors can be found in [32][33][34]. In all aforementioned studies authors considered Newtonian fluid model for convective transport of nanofluids.…”

Section: Introductionmentioning

confidence: 99%

Mathematical model for thermal and entropy analysis of thermal solar collectors by using Maxwell nanofluids with slip conditions, thermal radiation and variable thermal conductivity

2018

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Abstract:In the present research a simplified mathematical model for the solar thermal collectors is considered in the form of non-uniform unsteady stretching surface. The non-Newtonian Maxwell nanofluid model is utilized for the working fluid along with slip and convective boundary conditions and comprehensive analysis of entropy generation in the system is also observed. The effect of thermal radiation and variable thermal conductivity are also included in the present model. The mathematical formulation is carried out through a boundary layer approach and the numerical computations are carried out for Cuwater and TiO 2 -water nanofluids. Results are presented for the velocity, temperature and entropy generation profiles, skin friction coefficient and Nusselt number. The discussion is concluded on the effect of various governing parameters on the motion, temperature variation, entropy generation, velocity gradient and the rate of heat transfer at the boundary.

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Exergetic performance evaluation and parametric studies of solar air heater

Cited by 114 publications

References 18 publications

Exergy Analysis of Serpentine Thermosyphon Solar Water Heater

Exergy Analysis of Serpentine Thermosyphon Solar Water Heater

Theoretical and experimental investigation of the performance of back-pass solar air heaters

Mathematical model for thermal and entropy analysis of thermal solar collectors by using Maxwell nanofluids with slip conditions, thermal radiation and variable thermal conductivity

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