Determination of the optimal operation mode of a flat solar collector by exergetic analysis and numerical simulation

Luminosu, Ioan; Fara, Laurenţiu

doi:10.1016/j.energy.2004.04.061

Cited by 91 publications

(51 citation statements)

References 15 publications

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“…Jafarkazemi et al conducted both energy and exergy analyses of a flat plate solar collector [9]. Luminosu and Fara proposed an exergy analysis of a flat plate solar collector based on the assumption that fluid inlet temperature is equal to ambient temperature [10]. Farahat et al attempted to determine the optimum values of the mass flow rate, absorber plate area, and maximum exergy efficiency of a flat plate collector [11].…”

Section: Introductionmentioning

confidence: 99%

Exergy Analysis of Flat Plate Solar Collectors

Wang

et al. 2014

Entropy

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This study proposes the concept of the local heat loss coefficient and examines the calculation method for the average heat loss coefficient and the average absorber plate temperature. It also presents an exergy analysis model of flat plate collectors, considering non-uniformity in temperature distribution along the absorber plate. The computation results agree well with experimental data. The effects of ambient temperature, solar irradiance, fluid inlet temperature, and fluid mass flow rate on useful heat rate, useful exergy rate, and exergy loss rate are examined. An optimal fluid inlet temperature exists for obtaining the maximum useful exergy rate. The calculated optimal fluid inlet temperature is 69 °C, and the maximum useful exergy rate is 101.6 W. Exergy rate distribution is analyzed when ambient temperature, solar irradiance, fluid mass flow rate, and fluid inlet temperature are set to 20 °C, 800 W/m 2 , 0.05 kg/s, and 50 °C, respectively. The exergy efficiency is 5.96%, and the largest exergy loss is caused by the temperature difference between the absorber plate surface and the sun, accounting for 72.86% of the total exergy rate.

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Section: Introductionmentioning

confidence: 99%

Exergy Analysis of Flat Plate Solar Collectors

Wang

et al. 2014

Entropy

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“…Farzad et al [27] scrutinized both exergy analysis and energy of a flat plate solar collector. Luminosu and Fara [28] suggested exergy analysis of a flat plate solar collector based on the assumption that fluid inlet temperature is equal to ambient temperature. The analysis optimum values of mass flow rate, absorber plate area, and maximum exergy efficiency of a flat plate collector was carried out by Farahat et al [29].…”

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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“…Zhong et al [11] provided exergy analysis model of flat plate collector (FPC) and reported 5.96% exergy efficiency where major portion of the exergy destruction is caused by energy conversion from high sun temperature to low absorber plate temperature. Luminosu et al [12] recommended the optimum operation conditions of FPC by exergy analysis. However, they assumed constant water inlet temperature equal to ambient temperature.…”

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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Determination of the optimal operation mode of a flat solar collector by exergetic analysis and numerical simulation

Cited by 91 publications

References 15 publications

Exergy Analysis of Flat Plate Solar Collectors

Exergy Analysis of Flat Plate Solar Collectors

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

Exergy Analysis of Serpentine Thermosyphon Solar Water Heater

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