Minimizing the overall loss coefficient of flat plate solar collector using energy, entropy and exergy analysis

Sathyakala, Ponnusamy; Gangadharan, Sai Sundara Krishnan; Kalaiarasu, Balaji

doi:10.1177/09544089211022617

Cited by 2 publications

(1 citation statement)

References 24 publications

(53 reference statements)

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“…Amongst the different renewable sources that could be exploited for energy generation, solar radiation plays a vital role due to its universal availability and almost zero fuel cost However, there are associated problems with solar energy. 4,5 It is transient; i.e. non-steady and non-uniform and these features play critical roles in the technical reliability as well as economic viabilities of solar energy systems.…”

Section: Introductionmentioning

confidence: 99%

Impacts of biomass hybridization on exergetic sustainability of a solar organic Rankine cycle power plant

Oyekale

Emagbetere

2022

Proceedings of the Institution of Mechanical Engineers, Part E:

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Due to the low thermo-economic performance of solar ORC plants, several studies are ongoing to investigate the potential merits/demerits of biomass hybridization as a retrofit. Although many of such studies have examined the technical and economic viabilities of various hybrid solar-biomass concepts, due attention has not been directed to the area of their sustainability based on the Second Law of Thermodynamics. This study was aimed at investigating the potential effects of biomass hybridization on the exergetic sustainability of an organic Rankine cycle (ORC) power plant. Design data of an existing solar ORC plant currently operational at Ottana (Italy) were employed for analysis. The referenced ORC plant is rated at about 630 kWe, powered at the moment solely by a concentrated solar power (CSP) field, which integrates linear Fresnel collectors with two-tank thermal energy storage (TES) device. Five different exergetic sustainability indicators were employed in this study to assess the aforementioned ORC plant when fed by hybrid solar-biomass energy resources. Results showed the hybrid plant's destruction factor (DF), exergetic sustainability index (ESI), environmental effect factor (EEF), improvement potential rate (IPR), and recoverability ratio (RECR) of 89.40%, 0.119, 8.435, 4744.8 kW, and 0.89, respectively. Additionally, a comparison of the solar-only and the hybrid solar-biomass schemes revealed that biomass hybridization would improve the exergetic sustainability of the ORC plant. Nevertheless, the high value of IPR obtained suggests that ample opportunities would yet exist to further enhance sustainability indices of the studied ORC plant post biomass hybridization. In sum, biomass hybridization of the solar ORC plant considered in this study would enhance sustainability performance but more opportunities would yet exist to further optimize the system.

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Section: Introductionmentioning

confidence: 99%

Impacts of biomass hybridization on exergetic sustainability of a solar organic Rankine cycle power plant

Oyekale

Emagbetere

2022

Proceedings of the Institution of Mechanical Engineers, Part E:

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Critical analysis of the energy and exergy performance of an air heater duct with perforated 60-degree V-down baffles affixed to the heated surface

Pandey

2024

Proceedings of the Institution of Mechanical Engineers, Part E:

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The indirect-mode solar dryer, with a solar air heater as a vital component, is commonly preferred for enhancing agricultural product quality. Energy and exergy analyses for an air heating system assess thermal gain and irreversibility in energy conversion. According to the literature, the easiest way to enhance the SAH’s energy and exergy performance is by incorporating flow-modifying elements or turbulators in the air passage. And the effective-energy assessment accounts for the increased airflow pumping power demands. This work aims to experimentally compare the energy and exergy performance of a smooth air heater duct with one integrated with perforated V-shaped baffles while critically examining the factors leading to the efficiency variations. The racetrack-shaped perforated V-baffles with 60-degree air attack angles are installed on the heated surface with V-down and staggered hole arrays, covering a turbulent flow Reynolds number (Re) range of 5400–13,100 during experimentation. The investigation involves varying the pitch-to-duct depth ratio (p/H) of baffles (with values of 1, 2 and 3) and considering two different hole-aspect ratio (w/d) values of 5.04 and 2.68, with the same open area ratio. The results reveal that baffles with w/d of 2.68 at p/H of 3, causing enhanced airflow turbulence and momentum diffusivity, provide the highest effective-energy ([Formula: see text]) and exergy ([Formula: see text]) efficiencies values of 88.7% and 12.44%, respectively, at Re of 11,816 and 8765. Based on the operating and geometrical parameters used in the experiments, the correlations of [Formula: see text] and [Formula: see text] developed demonstrate good accuracy. The values for mean absolute error, root mean squared error and R 2 (coefficient of determination) in the correlations, developed using the statistical computing R software, are 0.012427, 0.014837 and 0.9913 for [Formula: see text] and 0.004332, 0.005047 and 0.9557 for [Formula: see text], respectively.

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Minimizing the overall loss coefficient of flat plate solar collector using energy, entropy and exergy analysis

Cited by 2 publications

References 24 publications

Impacts of biomass hybridization on exergetic sustainability of a solar organic Rankine cycle power plant

Impacts of biomass hybridization on exergetic sustainability of a solar organic Rankine cycle power plant

Critical analysis of the energy and exergy performance of an air heater duct with perforated 60-degree V-down baffles affixed to the heated surface

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