Performance analysis of a solar air heater modified with zig-zag shaped copper tubes using energy-exergy methodology

Kumar, Dhananjay; Mahanta, Pinakeswar; Kalita, Pankaj

doi:10.1016/j.seta.2021.101222

Cited by 17 publications

(7 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Energies 2021, 14, 4838 6 of 19 Energy equilibrium can be expressed by Equation (11), which states that the input energy is equal to the output energy [32].…”

Section: Energy Efficiency and Energy Lossmentioning

confidence: 99%

See 1 more Smart Citation

Exergy and Energy Analyses of Microwave Dryer for Cantaloupe Slice and Prediction of Thermodynamic Parameters Using ANN and ANFIS Algorithms

et al. 2021

View full text Add to dashboard Cite

The study targeted towards drying of cantaloupe slices with various thicknesses in a microwave dryer. The experiments were carried out at three microwave powers of 180, 360, and 540 W and three thicknesses of 2, 4, and 6 mm for cantaloupe drying, and the weight variations were determined. Artificial neural networks (ANN) and adaptive neuro-fuzzy inference systems (ANFIS) were exploited to investigate energy and exergy indices of cantaloupe drying using various afore-mentioned input parameters. The results indicated that a rise in microwave power and a decline in sample thickness can significantly decrease the specific energy consumption (SEC), energy loss, exergy loss, and improvement potential (probability level of 5%). The mean SEC, energy efficiency, energy loss, thermal efficiency, dryer efficiency, exergy efficiency, exergy loss, improvement potential, and sustainability index ranged in 10.48–25.92 MJ/kg water, 16.11–47.24%, 2.65–11.24 MJ/kg water, 7.02–36.46%, 12.36–42.70%, 11.25–38.89%, 3–12.2 MJ/kg water, 1.88–10.83 MJ/kg water, and 1.12–1.63, respectively. Based on the results, the use of higher microwave powers for drying thinner samples can improve the thermodynamic performance of the process. The ANFIS model offers a more accurate forecast of energy and exergy indices of cantaloupe drying compare to ANN model.

show abstract

“…Energies 2021, 14, 4838 6 of 19 Energy equilibrium can be expressed by Equation (11), which states that the input energy is equal to the output energy [32].…”

Section: Energy Efficiency and Energy Lossmentioning

confidence: 99%

“…The use of the improvement potential can also be helpful in the evaluation of economic activities [37]. The exergy improvement potential and the exergetic sustainability index can be expressed by Equations ( 30) and (31), respectively [32].…”

Section: Ex Loss =mentioning

confidence: 99%

Exergy and Energy Analyses of Microwave Dryer for Cantaloupe Slice and Prediction of Thermodynamic Parameters Using ANN and ANFIS Algorithms

et al. 2021

View full text Add to dashboard Cite

show abstract

“…As soon as the flow rate increases, the outlet temperature of the air decreases, resulting in a decrease in exergy efficiency after the optimum point. For the results presented in Figure 29, studies [144][145][146] are numerical investigations, while [147] is an experimental study that showed a different trend. The numerical investigations showed that exergy efficiency starts to decrease at lower flow rates, while experimental investigations demonstrated an inverse trend, as shown in Figure 29.…”

Section: Exergy Analysismentioning

confidence: 99%

A Comprehensive Review of the Thermohydraulic Improvement Potentials in Solar Air Heaters through an Energy and Exergy Analysis

Hassan,

Nikbakht,

Fawzia

et al. 2024

Energies

View full text Add to dashboard Cite

Supply disruptions, uncertainty, and unprecedented price rises of fossil fuels due to the recent pandemic and war have highlighted the importance of using renewable sources to meet energy demands. Solar air collectors (SACs) are major types of solar energy systems that can be utilized for space and water heating, drying, and thermal energy storage. Although there is sufficient documentation on the thermal analyses of SACs, no comprehensive reviews of the exergetic performance or qualitative insight on heat conversion are available. The primary objective of this article is to provide a comprehensive review on the optimum conditions at which the thermal performance of diverse types of solar air collectors is optimized. The effect of operating parameters such as temperature rise, flow rate, geometric parameters, solar radiation, and the Reynolds number on the thermal performance of SACs in terms of thermal hydraulic performance, energy, and exergy efficiencies has been reviewed adaptively. Beyond the operating parameters, a deep investigation is outlined to monitor fluid dynamics using analytical and computational fluid dynamics (CFDs) methodologies in the technology of SACs. In the third phase, thermodynamic irreversibility due to optical losses, thermal losses between absorber and environment, heat losses due to insulation, edge losses, and entropy generation are reported and discussed, which serve as the fundamental tools for optimization purposes.

show abstract

“…Sahu et al (2021) revealed that the arc-shape rib roughened SAC has a maximum thermal efficiency of 71.6% for apex-upstream and 55.8% for apex-downstream than the smooth pass solar air collector (SPSAC) for a mass flow rate ranging from 0.010 to 0.047 kg s −1 . Kumar et al (2021) analyzed the thermohydraulic performance of the SAC with zig-zag-shaped copper tubes and revealed that the maximum value of energy and exergy efficiency as 62.8% and 58.48% was obtained at an airflow rate of 0.05 kg/s. Tabish et al (2021) analytically evaluated the performance of the protrusion rib-roughened SAC and found that the net effective efficiency of 70.92% was achieved at a rib pitch ratio of 10 and rig height ratio of 0.0289.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation and optimization of dimple-roughened impinging jet solar air collector using a novel AHP-MABAC approach

Salman

Chauhan

Singh

et al. 2022

Environ Sci Pollut Res

View full text Add to dashboard Cite

The effect of the flow and geometric parameters of a dimple-roughened absorber plate on the enactment of solar air collectors (SACs) with air-impinged jets was investigated in this study. The performance-defining criteria (PDCs) of a jet-impinged dimple-roughened SAC (JIDRSAC)-forced convection airflow system are significantly affected by variations in the system’s control factors (CFs), such as the arc angle ( α aa ) ranging from 30° to 75°, dimple pitch ratio ( p d / D h ) ranging from 0.269 to 1.08, and dimple height ratio ( e d /D h ) ranging from 0.016 to 0.0324. The constant parameters of the jet slot are a stream-wise pitch ratio (X i /D hd ) is 1.079, a span-wise pitch ratio (Y i /D hd ) is 1.619, and a jet diameter(D i /D hd ) is 0.081. Based on the combined approach of the analytic hierarchy process and multi-attributive border approximation area comparison (AHP-MABAC), the Reynolds number ( Re ) = 15,000, α aa = 60°, p d / D h = 0.27, and e d / D h = 0.027 depicted the best alternative (A-9) set among 16 alternatives to deliver the optimal performance of the JIDRSAC. The jet impingement pass compared to the smooth pass, the Nusselt number increased by 2.16–2.81, and friction factor increased by 3.35–5.95, and JIDRSAC was compared to the jet impingement pass, exhibiting an enhancement in Nusselt number and friction factor in the range of 0.55–0.80 and 0.05–0.15, respectively. In addition, sensitivity analysis is used to examine the ranking's stability and reliability in relation to the PDC weights.

show abstract

Performance analysis of a solar air heater modified with zig-zag shaped copper tubes using energy-exergy methodology

Cited by 17 publications

References 49 publications

Exergy and Energy Analyses of Microwave Dryer for Cantaloupe Slice and Prediction of Thermodynamic Parameters Using ANN and ANFIS Algorithms

Exergy and Energy Analyses of Microwave Dryer for Cantaloupe Slice and Prediction of Thermodynamic Parameters Using ANN and ANFIS Algorithms

A Comprehensive Review of the Thermohydraulic Improvement Potentials in Solar Air Heaters through an Energy and Exergy Analysis

Experimental investigation and optimization of dimple-roughened impinging jet solar air collector using a novel AHP-MABAC approach

Contact Info

Product

Resources

About