Energy and exergy analysis of a vertical solar air heater with nano-enhanced absorber coating and perforated baffles

Khanları, Ataollah; Tuncer, Azim Doğuş; Sözen, Adnan; Aytaç, İpek; Çiftçi, Erdem; Variyenli, Halil İbrahim

doi:10.1016/j.renene.2022.01.074

Cited by 82 publications

(19 citation statements)

References 74 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…CFD simulation results of the TE cooling system have been presented and In TE coolers, the Peltier effect produces a heat flux at the junction of two different types of materials. Heat exchangers are significant elements with an outstanding role in cooling apparatus and energy systems (Tuncer et al, 2021b;Gürbüz et al, 2020a;Jamshed et al, 2021;Selimefendigil and S irin, 2021;Gürbüz et al, 2020b;Çiftçi and Sözen, 2020;Gürbüz et al, 2022a;Khanlari et al, 2022;Sözen et al, 2021b). To increase heat transfer from both cold and hot sides and to increase the efficiency of TE device, efficient heat exchangers should be placed at the junctions.…”

Section: Numerical Resultsmentioning

confidence: 99%

Computational fluid dynamics simulation and experimental investigation of a thermoelectric system for predicting influence of applied voltage and cooling water on cooling performance

Ceviz

Afshari

Muratçobanoğlu

et al. 2022

HFF

View full text Add to dashboard Cite

Purpose The purpose of this paper is to experimentally and numerically investigate the cooling performance of the air-to-water thermoelectric cooling system under different working conditions. Design/methodology/approach An air-to-water thermoelectric cooling system was designed and manufactured according to the principle of discrete binary thermoelectric Peltier modules, and the thermal performance, heat transfer rate and average COP values were examined at different cooling water temperatures and voltages applied. Additionally, numerical simulations were performed by computational fluid dynamics approach to investigate the temperature distribution and airflow structure inside the cooling chamber. Findings Analyses were performed using experimental tests and numerical methods. It was concluded that, by decreasing the cooling water temperature from 20 to 5 °C, the average COP increases about 36%. The voltage analysis showed that the efficiency of the system does not always increase as the voltage rises; more importantly, the optimum voltage is different and depends on whether it is desired to increase COP or increase the cooling rate. Originality/value In the studies published in the field of thermoelectric cooling systems, little attention has been paid to the voltage applied and its relationship to other operating conditions. In most cases, the tests are performed at a constant voltage. In this study, several options, including applied voltage and cooling water temperature, were considered simultaneously and their effects on performance have been tested. It was found that under such studies, optimization work should be done to evaluate maximum performance in different working conditions.

show abstract

Section: Numerical Resultsmentioning

confidence: 99%

Computational fluid dynamics simulation and experimental investigation of a thermoelectric system for predicting influence of applied voltage and cooling water on cooling performance

Ceviz

Afshari

Muratçobanoğlu

et al. 2022

HFF

View full text Add to dashboard Cite

show abstract

“…The maximum enhancement in Nu and TPF of the present study is compared with previous similar literature studies in Table 5. Trapezoidal ribs produce greater enhancement in Nu and TPF values than arc-shaped ribs, 21 circular-sectioned ribs, 8 perforated baffles, 43 and V-shaped ribs. 49 Enhancement in the heat transfer values was obtained higher than Mahanand and Senapati.…”

Section: Thermal Performance Factormentioning

confidence: 93%

“…The TPF should be greater than unity for better heat transmission with less pumping force. The mathematical relation for TPF, 43

\mathrm{TPF}=\frac{\left(\frac{\bar{N{u}_{{\rm{r}}}}}{\bar{N{u}_{{\rm{s}}}}}\right)}{{\left(\frac{\bar{{f}_{{\rm{r}}}}}{\bar{{f}_{{\rm{s}}}}}\right)}^{1/3}}.

…”

Section: Computational Methodologymentioning

confidence: 99%

“…The TPF should be greater than unity for better heat transmission with less pumping force. The mathematical relation for TPF, 43…”

Section: Performance Parametersmentioning

confidence: 99%

“…V‐groove type SAH has a maximum average thermal efficiency of 16.7% and 29.6% greater than double pass and parallel pass SAH, respectively. To enhance the rate of heat transfer in SAH, Khanlari et al 43 have used perforated baffles and nano‐enhanced absorber coating. The maximum thermal efficiency was 5.7%, and the maximum exergy efficiency is 10.5% higher with a nano‐enhanced absorber compared to nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Energy and exergy analysis of solar air heater with trapezoidal ribs based absorber: A comparative analysis

Gogada

Roy

Gupta

et al. 2022

Energy Science & Engineering

View full text Add to dashboard Cite

The performance of a solar air heater (SAH) is computationally investigated in this study using COMSOL multiphysics software. The present study aims to enhance the performance of smooth SAH with the help of artificial roughness. To achieve the goal, trapezoidal ribs above (Model 1) and below (Model 2) the absorber were fixed. The thermo‐hydraulic characteristics of smooth SAH were compared with the thermo‐hydraulic performances of Model 1 and Model 2. The computations were made by varying the heat flux between 600 and 1000 W/m2, Reynolds number from 4000 to 7000, relative rib height (h/H) from 0.2 to 0.7, and a constant pitch of 15 mm. The maximum enhancement in Nusselt number (Nu) compared to smooth duct was 5.54 times for Model 1 and 5.42 times for Model 2 at a h/H = 0.7 at Re = 7000. The maximum increase in friction factor was 36.97 times more than the smooth duct. The thermal performance factor (TPF) at 1000 W/m2 ranged from 1.29 to 1.72 for Model 1 and 1.27 to 1.68 for Model 2. It is found that trapezoidal ribs of Model 1 with h/H of 0.6 has delivered a maximum TPF of 1.72 at Re = 7000. The optimized relative rib height was found to be 0.6. The maximum exergy efficiency of 10.40% was obtained for Model 1 with h/H of 0.6 and at 1000 W/m2.

show abstract

The thermal impact of stored water as supplementary energy source for a solar air heater

Semai,

Bouhdjar

2023

Env Prog and Sustain Energy

View full text Add to dashboard Cite

Solar energy system optimization is a critical consideration for expanding its reach and competitiveness against traditional energy sources. This study specifically targets solar flat plate collectors, focusing on the concept of solar air collectors with an innovative enhancement strategy. To fulfill energy requirements across various applications like heating and drying, setting up collector arrays, such as solar air and water heaters, becomes imperative for meeting desired energy outputs. This research employs numerical analysis to investigate the energy efficiency of a modified solar air heater (MSAH). The enhancement involves integrating a parallelepiped enclosure filled with water, connected to a solar flat plate water collector, into the collector's rear. This water‐filled enclosure serves as a storage tank for the solar water heater. Simulation using the Fluent CFD code is conducted based on meteorological conditions at the Renewable Energy Development Center (CDER) in Bouzaréah, Algeria. Numerical outcomes are compared with experimental findings. Results indicate the positive impact of utilizing the water storage tank as an additional energy source. This modification leads to a substantial 57% performance increase in the MSAH compared with the standard version. This elevated efficiency remains consistent even during periods of reduced solar radiation, owing to the supplementary energy contribution from the solar water heater. In contrast, the standard version's performance hinges solely on available solar radiation for energy generation. This research underscores the potential of combining solar air and water heaters to enhance solar energy systems' efficiency and dependability, facilitating their practical implementation and sustainable utilization.

show abstract

Energy and exergy analysis of a vertical solar air heater with nano-enhanced absorber coating and perforated baffles

Cited by 82 publications

References 74 publications

Computational fluid dynamics simulation and experimental investigation of a thermoelectric system for predicting influence of applied voltage and cooling water on cooling performance

Computational fluid dynamics simulation and experimental investigation of a thermoelectric system for predicting influence of applied voltage and cooling water on cooling performance

Energy and exergy analysis of solar air heater with trapezoidal ribs based absorber: A comparative analysis

The thermal impact of stored water as supplementary energy source for a solar air heater

Contact Info

Product

Resources

About