Performance Analysis and Identification of an Indirect Photovoltaic Thermal Dryer with Aluminum Oxide Nano-Embedded Thermal Energy Storage Modification

Şirin, Ceylin; Selimefendigil, Fatih; Öztop, Hakan F.

doi:10.3390/su15032422

Cited by 35 publications

(3 citation statements)

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“…Performance parameters such as convective heat transfer coefficient, top loss coefficient, back loss coefficient, and overall loss coefficient have been determined by using Equations (1)–(10), respectively as presented below (Behera et al, 2023). Similarly, collector efficiency and collector efficiency factor has been obtained by using Equations (11)–(12) (Rai, 1995): Also initial moisture content of drying products and drying efficiency has been calculated by using Equations (13)–(14) (Şirin et al, 2023).

Hydraulic diameter, d_{h} goodbreak= 2 goodbreak\times spacing between the lower glass plate and absorbing plate

{Reynolds}^{'} s number, Re = \frac{{Vd}_{h}}{ν}

where V = velocity of air at the inlet of the collector in m/s,

ν

= kinematic viscosity of air in m 2 /s.

{From Kaya}^{'} s data, Nusselt number, Nu = 0.0158 {Re}^{0.8}

Heat transfer coefficient, h = \frac{Nu . k}{d_{h}} in W / {normalm}^{2} ° C

where k = thermal conductivity of air in W/m°C.…”

Section: Resultsmentioning

confidence: 99%

“…The instantaneous efficiency and temperature at the outlet of the air heater increase up to 69% and 94°C, respectively. Şirin et al (2023) have done performance testing on an indirect photovoltaic dryer integrated with a thermal energy storage air collector with and without using Aluminum oxide nanoparticles. By using nanoparticles in thermal energy storage units, the overall energy efficiency has been improved by 40.07%.…”

Section: Introductionmentioning

confidence: 99%

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Thermal performance of a hybrid solar dryer through experimental and CFD investigation

Behera

Mohanty

2023

J Food Process Engineering

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Solar drying comes under clean energy technology that aims to dry food products hygienically. The present work discusses the development of an energy‐efficient and cost‐effective hybrid‐type solar dryer for drying 15 kg of food products. Experiments and CFD modeling of the solar drying system have been carried out for drying tomato slices. The maximum efficiency of the collector has been obtained as 74.1% and 66.96%, respectively with and without using exhaust hot air recirculation. Performance indicators such as convective heat transfer coefficient, overall loss coefficient, drying efficiency, and collector efficiency factor have been obtained as 7.743685 W/m2°C, 5.94189 W/m2°C, 32.89%, and 0.987%, respectively. The coefficient of determination (R2) is calculated as 0.9863, 0.9919, and 0.9755 for the first, second, and third day, respectively, representing a higher order of fit of getting a performance evaluation of the collector. A p‐value is obtained as 0.49375 (>0.05) from a paired sample t‐test signifying no statistical significance difference between the predicted and actual experimental results of collector efficiency. For a constant mass flow rate of air, the maximum temperature inside the drying chamber and wall radiative heat flux obtained from experiments and CFD simulation are in good agreement, thus satisfying the validation. Further, the dryer can be used during the night time by using an electric coil producing a satisfactory drying effect. It is lightweight and easily portable to capture maximum solar radiation. Practical applications The present solar dryer is most suitable for drying applications in food processing industries due to the clean and hygienic process of drying. It is easily portable to any location to capture maximum solar radiation. It is lightweight and has low construction, and maintenance costs. It is the most efficient and fast drying compared to open sun drying and can be used for large‐scale drying in industrial applications. The present study is about CFD simulations of the solar dryers for drying 5 kg of tomato slices. The drying efficiency has been increased by utilizing exhaust hot air circulation. Both the simulation and experimental results have been validated and further dryer has been used during night time by using an auxiliary heating element.

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Hydraulic diameter, d_{h} goodbreak= 2 goodbreak\times spacing between the lower glass plate and absorbing plate

{Reynolds}^{'} s number, Re = \frac{{Vd}_{h}}{ν}

where V = velocity of air at the inlet of the collector in m/s,

ν

= kinematic viscosity of air in m 2 /s.

{From Kaya}^{'} s data, Nusselt number, Nu = 0.0158 {Re}^{0.8}

Heat transfer coefficient, h = \frac{Nu . k}{d_{h}} in W / {normalm}^{2} ° C

where k = thermal conductivity of air in W/m°C.…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Thermal performance of a hybrid solar dryer through experimental and CFD investigation

Behera

Mohanty

2023

J Food Process Engineering

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“…While there is some available literature on ITSDs, there is currently no specific study that comprehensively addresses their features, types, energy storage techniques, and performance. This review aims to fill this gap by thoroughly examining ITSD research and providing meaningful insights [19,31,32]. It explores various ITSD designs, operating characteristics, and energy storage techniques.…”

Section: Introductionmentioning

confidence: 99%

Review of recent advancement in performance, and thermal energy storage studies on indirect solar dryers for agricultural products.

Shekata,

Tibba,

Baheta

2023

IOP Conf. Ser.: Mater. Sci. Eng.

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Efficient drying methods and post-harvest processes are crucial to reduce waste in fruits, vegetables, and agricultural products. Factors like moisture-related deterioration, climate change, mishandling, delayed shipping, improper storage, and sales delays contribute to post-harvest losses and quality degradation. Solar dryers, especially indirect-type solar dryers, provide a practical and environmentally friendly way to preserve these goods. In comparison to other types of solar dryers, indirect-type dryers have a number of advantages. This review focuses on evaluating the performance of different configurations of Indirect-type solar dryers in terms of drying time, maximum air temperature, drying efficiency for collectors, and overall dryer efficiency. The influence of various operating conditions on the thermal efficiency of Indirect-type solar dryers is also investigated. The study provides detailed information on the sensible and latent storage units and materials used in Indirect-type solar dryers, including those operating through natural or forced convection. The review also explores the utilization of advanced technologies, such as desiccant systems, recycling processes, the use of Nano fluids and nanoparticles, and thermal energy storage, to enhance the thermal performance of solar dryers. Additionally, the paper examines potential difficulties and suggestions for selecting, using, and testing thermal storage for indirect-type solar dryers. In summary, this review provides a comprehensive examination of indirect-type solar dryers, and their performance. It highlights the potential for improving drying efficiency through the integration of advanced technologies and thermal energy storage.

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A comparative study on thermal conductivity of multi-walled carbon nanotubes/expanded graphite/graphene enhanced molten nitrate salt: a review

Li,

Noor,

Hongkun

et al. 2024

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Performance Analysis and Identification of an Indirect Photovoltaic Thermal Dryer with Aluminum Oxide Nano-Embedded Thermal Energy Storage Modification

Cited by 35 publications

References 100 publications

Thermal performance of a hybrid solar dryer through experimental and CFD investigation

Thermal performance of a hybrid solar dryer through experimental and CFD investigation

Review of recent advancement in performance, and thermal energy storage studies on indirect solar dryers for agricultural products.

A comparative study on thermal conductivity of multi-walled carbon nanotubes/expanded graphite/graphene enhanced molten nitrate salt: a review

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