Study of the effect of truncation on the optical and thermal performances of an ICS solar water heater system

Benrejeb, Raouf; Helal, Olfa; Chaouachi, Béchir

doi:10.1016/j.solener.2016.02.057

Cited by 8 publications

(2 citation statements)

References 17 publications

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“…To close the whole transport equations (1), ( 2) and ( 3), the turbulence model k-ε, (8) and (9) was used. This model has the advantage of not requiring very large computation times, especially for simple cases such as the one we are studying.…”

Section: Equations Of the Problemmentioning

confidence: 99%

“…The function of a thermal energy storage unit is to absorb and store heat energy. Hence, solar heaters can be operated for a longer period of time during sunset [9] R. Benrejeb et al Consequently, in recent years, several studies have focused on the development of solar energy systems, particularly the optimal use of solar radiation and the best ways to store solar thermal energy.…”

Section: Introductionmentioning

confidence: 99%

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Numerical approach of a fully developed flow in a solar collector adapted to the climate of southwest Algeria

Hami¹,

Abdelkrim²,

Draoui

2020

J. Ren. Energies

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The present work has been conducted with the aim of contribution to the study of heat transfer phenomena in an air solar collector, which deal with transient heat transfer properties and mechanisms.The improvement of heat transfer in the studied system is characterized by the development of the flow between the absorption of cold air and the evacuation of hot air.The equations, which govern the problem dealt with, are those of turbulent and incompressible flows written in Reynolds decomposition for velocity, pressure and temperature, in a mean component and a term of fluctuation, and expressing the conservation of the mass, of the amount of movement and energy.To close the set of transport equations, the turbulence model k-E was used. We will therefore use this model of turbulence with an improved treatment of wall laws (Enhanced wall treatment), with the intention of solving the laminar sub-layer. The simulation results obtained are valid for temperature values between (30 °C - 50 °C) for heating flows between (200 w / m2 - 800 w / m2), the average volume flow obtained is equal to: 0.3 m3/s. These results are essential for the passive heating of buildings and the drying of agrifood products.

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Section: Equations Of the Problemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical approach of a fully developed flow in a solar collector adapted to the climate of southwest Algeria

Hami¹,

Abdelkrim²,

Draoui

2020

J. Ren. Energies

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Performance evaluation of single stand and hybrid solar water heaters: a comprehensive review

Rahimi-Ahar

Khiadani

Ahar

et al. 2023

Clean Techn Environ Policy

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In this review, flat plate and concentrate-type solar collectors, integrated collector–storage systems, and solar water heaters combined with photovoltaic–thermal modules, solar-assisted heat pump solar water heaters, and solar water heaters using phase change materials are studied based on their thermal performance, cost, energy, and exergy efficiencies. The maximum water temperature and thermal efficiencies are enlisted to evaluate the thermal performance of the different solar water heaters. It is found that the solar water heaters’ performance is considerably improved by boosting water flow rate and tilt angle, modification of the shape and number of collectors, using wavy diffuse and electrodepositioned reflector coating, application of the corrugated absorber surface and coated absorber, use of turbulent enhancers, using thermal conductive working fluid and nanofluid, the inclusion of the water storage tank, and tank insulation. These items increase the heat transfer area and coefficient, thermal conductivity, the Reynolds and Nusselt numbers, heat transfer rate, and energy and exergy efficiencies. The evacuated tube heaters have a higher temperature compared to the collectors with a plane surface. Their thermal performance increases by using all-glass active circulation and heat pipe integration. The concentrative type of solar water heaters is superior to other solar heaters, particularly in achieving higher water temperatures. Their performance improves by using a rotating mirror concentrator. The integration of the system with energy storage components, phase change materials, or a heat pump provides a satisfactory performance over conventional solar water heaters. Graphical abstract Modification of solar water heaters

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A comprehensive study on the effects of truncation positions of the compound parabolic concentrator eliminating multiple reflections on the performances of concentrating photovoltaic and thermal system

Zhang

Wei

Zhang

et al. 2021

Applied Thermal Engineering

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Study of the effect of truncation on the optical and thermal performances of an ICS solar water heater system

Cited by 8 publications

References 17 publications

Numerical approach of a fully developed flow in a solar collector adapted to the climate of southwest Algeria

Numerical approach of a fully developed flow in a solar collector adapted to the climate of southwest Algeria

Performance evaluation of single stand and hybrid solar water heaters: a comprehensive review

A comprehensive study on the effects of truncation positions of the compound parabolic concentrator eliminating multiple reflections on the performances of concentrating photovoltaic and thermal system

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