Thermal performance of flat plate solar water collector using air bubble injection

Jawad, Sarah Abbas; Redha, Zeina Ali Abdul; Rashid, Farhan Lafta

doi:10.1063/5.0133663

Cited by 2 publications

(1 citation statement)

References 8 publications

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“…Jawad et al [38] studied what would happen if tiny bubbles of air were injected into a water stream moving through a copper tube wound in a double spiral configuration, with a length of 15 meters, a diameter of 0.012 meters, and 11 turns. A matte black paint containing a nanomaterial (thermal dye with 5% of TiN) was also used to coat the inside of the solar collector.…”

Section: Review Of Air Bubble Injection In Solar Collectormentioning

confidence: 99%

An Examination of Air-Bubble Injection Mechanisms for Optimising Heat Transfer in Industrial Applications

Rashid,

Basem,

Al-Obaidi

et al. 2023

IJHT

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The optimisation of heat transfer, which is the transition of thermal energy from regions of high temperature to those of lower temperature, is a cornerstone in the field of thermal sciences and engineering. It is of vital importance to maximise energy efficiency, ensure system performance, and uphold operational reliability across numerous industrial applications. In this context, recent investigations have explored the modification of heat transfer rates through the turbulence induced by air-bubble injections. The technique has found application in heat exchangers, solar stills, and solar collectors, where it can be employed to either augment or attenuate heat transmission. The majority of the research has been dedicated to enhancing thermal efficiency, with both theoretical models and experimental data underpinning our current understanding. This review provides a critical analysis of over 45 studies from the literature, which have examined the implications of air bubble injection across various realms of industry, including heat exchangers, water desalination systems, solar collectors, and diverse media. Our analysis underscores the profound impact of heat transfer rates on process productivity, efficiency, and costeffectiveness across a gamut of applications. A range of industrial processes, such as cooling, heating, evaporation, and condensation, all rely heavily on efficient heat exchange. Enhancements in heat transfer rates hold the potential to curtail energy losses, reduce fuel consumption, and subsequently lower operational costs in industrial applications like solar thermal systems. Moreover, efficient heat transfer is pivotal in minimising temperature variations, thereby contributing to consistent outcomes.

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Section: Review Of Air Bubble Injection In Solar Collectormentioning

confidence: 99%

An Examination of Air-Bubble Injection Mechanisms for Optimising Heat Transfer in Industrial Applications

Rashid,

Basem,

Al-Obaidi

et al. 2023

IJHT

View full text Add to dashboard Cite

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Numerical investigation of the effect of an air layer on the melting process of phase change materials

Khalaf,

Rashid,

Al-Obaidi

et al. 2024

Mater Renew Sustain Energy

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Designing more effective thermal energy storage devices can result from understanding how air layers impact the melting process. The total efficiency of these systems can be improved by optimizing the melting process of the phase change materials (PCMs), which are utilised to store and release thermal energy. The current study utilises an analysis to evaluate how an air layer would affect melting of the PCM. The enthalpy-porosity combination based ANSYS/FLUENT 16 software is specifically used to accomplish this study, considering the paraffin wax (RT42) as the PCM. The study reveal that the presence of an air layer would impact the dissolution process. This result is assured an increase of melting time of PCM by 125% as a result to having an air layer of 5 cm thickness compared to a cell without an air layer. Furthermore, an increase of the layer thickness beyond 5 cm has a progressive effect on the melting time of PCM. One important component that affects the melting process is the existence of an air layer above the cell. Greater heat transfer resistance from thicker air layers prolongs the time needed to finish melting. The efficient heat transmission of PCM is shown to be reduced when there is an air layer above the cell. The melting process gradually slows down as the air layer thickness rises, which reflects the decreased heat transmission. These results highlight how crucial it is to take the environment into account while creating PCM-filled energy storage cells.

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Thermal performance of flat plate solar water collector using air bubble injection

Cited by 2 publications

References 8 publications

An Examination of Air-Bubble Injection Mechanisms for Optimising Heat Transfer in Industrial Applications

An Examination of Air-Bubble Injection Mechanisms for Optimising Heat Transfer in Industrial Applications

Numerical investigation of the effect of an air layer on the melting process of phase change materials

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