A comparison between flat-plate and evacuated tube solar collectors in terms of energy and exergy analysis by using nanofluid

Eltaweel, Mahmoud; Abdel‐Rehim, Ahmed A.; Attia, Ahmed A.A.

doi:10.1016/j.applthermaleng.2020.116516

Cited by 52 publications

(16 citation statements)

References 46 publications

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“…In stationary type, the flat‐plate and evacuated tube is the most common collectors that are used (Figure 4). There are several studies that compare two types of the collectors 29‐32 . Evacuated tubes utilize the sun's energy effectively and then are able to achieve higher temperatures than Flat‐plate collectors for two reasons.…”

Section: Nanofluids Applications and Challengesmentioning

confidence: 99%

The role of nanofluids on enhancing the solar energy performance with focusing on the mining industry

Molaei

Siavoshi

2021

Intl J of Energy Research

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Solar energy systems are one of the most effective replacements for traditional fossil fuels because of their capability to turn solar energy directly into heat and electricity with no harmful environmental consequences such as CO 2 production and climate change. Despite the challenges and motivations, the implementation of solar energy is still slow in the mining industry. There are many opportunities to bring this new technology to mine sites. The most important objective of switching to renewable energies is increasing the efficiency of solar panels and decreasing the cost of energy production. Improving the thermal performance of solar energy systems by using nanofluids with superior thermophysical properties is a viable option. In this paper, the fundamental parameters, which improve the nanofluid properties and make the solar systems more cost-effective are reviewed.

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Section: Nanofluids Applications and Challengesmentioning

confidence: 99%

The role of nanofluids on enhancing the solar energy performance with focusing on the mining industry

Molaei

Siavoshi

2021

Intl J of Energy Research

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“…Research in Thailand has explored the potential of using a flat plate solar collector as a solar receiver in the ethanol distillation process, with the results showing an increase in the ethanol concentration. It was found that the distillation process using the flat plate solar collector can increase the substrate concentration from 10% to 40-50% in a single stage and up to 90% with multi-stage distillation [18,19]. Previous research has also explored the potential of utilizing thermal energy from solar radiation in ethanol distillation with solar collectors [20,21].…”

Section: Introductionmentioning

confidence: 99%

Efficiency of Semi-Automatic Control Ethanol Distillation Using a Vacuum-Tube Parabolic Solar Collector

Pisitsungkakarn

Neamyou

2022

Energies

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Thailand is an agricultural country with several agro-industrial by-products that can be processed into fuels. Although producing ethanol from agro-industrial by-products is an interesting option, the process of distilling ethanol from fermented agricultural products requires a high temperature to increase the ethanol concentration from 10% to 95%. In this research, solar ethanol distillation equipment incorporating a solar parabolic collector with a vacuum heat absorber tube to increase efficiency by reducing heat loss was designed and developed. An electronic device was used to control the distillation process, maintain the required temperature, and make suitable adjustments to the solar radiation acceptance angles of the parabolic solar collector. Ethanol dilution at concentrations of 10%, 15%, and 20%, and Sato (Thai Rice Wine) were used as the reactant in the distillation process. The result of distilling ethanol distillation with a semi-automatic control using a vacuum-tube parabolic solar collector showed that the thermal efficiency of the receiver was 12.61%, 13.93%, 18.58%, and 17.40%, respectively. The thermal efficiency of the heat exchanger was 11.27%, 10.76%, 13.35%, and 12.35%, respectively. The final concentration of ethanol was 67%, 76%, 82%, and 80%, respectively, and the amount of the distilled ethanol was 330 mL, 352 mL, 398 mL, and 360 mL, respectively.

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“…A literature review shows that existing studies focus primarily on comparing, in terms of energy, vacuum collectors with flat collectors [64][65][66][67][68][69][70][71][72][73][74]. In the majority of instances, the evacuated tube collector exhibits better efficiency compared to the flat collector.…”

Section: Introductionmentioning

confidence: 99%

“…Whereas, there are few studies that examine the ecological aspect of solar systems based on the vacuum tube technology. There are studies that investigate the life cycle of solar collectors; however, the majority of them are based on Embodied Energy (EE) and Embodied Carbon (EC) along with USEtox and Ecological Footprint (EF), or life cycle cost analysis [16,18,20,27,28,54,63,65,68,73,[75][76][77]. Few studies consider the LCA methodology for a perspective based on actual pollutant for impact assessment individually with a single score [59,78,79].…”

Section: Introductionmentioning

confidence: 99%

“…Although the presented methods could be more attractive than LCA owing to the simplicity of approach, yet they include only one index, which might result in an excessive simplification of the analysis made. A considerable number of works related to environmental analysis include comparison of the evacuated tube collector with the flat collector [64][65][66][67][68][69][70]73]. The results show that, for the majority of cases examined, the vacuum collector system is more environmentally friendly than the flat collector system.…”

Section: Introductionmentioning

confidence: 99%

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Life Cycle Assessment of the Use of Phase Change Material in an Evacuated Solar Tube Collector

Jachura

Sekret

2021

Energies

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This paper presents an environmental impact assessment of the entire cycle of existence of the tube-vacuum solar collector prototype. The innovativeness of the solution involved using a phase change material as a heat-storing material, which was placed inside the collector’s tubes-vacuum. The PCM used in this study was paraffin. The system boundaries contained three phases: production, operation (use phase), and disposal. An ecological life cycle assessment was carried out using the SimaPro software. To compare the environmental impact of heat storage, the amount of heat generated for 15 years, starting from the beginning of a solar installation for preparing domestic hot water for a single-family residential building, was considered the functional unit. Assuming comparable production methods for individual elements of the ETC and waste management scenarios, the reduction in harmful effects on the environment by introducing a PCM that stores heat inside the ETC ranges from 17 to 24%. The performed analyses have also shown that the method itself of manufacturing the materials used for the construction of the solar collector and the choice of the scenario of the disposal of waste during decommissioning the solar collector all play an important role in its environmental assessment. With an increase in the application of the advanced technologies of materials manufacturing and an increase in the amount of waste subjected to recycling, the degree of the solar collector’s environmental impact decreased by 82% compared to its standard manufacture and disposal.

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A comparison between flat-plate and evacuated tube solar collectors in terms of energy and exergy analysis by using nanofluid

Cited by 52 publications

References 46 publications

The role of nanofluids on enhancing the solar energy performance with focusing on the mining industry

The role of nanofluids on enhancing the solar energy performance with focusing on the mining industry

Efficiency of Semi-Automatic Control Ethanol Distillation Using a Vacuum-Tube Parabolic Solar Collector

Life Cycle Assessment of the Use of Phase Change Material in an Evacuated Solar Tube Collector

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