Single Phase Natural Circulation Flow through Solar Evacuated Tubes Collectors on the Equatorial Zone

Recalde, Celso; Cisneros, César; Ávila, Carlos; Logroño, Washington; Recalde, Mayra

doi:10.1016/j.egypro.2015.07.424

Cited by 11 publications

(9 citation statements)

References 3 publications

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“…The ST products also need some inclination for the internal thermosiphoning effect of the refrigerant, and also because the roofs' slopes favour natural rain cleaning. Also, it is confirmed that in the equatorial zone, if the tilt angle decreases, the harnessed energy that is converted into heat increases and, therefore, higher water temperatures are achieved [12]. This may be due to the incidence area of solar radiation increase therefore captured energy increase.…”

Section: Resultsmentioning

confidence: 72%

“…The model also shows that the solar fraction increases if the collector area does, the number of collectors, and also when the requirement of water temperature decreases [12]. However, the number of the collectors could be increased if the required water temperature increases, this to compensate the missing solar fraction.…”

Section: Resultsmentioning

confidence: 92%

“…The Andean equatorial zone offers a high potential for the implementation of ST technologies. This part of the planet is a privileged place due to high solar radiation rates that can be used for thermal applications [12] and photovoltaic electricity production [13], [14]. In this region there is a constant weather condition, and direct and diffuse solar radiation as well through the year, they also have a growing demand for energy, and thermal requirements have notably increased [15]- [17].…”

Section: Introductionmentioning

confidence: 99%

“…In the ETCs, a long plate with a heat tube exchanger is inside a vacuum sealed glass tube. As there is low amounts of air inside the tube or air in stationary state, which allows convection losses to be very low, which means higher efficiency in cold climates [12], [24], [25]. Given the occurrence of climate oscillation in the region, temperatures vary from cold to moderately warm, thus causing high and constant levels of both direct and diffuse radiation.…”

Section: Introductionmentioning

confidence: 99%

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Modelling of solar thermal energy for household use in equatorial latitude by using the F-Chart model

Astudillo-Flores

Zalamea-León²,

Barragán-Escandón³

et al. 2024

RE&PQJ

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The Andean Equatorial Region, due to its geographic location, shows great potential for using solar energy. Solar thermal energy is of interest in the residential sector in Ecuador and other Andean countries as a method to avoid fossilderived fuels consumption. However, previous learnings of the operation of solar water heating systems in other latitudes cannot be used in the conditions of Ecuador. Thus, the performance of the solar thermal energy systems in this geographic region deserves further study that consider typical high levels of cloudiness and fast climate oscillations. The objective of this work was to investigate the effect of the orientation of solar thermal plates on their energy efficiency and model the behaviour of these systems to predict their operation under Equatorial Andean climate conditions. For the F-Chart calibration different slopes angles were used, according to the typical roofs slopes in Cuenca, Ecuador. Results showed a monthly solar fraction, contributed by an evacuated tube collector is 26% higher than the flat plate collectors. The results also depict that, in the conditions of Cuenca, the greater solar water heating occurs when the collector is inclined 14° and facing towards the south. These findings can be used to predict the best operational conditions for using solar thermal energy collectors to produce hot water in the residential sector under equatorial highland altitude conditions.

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Section: Resultsmentioning

confidence: 72%

Section: Resultsmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Modelling of solar thermal energy for household use in equatorial latitude by using the F-Chart model

Astudillo-Flores

Zalamea-León²,

Barragán-Escandón³

et al. 2024

RE&PQJ

View full text Add to dashboard Cite

show abstract

“…The flow in parallel pipes exists widely in boilers, steam generators, heatexchanger, boiling water reactors and other devices [1][2][3][4]. To understand such manifold or a geometric structure, a lot work has been done to study the flow distribution among the branches and some other hydraulics characteristics like the static pressure, flow resistance and so on.…”

Section: Introductionmentioning

confidence: 99%

The flow characteristics of two loop tubesin junction at ends

Song¹

2017

Proceedings of the 2nd Annual International Conference on Electronics, Electrical Engineering and Information Science (EEEIS 20

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Aiming at the flow characteristics of tubes, this work analyzed the different cases of inner flow in loop tubeby CFD, and the cases were determined according to the different radius of tube section. The CFD analysis results show that with the increase of radius, the highest velocity at mixing point decreases with a maximum value of 45.22%, but increase at the outlet with a maximum value of 4.79%. There are nonlinear change of flow velocity at the inlet and outlet, and the velocity in the tubes is layered vertically.

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Comparative capacities of residential solar thermal systems versus F-chart model predictions and economic potential in an equatorial-latitude country

Zalamea-León,

Astudillo-Flores,

Barragán-Escandón

et al. 2023

Energy Reports

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Single Phase Natural Circulation Flow through Solar Evacuated Tubes Collectors on the Equatorial Zone

Cited by 11 publications

References 3 publications

Modelling of solar thermal energy for household use in equatorial latitude by using the F-Chart model

Modelling of solar thermal energy for household use in equatorial latitude by using the F-Chart model

The flow characteristics of two loop tubesin junction at ends

Comparative capacities of residential solar thermal systems versus F-chart model predictions and economic potential in an equatorial-latitude country

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