Hybrid Photovoltaic/Thermal (HPV/T) Systems: From Theory to Applications

Cüce, Erdem; Oztekin, Erman Kadir; Cuce, Pınar Mert

doi:10.3844/erjsp.2018.1.71

Cited by 10 publications

(6 citation statements)

References 296 publications

(375 reference statements)

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“…Solar energy is believed in having the greatest potential among the other renewable energy technologies in order to compete with fossil fuel based energy sources (Cuce et al, 2018). It is easy to underline that solar energy has numerous applications covering solar electricity, solar thermal and conventional or concentrating cogeneration technologies (Daneshazarian et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Performance Assessment of Solar Chimneys: Part 2 – Impacts of Slenderness Value and Collector Slope on Power Output

Cüce¹,

Cuce²

2019

Energy Research Journal

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In the previous part, impacts of chimney height thus pressure difference on the power output of solar chimneys have been numerically evaluated. Within the scope of this research, slenderness and slope of collector are analysed in terms of their potential influence on average velocity of air at the chimney inlet. The analyses are based on a commercial and reliable CFD software ANSYS FLUENT. Chimney height is considered to be 100 m in the research and the chimney diameter is varied through a dimensionless parameter (β). Basically, β is defined as inverse slenderness and its value of 0.1 corresponds to a chimney diameter of 10 m as expected. Average velocity of air at the chimney inlet is numerically assessed for the β values in the range of 0.1-0.5. Collector slope is also investigated in the analyses through a dimensionless parameter (δ). The term δ is defined as the ratio of inlet height of collector to the collector height at the centre. Similarly, average velocity of air at the chimney inlet is determined for the δ values in the range of 0.2-1.0. The analyses are conducted for a constant solar intensity of 200 W/m 2 . The chimney height at the centre is taken to be 4 m in the slenderness analyses and 10 m in the collector slope assessments. The height of collector inlet is constant and 1 m in the slenderness research. On the other hand, it is varied from 2 to 10 m in the collector slope analyses. The results reveal that the velocity figures exponentially decrease from 15.93 to 11.85 m/s when the β value rises from 0.1 to 0.5. On the contrary, velocity figures increase with increasing δ value, the enhancement is determined to be about 23%.

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Section: Introductionmentioning

confidence: 99%

Performance Assessment of Solar Chimneys: Part 2 – Impacts of Slenderness Value and Collector Slope on Power Output

Cüce¹,

Cuce²

2019

Energy Research Journal

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“…Solar energy is ascribed to have the greatest potential among the other renewable energy technologies to be able to mitigate the dominant impact of fossil fuel based energy economy at global scale (Cuce et al, 2018). There is a wide range of solar energy applications from solar thermal to solar electricity as well as concentrating cogeneration and trigeneration technologies (Daneshazarian et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Performance Assessment of Solar Chimneys: Part I – Impact of Chimney Height on Power Output

Cüce¹,

Cuceb²

2019

Energy Research Journal

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Solar chimney is a truly sustainable and green energy technology, which is a potential alternative to carbon-based energy economy. The working principle of solar chimneys is based on the buoyant nature of air to turn a turbine that produces electrical power. Solar chimneys are highly in the centre of interest among all solar energy applications since they enable both day and night time operation owing to greenhouse and chimney effects. A typical solar chimney consists of three main parts as chimney, collector and turbine. When the in-situ applications of solar chimneys are gone through, it can be easily asserted that the driving force in electricity generation comes from the chimney effect as a consequence of the notable pressure differences between the inlet and outlet of the chimneys. In most cases, the greenhouse effects on power output are considered auxiliary only due to non-optimised geometric properties for the air medium beneath the collector. Within the scope of this CFD research, the impacts of chimney height on power output of a typical solar chimney are evaluated. A commercial and reliable CFD software ANSYS FLUENT is considered for the numerical analyses. For different chimney heights, the average velocity at the inlet of chimney in which the turbine is placed is determined by applying k-ε turbulence model, continuity, momentum and energy equations for a 2D model. The results reveal that there is an exponential relationship between the pressure difference and the average air velocity and the solar chimney is found to be practical after a certain value of chimney height. For a chimney and collector diameter of 10 and 1000 m, respectively, the average velocity at the inlet of chimney is calculated to be 25.17 m/s for a chimney height of 100 m, whereas it is 18.06 m/s for the height of 50 m. The findings are of vital importance in terms of feasibility studies on solar chimneys since they give a clear understanding about the influence of chimney height on the electrical power output of any solar chimney power plant.

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“…Direct conversion of sunlight into electricity through the photovoltaic effect is in the centre of interest over the last four decades, and intensive efforts take place all over the world to improve the electrical performance figures of photovoltaic (PV) cells and modules [3]. It is well-documented in literature that thermodynamic efficiency parameters of PV modules are notably affected by cell temperature, which is usually encountered in hot and temperate climatic conditions [4]. Dramatic drop in power outputs of PV modules with increasing cell temperatures is attributed to the notable cell temperature dependency of voltage parameters [5].…”

Section: Introductionmentioning

confidence: 99%

Impact of humidity on current parameters of solar cells

Cüce

Cuce

Bali

2018

Journal of Energy Systems

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In this research, impacts of relative humidity on current parameters of solar cells are investigated. An experimental methodology is considered in the research. Outdoor tests are carried out for two different cell technologies, monocrystalline (m-Si) and polycrystalline silicon solar cell (p-Si), under various humidity conditions. Current-voltage (I-V) and power-voltage (P-V) characteristics are achieved simultaneously for each sample, and the relationship between the short circuit current (I sc ) and relative humidity is discussed. During the tests, cell temperature of m-Si and p-Si sample is measured to be in the range of 22.9-36.1 and 21.2-38.9 o C, respectively. It is unequivocally reported in literature that current parameters are not noticeably affected by the rise in cell temperature up to 20 o C. Therefore, any deviation from the linearity between solar intensity level (G) and I sc is attributed to the impact of relative humidity. The tests repeated for low and moderate solar intensity levels (257-482 W/m 2 ) reveal that the linear relationship between G and I sc is maintained for different humidity levels. In this respect, the impact of humidity level on current parameters of solar cells is found to be insignificant

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Hybrid Photovoltaic/Thermal (HPV/T) Systems: From Theory to Applications

Cited by 10 publications

References 296 publications

Performance Assessment of Solar Chimneys: Part 2 – Impacts of Slenderness Value and Collector Slope on Power Output

Performance Assessment of Solar Chimneys: Part 2 – Impacts of Slenderness Value and Collector Slope on Power Output

Performance Assessment of Solar Chimneys: Part I – Impact of Chimney Height on Power Output

Impact of humidity on current parameters of solar cells

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