Seasonal temperature variation of solar pond under Mediterranean condition

Soğukpınar, Hacı

doi:10.2298/tsci180518060s

Cited by 6 publications

(7 citation statements)

References 21 publications

(22 reference statements)

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“…Therefore, the optimum number of mesh distribution, more agreement with the experiment were applied and element size was set to coarse. Mesh quality, boundary conditions, and modeling approach were checked previously made numerical models and this configuration was found to be compatible with similar ones 22‐24 . Quality of mesh was also checked in terms of skewness of the mesh element and mesh statistics was generated.…”

Section: Meshing and Boundary Conditionsmentioning

confidence: 95%

“…In this part, the salt‐gradient solar pond was simulated and compared with the experiment to correlate the simulation accuracy of this method. Experimental solar pond with dimension 2 m × 2 m and with a depth of 1.5 m was built in Adana 23 in 2004 and the performance of the system has been investigated since then. In the experiment, the depth of the UCZ, NCZ, and HSZ are 0.1, 0.6, and 0.8 m, respectively.…”

Section: Salt‐gradient Solar Pond Modelmentioning

confidence: 99%

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A new perspective to the conventional solar pond technology to increase the thermal efficiency

Soğukpınar

2020

Env Prog and Sustain Energy

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In this study, a new perspective was introduced to conventional solar pond technology to spread its commercial application. In order to make it more useful with preserving energy efficiency, the brine layers were replaced with the normal freshwater by using a separated transparent partition. Structurally modified three different solar ponds were proposed and numerical investigations were conducted by using discrete ordinate method (DOM). For this, four types of solar ponds were modeled, the first one is the conventional salt‐gradient solar pond and three others are modified versions which are named as “Pure Water Solar Pond.” For all models, a comprehensive finite element method was developed to investigate the daily performance of solar ponds by using commercial software COMSOL. Salt‐gradient solar pond consists of seven layers where one layer is the heat storage zone, five layers are nonconvective zone, and one is the upper convective zone. However, in the modified models, solar ponds consist of two glass layers and one to three pure water zones depending on the model types. The numerical method includes a novel approach to calculate all the zone where absorption, emission, scattering, transmission, convection, and radiation are taken into account. Numerical results for all models were compared with an experiment to correlate the numerical accuracy of the DOM with anisotropic scattering phase function. Results indicate there is a good correlation between these four model approach and the experiment.

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Section: Meshing and Boundary Conditionsmentioning

confidence: 95%

Section: Salt‐gradient Solar Pond Modelmentioning

confidence: 99%

A new perspective to the conventional solar pond technology to increase the thermal efficiency

Soğukpınar

2020

Env Prog and Sustain Energy

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“…29,30 In other studies, heat transfer equations in the discrete ordinate method and Kays-Crawford model were tested and correlated with experiments. 21,31 5 section to along the surface and after reaching the lowest speed at a certain distance, it started to accelerate again excluding 5 cm in the barbs (Figure 5b). Figure 3a indicates that temperature increases from inlet to outlet section due to the slowing down of the wind.…”

Section: Adaptability and Verificationmentioning

confidence: 98%

“…In some other studies, the consistency of numerical study with the SST turbulence model was tested and verified with experimental observation 29,30 . In other studies, heat transfer equations in the discrete ordinate method and Kays‐Crawford model were tested and correlated with experiments 21,31 …”

Section: Adaptability and Verificationmentioning

confidence: 99%

Effect of hairy surface on heat production and thermal insulation on the building

Soğukpınar

2020

Env Prog and Sustain Energy

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In the extreme wind and cold weather conditions, animals have developed incredible protection techniques in order to achieve the regulation of body thermal insulation. While birds fluff their feathers to reduce heat loss, some animals take advantage of the other varying unique structures of the skin. In this study, inspired by birds, the effect of hairy surfaces like hedgehog skin on thermal insulation and also heat production at the low-speed wind on the building wall surface was investigated numerically by using the finite element method. For this, a portion of the wall surface was covered with rigid barbs to increase friction on the wall, and for the comparison, a part of the surface was left smooth without any coating. Menter's shear stress transport (SST) turbulence model by algebraic multigrid solver was used for the modeling of wind motion and heat transfer equations by direct solver PARDISO was used to simulate heat transfer in the solid and fluid environment. According to the numerical calculation, the wind speed slows down along the rough surface, high-pressure zone on the surface (a thick no-slip boundary region) was created and a part of wind energy was converted to extra heat and especially the convective heat loss due to the movement of the wind on the surface was reduced, and finally, the building was insulated further by creating a stagnant air layer in the barbs.

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“…On the other hand, when the mesh number increases a little more in direct analysis models, it becomes impossible for normal computers to solve. The mesh number was determined by taking into account other scientific studies using the same model [9,[20][21][22] . COMSOL mesh module was used for grid generation.…”

Section: Solar Pondsmentioning

confidence: 99%

The investigation of using phase change material for solar pond insulation

Bozkurt

2022

THERM SCI

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Solar ponds are systems that store solar energy in salt water as heat energy. In order to store heat energy for a long time in solar pond, the heat insulation should be done well. In this study, the effect of phase change materials (PCMs) was investigated to improve the insulation of the pond and to store the heat energy for a longer time. The melting temperature is a key parameter in the selection of PCMs. The temperature distribution of the solar pond was examined and PCMs with melting temperatures in the range of the pond average temperature ? 10?C were selected.Three different phase change materials were used in the walls of the solar pond for insulation. The temperature and enthalpy changes of the system were calculated numerically for a year. The heat storage ratio of the solar pond was determined by using the obtained enthalpy and solar radiation data. Consequently, the heat storage ratio of the pond with glass-wool is maximum 20.95% in July and minimum 7.92% in January. The heat storage ratio of the solar pond which Paraffin C18, Capric acid and Paraffin 44 are used as PCMs is maximum 32.22%, 34.85% and 47.81% in December, respectively. It is observed that the appropriate selection of PCMs is provided a longer storage time for solar ponds.

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Seasonal temperature variation of solar pond under Mediterranean condition

Cited by 6 publications

References 21 publications

A new perspective to the conventional solar pond technology to increase the thermal efficiency

A new perspective to the conventional solar pond technology to increase the thermal efficiency

Effect of hairy surface on heat production and thermal insulation on the building

The investigation of using phase change material for solar pond insulation

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