Experimental Study And Simulation Of Airflow In Solar Chimneys

Saifi, Nadia; Settou, Noureddine; Dokkar, Boubekeur; Negrou, Belkhir; Chennouf, Nasreddine

doi:10.1016/j.egypro.2012.05.146

Cited by 47 publications

(17 citation statements)

References 4 publications

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“…Chen et al [21] show that a maximum air flow rate was achieved at an inclination angle around 45° for a 200 mm gap and 1.5 m high chimney, and the air flow rate is about 45 % higher than that for a vertical chimney. Saifi et al [22] confirm that the optimal thermal pulling is reached at chimney inclination angle of 45°.…”

Section: Introductionmentioning

confidence: 92%

Experimental Analysis of Height to Base Length Effect in Trapezoidal Prism Inclined Solar Chimney

Belhadj

Benzenine²,

Saïm

2020

Period. Polytech. Mech. Eng.

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The use of a solar chimney for ventilation has a very significant environmental and economic impact. The aim of this work is to found the optimum ratio between height and base length in trapezoidal prism-shaped solar chimney. The idea is to give more flexibility to the architectural design in buildings and offer the possibility of combination with other passive or active systems. Trapezoidal shape of solar chimney can be interesting not by increasing the efficiency comparing with other shapes like the rectangular. It may be more aesthetically pleasing, easily to be installed and retrofitted on trapezoidal roofs even on existing buildings. For this reason, three differents ratios of height to base length (h/l = 1), (h/l = 1.5) and (h/l = 2) have been experimentally studied. Two correlations to predict solar chimney exit air velocity and efficiency were developed and tested; good agreement with experimental results is proved. Results show that the flow rate increase by increasing (h/l) in a logarithmic tendency. The optimum thermal efficiency is given where h/l = 1.65. An approach using RETScreen4 software was also carried out and showed that 1 m² solar chimney installed in favorable conditions can cover 37 m² of living space in term of ventilation. For a 120 m² house, solar chimney system saves the equivalent of 23.9 liters of gasoline per year.

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Section: Introductionmentioning

confidence: 92%

Experimental Analysis of Height to Base Length Effect in Trapezoidal Prism Inclined Solar Chimney

Belhadj

Benzenine²,

Saïm

2020

Period. Polytech. Mech. Eng.

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“…Through hypothetical investigation, the researchers have shown that the combined system can altogether enhance the solar energy utilization efficiency and the land resources utilization efficiency, in the meantime [62]. Inclined solar chimneys and effect of the inclination angle were investigated several researchers ( [63], [64], [65]. The researchers demonstrate that external winds improve the kinetic power of the emerging air [66].…”

Section: Theoretical and Numerical Investigationsmentioning

confidence: 99%

Past to Present: Solar Chimney Power Technologies

Tan

Shojaei

2019

El-Cezeri Fen Ve Mühendislik Dergisi

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This study introduces the solar chimney power technology, which is a solar thermal energy system. One of the renewable energy resources, this system is an energy transformation system in which solar energy and wind energy are used together. In this system, the air that is heated with solar energy ensures the production of electric energy by moving upwards with the suction effect of the chimney and rotating the turbine that is placed inside the chimney. In this review, the main principles and characteristics of this system are discussed and the developments on the experimental and theoretical investigations carried out with regard to the solar chimneys around the world especially in recent years are shared with the readers. With the study, it is aimed to provide upto-date information to readers who are interested in this subject.

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“…Effective ventilation and thermal comfort are of great significance in rural areas and in hot climate. One of the natural ventilation techniques that are used for conditioning buildings and which can participate to progress the energy efficiency of facilities are solar chimneys (Saifi, Settou, Dokkar, Negrou & Chennouf, 2012). Solar chimney has been frequently adopted in buildings to save energy by enhancing the natural ventilation (Shi et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Testing the performance of a solar energy cooling system in Baghdad city

Ahmed

AL-Salihi

Hussain

2021

srees

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Renewable energy resources have become a promissory alternative to overcome the problems related to atmospheric pollution and limited sources of fossil fuel energy. The technologies in the field of renewable energy are used also to improve the ventilation and cooling in buildings by using the solar chimney and heat exchanger. This study addresses the design, construction and testing of a cooling system by using the above two techniques. The aim was to study the effects of weather conditions on the efficiency of this system which was installed in Baghdad for April and May 2020. The common weather in these months is hot in Baghdad. The test room of the design which has a size of 1 m3 was situated to face the geographical south. The test room is thermally insulated and connected to a solar chimney which generates a convection current to draw the air out of the room through a heat exchanger. The heat exchanger was submerged in a water tank of 2 m length, 1 m width and 1 m height. It was also covered with a layer of soil mixture with a thickness of 10 cm. The experiment simulates the natural conditions of a shallow water surface, connected to the room from the other side. The study results revealed that the air temperature inside the test room was lower than that of the ambient air outside. Pearson correlation coefficient showed that there was a strong direct relationship between solar radiation, temperature and wind speed from one side and the cooling efficiency from the other side. Also, there was a negative correlation between relative humidity and cooling efficiency.

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Experimental Study And Simulation Of Airflow In Solar Chimneys

Cited by 47 publications

References 4 publications

Experimental Analysis of Height to Base Length Effect in Trapezoidal Prism Inclined Solar Chimney

Experimental Analysis of Height to Base Length Effect in Trapezoidal Prism Inclined Solar Chimney

Past to Present: Solar Chimney Power Technologies

Testing the performance of a solar energy cooling system in Baghdad city

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