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Maia, Cristiana Brasil, and Janaína de Oliveira Castro Silva. "CFD Analysis of a Small-Scale Solar Chimney Exposed to Ambient Crosswind." Sustainability 14, no. 22 (November 16, 2022): 15208. http://dx.doi.org/10.3390/su142215208.
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Solar chimneys are devices that use solar energy to generate a hot airflow that can be used for power production, the drying of agricultural products, and/or water desalination. The performance of a small-scale solar chimney is studied numerically. The computational domain includes the solar chimney, the ground, and the atmosphere. The turbulent airflow is simulated using the commercial CFD code Ansys Fluent. The only boundary conditions required for the simulation are the wind speed, the ambient temperature, and the absorbed energy from the ground, determined by an energy balance in the system. The system was simulated for one day in the summer in the city of Belo Horizonte, Brazil. The ambient crosswind plays an important role in the velocity and temperature. The velocity inside the solar chimney increased with the wind speed, increasing the heat transfer and decreasing the airflow temperature. When the wind speed increased from 0 to 10 m/s, the outlet velocity increased from 1 to 4 m/s, and the outlet temperature decreased from 313 to 304 K.
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Firfiris, Vasileios K., Zoi D. Kaffe, Sotirios D. Kalamaras, Antonios A. Lithourgidis, Anastasia G. Martzopoulou, and Thomas A. Kotsopoulos. "A Prototype Passive Solar Drying System: Exploitation of the Solar Chimney Effect for the Drying of Potato and Banana." Applied Sciences 12, no. 22 (November 19, 2022): 11784. http://dx.doi.org/10.3390/app122211784.
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Agricultural product drying is of great importance as it is a reliable method for fruit and vegetable preservation. Tackling the high energy consumption of the process will reduce the final product cost and mitigate greenhouse gas emissions. In this work, a passive drying method was experimentally evaluated. The method was based on the principle of the stack effect taking place in the solar chimney structure. Different types of solar chimneys in terms of dimensions and materials were evaluated for the drying of banana and potato slices. The results of the experiments showed that the drying rate was close to solar drying systems. Parameters such as height and material characteristics of drying tubes, as also weather conditions, influenced the drying rate. It was found that the banana and potato slices were dried at a satisfactory rate for almost 48 h during the summer period in Greece. From the parameters of the drying tubes that were varied, it was found that both the height and material played a major role, as did the air flow rate. With the increase in the drying tube by 1 m and with the choice of proper manufacturing material, an increase in the flow rate between 40% and 100% can be achieved. When only the color of two 3 m-high tubes changed, the flow rate varied between 4% and 15%. The proposed method has almost zero energy consumption, and it could be used as a standalone or as a part of a hybrid drying system. It can also be adjusted in existing greenhouse-type agricultural structures as a parallel operation system.
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Murti, Made Ricki, and Chan Woo Park. "Transient Thermal Efficiency of Natural Hybrid Dryer System on Chimney Height Variation of Exhaust Moist Air." Applied Mechanics and Materials 776 (July 2015): 461–69. http://dx.doi.org/10.4028/www.scientific.net/amm.776.461.
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In developing countries, the sun and biomass are very important as the alternative and renewable energy sources that is very necessary the effort for utilizing them maximally. This study has developed a natural hybrid dryer system utilizing the heat energy was generated from the biomass stove and the solar collector. This dryer system has been tested on the chimney height variation of exhaust moist air, namely: 2m, 4m, and 6m. For assessment of thermal efficiency, several variables of experimental data was collected consist of: several point of air flow temperatures, the ambient temperature, air flow velocities, mass of material which was dried, and solar radiation. Further, the efficiency of solar collector, the efficiency of biomass stove, the efficiency of drying chamber, and the total efficiency of system against the time as the purpose of this study. The result showed that with increased of chimney height of exhaust moist air caused the increase of air mass flow rate, and further caused the increase of heat transfer rate in the biomass stove and solar collector against the time. It caused the increased of transient thermal efficiency of biomass stove and solar collector against the time and it was influencing the increase of evaporation rate. Thus, the drying speed was increasing and with chimney height of 6m was the fastest with the drying time was 7 hours, while 7.5 hours and 8 hours were for height of 4m and 2m respectively. With increased of chimney height of exhaust moist air caused the efficiency of the drying chamber was decreasing and the total efficiency of system was increasing slightly, each was decreasing against the time due to decreasing of mass.
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Gebremicheal, Gedion Habtay, Janos Buzas, and István Farkas. "Performance Evaluation of Solar Air Collector by Chimney Effect for Drying Applications." Acta Technologica Agriculturae 24, no. 4 (December 1, 2021): 159–65. http://dx.doi.org/10.2478/ata-2021-0027.
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Abstract Solar air collector is one of the main components of a solar dryer unit, which supplies the conditioned air for processing the perishable edible items. Various techniques have been employed to improve the thermal efficiency of the collector system, such as extended surfaces, packed beds, artificial roughness, etc., however, the cost of construction is higher. Therefore, this study was focussed on the collector efficiency enhancement using a chimney without applying the aforementioned. A single-pass solar air collector coupled with drying chamber and chimney was utilized for the experiments. The experiments were conducted in September. The average values of the solar radiation intensity, ambient temperature, temperatures inside the dryer, collector efficiency were graphically presented. The experimental data reported the maximum values of the outlet temperatures for the solar air collector with and without a chimney to be 52.8 °C and 57 °C, respectively. The collector thermal efficiency with and without the chimney was found to vary from 29.6% to 64.8% and from 26.9% to 44.8%, respectively. Furthermore, it was noticed that, with the chimney, the temperature inside the dryer showed uniform tendency.
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Sikarwar, Nitin, and Amit Agrawal. "Experimental Investigation and Performance Analysis of a Solar Dryer Using Advanced Heat Transfer Materials." International Journal for Research in Applied Science and Engineering Technology 11, no. 6 (June 30, 2023): 4754–65. http://dx.doi.org/10.22214/ijraset.2023.54530.
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Abstract: This thesis evaluates the performance of a mixed-mode solar dryer with a backup heater. This thesis compares the solar dryer alone with the solar dryer with backup heater in terms of drying rate, efficiency, and drying time. The primary collector, the secondary collector on the roof, three drying trays within a drying chamber, and the chimney make up the dryer. A single pass twin duct air heating system and an aluminium plate that has been coated black make up the primary collector. The drying chamber's top secondary collector and side walls are constructed of clear glass. The drying chamber is heated with a banana charcoal burner backup heater.
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Hussain Al-Kayiem, Tadahmun Ahmed Yassen, and Sundus Al-Azawiey. "Thermal Analysis of Tilapia Fish Drying by Hybrid Solar Thermal Drying System." Journal of Advanced Research in Fluid Mechanics and Thermal Sciences 90, no. 1 (December 25, 2021): 115–29. http://dx.doi.org/10.37934/arfmts.90.1.115129.
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The present work presents a hybrid solar thermal drying of Tilapia fish to improve the product quality and satisfy the importers. The developed hybrid dryer utilized direct solar drying, a solar air heater and a thermal backup unit which sustains the drying process during the night, cloudy and rainy weather conditions. Besides, a new feature of the developed dryer utilizes the flue gas exhausted from the thermal unit to enhance the updraft in the drying chamber by re-injection of the flue gases in the chimney. The initial moisture content of the Tilapia fish used in the investigation was 246.6% on a dry basis, equivalent to 74% on a wet basis. The investigations were repeated three times on different days. Experimental results showed that the moisture content was reduced to an average final of 17.0% db (5.0% wb) within 17.5 hours, while in the open sun drying, it required around 48-72 hours. Hybrid solar drying required around 72% shorter time than open sun drying. The average overall drying efficiency of the developed system for drying Tilapia fish was 13.0%. The Re-injection technique used in the present hybrid solar-thermal system has excluded the need for an electric source for air extraction from the drying chamber, which is highly desired in the rural and fishery regions.
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Irwansyah, Irwansyah, Leopold Oscar Nelwan, and Dyah Wulandani. "Desain dan Uji Kinerja Alat pengering Hybrid Dengan Efek Cerobong Tipe Tumpukan untuk Pengeringan Biji Kopi Arabika." Jurnal Keteknikan Pertanian 7, no. 3 (April 1, 2020): 163–70. http://dx.doi.org/10.19028/jtep.07.3.163-170.
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Artificial drying method for arabica coffee beans requires a large consumption of electrical energy. Electricity is needed to rotate the blower which functions to circulate hot air to the dryer so that it can evaporate some of the water contained in the coffee beans. Most of the arabica coffee producing areas in Aceh province have not been reached by the electricity network so the use of artificial dryers cannot be used. To overcome this obstacle, the air flow circulation system with chimney effect can be used to drain dry air. The aim of this research is to design a chimney effect hybrid dryer which is heat source from solar and biomass energy, to test the performance of the dryer and compare it with the sun drying method. Parameters observed were temperature, moisture content and specific energy consumption of solar radiation and biomass. Dryer capacity is 5 kg of arabica coffee beans. The results showed that the chimney effect hybrid dryer can be used to dry 5 kg of coffee beans. The drying show that drying temperature on the dryer chamber ranged between 37.3-60.9°C. To reduce the moisture content of coffee beans from 52.5 to 12.8% bb, it was take 16-17 hours, while the sun drying method takes up to 46 hours (6 days). The total specific energy consumption of hybrid dryer was 57.1 MJ/kg of water vapor, while the specific energy consumption of the drying method was 59.4 MJ/kg of water vapor.
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Alonge, A. F., and O. O. Oniya. "An Indirect Passive Solar Dryer for Drying." Advanced Materials Research 367 (October 2011): 517–24. http://dx.doi.org/10.4028/www.scientific.net/amr.367.517.
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A solar drying system designed on the principles of convective heat flow, constructed from local materials was employed in drying yam (Dioscorea Alata). A glass collector having an efficiency of about 0.63 was used along with an absorber for absorbing the heat energy. The drying chamber consisted of drying trays. A chimney fitted at the top centre of the drying chamber enhanced airflow. Air passing through the collector heated up and dried the foodstuff in the drying chamber. The latitude of Ilorin is 8.26oN and the collector angle could be varied . 56o C, 41o C and 71o C were obtained as the maximum attainable temperatures for the drying chamber, ambient and collector respectively. Two samples of yam chips, each weighing 1560g and having an average size of 1cm thick, were dried both inside the dryer and outside the dryer within its surrounding. The initial moisture content of the yam was 70.3% (wet basis) and its final moisture content was 9% (wet basis).The result was compared to natural sun drying. It was observed that the drying time was reduced from 52 hours for sun drying to 45 hours for solar drying. The total cost of the construction was 6, 105 Naira.
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KADE SURIADI, I. GUSTI AGUNG, and MADE RICKI MURTI. "KESETIMBANGAN ENERGI TERMAL DAN EFISIENSI TRANSIENT PENGERING ALIRAN ALAMI MEMANFAATKAN KOMBINASI DUA ENERGI." Jurnal Teknik Industri 12, no. 1 (March 30, 2012): 34. http://dx.doi.org/10.22219/jtiumm.vol12.no1.34-40.
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The energy used as a dryer is usually only a single type of energy. In this case, study is conducted on the natural flowdryer system by using the chimney. This combination of energy utilization of solar energy and biomass that can be used simultaneously or one turns in accordance with the needs or circumstances. It has been tested against a dryer prototype by performing measurements on the temperature of the inlet air and exit on biomass furnace, the temperature of the inlet air and exit on the solar collector, the temperature of inlet air and exit on the drying chamber, the water content of dried material, the temperature of dried material, the surface temperature of inside and outside of wall on drying chamber, and the intensity of solar radiation. Data were collected at an interval of 30 minutes and do the processing of such data. Next made in a graphical form of thermal energy balance and system efficiency versus the time. Results obtained that: the drying time was 7.5 hours. Thermal energy balance versus the time found that the increase of energy losses lead to useful energy reduction system.
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Chen, Wei, and Man Qu. "Analysis of the heat transfer and airflow in solar chimney drying system with porous absorber." Renewable Energy 63 (March 2014): 511–18. http://dx.doi.org/10.1016/j.renene.2013.10.006.
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Martiani, Erni, Murad, and Guyup Mahardhian Dwi Putra. "Modification and Test Performance of Rack Type Hybrid (Solar-Biomass) Dryer." Jurnal Ilmiah Rekayasa Pertanian dan Biosistem 5, no. 1 (July 30, 2017): 339–47. http://dx.doi.org/10.29303/jrpb.v5i1.45.
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This study aimed to modify biomass furnaces source of heat energy from the combustion of biomass, study thermal energy generated from combination of solar and biomass energy, and determine efficiency of furnaces and efficiency of total system of a rack type hybrid (solar-biomass) dryer. Method used in this research was experimental method. Used fuel was coconut shell charcoal and used tools include iron plate, blower, pipe, grinding and welding tools, thermometer, anemometer, lux meter, data logger and analytical balance. Observed parameters were temperature, air humidity, sun radiation, velocity and flow rate of hot air towards the drying chamber, drying period, energy loss and energy produced inside the furnace. Modification made by adding drawer shaped biomass furnace with 0.65 m length, 0.65 m wide and 0.25 m height. The furnace was equipped with a chimney and blower. Results from the test performance showed that this tool yield total heat loss of 18,173.15 KJ at the upright furnace wall. Whereas heat loss at furnace floor was 4380.899 KJ. Energy consumption was 151,602.064 for solar energy and 48,399.4 KJ for biomass energy, with total drying energy generated by solar energy and biomass i.e. 200,001 KJ. Efficiency value of the drying system was 19% with 30% furnace efficiency.
Keywords: Hybrid dryer, heat loss, biomass furnaces
ABSTRAK
Penelitian ini bertujuan untuk memodifikasi tungku biomassa sebagai tempat sumber energi panas dari pembakaran biomassa, mempelajari energi panas yang dihasilkan oleh kombinasi energi surya dan energi biomassa, dan mengetahui efisiensi tungku dan efisiensi total sistem pada alat pengering hybrid (surya-biomassa) tipe rak. Metode yang digunakan dalam penelitian ini yaitu metode eksperimental. Bahan bakar yang digunakan yaitu arang tempurung kelapa dan alat yang digunakan antara lain plat besi, blower, pipa, gerinda, las, thermometer, anemometer, lux meter, data logger, dan timbangan analitik. Parameter yang diamati terdiri dari suhu, kelembaban udara, radiasi matahari, kecepatan aliran udara panas menuju ruang pengering, debit aliran udara menuju ruang pengering, lama waktu pengeringan, kehilangan energi pada tungku dan energi yang dihasilkan. Modifikasi yang dilakukan adalah menambahkan tungku biomassa yang berbentuk seperti laci dengan ukuran panjang 0,65 m, lebar 0,65 m dan tinggi 0,25 m. Tungku ini dilengkapi dengan cerobong asap dan blower. Hasil pengujian alat ini diperoleh total kehilangan panas pada dinding tegak tungku 18.173,15 KJ, sedangkan kehilangan panas pada lantai tungku 4.380,899 KJ. Konsumsi penggunaan energi, yaitu energi surya 151.602,064 KJ dan energi biomassa 48.399,4 KJ dengan total energi pengeringan yang dihasilkan oleh energi surya dan biomassa sebesar 200.001 KJ. Nilai efisiensi sistem pengeringan yang dihasilkan yaitu 19% dengan efisiensi tungku 30%.
Kata kunci: alat pengering Hybrid, kehilangan panas, tungku biomassa
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Morris, L. O., C. M. Chu, and E. Suali. "Lipid yields of algae dried in an enhanced solar chimney." IOP Conference Series: Materials Science and Engineering 1195, no. 1 (October 1, 2021): 012002. http://dx.doi.org/10.1088/1757-899x/1195/1/012002.
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Abstract This work focuses on the lipid yield of algae dried using an enhanced solar chimney dryer with the aim towards high quality biodiesel production and low energy consumption. Jaworski’s medium was chosen for the cultivation in this research project as it can provide enough nutrients to green algae of type Chlorella. Sp. Centrifugation is an effective method to harvest the algae from its medium prior to a drying process. In this project, the methods used for drying were oven drying, open-sun drying and an enhanced solar chimney drying. The moisture content was determined where the average moisture content were 82.5% for oven drying method, 81.6% for open sun drying and 82.2% for solar chimney drying. Methods were found to affect differently the algae properties in terms of the lipid yield and mineral content. The lipid yields were 23.7%, for oven drying, 20.6% for open sun drying and 24.4% for enhanced solar chimney drying. While the oven drying was found to be the fastest way to dry the algae, the solar chimney drying proved best in energy saving while producing the same amount or more algae lipid within reasonable drying times.
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Habtay, Gebremicheal Gedion, Janos Buzas, and Istvan Farkas. "Comparative Study on the Performance of Solar Dryer with Finned Plate Solar Chimney." Jurnal Tekno Insentif 16, no. 1 (April 30, 2022): 1–15. http://dx.doi.org/10.36787/jti.v16i1.700.
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ABSTRACT
The objective of this study is to investigate the influence of geometrical parameters of a solar chimney, i.e., on the flow channel air gap, on the performance of a solar dryer in terms of thermal efficiency, drying efficiency, and dried product weight loss. Experimental outcomes showed the temperature inside the drying chamber increases as solar intensity increases, while relative humidity decreases. In the study sliced potatoes were selected to be dried. The average collector and chimney efficiency were found to be higher when a 10 cm air gap height was used instead of a 5 cm air gap height. After 8.5 h of drying, the moisture content of the 5 cm and 10 cm chimney air gap height differed by around 28%. Moreover, the temperature of the chimney absorber was found to be between 35.5-81 °C, with an average of 56.6 °C, which is roughly 13% lower than the collector absorber due to the solar chimney’s orientation.
ABSTRAK
Tujuan dari penelitian ini adalah untuk mengetahui pengaruh parameter geometri cerobong surya, khususnya ketinggian celah udara saluran aliran, terhadap kinerja pengering surya dalam hal ini efisiensi termal, efisiensi pengeringan, dan kehilangan berat produk kering. Hasil pengujian memperlihatkan bahwa temperatur di dalam ruang pengering meningkat seiring dengan meningkatnya intensitas matahari, sementara kelembaban relatif menurun. Dalam penelitian ini, irisan kentang dipilih sebagai objek pengering. Efisiensi kolektor dan cerobong rata-rata lebih tinggi pada kondisi celah udara 10 cm dibandingkan celah udara 5 cm. Setelah 8,5 jam proses pengeringan, kadar air pada kondisi celah udara cerobong 5 cm dan 10 cm berbeda sekitar 28%. Temperatur penyerap cerobong berada diantara 35,5-81 °C, dengan rata-rata 56,6 °C, yang berarti temperaturnya lebih rendah 13% dibandingkan dengan temperatur penyerap kolektor, sebagai akibat adanya orientasi cerobong surya.
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Mukanema, Maona, and Isaac N. Simate. "CFD Simulation of Temperature and Air Flow in a Natural Convection Solar Tunnel Dryer with a Bare Flat-Plate Chimney." Energy and Environment Research 13, no. 1 (February 27, 2023): 1. http://dx.doi.org/10.5539/eer.v13n1p1.
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Computational Fluid Dynamics simulation of a natural convection solar tunnel dryer with a bare flat-plate chimney is presented. The chimney’s function is to create airflow in the dryer through the buoyancy effect by re-heating the air coming from the drying unit and is therefore a major factor in the drying rate. CFD simulation was therefore employed to study the temperature and airflow in the dryer and determine the areas that could be improved upon. The design of the solar tunnel dryer geometry used in this simulation was done in SOLIDWORKS 2016 whereas the simulation of temperature distribution of airflow inside the dryer was performed using SOLIDWORKS 2016 flow simulation program in a steady-state regime. The boundary conditions were set using the obtained experimental data. The simulation results showed that the chimney losses heat, that there is air recirculation in the collector, that the airflow experiences some pressure loss as it moves from the drying chamber to the chimney, and that there is some reduction of the velocity in some parts of the dryer. The simulated and experimental collector efficiencies were found to be 33.09 and 37.63%, respectively, giving a mean relative deviation of collector temperature of 5.1%. To improve the performance of the dryer, insulating and glazing of the chimney is suggested as well as using a curved joint between the chimney and the drying chamber.
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AL. Galia, Rabia, Bashir Arebi, and Essaied Shuia. "Investigation of Solar Chimney System and the Effct of Thrmal Storage Capacity on the System Performance Part I: Experimental Investigation." Solar Energy and Sustainable Development Journal 6, no. 2 (December 31, 2017): 55–70. http://dx.doi.org/10.51646/jsesd.v6i2.48.
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The performance and the thermal behavior of the solar chimney were investigated experimentally. The experimental data were collected from small pilot solar chimney which was designed and constructed at Sabratha Faculty of Engineering-Libya. Solar chimneys need solar radiation in order to work, thus, to have more stable condition, solar energy should be stored during the day and released back during the night. In order to investigate the temperature fild during daylight and hours of darkness, the data were collected for a period of 24 hours for several days of months, May and June 2014. Th investigation also include the effctof thermal storage on the temperature fild. Th solar chimney system contains two main components; the solar collector and the solar chimney. Th solar collector roof has a circular area of 126 m2. A PVC pipe 0.2 m in diameter and 9 m in height was used as a chimney. Water containers were put as thermal blocks to study the effct of thermal storage on the performance of solar chimney. The measurements included the intensity of solar radiation inside/outside the collector, temperature and velocity of heated air at the entrance of the chimney, temperature and speed of wind outside the collector, temperature of the ground inside the collector and temperature measurements of air at particular points at diffrent levels throughout the collector. Solar irradiance was found to affct the chimney temperature and subsequently chimney air velocity. The temperature diffrence between the hot air at chimney entrance and the ambient reached about 45 °C, which generates the driving force of airflw in the chimney. Th hot air velocity in the chimney can reach 3.6 m/s (≈ 0.118 kg/sec). Wind speed was found to have a small inflence on the performance of the solar chimney.The results indicate that the solar chimney system can operate in northwestern Libya. If this type of system is used on a large scale it can trap solar radiation and store a suffient amount of heat through the use of additional heat storage such as water, which raises the air temperature in the collector aftr sunset to a suffient value capable of generating air flw for a long time to run turbines to produce electricity during the day and aftr sunset especially during the summer time.
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Zhang, Xing Qiang, Xing Fei Yuan, and Li Min Li. "Structural System and Conceptual Model Test of Solar Chimney." Advanced Materials Research 168-170 (December 2010): 1601–10. http://dx.doi.org/10.4028/www.scientific.net/amr.168-170.1601.
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The solar chimney power station is a renewable energy system consisting of solar collector, wind turbine, and chimney. To improve the efficiency of energy generation, the higher chimney is the better. Considering the difference between the solar chimney and the traditional high-rise structure, the study on the chimney from the structural point of view is produced in this paper. The existing and planed chimneys are first introduced. Then the solar chimney is classified according to material, structural system, and constraint condition. Followed that, application of prestress technology including adoption of prestressed concrete, introduction of circumferential prestress, arrangement of stayed cable or cable net, and utilization of tensegrity system in the solar chimney is involved, which can improve the structural behavior of the chimney significantly. On this basis, conceptual models of three different structural systems are designed, and the performance of the models is tested under the horizontal force to show the effect of stayed cable and spokewise cable.
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Gannon, Anthony J., and Theodor W. von Backstro¨m. "Solar Chimney Cycle Analysis With System Loss and Solar Collector Performance." Journal of Solar Energy Engineering 122, no. 3 (July 1, 2000): 133–37. http://dx.doi.org/10.1115/1.1314379.
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An ideal air standard cycle analysis of the solar chimney power plant gives the limiting performance, ideal efficiencies and relationships between main variables. The present paper includes chimney friction, system, turbine and exit kinetic energy losses in the analysis. A simple model of the solar collector is used to include the coupling of the mass flow and temperature rise in the solar collector. The method is used to predict the performance and operating range of a large-scale plant. The solar chimney model is verified by comparing the simulation of a small-scale plant with experimental data. [S0199-6231(00)00503-7]
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Keawsuntia, Yuttachai. "Experimental Investigation of Active Solar Dryer for Drying of Chili." Advanced Materials Research 953-954 (June 2014): 16–19. http://dx.doi.org/10.4028/www.scientific.net/amr.953-954.16.
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This research paper presents the experimental results of drying of chili by using the active solar dryer and sun drying because of chili is a commercial agricultural product of Thailand. The active solar dryer consisted of a solar collector, a drying chamber and a chimney. The small fans were installed in the solar collector of active solar dryer to provide the air flow circulated in the solar collector and a drying chamber. Drying of chili of 20 kg from moisture content 84 percent wet basis to 10 percent wet basis following the Thai Agricultural Standard (TAS 3001-2010) showed that the use of the active solar dryer to make the drying time reduced about 28.7 percent compared with sun drying because of the hot air temperature inside the drying chamber higher than the ambient temperature about 10 to 15 . The quality of dried chili from the active solar dryer better than dried chili from sun drying.
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Ferreira, André G., Cristiana B. Maia, Márcio F. B. Cortez, and Ramón M. Valle. "Technical feasibility assessment of a solar chimney for food drying." Solar Energy 82, no. 3 (March 2008): 198–205. http://dx.doi.org/10.1016/j.solener.2007.08.002.
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Yuwana, Yuwana, Bosman Sidebang, and Evanila Silvia. "“TEKO BERSAYAP” MODEL SOLAR DRYER FOR FISH DRYING." Jurnal Agroindustri 6, no. 2 (December 1, 2016): 51–56. http://dx.doi.org/10.31186/j.agroind.6.2.51-56.
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This objective of this research was to design a dryer called “Teko Bersayap” model and then to test its performance in drying fish in order to solve problems arising from open air sun drying. The dryer consisted of drying chamber with trays inside, heat collectors equipped with air inlets at their lower ends, chimney with an exhaust fan inside and humid air outlet at its upper end, was constructed to dry fish, “Bleberan (Pepetak Leiognatus spp)” species. The results of the experiment indicated that the dryer produced the drying chamber temperature 8.83oC higher than the ambient temperature and the relative humidity 13.91% lower than the ambient relative humidity. The fish moisture content decreased exponentially with drying time and the dryer completed the fish drying process in 18.9 hours compared to 27.6 hours of drying time needed to complete the sun drying for the fish, suggesting that the dryer was ready for utilization
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Jittabut, Pongsak. "A Mathematical Model for Determination of Electric Energy Performance of Small Solar Chimney System in Nakhon Ratchasima Province, Thailand." Applied Mechanics and Materials 804 (October 2015): 341–44. http://dx.doi.org/10.4028/www.scientific.net/amm.804.341.
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A solar chimney power plant is a simple solar thermal power plant that is capable of converting solar energy to thermal energy in the solar collectors. Then, the generated thermal energy is converted to kinetic energy in the chimney and ultimately to electric energy via a wind turbine and a generator. The purpose of this study is to evaluate the performance of the solar chimney power plant in Nakhon Ratchasima, Thailand in terms of estimateion for the electric energy output. A mathematical model based on the energy balance was developed to estimate the power output of solar chimneys as well as to examine the effect of various ambient conditions and structural dimensions on the power generation. It was found that, the wind speed inside chimney reaches more than 2 times of the value of free wind speed outside the chimney. The solar chimney power plant with 10 m chimney height and 4 m chimney diameter is capable of yearly producing between 1,779-3,647 W and the performance of solar chimney in the range of 9-18% respectively. The highest performance of solar chimney (18%) was appeared in April. It can save the use of conventional sources of energy like oil and natural gas.
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Lipnicki, Zygmunt, Marta Gortych, Anna Staszczuk, Tadeusz Kuczyński, and Piotr Grabas. "Analytical and Experimental Investigation of the Solar Chimney System." Energies 12, no. 11 (May 29, 2019): 2060. http://dx.doi.org/10.3390/en12112060.
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In this, paper the authors propose a new simplified method of solving the problem of air flow through a solar chimney system using a classical system of equations for the principles of conservation (momentum, mass, and energy), as well as a general solution to research the problem using similarity theory. The method presented in this paper allows one to design a solar chimney. The theoretical analysis was compared with experimental studies on existing solar towers. The experimental and theoretical studies were satisfactorily consistent. For clarity, the phenomenon of heat flow in the solar chimney was described using dimensionless numbers, such as the Reynolds, Grashof, Galileo, Biot, and Prandtl numbers. In the equations for the dimensionless geometric parameters, the ratios of the collector radius to the thickness gap, height, and chimney radius were used. The method used to test the system of equations allows us to analyse various solar collectors easily. In the scientific literature, there is a lack of a simple calculation method to use in engineering practice, suitable for each type of solar chimney independent of dimensions and construction parameters.
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Li, Qing Ling, Xi Yan Fan, Xuan Xin, Jun Chao, and Yan Zhou. "Performance Study of Solar Chimney Power Plant System with a Sloped Collector." Key Engineering Materials 561 (July 2013): 597–603. http://dx.doi.org/10.4028/www.scientific.net/kem.561.597.
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There is a solar chimney power plant system supported by southern sloped mountain for high latitudes. The sloped collector is built at suitable mountain hills, which also functions as a chimney. Then a short vertical chimney is added to install the vertical axis air turbine. Deduce and analysis the power and efficiency of the system. The result indicates that for northern latitude area near 35 degrees, the power and efficiency of the solar chimney power plant system with a appropriate sloped angle collector are higher than the solar chimney power plant system with a horizontal collector, besides, the system scale is bigger, the gap is more larger. Furthermore, the system can appropriately reduce the height of vertical chimney and construction problems.
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Simate, Isaac Nyambe, and Sam Cherotich. "Design and Testing of a Natural Convection Solar Tunnel Dryer for Mango." Journal of Solar Energy 2017 (October 16, 2017): 1–10. http://dx.doi.org/10.1155/2017/4525141.
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A natural convection solar tunnel dryer comprising three major units, a solar collector unit, a drying unit, and a vertical bare flat-plate chimney, was constructed. No-load tests with a horizontal configuration of air entry into the collector resulted in a bidirectional air flow in the dryer. To correct this undesirable situation, an air guide at the collector was incorporated to ensure that air entered in a vertical direction. To investigate its performance, drying experiments with mango were carried out at the University of Zambia, Department of Agricultural Engineering. Uncertainties in the parameters measured in the experiment were analysed and quantified. The results showed that, under solar radiation between 568.4 and 999.5 W/m2, air temperature of up to 65.8°C was attained at the collector unit. The average relative humidity values were 30.8%, 6.4%, and 8.4% for the ambient, collector, and drying unit, respectively. Under these conditions, mango with an initial moisture content of 85.5% (wet basis) was dried to 13.0% (wet basis) in 9.5 hours. The collector, drying, and pick-up efficiencies were found to be 24.7%, 12.8%, and 35.0%, respectively. The average temperature difference between the chimney air and ambient air was 12.1°C, and this was sufficient in driving the flow of air through the dryer.
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Nasri, Faouzi. "Numerical Simulation of a Efficient Solar-Powered Ventilation System." Engineering, Technology & Applied Science Research 13, no. 4 (August 9, 2023): 11459–65. http://dx.doi.org/10.48084/etasr.6038.
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The objective of this study is to conduct a numerical analysis of a small-scale solar ventilation-air conditioning system operating under the meteorological conditions of Bisha, Saudi Arabia. The primary objective of the proposed system is to provide sustainable and comfortable thermal conditions. To achieve this objective, the system recovers the heat wasted by the solar ventilation process and reuses it to power the desiccant dehumidification process. The solar chimney features a lateral (vertical) wall design, and a comparative performance investigation of two solar chimney designs (conventional vs original) is conducted. Mathematical models of the ventilated room and solar chimney are developed, and numerical simulations are carried out to evaluate the performance of each solar chimney design. The study aims to assess the ability of each design to maintain indoor thermal comfort through the analysis of air distribution temperature and air streamlines. The results of the performance comparison revealed that the proposed solar chimney design outperformed the conventional design in terms of thermal and ventilation performance. The proposed solar chimney design, with its lateral (vertical) wall, was also found to be more effective in maintaining indoor thermal comfort than the conventional design. The simulations showed that the proposed design produced a more uniform air distribution temperature within the ventilated room, resulting in improved comfort levels. Additionally, the proposed design was found to have a more efficient airflow pattern, with fewer areas of stagnant airflow. These results suggest that the proposed solar ventilation-air conditioning system has the potential to provide sustainable and comfortable thermal conditions in small-scale buildings.
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Shuia, Essaied, Bashir Arebi, and Ibrahim Abuashe. "Experimental and Theoretical Investigation of Performance of a Solar Chimney Model, Part I: Experimental Investigation." Solar Energy and Sustainable Development Journal 3, no. 1 (December 31, 2014): 51–62. http://dx.doi.org/10.51646/jsesd.v3i1.88.
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This paper presents the experimental data that was collected from a small pilot solar chimney. The experimental data together with ambient conditions are used to evaluate the performance and study the behavior of the solar chimney; this data will be used for comparison with theoretical models in another paper (part II). T e solar chimney prototype was designed and constructed at the Subrata Faculty of Engineering-Libya. The data were collected over several days of June 2011. T e solar chimney system contains twomain components; the solar collector and the solar chimney. T e solar collector roof has a circular area of 126 m2, the solar chimney is a PVC tube with an internal diameter of 0.2 m and the total height of the chimney is 9.8 m. T e measurements include the intensity of solar radiation inside/outside the collector, temperature and velocity of air at the entrance of the chimney, temperature and speed of wind outside the collector, temperature of the ground inside collector, and temperature measurements of air at specif c points at different levels throughout the collector. Solar irradiance was found to affect the chimney temperature and subsequently affect the chimney air velocity. T e experimental results showed that temperature differences of (30 – 45°C) were recorded between the ambient temperature and that of air inside the chimney in the middle of the day, where the highest air temperature of 73.4°Cwas recorded at the entrance of the solar chimney. The maximum air velocity of 3.6 m/s was recorded inside the solar chimney at noon on 9 June. Wind speed outside the collector had a small effect on the speed of the air inside the chimney and tends to change slightly, hence, can neglect influence of wind speed on the performance of the system. Also, the experimental results indicate that such type of system can trap a suffi cient amount of solar radiation, which elevates the air temperature to a sufficient value able to generate enough air f ow to operate a wind turbine to produce electricity; this means the solar chimney system for electricityproduction can work in the north-western part of Libya in the summer time at least.
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Umayal Sundari, AR, P. Neelamegam, and C. V. Subramanian. "An Experimental Study and Analysis on Solar Drying of Bitter Gourd Using an Evacuated Tube Air Collector in Thanjavur, Tamil Nadu, India." Conference Papers in Energy 2013 (May 23, 2013): 1–4. http://dx.doi.org/10.1155/2013/125628.
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The objective of this research work is to design and develop a forced convection solar dryer using evacuated tube air collector and study its performance on bitter gourd in Thanjavur District, Tamilnadu, India. The designed solar dryer consists of a drying chamber, evacuated tube air collector, a blower, and a chimney. Drying parameters, moisture ratio and drying rates, are calculated and their performance is compared with natural sun drying. The results of the present study show that the proposed solar dryer has greater efficiency, and the moisture content of bitter gourd is reduced from 91% to 6.25% in 6 hours as compared to 10 hours in natural sun drying. In this solar dryer, the products are uniformly dried, and the moisture content of the sample is controlled. It is found that the quality of the dried bitter gourd using solar dryer is higher than the natural sun-dried bitter gourd.
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Afriyie, J. K., O.-W. Achaw, K. A. Aikins, C. K. K. Sekyere, and A. Bart-Plange. "Field Drying of Cassava in a Solar Tent Dryer equipped with a Solar Chimney." International Journal of Science and Engineering Applications 5, no. 3 (May 8, 2016): 161–74. http://dx.doi.org/10.7753/ijsea0503.1007.
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Hamdad, Hichem, Salah Larbi, and Abdelkader Kessouri. "A Sensitivity Study of some Parameters on the Efficiency of a Passive Ventilation System Based on Solar Chimney." Applied Mechanics and Materials 393 (September 2013): 815–20. http://dx.doi.org/10.4028/www.scientific.net/amm.393.815.
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The purpose of this work is related to passive ventilation system analysis based on solar chimney. It consists in the determination of the temperature distributions of the wall, the glazing, and along the airflow in the chimney. The air mass flow rate and the instantaneous efficiency of the solar chimney were also determined. The energy performance of the solar chimney has been studied versus some geometrical and environmental parameters. The sensitivity study of the influence of some parameters on the efficiency of the system is also analysed. It is shown that the incident solar radiation has an important role on the energy performance of the solar chimney. Obtained results are compared to those of the literature. Good agreement is observed between the different results.
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Zhou, Xinping, Bo Xiao, Wanchao Liu, Xianjun Guo, Jiakuan Yang, and Jian Fan. "Comparison of classical solar chimney power system and combined solar chimney system for power generation and seawater desalination." Desalination 250, no. 1 (January 2010): 249–56. http://dx.doi.org/10.1016/j.desal.2009.03.007.
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Zhang, Haihua, Yao Tao, and Long Shi. "Solar Chimney Applications in Buildings." Encyclopedia 1, no. 2 (May 27, 2021): 409–22. http://dx.doi.org/10.3390/encyclopedia1020034.
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A solar chimney is a renewable energy system used to enhance the natural ventilation in a building based on solar and wind energy. It is one of the most representative solar-assisted passive ventilation systems attached to the building envelope. It performs exceptionally in enhancing natural ventilation and improving thermal comfort under certain climate conditions. The ventilation enhancement of solar chimneys has been widely studied numerically and experimentally. The assessment of solar chimney systems based on buoyancy ventilation relies heavily on the natural environment, experimental environment, and performance prediction methods, bringing great difficulties to quantitative analysis and parameterization research. With the increase in volume and complexity of modern building structures, current studies of solar chimneys have not yet obtained a unified design strategy and corresponding guidance. Meanwhile, combining a solar chimney with other passive ventilation systems has attracted much attention. The solar chimney-based integrated passive-assisted ventilation systems prolong the service life of an independent system and strengthen the ventilation ability for indoor cooling and heating. However, the progress is still slow regarding expanded applications and related research of solar chimneys in large volume and multi-layer buildings, and contradictory conclusions appear due to the inherent complexity of the system.
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Guo, Hong Jing, Jian Lan Li, and Shu Hong Huang. "Heat Storage Performance Analysis of Solar Chimney Power Plant System." Applied Mechanics and Materials 472 (January 2014): 276–85. http://dx.doi.org/10.4028/www.scientific.net/amm.472.276.
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Solar chimney power plant which can realize continuous power generation is a potential power generation technology. Based on the heat transfer theory and hydrodynamics theory, a comprehensive heat transfer and flow model of solar chimney power plant was proposed, and the characteristics of unsteady temperature field and flow field of the system were analyzed. With Manzanares solar chimney power plant as the geometric prototype, the performance of plant generation output and generation stability were studied in condition of different thickness of heat storage layer, different specific heat capacity and thermal conductivity of heat storage medium. The numerical stimulation results showed that above three factors significantly affected the power generation output and generation stability. Thus, the optimization of the three factors was achieved in this paper, which provides the basis for the solar chimney heat storage system design.
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Li, Gang, Hui Lan Huang, Hua Zhang, Jian Bin Liu, and Xiang Chen. "A Compressible Transient Model of the Solar Chimney and Heat Collector." Applied Mechanics and Materials 283 (January 2013): 15–21. http://dx.doi.org/10.4028/www.scientific.net/amm.283.15.
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The compressible transient model of solar chimney power plant system was proposed. It was added to the pressure equation and the ideal gas state equation basis on the heat balance equation for the solar collector model. The air flow station can be easily calculated with the improved model. The results of dynamic changes of the total pressure difference calculated in the model were in good agreement with the given actual measured values in references. The solar chimney model was considered the influence of fluid pressure on the density. The influence of the structural chimney on the chimney efficiency was analyzed with the established model. It was shown that the chimney efficiency changes significantly with the chimney height and its diameter. The chimney efficiency was decreased with a convergent chimney shape while increased with the divergent one. When the tilt angle of chimney reached a peak and then further increased, the chimney efficiency was the constant. These results will provide the important reference to improving the system efficiency.
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Huang, Hui Lan, Xiang Chen, and Gang Li. "A Solar Thermal Power System with Gas-Liquid Injector and Hydroturbine." Advanced Materials Research 347-353 (October 2011): 112–15. http://dx.doi.org/10.4028/www.scientific.net/amr.347-353.112.
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The characteristic of solar chimney power plant system is analyzed. For the key issue of low efficiency in solar chimney power plant system, a solar thermal power system with gas-liquid injector and hydroturbine is presented. This new system obtain the energy transferred process by gas-liquid injector. It is solar energy transformed into thermodynamic energy into potential energy and then into electricity. The density difference of work fluid is increased by gas-liquid phase transition in running process.The efficiency of solar thermal power generation is increased. In the case of the same cost, the theory power efficiency of new system increases one order of magnitude compared with the solar chimney power plant system. It proposes a new solution for large-scale application of solar thermal power technology.
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Hammadi, Salman. "Combined Solar Chimney Power Plant and Solar Still." Basrah journal for engineering science 16, no. 2 (June 1, 2016): 100–107. http://dx.doi.org/10.33971/bjes.16.2.10.
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This study presents solar chimney power plantintegrated with seawater desalination system. A simplemathematical model is based on the conservation of massand energy. The results show that the integrated system ofsolar chimney power plant and solar still can achievesimultaneously. The analysis is performed for bothsummer and winter at latitude 30oN. It’s noted that thewater layer thickness is of a significant effect on the freshwater productivity while the dimensions of solar chimneyand the solar collector are of a minor effect. Theproductivity of fresh water and output power for summerare the highest. The present work is compared withexperimental data of the other work and showed a goodagreement.
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Abuashe, Ibrahim A., Bashir H. Arebi, and Essaied M. Shuia. "Experimental and Theoretical Investigation of Performance of a Solar Chimney Model Part II: Model Development and Validation." Solar Energy and Sustainable Development Journal 5, no. 2 (December 31, 2016): 10–23. http://dx.doi.org/10.51646/jsesd.v5i2.60.
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A mathematical model based on the momentum, continuity, and energy balance equations was developed to simulate the behavior of the airflow inside the solar chimney system. The model can estimate the power output and performance of solar chimney systems. The developed mathematical model is validated by the experimental data that were collected from a small pilot solar chimney; (the experiment was presented in part I(. Good agreement was obtained between the experimental results and that from the mathematical model. The model can be used to analyze the solar chimney systems and to determine the effect of geometricalparameters such as chimney height and collector diameter on the power output and the efficiency of the system.
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Husain, Arkan khilkhal, Waheeds Shate Mohammad, and Abbas Jassim Jubear. "Numerical Simulation of The Influence of Geometric Parameter on The Flow Behavior in a Solar Chimney Power Plant System." Journal of Engineering 20, no. 08 (July 9, 2023): 88–108. http://dx.doi.org/10.31026/j.eng.2014.08.06.
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Numerical simulations have been carried out on the solar chimney power plant systems. This paper gives the flow field analysis for a solar chimney power generation project located in Baghdad. The continuity, Naver-stockes, energy and radiation transfer equations have been solved and carried out by Fluent software. The governing equations are solved for incompressible, 3-D, steady state, turbulent is approximated by a standard k - model with Boussiuesq approximation to study and evaluate the performance of solar chimney power plant in Baghdad city of Iraq. The different geometric parameters of project are assumed such as collector diameter and chimney height at different working conditions of solar radiation intensity (300,450,600,750 and 900 W/m2) to gain the optimal designed structure. The results show that the change of collector diameter and chimney height has considerable effects on the performance of the system. The velocity increase when the collector diameter and chimney height increase and reach to the maximize value at H=D 12 m and when solar intensity (900 W/m2). The study shows that Iraqi weather are suitable for this system.
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Syafrun, Muhammad. "Analisis Perubahan Waktu Pengeringan Terhadap Variasi Tinggi Cerobong." Jurnal Penelitian Enjiniring 22, no. 1 (May 19, 2019): 1–8. http://dx.doi.org/10.25042/jpe.052018.01.
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This study aims to find out the efficiency of grain dryers using a chimney and a fan as suction air from the collector into the drying chamber.The research was conducted at the Central of Laboratory Department of Mechanical Engineering Faculty of Engineering, University of Muslim Indonesia, Makassar. A dryer was made from a zinc plate of 0.2 mm as collector by using a hot-air and solar energy as a drying medium. It was expected that this tool can dry grain quickly with evenly distributed drying level or water content. There were five variations of the Chimney : 20 cm, 50 cm, 80 cm, 110 cm and 140 cm with the grain thickness of 7 cm, 5 cm and 3 cm. The data were then analyzed to obtained the efficiency of the dryer. The results reveal that the time required to lower the water content of the harvest grain from 24.6% to 13.6% - 13.85% of milled moisture was 4 hours - 6.5 hours with an efficiency of 34,232 % for grain thicknes 7 cm, 31,480 % for grain thicknes 5 cm and 30,122 for grain thicknes 3 cm at 80 cm chimney height.
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Aurybi, Mohammed A., Hussain H. Al-Kayiem, Syed I. U. Gilani, and Ali A. Ismaeel. "CFD Analysis of Hybrid Solar Chimney Power Plant." MATEC Web of Conferences 225 (2018): 04011. http://dx.doi.org/10.1051/matecconf/201822504011.
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In this study, a novel approach has been proposed as a solar chimney integrated with an external heat source to extend the system operation during the absence of solar energy. Flue gas channels have been utilized to exchange heat with the air inside the collector of the solar chimney. The hybrid solar chimney has been investigated numerically by ANSYS-Fluent software, using discrete ordinates radiation model. The hybrid system was simulated in 3D, steady-state by solving Navier-Stokes and energy equations. The numerical results have been validated using experimental measurements of a conventional solar chimney. The influence of flue channels on the system performance was predicted and analyzed in hybrid mode. With 0.002 kg/s of flue gas at 100°C injected in flue channels during the daytime; hybrid mode results demonstrated enhancement of 24% and 9 % for velocity and temperature, respectively. The power generation was enhanced by 56%. It has been proved that the proposed technique is able to resolve the set back of night operation problem of the solar chimney plants.
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Mdlalose, Siphiwe, Sipho Sibanda, Tilahun Workneh, and Mark Laing. "Innovative Low-Cost Naturally Ventilated Maize Seed Storage System." Journal of Agriculture and Crops, no. 81 (December 27, 2021): 39–49. http://dx.doi.org/10.32861/jac.81.39.49.
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A 22-m3 residential room was converted to a seed storage facility by retrofitting a solar collector on the roof. Three different chimney sizes of diameter and height of 200 mm x 3.6 m, 200 mm x 4.8 m, 300 mm x 3.6 m, and 300 mm x 4.8 m were investigated to determine the best size of the chimney to be used for ventilation in a storage facility. The parameters measured were the air velocity in the chimney duct, as well as the air temperature and relative humidity at the inlet, centre, and outlet of the storage facility. The diameter of the chimney had a significant effect (P<0.05) on the ventilation rate achieved in the storage facility. Significant differences were found between the different chimney diameters and heights (P≤0.05). The 300 mm diameter chimneys were able to extract hot air from the roof solar collector; however, the 200 mm diameter failed. The modified naturally-ventilated seed storage room was able to reduce the relative humidity from 69.7% to a safe relative humidity of 37.9%, while at the same time the temperature increased from 23.3℃ to 35℃ in the 300 mm x 4.8 m chimney.
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Kalkan, Naci, and İhsan Dağtekin. "Passive cooling technology by using solar chimney for mild or warm climates." Thermal Science 20, no. 6 (2016): 2125–36. http://dx.doi.org/10.2298/tsci150608168k.
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This study describes the design and analysis of solar system for mild or warm climatic conditions. In order to improve the performance of solar chimney system, well known software FLUENT is used to demonstrate the structures of these systems and finally compare the results with several examples, which have been studied previously. In order to improve the performance of solar chimney system, highly efficient sub-system components are considered for the design. The general purpose of the research is to understand how efficiently solar chimney systems generate cooling, and is to improve the efficiency of such systems for integration with existing and future domestic buildings.
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Al-Dabbas, Awwad. "A performance analysis of solar chimney thermal power systems." Thermal Science 15, no. 3 (2011): 619–42. http://dx.doi.org/10.2298/tsci101110017a.
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The objective of this study was to evaluate the solar chimney performance theoretically (techno-economic). A mathematical model was developed to estimate the following parameter: Power output, Pressure drop across the turbine, the max chimney height, Airflow temperature, and the overall efficiency of solar chimney. The mathematical model was validated with experimental data from the prototype in Manzanares power. It can be concluded that the differential pressure of collector-chimney transition section in the system, is increase with the increase of solar radiation intensity. The specific system costs are between 2000 Eur/kW and 5000 Eur/kW depending on the system size, system concept and storage size. Hence, a 50 MWe solar thermal power plant will cost 100-250 Eur million. At very good sites, today?s solar thermal power plants can generate electricity in the range of 0.15 Eur/kWh, and series production could soon bring down these costs below 0.10 Eur /kWh.
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Cai, Yang, Xiaoyan Huang, Binghua Hong, Jianwei He, and Fuyun Zhao. "Impact of non-uniform heat flux on ventilation performance of solar chimney." E3S Web of Conferences 356 (2022): 03051. http://dx.doi.org/10.1051/e3sconf/202235603051.
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Solar chimney (SC) is an effectively practical way to enhance building natural ventilation through thermal buoyancy force, which is induced due to the temperature difference between indoor and outdoor air temperatures. The ventilation performance of solar chimney directly depends on the heat flux distributions and values in the absorbed plate. Recently, many researches have been done on the thermal performance of solar chimneys under uniform heat flux. However, the uniform heat flow distribution cannot reflect the uneven characteristics of the solar radiation. There are few studies focused on the flow characteristic and thermal performance of solar chimneys under non-uniform heat flux distributions. In this paper, a two-dimensional numerical model of solar chimney integrated building is firstly established to explore the natural ventilation performance under non-uniform heat flux distributions. The numerical simulation is conducted to predict the flow and heat transfer characteristics in the room as well as in solar chimney. Subsequently, the effects of the location of the vent are analyzed to evaluate the performance of the solar chimney system. Finally, a comparison between the ventilation performance of solar chimney under the uniform heat flux and the non-uniform heat flux distributions is presented, and the thermal and flow structures of the solar chimney integrated building are further illustrated simultaneously. Research results show that the ventilation performance of solar chimney is closely related to its heat flux distribution, and the inhomogeneity of the heat flux of solar chimney will decrease the ventilation performance of the building. In addition, the position of the vent have highly influence on the flow structure and thermal performance for the solar chimney as well as the building. This paper will provide theoretical basis and technical approach for the improvement of the performance of the solar chimney, especially for the nonuniform heat flux distribution.
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Bachrun, Abraham Seno, Christy Vidiyanti, Lokman Hakim Ismail, and Izudinshah Abd. Wahab. "HOUSE'S SOLAR CHIMNEY A NUMERICAL ANALYSIS ON THE THERMAL PERFORMANCE IN JAKARTA." SINERGI 24, no. 3 (July 11, 2020): 245. http://dx.doi.org/10.22441/sinergi.2020.3.010.
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The abundance of solar light in tropical countries is the advantage of the utilization of solar energy. Increasingly expensive electricity forces buildings to use passive ventilation as building coolers. One of them is the use of the stack effect through the solar chimney. The absence of residential buildings that use the solar chimney as part of a passive ventilation system makes the need for prototypes for residential buildings. The application of solar chimney to homes in Jakarta is something new. Six types of the solar chimney have been tested on a prototype, one-story residential houses in Jakarta. The location was assumed to be in the densely populated area of South Jakarta. Wind velocity ambient data using Rubber locations. Using Ansys 16.0, simulations have been carried out, and solar chimney with double-full roof collector was able to induce a wind velocity of 0.41 m/s on average
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KASHIIDE, Ryo, Masayuki NAKAYAMA, and Atsushi AKISAWA. "Performance evaluation of solar heat driven ventilation system using solar chimney." Proceedings of the Symposium on Environmental Engineering 2016.26 (2016): 429. http://dx.doi.org/10.1299/jsmeenv.2016.26.429.
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Ghaffari, Ali, and Ramin Mehdipour. "Modeling and Improving the Performance of Cabinet Solar Dryer Using Computational Fluid Dynamics." International Journal of Food Engineering 11, no. 2 (April 1, 2015): 157–72. http://dx.doi.org/10.1515/ijfe-2014-0266.
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Abstract In this study, a new approach for numerically modeling of an entire cabinet solar dryer is proposed. Collector, drying chamber and chimney are the three principle sections considered in the present modeling. The collector section containing a cover and an absorber plate is modeled applying energy and fluid flow equations to obtain temperature distribution inside the collector. Due to the non-linear behavior of the governing equations as well as variety of effective variables, an iterative method is employed for solution. Regarding the geometry complexity of the drying chamber along with the air compressibility (that in turn causes coupling of momentum and energy equations) drying chamber is simulated by CFD method. Chimney’s effect and effective parameters in suction are comprehensively considered in the present model. The numerical results are in line with experimental results which show that the model can be applied with certainty to employ the dryer for drying highly demanded and time-consuming products in a scientific, sanitary, and timely manner. The model is then optimized by adding some baffles to achieve higher efficiencies and accelerate the drying process.
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Ayadi, Ahmed, Zied Driss, Abdallah Bouabidi, and Mohamed Salah Abid. "Effect of the number of turbine blades on the air flow within a solar chimney power plant." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 232, no. 4 (September 27, 2017): 425–36. http://dx.doi.org/10.1177/0957650917733128.
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Solar chimney power plants generate thermal heat and electrical power using the radiation from sun. These systems are characterized by their high costs. In fact, it is required to optimize the components of the solar system such as the collector, the chimney, the absorber, and the turbine. This paper focuses on the effect of the number of turbine blades on the air flow within a small prototype of a solar chimney power plant. Four configurations with different turbine blades are proposed to study the effect of the turbine blades number on the thermal characteristics of a solar chimney power plant. For each configuration, the distribution of the magnitude velocity, the air temperature, the pressure, the turbulent kinetic energy, and the turbulent viscosity are presented and discussed. This paper is identified to be of interest for engineers and designers for increasing the power output of a solar chimney power plant.
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Arun, Sreelekha. "Solar Chimney Power Plant - A Review on Latest Technological Advances for Performance Enhancement." International Journal for Research in Applied Science and Engineering Technology 9, no. VI (June 14, 2021): 2434–43. http://dx.doi.org/10.22214/ijraset.2021.34818.
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The energy consumption on global scale is continuously increasing, resulting in rapid use of energy resources available. Solar chimney power generation technology hence began to get growing attention as its basic model needs no depleting resources like fossil fuels for its functioning but only uses sunlight and air as a medium. It takes the advantage of the chimney effect and the temperature difference in the collector that produces negative pressure to cause the airflow in the system, converting solar energy into mechanical energy in order to drive the air turbine generator situated at the base of the chimney. Solar Chimney Power Plant (SCPP) brings together the solar thermal technology, thermal storage technology, chimney technology and air turbine power generation technology. However, studies have shown that even if the chimney is as high as 1000 m, the efficiency achievable is only around 3%. Hence, this review paper intents to put together the new technological advancement that aims to improve the efficiency of SCPP.
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F A Hayatu and M M Dukku. "Development and performance evaluation of a dual energy source solar dryer for tomatoes." Global Journal of Engineering and Technology Advances 11, no. 2 (May 30, 2022): 071–86. http://dx.doi.org/10.30574/gjeta.2022.11.2.0081.
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Solar energy is the most promising of the renewable energy sources in view of its apparent limitless potential. A Dual energy Source Solar Dryer was developed under Bauchi weather at latitude 9°14′ N and longitude 12°26′ E using locally available materials and the performance was evaluated. The essence of the dryer was to achieve the effective method of tomato preservation and eliminate the drudgery and product deterioration associated with traditional methods of open sun drying of tomatoes. This is in view of alleviating the weather limitation experienced by farmers in crop drying especially for tomatoes. The solar dryer consists of tray, reflective walls and glass roof, a preheating air absorber plate, inner panels for removal of moisture and chimney through which air stream passes across the dryer. Evaluation of the dryer showed a raised temperature of about 47 ℃ attainable in the drying chamber. The dryer temperature and drying rate was found to be higher than the natural open sun drying method. The dryer was able to reduce moisture content of tomato from initial moisture content of 94% wet basis to 4% in three days with effective drying time of 24 h, efficiency of 64%, air mass flow rate of 0.025 kg s-1 and drying rate of 0.03906 kg h-1. The results showed a considerable advantage of solar dryer over the traditional open sun drying method in terms of drying rate and less risk for spoilage.
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Lipnicki, Zygmunt, Marta Gortych, Anna Staszczuk, and Tadeusz Kuczyński. "The Theoretical Analysis of Mass and Energy Flow Through Solar Collector – Chimney System." Civil And Environmental Engineering Reports 24, no. 1 (March 28, 2017): 117–31. http://dx.doi.org/10.1515/ceer-2017-0008.
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Abstract The goal of the paper was to simplify the designing process for mass and energy flow through solar collector - chimney system. Theoretical analysis allowed to get involved system of three nonlinear analytical equations in dimensionless forms that have been saved. Dimensionless numbers for the problem are well known in the literature on fluid mechanics and thermodynamics: Reynolds, Grashof, Galileo, Biot and Prandtl. In the analyzed equations are also dimensionless geometric parameters expressing the ratios of basic geometrical dimensions of the collector system-chimney: the radius disc collector to the thickness gap, the height and radius of the chimney. In the system of equations, the Reynolds number is treated as the determined number, which is a novelty of the method used.