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Добірка наукової літератури з теми "SOLAR CHIMNEY DRYING SYSTEM"

Автор: Grafiati
Опубліковано: 11 вересня 2023

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Статті в журналах з теми "SOLAR CHIMNEY DRYING SYSTEM"

1

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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Анотація:
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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2

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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Анотація:
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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3

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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Анотація:
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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Анотація:
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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5

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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Анотація:
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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Анотація:
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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Анотація:
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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Анотація:
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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Анотація:
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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10

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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Дисертації з теми "SOLAR CHIMNEY DRYING SYSTEM"

1

Spencer, Scott. "An experimental investigation of a solar chimney natural ventilation system." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/MQ59298.pdf.

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2

Li, Y. "Thermal performance analysis of a PCM combined solar chimney system for natural ventilation and heating/cooling." Thesis, Coventry University, 2013. http://curve.coventry.ac.uk/open/items/0bca9412-8b49-4d3c-84e5-453e315d4c6b/1.

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Анотація:
Solar chimney is an important passive design strategy to maximize solar gain to enhance buoyancy effect for achieving adequate air flow rate and a desired level of thermal comfort inside a building. Therefore, solar chimney has the potential advantages over mechanical ventilation systems in terms of energy requirement, economic and environmental benefits. The main aim of this project is to study the technical feasibility of a solar chimney incorporating latent heat storage (LHS) system for domestic heating and cooling applications. The research work carried out and reported in this thesis includes: the development of a detailed theoretical model to calculate the phase change material (PCM) mass for solar chimney under specific climatic condition, the development of a CFD model to optimise the channel depth and the inlet and outlet sizes for the solar chimney geometry, experimental and numerical investigations of the thermal performance of the proposed system using a prototype set-up, a parametric study on the proposed system to identify significant parameters that affect the system performance was carried out by using the verified numerical model. The numerical and experimental study showed that the numerical model has the ability to calculate the PCM mass for the proposed system for the given weather conditions. The optimum PCM should be selected on the basis of its melting temperature, rather than its other properties such as latent heat. The experimental work on the thermal performance of the proposed system has been carried out. The results indicated that the LHS based solar chimney is technically viable. The outlet air temperature and the air flow rate varied within a small range during phase change transition period which are important for a solar air heating system. A numerical model was developed to reproduce the experimental conditions in terms of closed mode and open mode. The model results were in a close agreement with the experimental results particularly the simulated results for the discharging process. With the verified model, a comprehensive parametric analysis intended to optimise the thermal performance of proposed the system was performed. The results analysed are quantified in terms of charging/discharging time of the PCM, temperature difference between outlet air and inlet air of the solar chimney, and mass flow rate of the chimney, which are the most important quantities of the proposed system.
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3

JACONELLI, LIVIO, and PALM KIM JACONELLI. "A THERMAL NETWORK MODEL FOR AN EVAPORATIVE COOLING SYSTEM COMBINED WITH A SOLAR CHIMNEY." Thesis, KTH, Energiteknik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-192670.

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Анотація:
Syftet med denna studie är att, genom termiskt nätverksmodellering för kombinerad värme och massöverföring, undersöka möjligheten att integrera en solskorsten med en evaporationskyl. Avsikten är att potentiellt öka luftflödet runt kylen samt dess kylförmåga. Jämviktstillstånd samt transienta förlopp simuleras med hjälp av mjukvaruprogrammet MATLAB. Utfallet av studien indikerar att föreslagna tillämpningsområdet för solskorstenen ökar kylpotentialen för evaporationskylen. Solskorstenen kan generera ett tillräckligt luftflöde på mer än 0.5 m/s. Med en omgivningstemperatur på 30 C°, luftfuktighet på 40 % och ett luftflöde på 0.5 m/s kan evaporationskylen bibehålla 25 % lägre förvaringstemperatur gentemot omgivningstemperaturen.
The purpose of this study is to, through thermal network modelling and coupled heat and mass transfer analysis, investigate the cooling process of an evaporation fridge combined with a solar chimney. The solar chimney is connected to the evaporation fridge in an attempt to increase the airflow, around the evaporation fridge, and the cooling capacity. Steady state and transient regimes are simulated in the software MATLAB. The findings indicate that utilizing a solar chimney for the stated purposes will increase the cooling potential of the evaporation fridge. The solar chimney is able to produce a satisfactory air flow velocity of more than 0.5 m/s. With an ambient temperature of 30 C°, relative humidity at 40 % and an air flow rate of 0.5 m/s the evaporation fridge maintains a 25 % lower storage temperature compared to the ambient temperature.
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Talele, Suraj H. "A Performance Analysis of Solar Chimney Passive Ventilation System in the Unt Zero Energy Lab." Thesis, University of North Texas, 2013. https://digital.library.unt.edu/ark:/67531/metadc499996/.

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Анотація:
The purpose of this investigation is to find out suitability of the solar chimney natural ventilation system in a Zero Energy Lab located at the University of North Texas campus, to figure out performance of the solar chimney. Reduction in the heating and ventilation and air conditioning energy consumption of the house has been also analyzed. The parameters which are considered for investigation are volumetric flow rate of outlet of chimney, the absorber wall temperature and glass wall temperatures. ANSYS FLUENT 14.0 has been employed for the 3-D modeling of the solar chimney. The dimensions of the solar chimney are 14’2” X 7’4” X 6’11”. The flow inside solar chimney is found to be laminar and the simulation results show that maximum outlet volumetric flow rate of about 0.12m3/s or 432 cfm is possible from chimney. The experimental velocity of chimney was found to be 0.21 m/s. Density Boussinesq approximation is considered for the modeling. Velocity and temperature sensors have been installed at inlet and outlet of the chimney in order to validate the modeling results. It is found that based on simulated volumetric flow rate that cooling load of 9.29 kwh can be saved and fan power of 7.85 Watts can be saved.
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Serem, Vincent Kipyego Arap. "Forced air solar system for drying of Arabica coffee in Kenya." Thesis, McGill University, 1987. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=63902.

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6

Beviss-Challinor, Lauren Margaret. "Design, build and test a passive thermal system for a loft : a roof solar chimney application for South African weather conditions." Thesis, Stellenbosch : Stellenbosch University, 2007. http://hdl.handle.net/10019.1/348.

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Анотація:
Thesis (MEng (Mechanical and Mechatronic Engineering))--Stellenbosch University, 2007.
ENGLISH: The design, construction and testing of a passive thermal system, a roof solar chimney, for a loft is considered. Unlike conventional solar chimneys the solar collector is constructed from corrugated iron roof sheets with the aim that it can be integrated into existing buildings at a lower cost or used in low cost housing developments. The main objective of the study was to determine the feasibility of such low-cost design to regulate thermal conditions in a loft, that is heating the loft during winter and enhancing natural ventilation during summer, by carrying out an experimental and analytical study. The results obtained from the experimental study showed that for winter the solar chimney, having a channel width, depth and length of 0.7 m, 0.1 m and 1.8 m respectively and with a peal solar radiation of 850 W/m², heated the room air 5°C higher than the ambient temperature during the hottest periods of the day, which is only marginally better than a loft with conventional roof insulation. At night, it was found that reverse airflow occurred through the chimney, cooling the loft down to ambient temperature, due to radiation heat loss from the roof collector to the night sky. For summer operation, the experimental data showed that the chimney was able to maintain the loft at ambient temperature and the analytical study found that the chimney was able to enhance natural ventilation effectively, reaching air exchange rate of 6.6 per hour for the 4.6 m³ volume space. It was also found that the chimney’s performance dropped rapidly and significantly during periods of low solar radiation and at night. A sensitivity analysis illustrated that for both summer and winter operation, the size, tilt angle and absorptivity of the roof collector greatly effected the efficiency and mass flow rates of the system, agreeing well with other literature. These results prove that this low cost solar chimney cooling design was feasible to enhance natural ventilation mainly during hot summer conditions with high solar radiation. Compared to a loft with only conventional roof insulation, the chimney did not perform effectively during the winter to heat the loft up, meaning that winter operation for this specific design is not feasible. Possible improvements to the design include using construction materials with higher thermal capacities to retain heat energy and ensure continued operation during periods of low solar radiation, as well as using selective absorber coatings on the collector surface. It is recommended that further work on the project include the integration of these improvements into the present design and to use the findings obtained from the sensitivity analysis to improve system efficiencies. CFD analysis of the test-rig will be insightful as an additional means to validate and compare with the analytical and experimental data obtained in this report. With the continuation of these studies, this low-cost solar chimney design can be optimised, validated on a commercial scale and built into existing and new housing developments. Incorporating such a passive thermal device will aid homeowners in air regulation and thermal comfort of their living space as well as saving on energy requirements.
Sponsored by the Centre for Renewable and Sustainable Energy Studies, Stellenbosch University
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Grosso, Stefano <1990&gt. "Performance testing of a combined solar and heat-drying system for biological sludge." Master's Degree Thesis, Università Ca' Foscari Venezia, 2015. http://hdl.handle.net/10579/5862.

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Анотація:
The present work has the main aim of testing and implementing the performance of an innovative system for biological sludge drying, which combines an inner high-performance sludge burner with solar air heaters. The research question is how to implement the design and structure of the drying system, defining the best working conditions (best temperature, materials and dimensions of its components, etc.). The state-of-the-art of water treatment and in particular of biological sludge from urban sewage is introduced, with an insight also on management and investment costs. The solar drying technology is then described and the project of the system is presented. In addition, the possible environmental gains that the technology could bring are shown, e.g. saving in transportation because of the diminution in volume of the biological sludge with the drying process. Since the prototype is still not completed, the testing has been done separately in a solar drying system and in an oven, in order to test the response of the biological sludge to solar and thermal heating. In addition, an analysis of the emissions in the atmosphere and a measure of the calorific power during the combustion phase will be done: these data are necessary for the development of the project, because the heat produced with the combustion will be put back inside the system to dry the wet sludge, obtaining a final product with 85% of dry matter. The economical attractiveness of the system is estimated to be high since it can produce large cost savings and it is a product completely new in the market, in terms of expected performances, design, technology and dimensions.
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Nakielska, Magdalena. "Model obliczeniowo-funkcjonalny komina słonecznego wspomagającego wentylację grawitacyjną w obiektach budowlanych." Rozprawa doktorska, Uniwersytet Technologiczno-Przyrodniczy w Bydgoszczy, 2015. http://dlibra.utp.edu.pl/Content/819.

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TRAJANO, Tarcisio Oliveira. "Desenvolvimento de um sistema automatizado para medir a variação de massa na câmara de secagem de um secador solar de frutas." Universidade Federal de Campina Grande, 2017. http://dspace.sti.ufcg.edu.br:8080/jspui/handle/riufcg/356.

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Automatizar o processo de medição da variação de massa do produto em um secador solar é um avanço em relação ao procedimento atualmente utilizado que é manual. O objetivo deste trabalho é desenvolver essa automatização utilizando tecnologia apropriada para ser incorporada ao secador solar em desenvolvimento na Universidade Federal de Campina Grande (UFCG). Esses secadores precisam ser simples e de baixo custo para serem utilizados pelo ambiente da agricultura familiar. O processo utilizado consistiu na construção e teste de um protótipo de uma câmara de secagem com forma retangular, de dimensões 32,2 x 43,0 x 34,0 cm, acoplado ao coletor solar. No sistema de medição automatizado foi utilizado uma balança com bandeja em tela de alumínio, de dimensões 37,0 x 21,0 x 6,0 cm, fixada por uma haste de madeira a uma célula de carga, tipo extensômetro de folha, que envia sinais de tensão, proporcionais à variação de massa do produto que esta sendo seco, a uma plataforma de aquisição de dados com Arduino UNO integrada ao equipamento. A célula de carga fixada a bandeja foi instalada dentro e, num experimento seguinte, fora da câmara de secagem. O sistema de aquisição e tratamento de dados também foi instalado na parte externa da câmara de secagem. Foram realizados testes preliminares de medição com a utilização de lâmpadas halógenas, e os resultados obtidos mostraram temperaturas, no interior da câmara, de aproximadamente 45°C ±5ºC, utilizando um peso padrão de 100g. Os resultados obtidos durante a secagem da banana prata (Musa spp), permitiram a construção das curvas de variação de massa de banana e a curva de cinética de secagem. Também foram obtidas as curvas que mostram a variação da temperatura do ar de secagem no interior da câmara. Essa temperatura ficou na faixa de 30ºC a 40ºC, abaixo do esperado que era de 50°C ±10ºC. Por isso a banana atingiu apenas o valor de 44% de teor de umidade em base úmida, acima dos 25% que noBrasil é o máximo para que a banana seca seja considerada banana passa. Foram observadas interferências indesejáveis durante o processo de medição automatizada, as estratégias utilizadas (filtros) para reduzir as interferências não foram suficientes para reduzi-las totalmente e seguirão sendo estudadas em trabalhos futuros.
Automating the process of measuring the mass variation of the product in a solar dryer is an advance over the currently used procedure which is manual. The objective of this work is to develop this automation using appropriate technology to be incorporated into the developing solar dryer at the Federal University of Campina Grande (UFCG). These dryers need to be simple and inexpensive to be used by the family farming environment. The process used consisted in the construction and testing of a prototype of a drying chamber with rectangular shape, dimensions 32.2 x 43.0 x 34.0 cm, coupled to the solar collector. In the automated measurement system, a scale was used with aluminum tray, measuring 37.0 x 21.0 x 6.0 cm, fixed by a wooden rod to a load cell, type extensometer of sheet, which sends voltage signals, proportional to the mass variation of the product being dried, to a data acquisition platform with Arduino UNO integrated to the equipment. The loading cell attached to the tray was installed inside and, in a subsequent experiment, outside the drying chamber. The data acquisition and processing system was also installed on the outside of the drying chamber. Preliminary measurement tests were carried out with the use of halogen lamps, and the results obtained showed temperatures within the chamber of approximately 45°C ± 5°C, using a standard weight of 100 g. The results obtained during the drying of the silver banana (Musa spp) allowed the construction of the banana mass variation curves and the drying kinetic curve. Curves showing the temperature of the drying air inside the chamber were also obtained. This temperature was in the range of 30°C to 40°C, below that expected to be 50°C ± 10°C as a consequence of the low intensity of solar radiation on the days of experiment. Therefore the banana reached only the value of 44% moisture content on wet basis, above the desirable 25%. Undesirable interferences were observed during the automated measurement process, the strategies used (filters) to reduce interferences were not enough to reduce them completely and will continue to be studied in future works.
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LIMA, Wellington Sousa. "Análises de sistemas de secagem: solar, elétrico e misto na produção de banana passa." Universidade Federal de Campina Grande, 2017. http://dspace.sti.ufcg.edu.br:8080/jspui/handle/riufcg/969.

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Este trabalho apresenta um estudo comparativo de sistemas de secagem para produção de banana passa. Foram utilizados um secador solar de exposição indireta com sistema de aquisição e controle das propriedades termodinâmicas do ar de secagem, e um secador elétrico automatizado com sistema de supervisão e controle embarcados . Os sistemas de secagem estudados neste trabalho foram: secagem solar, secagem elétrica e secagem mista (secagem solar seguida de secagem elétrica). Os testes experimentais foram realizados na UFCG em Campina Grande, PB, para secagem de banana prata (Musa spp.). O produto final obtido pelos três sistemas de secagem apresentou boa qualidade em relação ao aspecto visual, com um percentual de umidade em base úmida menor que 25%, compatível com o recomendado pela Resolução RDC n° 272/05 da ANVISA. O sistema de aquisição e controle de dados, como inovação no secador solar, utilizando a plataforma Arduino, garantiu a medição de temperatura e umidade relativa do ar de secagem nas entradas e saídas do coletor solar e da câmara de secagem, e também o acionamento e controle da convecção forçada no sistema de secagem para manter a temperatura no interior da câmara de secagem entre 40ºC e 60ºC. Como resultado, são apresentados os valores obtidos para rendimento do secador solar, consumo específico de energia (CEE), eficiência do processo de secagem e tempo de secagem. Por meio dos experimentos com o secador solar e com o secador elétrico foram obtidas as curvas de cinética de secagem da banana. Os resultados foram comparados e mostraram que o modelo matemático de Page é apropriado para predizer o tempo de secagem. O coeficiente de determinação (R²) obtido na secagem elétrica, na secagem mista e na secagem solar com controle, foram superiores ao obtido na secagem solar sem controle, isso demostra a importância do controle das propriedades termodinâmicas nos processos de secagem. Com relação ao CEE, o processo de secagem elétrica apresentou um CEE de 379,33 kWh por ciclo com temperatura de 45ºC e 225,54 kWh por ciclo com temperatura de 55ºC. Por outro lado o processo de secagem mista apresentou um CEE de 295,87 kWh por ciclo, a uma temperatura de 45ºC, e o processo de secagem solar apresentou um CEE médio de 45,83 kWh por ciclo. Isso mostra a grande vantagem comparativa do secador solar em relação ao secador elétrico. Com relação à eficiência mássica para os três processos de secagem, os mesmos apresentaram eficiências mássicas equivalentes em torno de 89%, o que já era esperado. Com relação aos rendimentos térmicos do secador solar, obtidos nos processos de secagem solar com controle e sem controle da temperatura , foram respectivamente 27,85% e 30,65%. Esses resultados são ligeiramente maiores que os reportados na literatura, o que indica que o secador solar desenvolvido na UFCG apresenta um elevado padrão na secagem de banana, além do fácil manuseio, construção e operacionalidade.
This paper presents a comparative study of drying systems for the production of dried bananas. An indirect solar exposure dryer with acquisition system and control of the thermodinamic properties of the drying air, and an automatized electric dryer with embedded control and supervision system were used. The drying systems studied in this paper were: solar drying, electrical drying and mixed drying (solar drying followed by electrical drying). The experimental tests were performed at the UFCG in Campina Grande, PB, for the drying of bananas (Musa spp.). The final product obtained by the three drying systems presented good visual aspect, scent and flavour, and moisture percentage at moist base less than 25%, compatible to the resolution RDC nº 272/05 of the ANVISA. The acquisition system a nd data control, added as inovation at the solar dryer, using the Arduino plataform, granted the measurement of the temperature and air relative moisture of drying air, both in the entrance and exit of the solar colector of the drying chamber, and also the activation and control of the forced convection of the drying system to keep the temperature in the drying chamber between 40ºC and 60ºC. As results, the obtained values to the drying system efficiency are presented, specific comsuption of energy (CEE), drying system efficiency and drying time. Through the experiments with the solar and the electric dryers, the curves that represent the drying kinectics of the banana were obtained. The results were compared and showed that Page’s mathematical model is adequate to predict the drying time. The determination coefficient (R²) obtained at the electric dryer was superior to the solar dryer, this shows that the control system of the thermodinamics properties of the drying air is more efficient on the electric dryer. In relation to the CEE, the electric drying showed a CEE of 379.33 kWh per cycle with a temperature of 45ºC and 225.54 kWh per cycle at the temperature of 55ºC . On the other hand, the mixed drying had a CEE of 295.87 kWh per cycle, at a temperature of 45 ºC, and the solar drying a medium CEE of 45.83 kWh per cycle. This shows the great comparative advantage of the solar dryer when compared to the electric dryer. In relation to the massic efficiency to the 3 drying processes, they showed equivalente massi c efficiency around 89%, which was expected. In relation to the thermic efficiencies of the solar dryer, obtained on the experiments with and without temperature control, were respectively 27.85%, 30.65%, these results show that the obtained resulsts are slightly superior to the results reported on the literature, which indicates that the solar dryer under development in the UFCG shows high efficiency to perform the drying of bananas, although its easy to construct and operate.
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Книги з теми "SOLAR CHIMNEY DRYING SYSTEM"

1

Torres, Jose Antonio. Mathematical simulation of a solar drying system. 1987.

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2

Yang, Kun. Observed Regional Climate Change in Tibet over the Last Decades. Oxford University Press, 2017. http://dx.doi.org/10.1093/acrefore/9780190228620.013.587.

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The Tibetan Plateau (TP) is subjected to strong interactions among the atmosphere, hydrosphere, cryosphere, and biosphere. The Plateau exerts huge thermal forcing on the mid-troposphere over the mid-latitude of the Northern Hemisphere during spring and summer. This region also contains the headwaters of major rivers in Asia and provides a large portion of the water resources used for economic activities in adjacent regions. Since the beginning of the 1980s, the TP has undergone evident climate changes, with overall surface air warming and moistening, solar dimming, and decrease in wind speed. Surface warming, which depends on elevation and its horizontal pattern (warming in most of the TP but cooling in the westernmost TP), was consistent with glacial changes. Accompanying the warming was air moistening, with a sudden increase in precipitable water in 1998. Both triggered more deep clouds, which resulted in solar dimming. Surface wind speed declined from the 1970s and started to recover in 2002, as a result of atmospheric circulation adjustment caused by the differential surface warming between Asian high latitudes and low latitudes.The climate changes over the TP have changed energy and water cycles and has thus reshaped the local environment. Thermal forcing over the TP has weakened. The warming and decrease in wind speed lowered the Bowen ratio and has led to less surface sensible heating. Atmospheric radiative cooling has been enhanced, mainly through outgoing longwave emission from the warming planetary system and slightly enhanced solar radiation reflection. The trend in both energy terms has contributed to the weakening of thermal forcing over the Plateau. The water cycle has been significantly altered by the climate changes. The monsoon-impacted region (i.e., the southern and eastern regions of the TP) has received less precipitation, more evaporation, less soil moisture and less runoff, which has resulted in the general shrinkage of lakes and pools in this region, although glacier melt has increased. The region dominated by westerlies (i.e., central, northern and western regions of the TP) received more precipitation, more evaporation, more soil moisture and more runoff, which together with more glacier melt resulted in the general expansion of lakes in this region. The overall wetting in the TP is due to both the warmer and moister conditions at the surface, which increased convective available potential energy and may eventually depend on decadal variability of atmospheric circulations such as Atlantic Multi-decadal Oscillation and an intensified Siberian High. The drying process in the southern region is perhaps related to the expansion of Hadley circulation. All these processes have not been well understood.
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Частини книг з теми "SOLAR CHIMNEY DRYING SYSTEM"

1

Kumar, Anil, Harsh Deep, Om Prakash, and O. V. Ekechukwu. "Advancement in Greenhouse Drying System." In Solar Drying Technology, 177–96. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-3833-4_5.

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2

Sung, Ling Leh, Mohd Suffian bin Misran, Md Tarek Ur Rahman Erin, and Md Mizanur Rahman. "Solar Chimney and Turbine-Assisted Ventilation System." In Cold Inflow-Free Solar Chimney, 139–69. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-33-6831-6_8.

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3

Prakash, Om, Anil Kumar, Prashant Singh Chauhan, and Daniel I. Onwude. "Energy Analysis of the Direct and Indirect Solar Drying System." In Solar Drying Technology, 529–42. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-3833-4_19.

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4

Huang, HuiLan, Hua Zhang, Yi Huang, and Feng Lu. "Simulation Calculation on Solar Chimney Power Plant System." In Challenges of Power Engineering and Environment, 1158–61. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-76694-0_216.

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5

Karim, M. A., and Zakaria Mohd Amin. "Analytical Modelling of Integrated Solar Drying System." In Renewable Energy in the Service of Mankind Vol II, 867–79. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-18215-5_79.

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6

Nouar, Hadda, Toufik Tahri, Younes Chiba, and Abdelghani Azizi. "Thermal Investigation of a Solar Chimney Power Plant System: CFD Approach." In Advances in Green Energies and Materials Technology, 367–74. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-0378-5_48.

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7

Sopian, K., G. Y. Abusaibaa, R. Abdullah, H. Jarimi, A. Ibrahim, A. F. Abdullah, and A. B. Al-Aasam. "Performance of Solar Assisted Dual Condenser Heat Pump Drying System." In Lecture Notes in Mechanical Engineering, 254–58. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-3179-6_46.

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8

Moussaoui, Haytem, Ahmed Aït Aghzzaf, Ali Idlimam, and Abdelkader Lamharrar. "Modeling of a Forced Convection Solar Drying System by Experimental Designs." In Recent Advances in Environmental Science from the Euro-Mediterranean and Surrounding Regions, 1497–99. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-70548-4_436.

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9

Singh, S. P., and Ankur Nagori. "Economic Feasibility of Refrigeration Waste Heat-Assisted Solar Hybrid Drying System." In Lecture Notes in Mechanical Engineering, 441–54. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-15-9678-0_39.

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10

Augustus Leon, M., and S. Kumar. "Evaluation of a Solar-Biomass-Rock Bed Storage Drying System, and its Application for Chilli Drying." In Proceedings of ISES World Congress 2007 (Vol. I – Vol. V), 1990–97. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-75997-3_405.

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Тези доповідей конференцій з теми "SOLAR CHIMNEY DRYING SYSTEM"

1

Buonomo, Bernardo, Oronzio Manca, Sergio Nardini, and Gianluca Tartaglione. "Numerical Simulation of Convective-Radiative Heat Transfer in a Solar Chimney." In ASME 2014 12th Biennial Conference on Engineering Systems Design and Analysis. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/esda2014-20390.

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Solar chimney is a new method to produce electrical power. It employs solar radiation to raise the temperature of the air and the buoyancy of warm air to accelerate the air stream flowing through the system. By converting thermal energy into the kinetic energy of air movement, solar chimneys have a number of different applications such as ventilation, passive solar heating and cooling of buildings, solar-energy drying, and power generation. Moreover, it can be employed as an energy conversion system from solar to mechanical. A component, such as a turbine or piezoelectric component, set in the path of the air current, converts the kinetic energy of the flowing air into electricity. In this paper, a numerical investigation on a prototypal solar chimney system integrated in a south facade of a building is presented. The chimney is 4.0 m high, 1.5 m wide whereas the thickness is 0.20 m for the vertical parallel walls configuration and at the inlet 0.34 m and at the outlet 0.20 m for convergent configuration. The chimney consists of a converging channel with one vertical wall and one inclined of 2°. The analysis is carried out on a three-dimensional model in airflow and the governing equations are given in terms of k-ε turbulence model. The problem is solved by means of the commercial code Ansys-Fluent. The numerical analysis was intended to examine the effect of the solar chimney’s height and spacing. Further, comparison between radiative and non-radiative model is examined and discussed. Results are given in terms of wall temperature distributions, air velocity and temperature fields and transversal profiles for a uniform wall heat flux on the vertical wall equal to 300 W/m2. Thermal and fluid dynamics behaviors are evaluated in order to have some indications to improve the energy efficiency of the system.
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2

Guo, Yongqing, Xiaodai Xue, Qingsong Li, Zhi'ao Li, Yang Si, Kai Li, and Shengwei Mei. "Experimental study of solar chimney power plant system." In 2017 Chinese Automation Congress (CAC). IEEE, 2017. http://dx.doi.org/10.1109/cac.2017.8244052.

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3

Suherman, Suherman, Fa’ireza Rafli Arfiansyah, Rizqi Sa’adatun Ni’mah, Evan Eduard Susanto, and Hadiyanto Hadiyanto. "Coffee bean drying using ventilation - Photovoltaic solar drying method." In THE 6TH INTERNATIONAL CONFERENCE ON ENERGY, ENVIRONMENT, EPIDEMIOLOGY AND INFORMATION SYSTEM (ICENIS) 2021: Topic of Energy, Environment, Epidemiology, and Information System. AIP Publishing, 2023. http://dx.doi.org/10.1063/5.0126487.

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4

Nguyen Vu Lan. "Improvement of conventional solar drying system." In 2017 International Conference on System Science and Engineering (ICSSE). IEEE, 2017. http://dx.doi.org/10.1109/icsse.2017.8030964.

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5

Wong, Nyuk Hien, Alex Yong Kwang Tan, Kian Seng Ang, Stephen Mok, and Alice Goh. "Performance Evaluation of Solar Chimney System in the Tropics." In International Conference on Sustainable Design and Construction (ICSDC) 2011. Reston, VA: American Society of Civil Engineers, 2012. http://dx.doi.org/10.1061/41204(426)38.

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6

Huang, Huilan, Gang Li, and Hua Zhang. "Experimental Performance of a Solar Collector in Solar Chimney Power Plant System." In 2010 International Conference on Electrical and Control Engineering (ICECE). IEEE, 2010. http://dx.doi.org/10.1109/icece.2010.907.

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7

Chai, Adrian Ngu Ming, M. Ibrahim, Cheah Bin Chuan, and B. F. Yousif. "On the Development of Solar Drying System." In ASME 2009 International Mechanical Engineering Congress and Exposition. ASMEDC, 2009. http://dx.doi.org/10.1115/imece2009-12294.

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In the present work, solar thermal drying system was developed. The main purpose of solar thermal drying system is to dry local vegetables and fruits. The drying system contained of two main parts as heat collector and the food drying cabinet. It is a force convection indirect type absorbing maximum solar radiation by the heat collector and provides heated air flow to the cabinet via two fans at the air inlet/outlet. The heat collector was inclined at 23.5° angle which suitable to the location for absorption of maximum solar radiation. Experiments were performed to test the efficiency of the solar heat collector and the cabinet at different daily times and operating conditions. The results revealed that 98.8°C temperature was achieved under static air condition. The air temperature at the inlet of the cabinet under both natural and forced air velocities was about 62.8°C. During the experiments, the cabinet was loaded with 426g of banana slices having an initial moisture content of 80%. The designed drying system managed to achieve a final desired moisture content of 15% within effective period of 7 hours without losing the product color.
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8

Eduardo Predolin, RODRIGO, Vicente Luiz Scalon, and Geraldo Luiz Palma. "Development of natural convection solar drying system." In 18th Brazilian Congress of Thermal Sciences and Engineering. ABCM, 2020. http://dx.doi.org/10.26678/abcm.encit2020.cit20-0603.

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9

Harun, Darwin, Muhammad Ilham Maulana, Hasan Akhyar, and Husaini. "Experimental investigation on open sun-drying and solar drying system of bilimbi." In 2016 6th International Annual Engineering Seminar (InAES). IEEE, 2016. http://dx.doi.org/10.1109/inaes.2016.7821947.

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10

Jime´nez, M. J., J. D. Guzma´n, M. R. Heras, J. Arce, J. P. Xama´n, and G. Alvarez. "Thermal Performance of a Natural Ventilation System." In ASME 2010 4th International Conference on Energy Sustainability. ASMEDC, 2010. http://dx.doi.org/10.1115/es2010-90264.

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Natural ventilation in buildings using solar passive systems, such as solar chimneys, has emerged in the last years. Several theoretical and experimental studies in the literature show that their design parameters strongly depend on the ambient conditions, in which they are installed. In order to increase the knowledge of this kind of systems, this work presents the thermal behavior of a stand alone experimental solar chimney during one year. The dimensions of the solar chimney are 5.60 m high, 1.0 m width, and 0.52 m depth. The absorber plate is made of a common reinforced concrete wall of 4.5 m high, 1.0 m wide and 0.15 m depth. This system was designed by Marti´ J., and Heras M.R. in 2003 [1,2] and it is located in the Laboratorio de Ensayos Energe´ticos para Componentes de la Edificacio´n (LECE) in the Plataforma Solar of Almeri´a (PSA) in Spain. The entrance of this solar chimney was redesigned in 2007 by Arce et al. [3] and also the instrumentation of the system was increased and improved. During one year, the solar chimney was monitored and several experimental variables were measured. The results present the temperature profiles of the different measured elements of the solar chimney as well as the air mass flow rate through the solar chimney channel. It was observed that the effect of the outdoor wind added to the thermal effects plays an important role affecting the performance of the solar chimney studied.
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