Journal articles: 'Plate solar absorber'

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Suwandono, Purbo, and Nova Risdiyanto Ismail. "Pengaruh Bentuk Permukaan Absorber Pelat Terhadap Produktivitas dan Efisiensi Solar Still." Jurnal Energi dan Teknologi Manufaktur (JETM) 2, no. 02 (December 31, 2019): 25–30. http://dx.doi.org/10.33795/jetm.v2i02.42.

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Based on previous research, research on the development of solar distillation models is needed. Development of absorbent plates (absorber) using cast concrete material with fin, wave and flat models as a comparison. The fin and wave absorber plates can expand the surface, thereby increasing the intensity of solar radiation received by the absorber. Cast concrete is a porous material that can absorb sea water and make a thin layer, making it easier for the evaporation process and can improve solar distillation performance In this study using the experimental method. Solar still research by examining the surface of a cast concrete absorber plate. The surface of the absorbent plate used is the fin, wave and flat / conventional models. Cast concrete uses stone, iron sand, PCC cement and water. The study used variations in water volume The research resulted in the surface shape of the fin model can increase the productivity of fresh water and the efficiency of solar still using a plate absorbent fin model is higher than the wave and flat models. A smaller volume of sea water can increase productivity higher than a larger volume of sea water.

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Medina Carril, Diego Manuel, José Gonzalo Carrillo Baeza, Ruben Dominguez Maldonado, and Francis Aviles Cetina. "Finite element analysis of a solar collector plate using two plate geometries." Ingeniería e Investigación 36, no. 3 (December 19, 2016): 95. http://dx.doi.org/10.15446/ing.investig.v36n3.56071.

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The thermal behavior of an absorber plate in a solar collector is investigated using finite element analysis. The thermal behavior and efficiency of two absorber plate geometries are studied, using a typical solar collector with a rectangular profile as reference, and a proposed absorber plate with curved geometry. An analysis of the most important parameters involved in the design of the absorber plate was carried out, indicating that the curved geometry of the absorber plate yields an average efficiency ~25% higher than the conventional rectangular geometry. The results suggest that a curved profile made of materials such as aluminum with thermal conductivity higher than 200W/m°C, plate thickness of the order of 2-3mm and with a large density of tubes per unit area of the collector´s plate greatly benefits the thermal efficiency of the solar collector.

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Rao, P. Bhagavan. "CFD Analysis of Solar Absorber Plate." International Journal for Research in Applied Science and Engineering Technology 6, no. 4 (April 30, 2018): 3169–78. http://dx.doi.org/10.22214/ijraset.2018.4526.

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N. Jihad, Mohammed, Nabil J. Yasin, and Kadhum A. Jehhef. "The effect of using ribbed absorber plates on enhancing the heat transfer of solar chimneys." Journal of University of Shanghai for Science and Technology 23, no. 07 (August 1, 2021): 1431–44. http://dx.doi.org/10.51201/jusst/21/07316.

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Under different geometrical features and in Iraqi environmental circumstances, a numerical and experimental investigation of a solar chimney was carried out the study that dealt with an important aspect, which is to increase the surface area of the absorbent plate while maintaining the outer dimensions and limits by using three model of absorber surface (flat plate, Triangular Vgrooved corrugated plate and trapezoidal corrugated absorber plate). the work was carried out using a single vertical solar chimney of a single room has a volume 27m3 modeling 1m3 placed on the southern wall of wooden chamber having a size of (1 × 1 ×1) m and absorber plate (0.9×0.99) m. In addition to studying the effect of the air gap width (0.1, 0.2) m on the test model with all absorber plate are used at different inclination angles inward (0°,5°,10° and 15°) the test model. All variable was taken with varying solar radiation intensity (150,250,350,450,550 and 700) W/m2 along the day time. Numerical simulation of the test models using the Ansys Fluent program V18.1 to solve the governing continuity, momentum and energy equations with a standard (k-ε)standard turbulence model associated with laws of the wall along solid boundaries were solved numerically, Experimental and Theoretical results of the present study show that the optimum model of the test absorber plates with air gap width and inclination angle according to Air change per hour (ACH) calculation is Triangular V-grooved absorber plate with air gap width 0.2m and inclination angle 10°. For this inclination angle and air gap width at I700 W/m2 the ACH is about 10 % higher than model1 (flat absorber plate) and more than model3(trapezoidal plate) by 17%.

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Mustafa, S. S. "The Performance and Efficiency of Flat Plate Collectors with Different Absorbers and Different Convection Heat Loss Levels." Material Science Research India 16, no. 3 (October 9, 2019): 261–70. http://dx.doi.org/10.13005/msri/160309.

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The performance of a flat plate solar collector with thin absorber is studied. The temperature of the absorber and its variation along the local day time is obtained by solving a heat balance equation. The temperature of the working fluid is also estimated. A published solar source functionto predict the hourly daily incident solar irradiance on horizontal surface is considered. Five absorbers of different materials: Copper, Aluminum, Stainless steel, Glass and Mica are treated. Two cooling conditions at the absorber front irradiated surface are also taken into consideration. Factors affecting its efficiency are revealed.

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O'Keefe, MJ, and JLA Francey. "Thermal Performance of Solar Collectors with EPDM Absorber Plates." Australian Journal of Physics 41, no. 4 (1988): 623. http://dx.doi.org/10.1071/ph880623.

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An experimental study of flat-plate solar collectors using ethylene, propylenediene monomer (EPDM) absorber plates is descn"bed. In spite of the high thermal resistance of this material the performance is found to compare well with metal absorbers and to be in agreement with the Hottel-Whillier-Bliss equation. There is, however, an observed increase in the heat loss coefficient for mass flow rates below a critical value.

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Shi, Yan Hua, Liu Juan Zhu, Yuan Zhe Cao, and Ming Cheng Shen. "Numerical Simulation Study on Optimization of Solar Flat-Plate Collector." Applied Mechanics and Materials 635-637 (September 2014): 523–27. http://dx.doi.org/10.4028/www.scientific.net/amm.635-637.523.

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Solar flat-plate collector is an important component in solar-thermal system, and its optimization is critical for the efficiency of energy utilization. In this paper, a comparative study on the thermal performance of solar flat-plate collector was carried out by numerical simulation under the conditions of different thicknesses and materials of absorber plate. The results show that the increase of absorber plate thickness contributes to restraining convection loss. The collector efficiency levels off when the absorber plate thickness reaches a certain value. In considering thermal performance and production cost, aluminum is an optimal material for absorber plate.

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Syahruddin, Andi Syahrinaldy, Jalaluddin Jalaluddin, and Azwar Hayat. "Performance Analysis Of Solar Water Heating System With Plate Collector Integrated Pcm Storage." EPI International Journal of Engineering 3, no. 2 (January 23, 2021): 143–49. http://dx.doi.org/10.25042/epi-ije.082020.09.

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Availability of solar energy as a renewable energy source is very abundant and inexhaustible. Solar water heater is an equipment that utilizes solar energy as a source of energy. The thermal performance of a solar water heater system using absorber plate with phase change material (PCM) as thermal energy storage is presented in this study. Two design of solar water heater collectors with absorber plate variations, i.e. an absorber plate with PCM storage and absorber plate without PCM storage were investigated experimentally and numerically simulation. First, the material properties of paraffin wax as PCM storage was analized analyticaly. Every shape model of solar water heater systems were imported and simulated at three variations of constant solar radiation, i.e. 400 W/m2, 700 W/m2, and 1000 W/m2. The simulation using a computational fluid dynamic (CFD) fluent software. The results showed that the average collector efficiency between absorber plate with and without PCM storage is 70.98 % using experimental study and 67.73 % using numerical simulation study.

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Alfin amanda, Alfin Amanda, Nova R. Ismail, and M. Agus Sahbana. "ANALISA BENTUK PERMUKAAN PELAT PENYERAP SPONGE TERHADAP KINERJA SOLAR STILL DOUBLE SLOPE TIPE V." Jurnal Energi dan Teknologi Manufaktur (JETM) 3, no. 01 (June 30, 2020): 17–22. http://dx.doi.org/10.33795/jetm.v3i01.51.

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This study aims to determine the surface shape of the sponge absorbent plate to the performance of the solar still double slope type V. The surface shape of the sponge absorbent plate uses sponge models of triangles, fins, waves and flat with a thickness of 5 cm. experimental Tests methods use direct solar radiation and using sea water is used as raw material. The experiment produced 4,527 liters of condensate water with highest solar still efficiency of 50.14% using a sponge wave absorber plate with an area of 13,940.76 cm2. The Sea water disability to flow capillary to the surface of the absorbent plate affecting the performance of solar still.

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Oshida, Isao, and Akio Suzuki. "Optical Cascade Heat-Collection for Effective Solar Energy Gain." Journal of Solar Energy Engineering 109, no. 4 (November 1, 1987): 298–302. http://dx.doi.org/10.1115/1.3268221.

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Optical cascade heat collection of solar energy has proved effective for gaining thermal energy in the medium temperature region (80∼150° C). The cascade system consists of two separate absorbers (one hot and the other warm) and an optical system including CPC’s and Fresnel lenses which concentrate the direct solar radiation on one of the two absorbers. The temperature of the heat transfer fluid can be increased effectively if the fluid flows into the warm absorber first and then flows into the hot absorber. This type of solar collector, having no mechanical tracking device, can theoretically collect heat at a higher temperature than usual flat-plate collectors.

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Billy, Anak Sup, Tanti Zanariah Shamshir Ali, Mohd Farid Zainudin, and Abu Bakar Rosli. "Experimental Study of Water Heating Efficiency between Aluminium and Copper Absorber Plate in Solar Flat Plate Collector." Applied Mechanics and Materials 660 (October 2014): 709–13. http://dx.doi.org/10.4028/www.scientific.net/amm.660.709.

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Solar water heating using flat plate collector (FPC) is the widest application that had been used in residential and commercial area. The material for the absorber plate in FPC should have good thermal conductivity to ensure a high value for the heat removal yet able to store heat slightly high during minimum solar radiation period. An experimental of FPC water heating is conducted using copper and aluminium as absorber plate. The plates were exposed under intense sun radiation more than 800w/m2. The analysis is performed on the relationship between the material and the temperature difference of water. The results represented the heat gain and water heating efficiency between aluminium and copper. Aluminium had heat gain of 1100.69W. Copper had the heat gain of 1025.36W. The water heating efficiency calculated for aluminum is 0.97 while copper is 0.93. The paper finally justified that aluminium is better as the absorber plate in this flat plate solar collector compare to copper plate.

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Muhammad Amin Harun, Zafri Azran Abdul Majid, Zairul Azrul Zakaria, Ahmad Faris Ismail, Sany Izan Ihsan, Kamaruzzaman Sopian, Ahmad Fadzil Sharol, and Amir Abdul Razak. "Study on Selection of a Suitable Material and The Parameters for Designing a Portable Flat Plate Base-Thermal Cell Absorber (FPBTCA)." Journal of Advanced Research in Fluid Mechanics and Thermal Sciences 85, no. 1 (July 29, 2021): 71–92. http://dx.doi.org/10.37934/arfmts.85.1.7192.

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Several types of flat plate solar collectors have been designed and developed with various technical parameters involved in the design. The inappropriate flat plate solar collector parameter design and material chosen will affect its performance. Investigation on the effect of flat plate absorber collector material, glass thickness, air gap distance, thermal cell absorber thickness, and flat plate absorber base collector thickness on the performance of solar thermal collectors was conducted in this work. The experiment was performed using the solar simulator with solar radiation of 450 and 750 W/m2. The flat plate absorber collector materials used in this experiment were stainless steel 304 and aluminum. The glass thickness used in this experiment was 2.0, 3.0, 4.0, 5.0, and 10.0 mm. The air gap between the flat plate absorber and glass used in this experiment was 0, 5.0, 10.0, 20.0, and 30.0 mm. The stainless steel thermal cell absorber thickness applied in this experiment was 0.5, 1.0, and 2.0 mm. Meanwhile, the aluminum flat plate base absorber base collector thickness was 0.5, 0.8, and 1.0 mm. The results showed that the 2.0 mm glass thickness has the maximum flat plate absorber temperature (88.1 oC at t = 600 s), high heat gain rate (0.097 oC/s), and the highest total heat gain (1207.33 J). The results also revealed that the air gap distance of 10 mm achieved the maximum flat plate absorber temperature (64.6 oC at t = 600 s), the highest heat gain rate (0.058 oC/s), and the highest total heat gain (4750.92 J). The stainless steel thermal cell absorber thickness of 1.0 mm has the thermal cell absorber temperature of 76.2 oC at t = 600 s and a high heat gain rate at 0.08 oC/s. The aluminum flat plate base absorber achieved the highest flat plate absorber temperature (67.2 oC at t = 600 s) and the highest heat gain rate (0.062 oC/s). By using double glass as glass cover increase the flat plate absorber temperature (76.3 oC at t = 600 s) and the highest heat gain rate (0.077 oC/s). This research aims to produce a flat plate absorber with better energy storage, i.e., the performance of the stainless steel plate absorber is better than aluminum with the same thickness. Although the stainless steel flat plate absorber collector showed a lower temperature than aluminum, it has a higher temperature drop than the latter.

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Meena, Chandan Swaroop, Sunita Meena, and V. K. Bajpai. "Correlation between Absorber Plate Thickness δ and Collector Efficiency Factor Fˈ of Solar Flat-Plate Collector." Applied Mechanics and Materials 592-594 (July 2014): 2341–44. http://dx.doi.org/10.4028/www.scientific.net/amm.592-594.2341.

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Solar collectors are the key component of active solar-heating systems. They collect the sun's energy, transform its radiation into heat, and then transfer that heat to a fluid. The solar thermal energy can be used in solar water-heating systems, solar pool heaters, and solar space-heating systems. The configuration of the Flat Plate Collector (FPC) is very important parameter which affects collector performance. The collector efficiency factor is directly affecting the efficiency of the solar flat-plate collector, this collector efficiency factor influenced with few other parameters, i.e. the center to center distance of absorber tubes W and thickness of absorber plate δ and heat loss coefficient UL. This paper focuses on the relation between δ with the collector efficiency factor of serpentine tube solar flat-plate collector. This study shows that if we increase the δ then Fˈ increases.

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Kearney, Meghan, Jane Davidson, and Susan Mantell. "Polymeric Absorbers for Flat-Plate Collectors: Can Venting Provide Adequate Overheat Protection?" Journal of Solar Energy Engineering 127, no. 3 (November 1, 2004): 421–24. http://dx.doi.org/10.1115/1.1979518.

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Venting and evaporative cooling are modeled as possible techniques for protecting polymer absorbers in single-glazed, flat-plate solar collectors from exceeding the material temperature limit during dry stagnation. Four venting options are considered: (I) venting above the absorber plate, (II) venting below, (III) dual venting, and (IV) venting with evaporative cooling. Results indicate that in hot, sunny conditions, venting may not provide adequate cooling to lower the absorber temperature to the relative thermal index of the polymeric materials currently in use or under consideration for this application. Venting combined with evaporative cooling from a wetted pad directly beneath the absorber plate is identified as a potential method of overheat protection in hot, dry climates.

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Anggara, Mietra, and Silvia Firda Utami. "PENGARUH VARIASI HEAT ABSORBER PLATE TERHADAP PERFORMANCE SOLAR DRYER KEMIRI." Jurnal TAMBORA 4, no. 1 (February 21, 2020): 14–20. http://dx.doi.org/10.36761/jt.v4i1.565.

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Indonesia one of the plants that leaves and seeds grow has many useful benefits for human life, namely candlenut. The post-harvest handling of candlenut at the farm level it is generally still done traditionally where candlenut is drying on the floor or by direct exposure to solar radiation. They need approximately 7-9 days to get the appropriate drying results. Candlenut drying is influenced by the intensity of solar radiation on temperature and drying time according to the required hazelnut content. the dry hazelnut can use solar radiation power that is solar dryer. Absorbent plate is one component that is very important because it functions to absorb the intensity of solar radiation and convert it into heat energy and move it to the workpiece (candlenut) above it. In this study, testing was done on variations of the absorbent plates of zinc, aluminum and iron as well as variations in the thickness of the absorbent plates. Data collection starts at 09:00 until 15:00 WITA in sunny weather conditions. The results showed that the aluminum absorbent plate with a thickness of 0.04 mm was more effective and efficient in drying the candlenut to increase the productivity of the candlenut. The highest absorbent plate temperature and drying time were found on the aluminum absorbent plate with a thickness of 0.4 mm that is 72.36 oC and a drying time of 6 hours and meets the standard of moisture content of candlenut solution, which is 5.3%.

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Li, Chengyi, Qunwu Huang, and Yiping Wang. "Effect of Color Coating of Cover Plate on Thermal Behavior of Flat Plate Solar Collector." Energies 13, no. 24 (December 18, 2020): 6696. http://dx.doi.org/10.3390/en13246696.

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An important trend of Building Integrated Solar Thermal (BIST) system is to improve the aesthetic aspect of the solar collector to meet the requirement of architectural style and energy collection. Painting on the glass cover in an appropriate method is a simple and practical way. In this study, a halftone coating was used to print a red brick wall pattern on the glass cover. A series of comparative experiments were carried out to test the effect of the coating on the thermal behavior of the solar collector. In heat collection processes, compared with the solar collector with blank cover plate, the one with coated cover plate has lower absorber plate temperature and higher cover plate temperature. The lower the solar irradiance, the smaller the effect of color coating on the solar collector. Compared with the uncoated surface, the coated surface is more sensitive to solar irradiation. In the same heat collection process, compared with the solar collector coated on the outer surface of the cover plate, the one coated on the inner surface has 0.8 °C higher heat absorber plate temperature and 5% lower top heat loss.

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Zhu, Yanqing, Jifu Shi, Qizhang Huang, Yueyun Fang, Leilei Wang, and Gang Xu. "A superhydrophobic solar selective absorber used in a flat plate solar collector." RSC Advances 7, no. 54 (2017): 34125–30. http://dx.doi.org/10.1039/c7ra04238h.

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Meena, Sunita, Chandan Swaroop Meena, and V. K. Bajpai. "Relation between Collector Efficiency Factor and the Centre to Centre Distance of Absorber Tubes of Solar Flat-Plate Collector." Applied Mechanics and Materials 592-594 (July 2014): 2404–8. http://dx.doi.org/10.4028/www.scientific.net/amm.592-594.2404.

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Solar energy collectors are a special kind of heat exchangers that transform solar radiation energy to internal energy of the transport medium. The major component of any solar system is the solar collector. This is a device which absorbs the incoming solar radiation, converts it into heat, and transfers this heat to a fluid (usually air, water, or oil) flowing through the collector. The measurement of the flat plate collector performance is the collector efficiency. The collector efficiency is the ratio of the useful energy gain to the incident solar energy over a particular period of time. The useful energy gain is strongly depends on the collector efficiency factor and this factor directly influenced by few parameters i.e. the centre to centre distance of absorber tubes W , thickness of absorber plate δ and heat loss coefficient UL. This paper has been focused on the relation between W with collector efficiency factor of serpentine tube solar flat-plate collector. This study shows that if we increase the W then Fˈ decreases.

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Hossain, Shouquat, Ali Wadi Abbas, Jeyraj Selvaraj, Ferdous Ahmed, and Nasrudin Bin Abd Rahim. "Experiment of a Flat Plate Solar Water Heater Collector with Modified Design and Thermal Performance Analysis." Applied Mechanics and Materials 624 (August 2014): 332–38. http://dx.doi.org/10.4028/www.scientific.net/amm.624.332.

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An investigation is reported of the thermal performance of a flat plate solar water heater with a circulating absorber pipe surface. The thermal performance of the 2-side parallel serpentine flow solar water heater depends significantly on the heat transfer rate between the absorber surface and the water, and on the amount of solar radiation incident on the absorber surface. The modified pipe arrangement has a higher characteristic length for convective heat transfer from the absorber to the water, in addition to having more surface area exposed to solar radiation. It means during the operation of water heater, more solar energy is converted into useful heat. However, this modification has reduced the efficiency of the system marginally.

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Maheshwari, B. K., Rajendra Karwa, and S. K. Gharai. "Performance Study of Solar Air Heater Having Absorber Plate with Half-Perforated Baffles." ISRN Renewable Energy 2011 (October 19, 2011): 1–13. http://dx.doi.org/10.5402/2011/634025.

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The paper presents a detailed mathematical model for performance prediction of a smooth duct solar air heater validated against the experimental results. Experimental study on a solar air heater having absorber plate with half-perforated baffles on the air flow side shows thermal efficiency enhancement of 28%–45% over that of the smooth duct solar air heater, which is attributed to the heat transfer enhancement (of the order of 180%–235%) due to the perforated baffles attached to the absorber plate and reduction in the mean temperature of the absorber plate by 20°C–25°C as compared to the temperature of absorber plate of smooth duct air heater. Using the mathematical model, the performance plot for the baffled duct air heater has been presented, and the effect of the variation of ambient parameters on the predicted thermal efficiency has been studied.

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Diana, Lohdy, Arrad Ghani Safitra, Muhammad Syarifuddin Firmansyah, and Mishbaakhus Prana Zinedine. "Experimental Study of Artificial Solar Air Heater Using Trapezoidal Wave Plate." R.E.M. (Rekayasa Energi Manufaktur) Jurnal 4, no. 2 (December 30, 2019): 135–48. http://dx.doi.org/10.21070/r.e.m.v4i2.806.

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A solar air heater is needed for the drying process, especially in Indonesia. It means the researches to produce a solar air heater that had high performance is necessary. This research analyses the performance of solar air heater using trapezoidal absorber plate with variation of folded angle 83˚, 85˚, and 87˚. The research carry out artificial experimentally using halogen lamp as a solar simulator. The working principle of solar air heating begins with an induction fan sucking air to enter through the honeycomb then flowing into the air heating duct. The process of heat transfer occurs in a halogen heat lamp passed by the transparent glass and then absorbed by the absorbent plate. This heat will heat the air flowing in the air heating pipe to be transmitted into the drying cupboard. The experiment used several variations of the mass airflow rate 0.022 until 0.051 kg/s and intensity 850, 900, dan 950 W/m2. Temperature measurement is carried out by installing a thermocouple at several points that have been determined. The best performance produced by the wave plate-shaped trapezoidal wave heaters 83˚ when I = 950 W/m2 air mass flow rate 0.022 kg/s with the temperature of the absorbent plate 87 ˚C, the temperature of the exit air 43.2 ˚C, the difference in the rise in air temperature 15.2 ˚C, and when I = 950 W/m2 air mass flow rate 0.051 kg/s the useful heat generated by the air heater 527 Watt, and thermal efficiency 96.8%.

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Singh, Vivek, Ajay Singh, and Ashish Verma. "A Review on Experimental Analysis of Double Pass Solar Air Heater With Baffled Absorber Plate." International Journal of Trend in Scientific Research and Development Volume-1, Issue-6 (October 31, 2017): 496–500. http://dx.doi.org/10.31142/ijtsrd3556.

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Patel, Vivek B., and Sailesh N. Chaudhary. "Thermal Analysis on Solar Air Heater with Corrugated Absorber Plate and Amul Cool Aluminum Cans." Indian Journal of Applied Research 3, no. 6 (October 1, 2011): 209–12. http://dx.doi.org/10.15373/2249555x/june2013/69.

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Pirzada, Luqman Ahmed, Xiaoli Wu ., Qaiser Ali, and Asif Khateeb . "Investigation of Performance of Solar Flat and Curved Plate Collectors through Numerical Simulations." January 2021 40, no. 1 (January 1, 2021): 66–74. http://dx.doi.org/10.22581/muet1982.2101.06.

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Solar energy is radiant light as a form of thermal heat energy which can be obtained and used by means of a variety of solar apparatus. As apparatus the flat and curved plate solar collector is specifically designed for assembling solar energy as a solar water heater system. The designing potency of this collector lone can generate medium level hot water from radiant sunlight source via absorbed plates. Standard type flat and curved plates solar collector plates are mostly used in remote coldest regions of the world where hot water is consumed for commercial and domestic purposes. These types of solar collector Plates can cheaply be manufactured compared to other solar panels like solar Shingles, Polycrystalline Solar Panels, Mono-crystalline Solar Panels, and Thin Film Solar Panels. For future work, this proposed pre-design is recommended for fabrication. A numerical study was carried-out on eight city locations in China by tracing their horizontal and vertical longitudinal, latitudinal lines noting the date, time and sunlight feeding of temperatures in the Celsius scale with the help of simulation and modeling tools like CFD, ANSYS FLUENT software, mesh geometry tools, and by using the Navier-Stokes and Continuity equations by fluid flow discharge rate, mass flow, water temperature and dropping of temperature, radiation working mechanisms, dimensions of water flowing tubes and absorber plates, density, the velocity of water as the working fluid, the viscosity of water in a cold and hot state as a process of Pre-design. Work also focuses on the comparison between flat plate collector and curved plate collector radiant sunlight absorption, As end result it is found the Curved plate collector produces 22% more elevated heat of outgoing water than flat plate collector.

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Agboola, Phillips, and Fuat Egelioglu. "Empirical investigation of two designs of incline solar water desalination system." Polish Journal of Chemical Technology 14, no. 1 (January 1, 2012): 35–40. http://dx.doi.org/10.2478/v10026-012-0056-7.

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Empirical investigation of two designs of incline solar water desalination system This paper presents an experimental investigation of two incline solar water desalination (ISWD) systems. One design uses spray jets for spraying water onto the absorber plate, while the other uses a longitudinal slot for getting the inlet water on the absorber plate. The first ever ISWD system constructed and tested by Aybar et al (2005) used the longitudinal slot with a maximum daily production of 2.995 kg/m2 day. The Aybar et al design produced 3.4 kg/m2-day while the new design produced 6.41 kg/m2-day for wick on absorber plate system day during the hottest months in Famagusta (July-August 2010). Also tested was the influence of porous media (wire mesh), wick on the absorber plate. The effect of number of spray jets used in the system on the daily productivity and efficiency of the systems were also investigated.

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Eismann, Ralph, Sebastian Hummel, and Federico Giovannetti. "A Thermal-Hydraulic Model for the Stagnation of Solar Thermal Systems with Flat-Plate Collector Arrays." Energies 14, no. 3 (January 30, 2021): 733. http://dx.doi.org/10.3390/en14030733.

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Stagnation is the transient state of a solar thermal system under high solar irradiation where the useful solar gain is zero. Both flat-plate collectors with selective absorber coatings and vacuum-tube collectors exhibit stagnation temperatures far above the saturation temperature of the glycol-based heat carriers within the range of typical system pressures. Therefore, stagnation is always associated with vaporization and propagation of vapor into the pipes of the solar circuit. It is therefore essential to design the system in such a way that vapor never reaches components that cannot withstand high temperatures. In this article, a thermal-hydraulic model based on the integral form of a two-phase mixture model and a drift-flux correlation is presented. The model is applicable to solar thermal flat-plate collectors with meander-shaped absorber tubes and selective absorber coatings. Experimental data from stagnation experiments on two systems, which are identical except for the optical properties of the absorber coating, allowed comparison with simulations carried out under the same boundary conditions. The absorber of one system features a conventional highly selective coating, while the absorber of the other system features a thermochromic coating, which exhibits a significantly lower stagnation temperature. Comparison of simulation results and experimental data shows good conformity. This model is implemented into an open-source software tool called THD for the thermal-hydraulic dimensioning of solar systems. The latest version of THD, updated by the results of this article, enables planners to achieve cost-optimal design of solar thermal systems and to ensure failsafe operation by predicting the steam range under the initial and boundary conditions of worst-case scenarios.

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Ho, Chii-Dong, Hsuan Chang, Ching-Fang Hsiao, and Yu-Chen Lin. "Optimizing Thermal Efficiencies of Double-Pass Cross-Corrugated Solar Air Heaters on Various Configurations with External Recycling." Energies 14, no. 13 (July 3, 2021): 4019. http://dx.doi.org/10.3390/en14134019.

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The effect of external-recycle operations on the thermal performance of double-pass cross-corrugated solar air heaters (SAH) under different operating conditions was investigated experimentally and theoretically. Additionally, the simultaneous ordinary equations were solved analytically for each proposed configuration. Four recycling types are introduced for improving the solar thermal performance with different external recycle processes, which are expected to enhance the heat transfer coefficient with a convective turbulent flow between the air and the absorber in the present study. Using recycling double-pass operations, two processes were conducted sequentially: air first flowed over the sinusoidal corrugated absorber plate and then flowed back later over the transverse sinusoidal corrugated bottom plate. Improved device performance was achieved due to the doubled heat transfer area over and under the corrugated absorber plate, from which both the sinusoidal cross-corrugated absorber plate and bottom plate enhanced turbulent intensity. Theoretical predictions and experimental results both indicated that the recycle ratio increased with the SAH thermal efficiency for all proposed designs. The results show a higher heat transfer efficiency for the proposed four configurations using wavelike corrugated plates compared to those conducted in single-pass and flat-plate absorber plates with up to a maximum 133% (from 0.301 to 0.703) increment. The optimal device performance was examined for all external-recycle configurations under the same working dimensions and operational conditions. The best configuration for optimal thermal performance was the device that lengthened the air flow pathway and increased the air velocity within the collector; thus, a higher heat transfer rate was accomplished. The evaluation of increments in the power consumption and of the heat-transfer efficiency enhancement together determined the optimal design based on an economic consideration across various configurations of cross-corrugated double-pass devices.

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Oyinlola, MA, and GSF Shire. "Characterising micro-channel absorber plates for building integrated solar thermal collectors." Building Services Engineering Research and Technology 40, no. 1 (June 12, 2018): 13–29. http://dx.doi.org/10.1177/0143624418783173.

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This paper discusses the characterisation of micro-channel absorber plates for compact flat plate solar thermal collectors, which are suitable for building integration. Experimental and computational studies were carried out at typical operating conditions for flat plate solar collectors. Three-dimensional numerical analysis using commercial CFD package, ANSYS CFX, showed that heat transfer occurred on only three surfaces of the channel and there was a peripheral variation of the heat flux density. It was also observed that axial thermal conduction could modify the surface boundary at the inlet and outlet; however, the middle section of the channel could be approximated as a rectangular channel with three walls transferring heat under an H1 boundary condition. Experimental studies were used to estimate the standard parameters for predicting performance of the flat plate collectors, which indicated promising performance results. The collector flow factor F″ and the heat removal factor could be improved by increasing the collector capacitance rate; this can be achieved by increasing the mass flow rate per collector area [Formula: see text] as well as reducing the overall heat loss, UL. This analysis is important for optimising design and operating parameters, especially to minimise temperature gradient in the transverse and longitudinal directions. Practical application: The proposed compact micro-channel absorber plate has the potential to make flat plate collectors more efficient, cheaper and aesthetically attractive in building integration. It could therefore promote the uptake of solar thermal collectors in buildings. The analysis presented in this study would be beneficial for optimising the design and operating parameters of building integrated solar thermal collectors with micro-channels.

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Hamood, Bashaar Abdulkareem, and Mohammed ABDUL RAOUF NIMA. "Experimental Investigation of Thermal Performance of a Solar Chimney Provided with a Porous Absorber Plate." Journal of Engineering 26, no. 4 (March 23, 2020): 1–20. http://dx.doi.org/10.31026/j.eng.2020.04.01.

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Experimental investigation of the influence of inserting the metal foam to the solar chimney to induce natural ventilation are described and analyzed in this work. To carry out the experimental test, two identical solar chimneys (without insertion of metal foam and with insertion of metal foam) are designed and placed facing south with dimensions of length× width× air gap (2 m× 1 m× 0.2 m). Four incline angles are tested (20o,30o,45o,60o) for each chimney in Baghdad climate condition (33.3o latitude, 44.4o longitude) on October, November, December 2018. The solar chimney performance is investigated by experimentally recording absorber plate and air temperatures and velocity of air. Results indicated that the using metal foam absorber plate lead to reducing the mean temperature of absorber plate by 6.7 °C as a result, the values of chimney outlet air temperature increased. The daily solar chimney efficiency enhanced by 58.7% and the useful energy received also increased. The existence of metal foam caused higher air velocity at the exit and increasing in the ventilation rate that the maximum ventilate rate obtained from the solar chimney is 5.96 1/hr for 27 m3 volume of room at solar irradiance of 730 W/m2 for chimney incline angle of 60o. The results of the experimental work show that the addition of metal foam to the solar chimney as an absorber plate is an efficient method to enhance the characteristics of heat transfer and the thermal performance of the solar chimney in the weather condition of Iraq.

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Jagadeesh, Duraisamy, Ramasamy Venkatachalam, and Gurusamy Nallakumarasamy. "Transient computational fluid dynamics investigations on thermal performance of solar air heater with hollow vertical fins." Thermal Science 22, no. 6 Part A (2018): 2389–99. http://dx.doi.org/10.2298/tsci170531297d.

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Evaluation of experimental thermal performance of a single pass solar air dryer is compared with a transient CFD studies is performed. Vertical hollow plates are placed below the absorber plate and compared against the flat solar absorber plate for its performance improvement. Effect of mass-flow rate, the outlet temperature of air is computationally analyzed in comparison with the experimental work, transient boundary conditions for CFD like ambient temperature, solar insolation are taken from the experimental work, and computational results are in good agreement of with experimental results with maximum error percentage of 10%. Thermal efficiency was increased with increase in mass-flow area for without fin configuration, for a specific mass-flow rate thermal efficiency had a good improvement with fin configuration than the without fin configuration.

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Desisa, Debela Geneti. "Mathematical Modelling and Performance Analysis of Flat Plate Solar Dryer- CFD Simulation Approach." Turkish Journal of Agriculture - Food Science and Technology 9, no. 1 (January 23, 2021): 172–80. http://dx.doi.org/10.24925/turjaf.v9i1.172-180.3786.

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This study focuses on the investigation of enhancing convective heat transfer between the absorber and the air inside a channel. The investigation approaches modeling different absorber through CFD simulation and validating the result with experimental data. Supplying air to both sides of the top and the bottom surfaces of the absorber increase the air mass flow rate and therefore increases the thermal efficiency of the dryer. The studies in a V-grooved absorber attain high hot air velocity; high thermal efficiency resulted from high turbulence created in the duct. For the sample taken with a flow range, 0.01kg/s to 0.06 kg/s, the high output temperature was observed in a lower temperature range and increases as the flow rate increases. At a flow rate 0.01 kg/s, the velocity of hot air passing over the V-grooved absorber attain 0.28 m/s and increased to 1.4 m/s as the mass flow rate increased to 0.06 kg/s. For the rectangular absorber, the velocity of hot air attains 0.15 m/s at a flow rate of 0.01 kg/s and increased to 1.46 m/s as the mass flow rate increases to 0.06 kg/s. The double-sided V-grooved absorber contributes 8 – 12.40% value more efficiency compared to the rectangular plate with the same flow orientation. Further investigation is recommended taking the quantitative analysis obtained in this study and generating qualitative data.

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Kant, Chander, Prashant Kumar, Ankur Gill, and Dhiraj Parkash Dhiman. "Thermal Performance of Three Sided Artificially Roughened Double Duct Parallel Flow Solar Air Heater." Asian Journal of Engineering and Applied Technology 7, no. 1 (May 5, 2018): 5–15. http://dx.doi.org/10.51983/ajeat-2018.7.1.976.

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A solar air heater is basically a heat exchanger, which intercepts the incident solar radiation, converts it into heat and finally transfers this heat to a working fluid for an end use system. The mode of air flowing in the ducts of a solar air heater is one of the most significant aspects concerned with solar air heater which dominantly affect. A double duct parallel flow artificially roughened solar air heater with three sides of the absorber plate is investigated in the current study. Unlike the conventional model of solar air heater with only one sided roughened absorber plate, a novel solar air heater with three artificially roughened absorber plate is used so that the surface area of the absorber plate is increased which ultimately increases the rate of heat transfer. Additionally, a double duct parallel flow arrangement through inner and outer duct of solar air heater is considered order to enhance the heat transfer rate. A numerical investigation of the heat transfer and friction factor characteristics of a double duct parallel flow three sided artificially roughened solar air heater has been carried out. A commercial finite volume CFD code ANSYS FLUENT is used to simulate turbulent air flow through artificial roughened solar air heater. Governing equations of the fluid flow and heat transfer i.e. Navier-Stokes equation and energy equation are solved with RNG k-ε turbulence model. Nine different configuration of square rib are studied with relative roughness pitch (P/e = 5-10) and relative roughness height (e/D = 0.03-0.06). The Reynold number of the flow is varied from 2500 to 16000.

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Hernández-Pérez, Carlos David, Enrique Barrera-Calva, Federico González, and Victor Rentería Tapia. "Ultrasonic spray pyrolysis technique to generate a solar absorber coating of Mn-doped α-Fe2O3." Renewable Energy and Environmental Sustainability 6 (2021): 3. http://dx.doi.org/10.1051/rees/2021003.

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Today, even though exist a Titanium Nitride Oxide, TiNOX, a very good commercial solar absorber, the efforts to develop new and better solar absorbers like TiNOX are continuing in several laboratories all over the world. In this article, we used the ultrasonic spray pyrolysis technique to prepare manganese, Mn, Mn-doped α-Fe2O3 dark thin films deposited on titanium substrates. The results of an analysis of the solar absorptance and thermal emittance of these films are also presented here; the optical properties depend of the proportions of Mn and iron, Fe, in the spray solution and of the deposit temperature. The best solar absorptance (0.94) and thermal emittance (0.07) values of the films prepared at 600 °C for iron and manganese ion with concentrations of 0.0015 and 0.0035 mol/l, respectively, are comparable with the optical properties of the Titanium Nitride oxide, TiNOX, a very common commercial solar absorber used as an efficient coating for flat plate solar collectors industry.

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Oyinlola, M. A., G. S. F. Shire, and R. W. Moss. "Thermal analysis of a solar collector absorber plate with microchannels." Experimental Thermal and Fluid Science 67 (October 2015): 102–9. http://dx.doi.org/10.1016/j.expthermflusci.2014.10.014.

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Bakic, Vukman, Goran Zivkovic, and Milada Pezo. "Numerical simulation of the air flow around the arrays of solar collectors." Thermal Science 15, no. 2 (2011): 457–65. http://dx.doi.org/10.2298/tsci110222051b.

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This paper deals with the numerical simulation of air around the arrays of flat plate collectors and determination of the flow field, which should provide a basis for estimating a convective heat losses, a parameter which influences their working characteristics. Heat losses are the result of the reflection on the glass, conductive losses at the collector?s absorber plate, radiation of the absorber plate and convective losses on the glass. Wind velocity in the vicinity of the absorber plate depends on its position in the arrays of collectors. Results obtained in the numerical simulation of flow around collectors were used as boundary conditions in modeling of thermal-hydraulic processes inside the solar collector. A method for coupling thermal-hydraulic processes inside the collector with heat transfer from plate to tube bundle was developed, in order to find out the distribution of the temperature of the absorber plate and the efficiency of the flat plate collectors. Analyses of flow around arrays of collectors are preformed with RNG k - ? model. Three values for free-stream velocity were analysed, i.e. 1 m/s, 5 m/s and 10 m/s, as well as two values for the angle between the ground and the collector (20? and 40?). Heat transfer coefficient was determined from the theory of boundary layer. Heat transfer inside the plate cavity was analyzed assuming constant intensity of radiation.

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Khademi, Maryam, Farzad Jafarkazemi, Emad Ahmadifard, and Saman Younesnejad. "Optimizing Exergy Efficiency of Flat Plate Solar Collectors Using SQP and Genetic Algorithm." Applied Mechanics and Materials 253-255 (December 2012): 760–65. http://dx.doi.org/10.4028/www.scientific.net/amm.253-255.760.

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An increase in exergy efficiency of flat plate solar collector leads to a considerable improvement in collector’s performance. Different parameters influence the performance of collector. In this paper, Sequential Quadratic Programming (SQP) and Genetic Algorithm (GA) have been employed for optimizing exergy efficiency of the flat plate solar collector. Absorber plate area and mass flow rate of inlet water have been considered as optimization’s variables. The results show the possibility to reach higher exergy efficiency with lower absorber area and consequently lower price. Also it is obvious that SQP method performs optimization process with higher convergence speed but lower accuracy than GA.

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Handoyo, Ekadewi A., Djatmiko Ichsani, Prabowo, and S. Sutardi. "Experimental Studies on a Solar Air Heater Having V-Corrugated Absorber Plate with Obstacles Bent Vertically." Applied Mechanics and Materials 493 (January 2014): 86–92. http://dx.doi.org/10.4028/www.scientific.net/amm.493.86.

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A solar air heater (SAH) is a simple heater using solar radiation that is useful for drying or space heating. Unfortunately, heat transfer from the absorber plate to the air inside the solar air heater is low. Some researchers reported that obstacles are able to improve the heat transfer in a flat plate solar air collector and others found that a v-corrugated absorber plate gives better heat transfer than a flat plate. Yet, no work of combining these two findings is found.This paper describes the result of experimental study on a SAH with v-corrugated absorber plate and obstacles bent vertically started from 80oto 0owith interval 10oon its bottom plate. Experiments were conducted indoor at five different Reynolds numbers (1447 Re 7237) and three different radiation intensities (430, 573, and 716 W/m2).It is found that the obstacles improve SAH performance. Both the air temperature rise and efficiency increase with inserting obstacles bent at any angle vertically. Unfortunately, the air pressure drop is increasing, too. Obstacles bent vertically at smaller angle (means more straight) give higher air temperature rise and efficiency. However, the optimum angle is found 30o. The air temperature rise and efficiency will be 5.3% lower when the obstacles bent 30oinstead of 0o, but the pressure drop will be 17.2% lower.

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Chhaparwal, Gaurav Kumar, Ankur Srivastava, and Ram Dayal. "Numerical study of an asymmetrically heated rectangular duct with suspended cylinders." MATEC Web of Conferences 240 (2018): 04002. http://dx.doi.org/10.1051/matecconf/201824004002.

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An asymmetrically heated (only one side of the duct is heated) solar air heater duct is numerically investigated using openFOAM to study the effect of passive turbulators (suspended cylinders) installed within the boundary layer close to the absorber plate to enhance heat transfer from it. Vortex flow is created behind the suspended cylinders, which disturbs the boundary layer and causes mixing of hot stream lines near the surface with relatively cold stream away from the absorber plate. Diameter of the suspended cylinders and its distance from the absorber plate is varied to study its effect on wall temperature of absorber plate in the turbulent flow regime.

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Meena, Chandan Swaroop, Binju P. Raj, Lohit Saini, Nehul Agarwal, and Aritra Ghosh. "Performance Optimization of Solar-Assisted Heat Pump System for Water Heating Applications." Energies 14, no. 12 (June 14, 2021): 3534. http://dx.doi.org/10.3390/en14123534.

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The use of solar energy in water heating applications, such as in solar-assisted heat pump systems, has great benefits, such as reductions in heat transfer losses, control over incident solar heat, and generation of environmentally benign water heat. In the present study, we performed parametric optimization based on an experimental model of a solar-assisted heat pump system for water heating (SAHPSWH) in the context of colder climatic regions receiving minimal solar radiation. Various parameters were investigated, such as the different glazing arrangements, the distances between fluid-circulating tubes, and the absorber sheet arrangement. The results showed that double glazing was more efficient than single glazing, with average COP values of 3.37 and 2.69, respectively, and with similar heat gain rates. When the evaporator tube was soldered below the absorber plate, the COP was 1.19 times greater than when the tube was soldered above the absorber plate. We also analyzed whether the collector efficiency factor F′ has an inverse relationship with the tube distance and a direct relationship with the absorber plate thickness. Through this experimental study, we verified that the SAHPSWH is reliable if designed judiciously. This promising energy-saving system is particularly suitable for areas abundant in solar radiation, such as in India, where the needs for space conditioning and water heating are constant.

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Lari, Khosro, Ali Tarokh, and Mohammad Naghizadeh. "Gas radiative effects on gas-filled flat plate solar collectors." Canadian Journal of Physics 97, no. 10 (October 2019): 1115–24. http://dx.doi.org/10.1139/cjp-2018-0878.

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A standard thermal solar collector can be used for both hot water production and air heating purposes. Gas-filled solar collectors represent a new emerging design approach with enhanced characteristics. In this research, numerical modeling is utilized to study radiative effects of the participating gases on the performance of solar collectors. The coupled radiative–convective heat transfer in the solar collector is considered and the collector cavity is considered as a radiatively participating medium. The finite volume method has been adopted to solve the governing equations and discrete ordinates method is used for radiative transfer. After validating the model used in this study, it is used to obtain the heat transfer characteristics of a flat-plate solar collector with real solar conditions of the city of Kerman, Iran, in summer at a wide range of air absorption coefficients. According to the results, by increasing the absorption coefficient of the air, the temperature of the absorber plate is reduced and the air temperature is increased, but the increase of air temperature is much higher than the reduction of absorber temperature. Hence, it is concluded that it is possible to use participating gases in the solar air heaters to enhance the performance of the collector.

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Wessley, G. Jims John, and P. Koshy Mathews. "Experimental Analysis of a Flat Plate Solar Collector System for Small-Scale Desalination Applications." Advanced Materials Research 984-985 (July 2014): 800–806. http://dx.doi.org/10.4028/www.scientific.net/amr.984-985.800.

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This paper presents the results of the experimental investigation on a solar flat plate collector carried out at Coimbatore, India (11°N Latitude and 74°E Longitude). The collector tubes allowed the water to flow twice across the flat plate collector using a circulating pump during which the water gets heated by the solar radiation received by the absorber. The maximum temperature of water obtained on a typical day in the month of April was 64°C with a solar radiation of 932.2651 W/m2. The available solar radiation strongly influences the temperature gain of the system while the wind velocity plays a considerable role in influencing the heat lost by the system. It is observed that the two-pass flow of water across the absorber plate results in a maximum temperature gain with an overall collector efficiency of 43.7 %. This solar water heating system using flat plate collector can be used for small-scale desalination applications.

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Cao, Rui Bing, Ya Ping Chen, and Jia Feng Wu. "Simulation of Vapor Absorption of Aqueous Libr Solution on Alternate Heat and Mass Transfer Surfaces of Corrugated Plates and Mesh Pecking." Advanced Materials Research 989-994 (July 2014): 831–36. http://dx.doi.org/10.4028/www.scientific.net/amr.989-994.831.

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The traditional tube-shell absorber is relatively too bulky to be used in a small absorption chiller for solar air conditioning. As the outer-surface of solution film on the traditional absorber surface is easier to be saturated, several alternate heat and mass transfer absorber schemes have been proposed. However, the film-inversion absorber uses only half surfaces while the dual-side film-inversion absorber scheme is of good performance but too complicated to fulfill. The scheme using stainless steel mesh packing as the film guider is much easier and more uniform in distributing film, and it can also act as the framework for exposing dual-side film to the vapor for adiabatic mass transfer. The alternate heat and mass transfer configurations with plate surfaces and mesh packing are of promising performance for small chiller absorbers.

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Karwa, Rajendra, and Shweta Baghel. "Effect of Parametric Uncertainties, Variations, and Tolerances on Thermohydraulic Performance of Flat Plate Solar Air Heater." Journal of Solar Energy 2014 (September 21, 2014): 1–18. http://dx.doi.org/10.1155/2014/194764.

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The paper presents results of an analysis carried out using a mathematical model to find the effect of the uncertainties, variations, and tolerances in design and ambient parameters on the thermohydraulic performance of flat plate solar air heater. Analysis shows that, for the range of flow rates considered, a duct height of 10 mm is preferred from the thermohydraulic consideration. The thermal efficiency changes by about 2.6% on variation in the wind heat transfer coefficient, ±5 K variation in sky temperature affects the efficiency by about ±1.3%, and solar insolation variation from 500 to 1000 Wm−2 affects the efficiency by about −1.5 to 1.3% at the lowest flow rate of 0.01 kgs−1 m−2 of the absorber plate with black paint. In general, these effects reduce with increase in flow rate and are lower for collector with selective coating on the absorber plate surface. The tolerances in the duct height and absorber plate emissivity should be small while positive tolerance of 3° in the collector slope for winter operation and ±3° for year round operation, and a positive tolerance for the gap between the absorber plate and glass cover at nominal value of 40 mm are recommended.

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Sahu, Kamlesh, and Gyaneshwar Sanodiya. "Enhanced Solar Air Heaters for Crop Drying." Indian Journal of Agriculture Engineering 1, no. 2 (November 10, 2021): 1–5. http://dx.doi.org/10.35940/ijae.b1506.111221.

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Solar air heaters are placed on farms to provide heat for the drying of grain and crop harvesting and harvesting. The results of the thermal study showed that solar air heaters are capable of providing a sufficient increase in air temperature under the majority of crop drying circumstances studied. The restricted thermal capacity of air, as well as the low heat transfer coefficient between the absorber plate and the air flow via the ducting system, both contribute to the overall thermal efficiency of solar air heaters. Solar air heaters must be more efficient in order to be more affordable. This may be accomplished by increasing the heat transfer coefficient between the absorber plate and the air flow passing through the duct. More heat transfer coefficients can be increased by using either active or passive approaches. In most situations, it may be cost-effective to use solar air heaters and incorporate artificial roughness on the absorber plate. The rate of heat transmission from the solar air heater's duct to the fluid flow may be increased by creating artificial roughness on the surface of the duct. The study focused on several roughness element geometries for solar air heater ducts, and the results indicated that there is a link between the two. This paper attempts to find ways to artificially increase the heat transfer capacity of solar air heaters' ducts by using element geometries which have been utilised in solar air heaters' heat transfer devices.

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Sah, Nandkishor, and Mohan Jagadeesh Kumar Mandapati. "Thermal performance of a double-pass solar air heater (SAH) with ribbed absorber surface – an experimental study." World Journal of Engineering 17, no. 3 (March 31, 2020): 373–80. http://dx.doi.org/10.1108/wje-08-2019-0217.

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Purpose Use of packed beds, enhanced tubes, nano-fluids and artificial ribs are few passive techniques to increase heat transfer in solar air heaters (SAHs). Artificial ribs attached to the absorber plate of the SAH will enhance the turbulence near the plate. Experimental analyses are conducted to find the thermal performance of SAH with ribs of regular geometries including rectangular, semi-circular and triangular in cross section. This paper aims to present the improvement in thermal performance of SAH with modified-arc. Design/methodology/approach Absorber plates are designed with ribs of rectangular, triangular, semi-circular and modified-arc in cross-section using existing data in literature. Physical dimensions of the ribs are designed by adapting procedure from literature. Absorber plates are manufactured with ribs and coated with blackboard paint and fixed to the existing SAH. Experiments are conducted with a variable-speed blower fixed to the inlet section of the SAH, which is used to supply air at different mass flow rates in a range between 0.495 and 0.557 kg/min. Findings Efficiency is found to be a strong function of mass flow rate of air through the SAH from the present experimental investigations. It was found that use of modified-arc ribs enhanced the efficiency of SAH by 105.35 per cent compared to SAH with plane absorber plate. Efficiency of SAH with modified-arc ribs is found to be higher by 24.43, 45.61 and 63.21 per cent, respectively, for SAH with semi-circular, rectangular and triangular arc ribs on its absorber plate. Research limitations/implications Experiments on SAH are conducted during daytime from 9:00 am to 5:00 pm in open atmospheric conditions. Solar intensity is continuously changing during the experimentation from morning to evening. Calculations are made based on the observations with average values of solar intensity and temperature readings. More accurate values of SAH efficiency can be obtained with constant heat supply to the absorber plate by simulating the experimental setup in indoor conditions. Temperature and flow rate observations could be more accurate with sophisticated instrumentation rather than using simple thermocouples and orifice meters. Social implications SAHs are basically used to supply hot air for both rural and industrial applications. These are used for crop drying, preheating of air, removal of moisture from leather, chemicals, etc. Conventionally, formers in India are using open sun drying to remove moisture from agricultural products. In this method, the moisture can be removed up to a level of 20 to 25 per cent. Use of SAH can remove moisture up to below 5 per cent and process is clean without reducing the quality of agricultural products. Enhancing the efficiency of SAHs will surely increase its usage by formers for crop drying. Originality/value Use of artificial ribs on absorber plate of SAH is most economical among many of the active and passive techniques. Numerical and experimental investigations are found in literature with regular cross-sectional ribs, including rectangular, triangular and semi-circular. The present work proposed new shape of the ribs named as modified-arc, which was not presented in the literature. Experimental analysis proved that the use of modified-arc makes the SAH more efficient in heat transfer.

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Chamoli, Sunil. "Exergy analysis of a flat plate solar collector." Journal of Energy in Southern Africa 24, no. 3 (August 1, 2013): 8–13. http://dx.doi.org/10.17159/2413-3051/2013/v24i3a3137.

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In this study, exergetic performance analysis of flat plate solar collector has been carried out analytically. A comprehensive mathematical modelling of thermal performance is simulated using MATLAB simulink and optimal geometrical and thermodynamic parameters are predicted pertaining to optimum performance of the system. The optimization procedure was applied to a typical collector and the optimum design points were extracted. The optimum values of collector inlet temperature, mass flow rate, absorber plate area, and fluid outlet temperature for maximum exergy inflow from the system have been obtained.

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Zomorodian, Ali, and Maryam Zamanian. "Designing and Evaluating an Innovative Solar Air Collector with Transpired Absorber and Cover." ISRN Renewable Energy 2012 (August 16, 2012): 1–5. http://dx.doi.org/10.5402/2012/282538.

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Applying solar collectors is a popular tool for harnessing solar energy. In this work, a flat plate solar air collector was investigated under direct solar radiation in an endeavor to enhance the thermal efficiency of solar air collector with a slatted glass cover, perforated absorber aluminum sheets (porosity 0.0177, 0.0314 and absorber thickness of 1.25, 2.5 mm) which is the most suitable for a solar dryer. The effects of porosity and thickness on absorber performance of collector were evaluated. Six levels of air mass flow rates (0.0056 to 0.0385 kg m−2 s−1) were adopted. The tests were conducted in three replications on very clear sky days in September and October. The experimental results showed that thermal efficiency of collector was increased by an increase in the porosity of the absorber. The absorber with lower porosity showed a better thermal efficiency at lower air mass flux. In the minimum air flow rate, absorber efficiency with porosity 0.0177 and 0.0314 was 0.31 and 0.29, respectively, whereas at the maximum flow, efficiency showed an enormous change of 0.83 and 0.88, respectively. This solar air heater can be used for drying agricultural products, heating the space of greenhouse, and so forth.

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Hans, V. S., R. S. Gill, and Sukhmeet Singh. "Thermohydraulic performance evaluation of solar air heater with roughened absorber plate." Agricultural Research Journal 52, no. 2 (2015): 172. http://dx.doi.org/10.5958/2395-146x.2015.00013.7.

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Badran, Ali A., Mohammed F. Mustafa, Walid K. Dawood, and Zaid K. Ghazzawi. "On the measurement of bond conductance in solar collector absorber plate." Energy Conversion and Management 49, no. 11 (November 2008): 3305–10. http://dx.doi.org/10.1016/j.enconman.2008.01.041.

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Amori, KE, and NS Jabouri. "Thermal Performance of Solar Hot Water Systems Using a Flat Plate Collector of Accelerated Risers." Journal of Engineering Research [TJER] 9, no. 1 (June 1, 2012): 1. http://dx.doi.org/10.24200/tjer.vol9iss1pp1-10.

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This study focuses on a comparison of the performance of two similar locally-fabricated solar water heaters. One of the collectors features a new design for accelerated absorber; its risers are made of converging ducts whose exit area is half that of the entrance. The other collector is a conventional absorber, with risers of the same cross sectional area along its length. Each collector is the primary part of an indirect thermosyphon circulation solar hot water system. Both collectors face south with a fixed tilt angle of 33.3

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Journal articles on the topic 'Plate solar absorber'

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