Relevant bibliographies by topics / Plate solar absorber

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers

Academic literature on the topic 'Plate solar absorber'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "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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Dissertations / Theses on the topic "Plate solar absorber"

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Leray, Cedric. "Etude du comportement thermique et thermomécanique des récepteurs solaires sous haut flux radiatif." Thesis, Perpignan, 2017. http://www.theses.fr/2017PERP0003/document.

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Dans le contexte énergétique qui se profile, la production d’électricité par voie solaire thermodynamique s’avère une solution prometteuse, que ce soit pour des considérations économiques, d’échelle de production ou environnementales. Une voie d’amélioration du rendement des centrales solaires à tour consiste à utiliser des cycles thermodynamiques à haut rendement type cycles combinés. Cela nécessite de pouvoir fournir un fluide de travail pressurisé à très haute température (10bar et 1000°C minimum). Ce manuscrit présente les travaux menés afin de développer et de viabiliser un concept d’absorbeur solaire surfacique modulaire en céramique (carbure de silicium) capable de répondre à ces exigences. Le choix du carbure de silicium s’est imposé pour sa résistance aux hautes températures et aux problèmes d’oxydation. Cependant, l’utilisation d’une céramique comme matériau implique un risque de casse des modules. Les céramiques sont en effet fragiles lorsqu’elles sont soumises à des contraintes de traction. C’est la connaissance et la maitrise de ce risque qui fait l’objet de cette étude. L’approche adoptée combine le développement d’outils numériques et d’études expérimentales réalisées sur le site de la centrale solaire Thémis (Targassonne, 66, France). La méthodologie desimulation développée permet de prédire le comportement thermique et le comportement mécanique de l’absorbeur. Ceci permet de réduire les risques encourus par l’absorbeur et d’en connaitre les performances. Cette méthodologie a été éprouvée à l’aide des résultats expérimentaux
For the future, using thermodynamical solar power plant seems to be a good solution to ensure electrical production. Solar tower plants are able to produce electricity in significant amount, are environmentally friendly and economically competitive. One way to increase the yield of these plants is using high efficiency thermodynamical cycles, like combined cycle. That requires to providing a working fluid at high temperature and high pressure (10bar and 1000°C at least). This PHD thesis presents the works performed to develop and enhance a concept of modular plate solar ceramic absorber that can ensure the required air production. We chose the silicon carbide as material due to its resistance to high temperatures and oxidation problems. The drawback is ceramic modules are weak to traction stresses. The study focuses on the knowledge and the control of this phenomenon. This work combines the developments of numerical tools and experimental studies performed at Thémis power plant (Targassonne, 66, FRANCE). The numerical method permits simulations to predict the thermal behavior and the mechanical behavior of a solar module absorber. It allows the reduction of the mechanical stresses undergone by solar receiver and the prediction of its performances. This methodology was tested using experimental results
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Oyinlola, Muyiwa Adeyinka. "Heat transfer in solar absorber plates with micro-channels." Thesis, University of Warwick, 2015. http://wrap.warwick.ac.uk/77388/.

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Analytical, computational and experimental studies were carried out to investigate heat transfer and fluid flow in micro-channel absorber plates for compact (thin and light-weight) solar thermal collectors. The main objective of the work was to study different design and/or operating scenarios as well as study the significance of various micro-scaling effects. Analytical investigation showed that, under similar conditions, the proposed design yields a much higher fin efficiency, F and collector efficiency factor, F’ compared with the conventional solar collector design. An analytical model combining convective heat transfer in the collector fluid with axial conduction in the metal plate was developed. The predicted plate temperature profiles from the analytical model were in close agreement with the measured profiles. The model further showed that axial thermal conduction can significantly alter the plate temperature profile. Experiments were designed to represent real life operation of the proposed system. A CFD study, using the same design and operating parameters, produced results comparable with experiments. This numerical simulation also gave further insight into the heat transfer and fluid flow patterns in the micro-channel plate. The effect of channel cross section geometry was studied. The Nusselt number was observed to increase as the aspect ratio approached unity. Measured friction factors were similar in trend to the predictions for rectangular channels, although the overall rise in fluid temperature resulted in slightly lower friction factors. Thermal performance reduced slightly with increase in hydraulic diameter. The significance of various scaling effects was also investigated experimentally and numerically. Most of the typical scaling effects such as viscous dissipation and entrance effects were found to be insignificant however, conjugate heat transfer, surface boundary condition, surface finish and measurement uncertainties could be significant. The results showed a Reynolds number dependent Nusselt number which has been attributed to axial thermal conduction. It was also observed that only three walls were transferring heat; the walls of heat transfer had a uniform peripheral temperature while the heat flux varied peripherally. The closest simplified thermal boundary condition to represent heat transfer in these channels is the H1 with three (3) walls transferring heat. Increased surface roughness (obtained by using an etching technique to create the channels) was found to have a detrimental effect on heat transfer. The results showed that thermal improvement can be achieved by increasing the fluid velocity; however, pumping the thermal fluid above a pump power per plate area of 0.3 W/m2 resulted in marginal improvement. In practice, optimum microchannel geometry in plates should be sized based on fluid properties and operating conditions. The micro-channels should also have thin walls to minimise the effects of conjugate heat transfer. A Photovoltaic pump should be installed alongside the collector in order to provide pumping power required and minimise the overall fluid temperature rise. The results are beneficial for the design of micro-channel absorber plates for low heat flux operation up to 1000W/m2.
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Book chapters on the topic "Plate solar absorber"

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Garg, H. P. "Absorber Plate Configuration and Optimization." In Solar Water Heating Systems, 93–111. Dordrecht: Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-009-5480-9_7.

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Badescu, Viorel. "Flat-Plate Solar Collectors. Optimization of Absorber Geometry." In Optimal Control in Thermal Engineering, 317–48. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-52968-4_15.

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Hamzah, Hudhaifa, Salim Ibrahim Hasan, and Serhan Küçüka. "Numerical Study of Thermal Transport in a Flat-Plate Solar Collector Using Novel Absorber Plate." In Environmentally-Benign Energy Solutions, 649–62. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-20637-6_32.

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Bhaisare, Aasawari, Unmesh Wasnik, Aniket Sakhare, Pawan Thakur, Akash Nimje, Abhishek Hiwarkar, Vikrant Katekar, and Sandip Deshmukh. "Performance Assessment of Improved Solar Still Design with Stepped-Corrugated Absorber Plate." In Intelligent Manufacturing and Energy Sustainability, 667–74. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-33-4443-3_64.

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Mahakud, Jayanarayan, and Balaram Kundu. "Simple Analytical Method for Performance of an Absorber Plate in Flat-Plate Solar Collectors for Two-Dimensional Heat Flow." In Lecture Notes in Mechanical Engineering, 1–12. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-6416-7_1.

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Jamil, Basharat, and Naiem Akhtar. "Effect of Gap Between Absorber Plate and Condenser Cover on the Performance of a Solar Still." In Energy, Transportation and Global Warming, 161–73. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-30127-3_14.

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Kumar, Dheeraj, Amit Kumar, and Apurba Layek. "Measurement of Temperature Distribution Using Liquid Crystal Thermography Technique Over the Absorber Plate of Solar Air Heater." In Lecture Notes in Mechanical Engineering, 335–43. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-33-4165-4_31.

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Mishra, Shri Krishna, Rahul Kumar, Renu Joshi, Hitesh Kumar, and Nishant Saxena. "Experimental Investigation, Exergy Analysis, and CFD Simulation of Solar Air Heater Roughened with Artificial V-Shaped Ribs on Absorber Surface Artificial Roughness on Absorber Plate." In Springer Proceedings in Energy, 235–52. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-0235-1_20.

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Thakur, Amrit Kumar, and V. P. Chandramohan. "Productivity Enhancement of Passive Type Solar Still Using Copper and Aluminum Based Absorber Plate with Al2O3 NanoFluid in Water Basin." In Advances in Energy Research, Vol. 2, 273–81. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-2662-6_26.

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Kanna, P. Rajesh, M. Chandrasekaran, and M. Ravikumar. "Experimental Investigation of Solar-Based Air Heater Rectangular Duct Having Uniform Spaced Dimple Shaped as Roughness Element on the Absorber Plate." In Springer Proceedings in Materials, 903–12. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-15-8319-3_90.

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Conference papers on the topic "Plate solar absorber"

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Kearney, Meghan, Jane H. Davidson, and Susan Mantell. "Polymeric Absorbers for Flat Plate Collectors: Can Venting Provide Adequate Overheat Protection?" In ASME 2005 International Solar Energy Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/isec2005-76005.

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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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Ekechukwu, O. V., Howard O. Njoku, and Gerald U. Akubue. "Measured Performances of an Augmented [Double-Exposure Absorber-Plate] Single-Slope Solar Still." In ISES Solar World Congress 2011. Freiburg, Germany: International Solar Energy Society, 2011. http://dx.doi.org/10.18086/swc.2011.05.02.

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Müller, Sebastian, Federico Giovannetti, Rolf Reineke-Koch, and Bernd Hafner. "Flat Plate Collectors with Thermochromic Absorber Coating Under Dynamic System Tests." In ISES Solar World Conference 2017 and the IEA SHC Solar Heating and Cooling Conference for Buildings and Industry 2017. Freiburg, Germany: International Solar Energy Society, 2017. http://dx.doi.org/10.18086/swc.2017.31.10.

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Wang, Yiping, Wei Tian, Yonghui Liu, Zhiyong Yang, Li Zhu, Jinli Zhang, and Bing Yuan. "System Modeling of Greenhouse Type Solar Water Heater." In ASME 2005 International Solar Energy Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/isec2005-76220.

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A Greenhouse type solar water heater has been built to evaluate the thermal performance of the new system and to extend the application field of thermosyphon solar heating system. The system consists of flat plate absorbers, greenhouse, water storage tanks and connection pipes. The greenhouse has dimensions of 34.6m in length and 9.2m in width. Ten cylindrical tanks of 0.5m in diameter and 1.5m in length and the flat plate absorbers with total area of 138m2 are connected in parallel. The roof and south wall of the greenhouse are made from polycarbonate which has high light transmission and low heat transmission and other walls are from Sandwiched color steel plates which are thermally insulated from the ambient environment. The water storage tanks, the flat plate absorbers and the connection pipes, which need no other insulation because of greenhouse effect, are placed in the greenhouse. The experimental data includes solar radiation, wind speed, ambient temperature, greenhouse air temperature, storage water temperature, and absorber temperature et al. To investigate new system performance, it is necessary to develop mathematical model which is different from models of traditional thermosyphon solar water heater because the new system combines natural circulation system and greenhouse technology. The transient thermal model of greenhouse type solar water heater is derived, which is based on energy balance of the flat plate absorbers, the floor, the air in the greenhouse, the roof, and the storage tank. Greenhouse air temperature and storage water temperature are predicted and mass flow rate is calculated according to the balance between the frictional pressure drop and pressure due to density differences around the thermosyphon circuit. It shows that the experimental data fit well with the estimated values according to the new mathematical models.
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Selvarasan, I., K. Balaji, S. Iniyana, and A. Idrish Khan. "Thermodynamic Analysis of a Solar Flat Plate Water Heater Using Extended Surface Absorber Tube." In ISES Solar World Congress 2015. Freiburg, Germany: International Solar Energy Society, 2016. http://dx.doi.org/10.18086/swc.2015.10.13.

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Ruiz, Maritza, and Van P. Carey. "An Exergy-Based Metric for Evaluating Solar Thermal Absorber Technologies for Gas Heating." In ASME/JSME 2011 8th Thermal Engineering Joint Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ajtec2011-44354.

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The energy conversion effectiveness of the central receiver absorber in concentrating solar thermal power systems is dictated primarily by heat losses, material temperature limits, and pumping power losses. To deliver concentrated solar energy to a gas for process heat applications or gas cycle power generation, there are a wide variety of compact heat exchanger finned surfaces that could be used to enhance the convective transfer of absorbed solar energy to the gas stream flowing through the absorber. In such circumstances, a key design objective for the absorber is to maximize the heat transfer thermodynamic performance while minimizing the pumping power necessary to drive the gas flow through the fin matrix. This paper explores the use of different performance metrics to quantify the combined heat transfer, thermodynamic and pressure loss effectiveness of enhanced fins surfaces used in solar thermal absorbers for gas heating. Previously defined heat exchanger performance metrics, such as the “goodness factor”, are considered, and we develop and explore the use of a new metric, the “loss factor”, for determining the preferred enhanced fin matrix surfaces for concentrated solar absorbers. The loss factor, defined as the normalized exergy loss in the receiver, can be used for nondimensional analysis of the desirable qualities in an optimized solar receiver design. In comparison to previous goodness factor methods, the loss factor metric has the advantage that it quantifies the trade-off between trying to maximize the solar exergy transferred to the gas (high heat transfer rate and delivery at high temperature) and minimizing the pumping exergy loss. In this study, the loss factor is used to compare current solar receiver designs, and designs that use a variety of available plate-finned compact heat transfer surfaces with known Colburn factor (j) and friction factor (f) characteristics. These examples demonstrate how the loss factor metric can be used to design and optimize novel solar central receiver systems, and they indicate fin matrix surfaces that are particularly attractive for this type of application.
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Kodama, Tatsuya, Nobuyuki Gokon, Shin-ichi Inuta, Shin-go Yamashita, Tsuyoshi Hatamachi, and Taebeom Seo. "Molten-Salt Tubular Absorber/Reformer (MoSTAR) Project: Metal-Plate-Bridged Double Tube Reactor." In ASME 2009 3rd International Conference on Energy Sustainability collocated with the Heat Transfer and InterPACK09 Conferences. ASMEDC, 2009. http://dx.doi.org/10.1115/es2009-90230.

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The Molten-Salt Tubular Absorber/Reformer (MoSTAR) Project, which is jointly conducted by Niigata University, Japan, and Inha University, Korea, aims to develop a novel-type of “double-walled” tubular absorbers/reformers with molten-salt thermal storage at high temperature for use in solar natural-gas reforming and solar air receiver, and to demonstrate their performances on sun with a 5-kWt dish-type solar concentrator. The new concept of “double-walled” reactor tubes was proposed for use in a solar reformer by Niigata University, Japan, and involves packing a molten salt in the annular region between the internal catalyst tube and the exterior solar absorber tube of the double reactor tube. In this work, “metal-plate-bridged” double reactor tubes are newly proposed for use in a solar reformer. Two different sized reactor tubes are constructed, and tested on chemical reaction performance for dry reforming of methane during cooling or heat-discharge mode of the reactor tube using an electric furnace. The experimental results obtained under feed gas mixture of CH4/CO2 = 1:3 at a residence time of 0.36 s and at 1 atm showed that the double reactor tube with the heat storage medium Na2CO3 in the annular region successfully sustained a high methane conversion above 90% with about 0.7-kW output power of the reformed gas based on HHV for 40 min of the heat-discharge mode. The application of the new reactor tubes to solar tubular reformers is expected to help realize stable operation of the solar reforming process under fluctuating insolation during a cloud passage.
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Bhore, V. R., and S. B. Thombre. "Performance Comparison of Flat Plate Collectors Fitted With Non Circular Risers With Integral Fins." In ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-82933.

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The present study deals with comparison of experimentally determined performance characteristics of solar flat plate collectors fitted with novel designs of absorber plate involving non-circular risers with integral fins and operating under natural circulation mode. The main flow passages considered were square, triangular and semicircular in cross section. One standard solar flat plate collector with circular risers was also tested simultaneously for direct comparison. The test results indicate that the absorber fitted with the triangular sectioned risers yields the best performance in terms of the efficiency (63%), and the buoyancy induced flow per unit area (76 kg/hr-m2) from amongst the collectors investigated. It is followed by the absorbers fitted with the semicircular and square sectioned risers respectively. The standard solar flat plate collector is found to yield the lowest values i.e. 46 % and 40 kg/hr-m2 respectively.
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Moaveni, Saeed, and Michael C. Watts. "Using a Windbreak to Improve the Thermal Performance of a Flat Plate Solar Collector: A Feasibility Study." In ASME 2011 5th International Conference on Energy Sustainability. ASMEDC, 2011. http://dx.doi.org/10.1115/es2011-54862.

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During the past few decades, a wide range of studies have been performed to improve the performance of flat plate solar collectors by either reducing the heat loss from a collector or by increasing the amount of solar radiation absorbed by the absorber plate. Examples of these studies include adding transparent honeycomb to fill the air gap between the glazing and absorber plate to reduce convective heat loss, replacing the air in the gap by other gases such as Argon, Krypton, Xenon and Carbon Dioxide, or adding a chemical coating such as Copper Oxide to increase absorbtance and reduce the emittance of the absorber plate. While these methods improve the collector’s efficiency, they focus primarily on limiting the natural convection that occurs in the collector cavity, or on improving the optical properties of the absorber or glazing. None of these studies have addressed the problem of heat loss due to forced convection to the surrounding ambient air in any detail. Yet, research has shown that forced convection will contribute significantly to the heat loss from a collector. Windbreaks have traditionally been used to direct wind to protect farmland, and to direct wind drifts and sand dunes. Windbreaks also have been shown to provide protection for homes from winter winds which result in reduced heating costs for buildings. While windbreaks have been traditionally used for large scale applications, there is reason to believe that similar benefits can be expected for scaled down applications such as adding a windbreak along side of a flat-plate solar collector. In this paper, we examine the feasibility of using a windbreak to provide a flat plate solar collector protection from the wind in order to improve its performance. A series of experiments were performed wherein the thermal performance of two flat-plate collectors — one without a windbreaker and one with a windbreaker — were measured. The results of these experiments are reported in this paper and the need for further studies to explore different windbreak configurations is discussed.
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10

Gawlik, Keith, and Jay Burch. "A Model of Radiation-Induced Thermal Stratification in an Integral-Collector-Storage Tank." In ASME 2003 International Solar Energy Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/isec2003-44211.

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A finite difference model was developed that predicts the transient temperature profile of the water in an integral collector-storage unit during charge from solar radiation incident on the absorber. The model uses a forward difference technique. A Nu(Gr*) correlation for a flat plate in an infinite medium under prescribed uniform heat flux was used on the inside surface of the absorber to relate imposed flux to boundary layer mass flow and temperature. Nodal mass-energy balances were imposed to derive the overall mass flows and temperatures. Model results were compared to experimental and numerical data with good agreement.
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