Ravi Shankar, Rajeev Kumar, Arun Kumar Pandey, Deep Singh Thakur
Abstract To improve the thermal and hydraulic performance of artificially roughened solar air heaters (SAHs), the current study analyzes the thermal-hydraulic performance or thermal enhancement factor of artificially roughened solar air heaters. In present experimental research on a solar air heater's absorber plate, newly designed spiral-shaped semi-conical ribs have been explored. The spiral-shaped semi-conical ribs have been designed with the aim of reducing the pressure drop across the rib so that thermal performance may be improved with a little increase in pressure drop after integrating the ribs into the SAH mainstream flow. The higher value of thermal-hydraulic performance indicates an increased heat transfer rate with a minimum increase in pumping power. In order to achieve the highest possible thermal enhancement factor, this experimental study intends to analyze the effects of different geometrical parameters on the heat transmission and friction behavior of numerous spiral-shaped semi-conical ribs. Multiple experiments were conducted using different levels of roughness heights to optimize the rib profile parameters. The Reynolds number (Re) ranges from 3358.65 to 18,095.59, the relative roughness height (e/Dh) 0.09 to 0.227, and relative roughness pitch (P/e) 3.7 to 5.5. These multiple spiral-shaped semi-conical ribs give the maximum thermal enhancement factor of 2.85 at (e/Dh) 0.182 and P/e of 4.1 at Reynolds number 18,095.59. It has been found that current rib geometry can increase the thermal performance of solar air heaters with minimum increased pumping power with reference to rib explored by earlier researchers.
{"title":"Experimental Analysis of a Solar Air Heater Featuring Multiple Spiral-Shaped Semi-Conical Ribs","authors":"Ravi Shankar, Rajeev Kumar, Arun Kumar Pandey, Deep Singh Thakur","doi":"10.1115/1.4063858","DOIUrl":"https://doi.org/10.1115/1.4063858","url":null,"abstract":"Abstract To improve the thermal and hydraulic performance of artificially roughened solar air heaters (SAHs), the current study analyzes the thermal-hydraulic performance or thermal enhancement factor of artificially roughened solar air heaters. In present experimental research on a solar air heater's absorber plate, newly designed spiral-shaped semi-conical ribs have been explored. The spiral-shaped semi-conical ribs have been designed with the aim of reducing the pressure drop across the rib so that thermal performance may be improved with a little increase in pressure drop after integrating the ribs into the SAH mainstream flow. The higher value of thermal-hydraulic performance indicates an increased heat transfer rate with a minimum increase in pumping power. In order to achieve the highest possible thermal enhancement factor, this experimental study intends to analyze the effects of different geometrical parameters on the heat transmission and friction behavior of numerous spiral-shaped semi-conical ribs. Multiple experiments were conducted using different levels of roughness heights to optimize the rib profile parameters. The Reynolds number (Re) ranges from 3358.65 to 18,095.59, the relative roughness height (e/Dh) 0.09 to 0.227, and relative roughness pitch (P/e) 3.7 to 5.5. These multiple spiral-shaped semi-conical ribs give the maximum thermal enhancement factor of 2.85 at (e/Dh) 0.182 and P/e of 4.1 at Reynolds number 18,095.59. It has been found that current rib geometry can increase the thermal performance of solar air heaters with minimum increased pumping power with reference to rib explored by earlier researchers.","PeriodicalId":17124,"journal":{"name":"Journal of Solar Energy Engineering-transactions of The Asme","volume":"72 19","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135088212","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Moh Ali Hadj Ammar, Mohamed ElHadi Attia, Abdeldjalil Laouini, Ali Zine, Salhi Khelifa, Abdelkader Haris, Anil Kumar
Abstract In this paper, experimental work has been presented to study the novel design of a solar crop dryer that includes an inverted absorber perforate type collector with forced airflow. A novel design configuration was constructed and tested in the eastern Algeria climate (El-Oued city) for drying of potatoes. Aim to present a test of the thermal performance of the novel dryer and use only clean energy sources for evaluated of the drying efficiency. Under real climatic conditions, the experimental test indicates that the average air temperature of the drying chamber of 50°C, and the time required for drying potato starting at the initial moisture contents (MC) of 84.17% until final MC of 12.5% was 6h. Highest specific moisture extraction rate value was obtained as 1.074 g water/kWh. The Drying efficiencies ranged from 20.37 to 34.01%, whereas the exergy efficiency ranged from 58.48 to 93.22%. Payback period was estimated as 1.39 years. The proposed novel dryer will dry potatoes free of cost for almost its entire life period and about $13.92 can be saved. Compared with electric oven drying, the advantage of the novel one, the cost of electricity saving and avoiding penalty tax for CO2 emission, were $11.69 and $2.235, respectively.
{"title":"Design and Performance Evaluation of a Novel Solar Dryer for Drying Potatoes in the Eastern Algerian Sahara","authors":"Moh Ali Hadj Ammar, Mohamed ElHadi Attia, Abdeldjalil Laouini, Ali Zine, Salhi Khelifa, Abdelkader Haris, Anil Kumar","doi":"10.1115/1.4064017","DOIUrl":"https://doi.org/10.1115/1.4064017","url":null,"abstract":"Abstract In this paper, experimental work has been presented to study the novel design of a solar crop dryer that includes an inverted absorber perforate type collector with forced airflow. A novel design configuration was constructed and tested in the eastern Algeria climate (El-Oued city) for drying of potatoes. Aim to present a test of the thermal performance of the novel dryer and use only clean energy sources for evaluated of the drying efficiency. Under real climatic conditions, the experimental test indicates that the average air temperature of the drying chamber of 50°C, and the time required for drying potato starting at the initial moisture contents (MC) of 84.17% until final MC of 12.5% was 6h. Highest specific moisture extraction rate value was obtained as 1.074 g water/kWh. The Drying efficiencies ranged from 20.37 to 34.01%, whereas the exergy efficiency ranged from 58.48 to 93.22%. Payback period was estimated as 1.39 years. The proposed novel dryer will dry potatoes free of cost for almost its entire life period and about $13.92 can be saved. Compared with electric oven drying, the advantage of the novel one, the cost of electricity saving and avoiding penalty tax for CO2 emission, were $11.69 and $2.235, respectively.","PeriodicalId":17124,"journal":{"name":"Journal of Solar Energy Engineering-transactions of The Asme","volume":"63 5","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135475512","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Abstract Moving packed-bed heat exchanger in concentrated solar power (CSP) plants involves heat transfer between heated falling particles and supercritical carbon dioxide. The overall effective thermal conductivity of the moving packed bed and particle-side channel contact resistances are still the bottlenecks in achieving the desirable thermal transport levels. To this end, a novel moving packed bed heat exchanger consisting of Octet lattice packed between the walls of the particle-side channel is proposed in this study. Granular flow analysis in Octet lattice moving-packed bed heat exchanger (OLHX) was conducted through experiments and DEM-based numerical simulations. The experimental images clearly demonstrated stagnation regions upstream of lattice fibers, void regions downstream of the fiber junctions and wavy type unobstructed flow on lateral sides of the fibers. DEM simulations were successful in capturing all these critical flow phenomena. Larger flow velocities were observed on the lateral sides of the fibers in the simulations. Also, when the particles in the silo were emptied, the final images showed accumulation of particles on the inter-fiber as well as fiber-channel wall junctions. Moreover, the fiber connections resulted in some regions devoid of the particle contact on the channel endwall which means that these regions would suffer from poor thermal exchange. The overall mass flow rate increased with increasing porosity for a fixed particle diameter.
{"title":"Granular flow in novel Octet shape-based lattice frame material","authors":"Inderjot Kaur, Youssef Aider, Heejin Cho, Prashant Singh","doi":"10.1115/1.4064018","DOIUrl":"https://doi.org/10.1115/1.4064018","url":null,"abstract":"Abstract Moving packed-bed heat exchanger in concentrated solar power (CSP) plants involves heat transfer between heated falling particles and supercritical carbon dioxide. The overall effective thermal conductivity of the moving packed bed and particle-side channel contact resistances are still the bottlenecks in achieving the desirable thermal transport levels. To this end, a novel moving packed bed heat exchanger consisting of Octet lattice packed between the walls of the particle-side channel is proposed in this study. Granular flow analysis in Octet lattice moving-packed bed heat exchanger (OLHX) was conducted through experiments and DEM-based numerical simulations. The experimental images clearly demonstrated stagnation regions upstream of lattice fibers, void regions downstream of the fiber junctions and wavy type unobstructed flow on lateral sides of the fibers. DEM simulations were successful in capturing all these critical flow phenomena. Larger flow velocities were observed on the lateral sides of the fibers in the simulations. Also, when the particles in the silo were emptied, the final images showed accumulation of particles on the inter-fiber as well as fiber-channel wall junctions. Moreover, the fiber connections resulted in some regions devoid of the particle contact on the channel endwall which means that these regions would suffer from poor thermal exchange. The overall mass flow rate increased with increasing porosity for a fixed particle diameter.","PeriodicalId":17124,"journal":{"name":"Journal of Solar Energy Engineering-transactions of The Asme","volume":"89 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135432841","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Wei Feng, Yu Gao, Wei Li, Junye Li, Yanlong Cao, Tianwen Li, S.A. Sherif, Ma Lian-xiang, Hanbing Ke
Abstract A horizontal smooth copper tube and two enhanced tubes (a dimpled tube and a diamond-shaped tube) with a length of 2 m and an outer diameter of 9.52 mm were studied in a two-phase condensation experiment using R410A and R32 as heat transfer working fluids. The condensation heat transfer performance of different heat transfer tubes at various mass fluxes ranging from 150 to 400 kg/(m2s) and different vapor qualities ranging from 0.8 to 0.2 was studied experimentally. For R410A, the heat transfer coefficients (HTCs) of the dimpled tube and the diamond-shaped tube were found to be 1.39–1.52 times and 1.30–1.35 times higher than those of the smooth tube, respectively. For R32, the HTCs were found to be 1.46–1.59 times higher for the dimpled tube and 1.26–1.35 times higher for the diamond-shaped tube than for the smooth tube. The diamond-shaped tube was found to be effective in directing the flow of the liquid phase and in thinning the liquid film thickness. The dimpled tube was found to promote droplet entrainment and disturbance. Both of those effects contributed to improving the HTCs in the two enhanced tubes investigated. The HTCs of R410A were found to be lower than those of R32 because of the smaller specific heat capacity, smaller latent heat of condensation, and relatively poorer thermal conductivity of R410A. Taking the combined effect of heat transfer and pressure drop into account, a performance enhancement factor (PEF) was computed and was found to range from 0.9 to 1.51. Based on the experimental data collected, a new empirical correlation equation has been proposed with a maximum error band of 10%. Flow pattern maps for the tested tubes have also been generated and are presented in the paper. Both of the two enhanced tubes were found to promote the development of annular flow. The HTCs were found to be highest when the flow pattern was of the annular flow type.
{"title":"Condensation Heat Transfer Experiments of R410A and R32 in Horizontal Smooth and Enhanced Tubes","authors":"Wei Feng, Yu Gao, Wei Li, Junye Li, Yanlong Cao, Tianwen Li, S.A. Sherif, Ma Lian-xiang, Hanbing Ke","doi":"10.1115/1.4063855","DOIUrl":"https://doi.org/10.1115/1.4063855","url":null,"abstract":"Abstract A horizontal smooth copper tube and two enhanced tubes (a dimpled tube and a diamond-shaped tube) with a length of 2 m and an outer diameter of 9.52 mm were studied in a two-phase condensation experiment using R410A and R32 as heat transfer working fluids. The condensation heat transfer performance of different heat transfer tubes at various mass fluxes ranging from 150 to 400 kg/(m2s) and different vapor qualities ranging from 0.8 to 0.2 was studied experimentally. For R410A, the heat transfer coefficients (HTCs) of the dimpled tube and the diamond-shaped tube were found to be 1.39–1.52 times and 1.30–1.35 times higher than those of the smooth tube, respectively. For R32, the HTCs were found to be 1.46–1.59 times higher for the dimpled tube and 1.26–1.35 times higher for the diamond-shaped tube than for the smooth tube. The diamond-shaped tube was found to be effective in directing the flow of the liquid phase and in thinning the liquid film thickness. The dimpled tube was found to promote droplet entrainment and disturbance. Both of those effects contributed to improving the HTCs in the two enhanced tubes investigated. The HTCs of R410A were found to be lower than those of R32 because of the smaller specific heat capacity, smaller latent heat of condensation, and relatively poorer thermal conductivity of R410A. Taking the combined effect of heat transfer and pressure drop into account, a performance enhancement factor (PEF) was computed and was found to range from 0.9 to 1.51. Based on the experimental data collected, a new empirical correlation equation has been proposed with a maximum error band of 10%. Flow pattern maps for the tested tubes have also been generated and are presented in the paper. Both of the two enhanced tubes were found to promote the development of annular flow. The HTCs were found to be highest when the flow pattern was of the annular flow type.","PeriodicalId":17124,"journal":{"name":"Journal of Solar Energy Engineering-transactions of The Asme","volume":"169 S361","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135777661","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Anthony Ozurumba, Nnamdi V. Ogueke, Chinyere Ada Madu
Abstract For organometallic halide solar cells (OHSC), it is expected that their performance in hot climates is to be challenged by high operating temperature conditions typical of these regions. This study explores, for the first time, the performance of formamidinium tin iodide (FASnI3) solar cells under variations of seasonal and climatic conditions in Nigeria using a non-steady- state thermal model. From the thermal analysis, results show that the air temperature in the location of the solar cell under study played a significant role in the increase and decrease of the rate of the overall heat transfer coefficient of the OHSC. However, the cell temperature depended on the rate of heat loss and the solar radiation absorbed by the OHSC. The electrical analysis was based on the numerical simulation of a FASnI3 solar cell with the aid of a Solar Cell Capacitance Simulator (SCAPS). A decrease in the power conversion efficiency (PCE) as the cell temperature increased was observed. Overall, while the OHSC suffered losses in efficiency in all locations during the hot season, the wet season saw an improvement in the PCE, especially in Twon-Brass (0.5% increase) where the most heat loss and least insolation were recorded. This shows that the power conversion efficiency of an operating OHSC is temperature-dependent, rather than the abundance of solar irradiance.
{"title":"Thermal and Electrical Analysis of Organometallic Halide Solar Cells","authors":"Anthony Ozurumba, Nnamdi V. Ogueke, Chinyere Ada Madu","doi":"10.1115/1.4063808","DOIUrl":"https://doi.org/10.1115/1.4063808","url":null,"abstract":"Abstract For organometallic halide solar cells (OHSC), it is expected that their performance in hot climates is to be challenged by high operating temperature conditions typical of these regions. This study explores, for the first time, the performance of formamidinium tin iodide (FASnI3) solar cells under variations of seasonal and climatic conditions in Nigeria using a non-steady- state thermal model. From the thermal analysis, results show that the air temperature in the location of the solar cell under study played a significant role in the increase and decrease of the rate of the overall heat transfer coefficient of the OHSC. However, the cell temperature depended on the rate of heat loss and the solar radiation absorbed by the OHSC. The electrical analysis was based on the numerical simulation of a FASnI3 solar cell with the aid of a Solar Cell Capacitance Simulator (SCAPS). A decrease in the power conversion efficiency (PCE) as the cell temperature increased was observed. Overall, while the OHSC suffered losses in efficiency in all locations during the hot season, the wet season saw an improvement in the PCE, especially in Twon-Brass (0.5% increase) where the most heat loss and least insolation were recorded. This shows that the power conversion efficiency of an operating OHSC is temperature-dependent, rather than the abundance of solar irradiance.","PeriodicalId":17124,"journal":{"name":"Journal of Solar Energy Engineering-transactions of The Asme","volume":"174 S404","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135775136","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Abstract Recently, direct absorption solar collector (DASC) system has emerged a new class of solar collectors with much improved solar thermal conversion potential over conventional surface-based absorption solar collectors. Further, introducing noble metallic particles like Ag, Au, Al, TiN, or Cu (at nano ranges) in the working fluids enhanced the optical properties of the working fluid and hence the overall thermal performance of such DASC systems. However, these novel thermal systems are prone to high emissive and radiative losses at high-temperature ranges. Additionally, the nanoparticles used in the working fluid are expensive, toxic after use, complex to synthesize, and mostly non-biodegradable. In the present study, a medium-flux asymmetric compound parabolic concentrator (ACPC) based concentrating DASC system has been tested over clear sky days in the months of September and October, 2022 at the composite climate of Jalandhar (latitude 31.25 deg N, longitude 75.44 deg E), India. A hybrid heat transfer fluid is prepared using Azadirachta Indica leaves’ extract and blended with gold plasmonic nanoparticles (Au nanoparticles of mean sizes ∼ 40 nm, mass fraction ∼ 4 ppm) to improve the overall thermal performance of the concentrating DASC system. Stored energy fraction of hybrid heat transfer fluid at a depth of 2 cm reached about 74.9%, which is about 67% higher than base fluid water. The outdoor experiments showed that hybrid heat transfer fluid had about 10.4 °C higher temperature gains in concentrating DASC system, and the photo-thermal efficiency was enhanced up to 40% as compared to base fluid water. The study demonstrates the advantage of an eco-friendly, low cost, and highly stable hybrid heat transfer fluid as a potential candidate for a medium-flux DASC system.
{"title":"Photo-thermal conversion analysis of a medium-flux direct absorption solar system using gold nanoparticles with natural extract of <i>Azadirachta Indica</i>","authors":"Parminder Singh, Sanjay Kumar, Ashok Kumar Bagha","doi":"10.1115/1.4063809","DOIUrl":"https://doi.org/10.1115/1.4063809","url":null,"abstract":"Abstract Recently, direct absorption solar collector (DASC) system has emerged a new class of solar collectors with much improved solar thermal conversion potential over conventional surface-based absorption solar collectors. Further, introducing noble metallic particles like Ag, Au, Al, TiN, or Cu (at nano ranges) in the working fluids enhanced the optical properties of the working fluid and hence the overall thermal performance of such DASC systems. However, these novel thermal systems are prone to high emissive and radiative losses at high-temperature ranges. Additionally, the nanoparticles used in the working fluid are expensive, toxic after use, complex to synthesize, and mostly non-biodegradable. In the present study, a medium-flux asymmetric compound parabolic concentrator (ACPC) based concentrating DASC system has been tested over clear sky days in the months of September and October, 2022 at the composite climate of Jalandhar (latitude 31.25 deg N, longitude 75.44 deg E), India. A hybrid heat transfer fluid is prepared using Azadirachta Indica leaves’ extract and blended with gold plasmonic nanoparticles (Au nanoparticles of mean sizes ∼ 40 nm, mass fraction ∼ 4 ppm) to improve the overall thermal performance of the concentrating DASC system. Stored energy fraction of hybrid heat transfer fluid at a depth of 2 cm reached about 74.9%, which is about 67% higher than base fluid water. The outdoor experiments showed that hybrid heat transfer fluid had about 10.4 °C higher temperature gains in concentrating DASC system, and the photo-thermal efficiency was enhanced up to 40% as compared to base fluid water. The study demonstrates the advantage of an eco-friendly, low cost, and highly stable hybrid heat transfer fluid as a potential candidate for a medium-flux DASC system.","PeriodicalId":17124,"journal":{"name":"Journal of Solar Energy Engineering-transactions of The Asme","volume":"24 10","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135769505","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Walid Ben Amara, Abdallah Bouabidi, Mouldi chrigui
Abstract This study focuses on improving the thermal performance of a Solar Air Heater (SAH) using a single-pass spiral-shaped ducts. The SAH is designed and tested under prevailing weather conditions of Gabes,TUNISIA (33°52.8876' N,10°5.892' E). The experimental measurements are carried out over four days. Similarly, a CFD model developed to study the fluid flow and the heat transfer inside the SAH using the commercial software “ANSYS Fluent 2021 R1”. The discrete ordinate (DO) radiation model and the k-ω Shear Stress Transport (SST) turbulence model are used to study the radiative heat transfer and the turbulent flow in the SAH, respectively. The numerical model is validated against experimental data and the average error does not exceed 3.6 %. To improve the heat transfer phenomena, the ratio of horizontal baffle spacing “d” to vertical baffle spacing “p” (d/p) are numerically investigated. Moreover, the highest air outlet temperature during the test days is reached 81.1°C under a mass flow rate of 0.0077kg/s. The maximum efficiencies are 57%, 54%, 49% and 46% for the configurations d/p=1.5, d/p =2, d/p=1 and d/p =0.5 under a mass flow rate of 0.02 kg/s, respectively. The SAH design with d/p=1.5 is about 4-10% more efficient than the standard design with d/p=1 under a mass flow rate ranging from 0.0077kg/s to 0.025kg/s.
{"title":"Thermal performance improvement of a spiral channel solar air heater: Numerical and experimental investigation in the desert climate of Gabes region","authors":"Walid Ben Amara, Abdallah Bouabidi, Mouldi chrigui","doi":"10.1115/1.4063857","DOIUrl":"https://doi.org/10.1115/1.4063857","url":null,"abstract":"Abstract This study focuses on improving the thermal performance of a Solar Air Heater (SAH) using a single-pass spiral-shaped ducts. The SAH is designed and tested under prevailing weather conditions of Gabes,TUNISIA (33°52.8876' N,10°5.892' E). The experimental measurements are carried out over four days. Similarly, a CFD model developed to study the fluid flow and the heat transfer inside the SAH using the commercial software “ANSYS Fluent 2021 R1”. The discrete ordinate (DO) radiation model and the k-ω Shear Stress Transport (SST) turbulence model are used to study the radiative heat transfer and the turbulent flow in the SAH, respectively. The numerical model is validated against experimental data and the average error does not exceed 3.6 %. To improve the heat transfer phenomena, the ratio of horizontal baffle spacing “d” to vertical baffle spacing “p” (d/p) are numerically investigated. Moreover, the highest air outlet temperature during the test days is reached 81.1°C under a mass flow rate of 0.0077kg/s. The maximum efficiencies are 57%, 54%, 49% and 46% for the configurations d/p=1.5, d/p =2, d/p=1 and d/p =0.5 under a mass flow rate of 0.02 kg/s, respectively. The SAH design with d/p=1.5 is about 4-10% more efficient than the standard design with d/p=1 under a mass flow rate ranging from 0.0077kg/s to 0.025kg/s.","PeriodicalId":17124,"journal":{"name":"Journal of Solar Energy Engineering-transactions of The Asme","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135569684","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this paper, a segmented specular reflection solar concentrator is proposed. Many mirrors are arranged in the same plane, and all the reflected rays fall on the cylindrical focal surface. The glass mirrors are placed in different positions, tilt angles and widths, and reflect light without blocking each other. Through the theoretical analysis of this type of concentrating system, in the same space span, with the increase of the installation height of the cylindrical focal surface, the concentrating ratio and area utilization rate gradually increase. The area utilization ratio is related to the ratio of mirror installation span and receiver height, and the concentrating ratio is linear to the number of mirrors. Through multiple groups of photothermal experimental analysis, it can be concluded that under the same heat collection temperature, the greater the radiation intensity received of the heat collecting tube, the higher the heat collection efficiency of the solar collecting system.
{"title":"Theoretical Analysis and Photothermal Experimental Study of a Segmented Specular Reflection Solar Concentrator","authors":"Qian Zhang, Song Chen","doi":"10.1115/1.4063856","DOIUrl":"https://doi.org/10.1115/1.4063856","url":null,"abstract":"In this paper, a segmented specular reflection solar concentrator is proposed. Many mirrors are arranged in the same plane, and all the reflected rays fall on the cylindrical focal surface. The glass mirrors are placed in different positions, tilt angles and widths, and reflect light without blocking each other. Through the theoretical analysis of this type of concentrating system, in the same space span, with the increase of the installation height of the cylindrical focal surface, the concentrating ratio and area utilization rate gradually increase. The area utilization ratio is related to the ratio of mirror installation span and receiver height, and the concentrating ratio is linear to the number of mirrors. Through multiple groups of photothermal experimental analysis, it can be concluded that under the same heat collection temperature, the greater the radiation intensity received of the heat collecting tube, the higher the heat collection efficiency of the solar collecting system.","PeriodicalId":17124,"journal":{"name":"Journal of Solar Energy Engineering-transactions of The Asme","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135569688","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Abstract This study offers a comprehensive assessment of the thermodynamic performance of a novel solar-based multigeneration system, which caters to the energy needs of a sustainable community by producing electricity, cooling, heating, and freshwater. The solar-based multigeneration system is comprised of four main components: the thermal subsystem of the parabolic trough collector (PTC) employing CO2 as a heat transfer fluid, a single-effect absorption refrigeration cycle (ARC), a supercritical CO2 (S-CO2) cycle, and an adsorption desalination (AD) cycle with heat recovery employing aluminum fumarate metal–organic framework (MOF) adsorbent material. A comprehensive parametric study was performed on the proposed solar-based multigeneration system by varying key parameters to evaluate its performance. It is found that the thermal and exergy efficiencies of a PTC were evaluated to be 68.35% and 29.88%, respectively, at a fixed inlet temperature of 225 °C and solar irradiation of 850 W/m2 and also a slight reduction in the ARC cycle when examining the variation in the thermal and exergetic COPs for the generator temperature. Additionally, the thermal and exergy efficiencies of electricity, cooling, and heating were determined to be 20.41% and 21.93%, 41.34% and 3.51%, and 7.14% and 3.07%, respectively, at the operating condition. The maximum specific daily water production (SDWP) value of 12.91 m3/ton/day and a gain output ratio (GOR) of 0.64 were obtained under steady operating conditions in the AD cycle.
{"title":"Thermodynamic analysis and performance assessment of a novel solar-based multigeneration system for electricity, cooling, heating, and freshwater production","authors":"Mohd Asjad Siddiqui","doi":"10.1115/1.4063622","DOIUrl":"https://doi.org/10.1115/1.4063622","url":null,"abstract":"Abstract This study offers a comprehensive assessment of the thermodynamic performance of a novel solar-based multigeneration system, which caters to the energy needs of a sustainable community by producing electricity, cooling, heating, and freshwater. The solar-based multigeneration system is comprised of four main components: the thermal subsystem of the parabolic trough collector (PTC) employing CO2 as a heat transfer fluid, a single-effect absorption refrigeration cycle (ARC), a supercritical CO2 (S-CO2) cycle, and an adsorption desalination (AD) cycle with heat recovery employing aluminum fumarate metal–organic framework (MOF) adsorbent material. A comprehensive parametric study was performed on the proposed solar-based multigeneration system by varying key parameters to evaluate its performance. It is found that the thermal and exergy efficiencies of a PTC were evaluated to be 68.35% and 29.88%, respectively, at a fixed inlet temperature of 225 °C and solar irradiation of 850 W/m2 and also a slight reduction in the ARC cycle when examining the variation in the thermal and exergetic COPs for the generator temperature. Additionally, the thermal and exergy efficiencies of electricity, cooling, and heating were determined to be 20.41% and 21.93%, 41.34% and 3.51%, and 7.14% and 3.07%, respectively, at the operating condition. The maximum specific daily water production (SDWP) value of 12.91 m3/ton/day and a gain output ratio (GOR) of 0.64 were obtained under steady operating conditions in the AD cycle.","PeriodicalId":17124,"journal":{"name":"Journal of Solar Energy Engineering-transactions of The Asme","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135823856","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Seyyed Ali Sadat, Nicholas Vandewetering, Joshua Pearce
Abstract Using bolts through the back of a solar photovoltaic (PV) module frames to attach them to racking is time consuming and awkward, so commercial PV installations use clamping technologies on the front. Conventional and proprietary clamps are costly and demand access to supply chains for uncommon mechanical components that limit deployment velocity. To overcome these challenges, this study presents new open-source downward-fastened and side-fastened aluminum (Al) framing designs, which are easy to install and compatible with metal and wood racks. The proposed parametric open-source designs are analyzed through finite element method (FEM) simulations and economic analysis is performed to compare to conventional PV frame at both the module and system levels. The FEM results showed all the frames have acceptable mechanical reliability and stability to pass IEC 61215 standards. The results show the new frame (with a bottom width of 29 mm and thickness of 1.5 mm) has about a 2% land use efficiency penalty, but has better mechanical stability (lower stress and deflections), is easier to install, and has reduced material economic costs compared to conventional frames. The results are promising for the use of the new PV frame designs for distributed manufacturing targeted at specific applications.
{"title":"Mechanical and economic analysis of conventional aluminum photovoltaic module frames, frames with side holes, and open-source downward-fastened frames for non-traditional racking","authors":"Seyyed Ali Sadat, Nicholas Vandewetering, Joshua Pearce","doi":"10.1115/1.4063493","DOIUrl":"https://doi.org/10.1115/1.4063493","url":null,"abstract":"Abstract Using bolts through the back of a solar photovoltaic (PV) module frames to attach them to racking is time consuming and awkward, so commercial PV installations use clamping technologies on the front. Conventional and proprietary clamps are costly and demand access to supply chains for uncommon mechanical components that limit deployment velocity. To overcome these challenges, this study presents new open-source downward-fastened and side-fastened aluminum (Al) framing designs, which are easy to install and compatible with metal and wood racks. The proposed parametric open-source designs are analyzed through finite element method (FEM) simulations and economic analysis is performed to compare to conventional PV frame at both the module and system levels. The FEM results showed all the frames have acceptable mechanical reliability and stability to pass IEC 61215 standards. The results show the new frame (with a bottom width of 29 mm and thickness of 1.5 mm) has about a 2% land use efficiency penalty, but has better mechanical stability (lower stress and deflections), is easier to install, and has reduced material economic costs compared to conventional frames. The results are promising for the use of the new PV frame designs for distributed manufacturing targeted at specific applications.","PeriodicalId":17124,"journal":{"name":"Journal of Solar Energy Engineering-transactions of The Asme","volume":"214 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135824313","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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