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Journal articles on the topic 'Horizontal collectors'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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1

Odeh, S. D., M. Behnia, and G. L. Morrison. "Hydrodynamic Analysis of Direct Steam Generation Solar Collectors." Journal of Solar Energy Engineering 122, no. 1 (1999): 14–22. http://dx.doi.org/10.1115/1.556273.

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Direct steam generation collectors are considered with the aim to improve the performance of a parabolic trough collector leading to a reduction of operating costs of solar electric generation systems. In this study a hydrodynamic steady state model is developed and linked with a thermal model to optimize the performance of once-through direct steam generation solar collectors. The hydrodynamic model includes flow pattern classification and a pressure drop model. Flow pattern maps for typical DSG collectors with horizontal and inclined absorber tubes are generated to investigate the variation

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2

Li, Shaohua, Yang Li, Longlin Chen, Xianbin Wang, and Weihang Kong. "Collecting Performance Prediction for the Rubber Collector in Horizontal Wellbore Based on AutoML." Sensors 25, no. 6 (2025): 1836. https://doi.org/10.3390/s25061836.

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To objectively study the influencing factors of rubber collector performance in horizontal wellbores and identify parameter optimization directions, this paper introduces a modeling approach for rubber collectors in horizontal wellbores and develops a corresponding performance prediction method using AutoML(implemented with AutoGluon V1.2.0). Specifically, the study establishes a simulated model of a rubber collector in a horizontal wellbore, simulating its operational state under eccentric conditions due to gravity. It evaluates the impact of rubber elastic element properties (such as materia

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3

Thomas, Daniel E. "PERFORMANCE OF HORIZONTAL WATER-IN-GLASS EVACUATED TUBE SOLAR COLLECTORS." Journal of Mechanical Engineering 45, no. 2 (2016): 130–34. http://dx.doi.org/10.3329/jme.v45i2.28212.

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Water-in-glass evacuated tube solar collectors are widely used in two main configurations: (1) a single row of tilted tubes connected to a header tank, and (2) two rows of horizontal tubes on either side of a central manifold. Published studies on water-in-glass collectors have been focused almost entirely on the former, commonly used for domestic water heating applications. This study considers the latter type, which is well suited to larger solar water heating applications. Experimental data from outdoor testing demonstrates a good fit to the ISO 9459-2 expression for collector performance.

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Arifjanov, Aybek, Maqsud Otaxonov, Luqmon Samiev, and Shamshodbek Akmalov. "Hydraulic calculation of horizontal open drainages." E3S Web of Conferences 97 (2019): 05039. http://dx.doi.org/10.1051/e3sconf/20199705039.

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In article analysed the factors influencing the hydraulic processes which arise in the open horizontal drainage systems. Open drainages plays important role in order to improve the ameliorative condition of the agricultural area, salt washing on the soil. It is emphasized that the deep drainage in our region has a good effect on the soil condition and salt removing. At present, efforts are being made to improve the productivity of the collectors to clean and built. As example the collector drainage systems in Syrdarya region are listed. It is observed that the motion mode of open drainage flow

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5

Hallyyev, I., and K. H. Gilfanov. "Decreasing cost of heat pump heat supply systemby changing first circuit collector." Power engineering: research, equipment, technology 22, no. 1 (2020): 28–37. http://dx.doi.org/10.30724/1998-9903-2020-22-1-28-37.

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The aim of this work is to reduce the cost of the heat pump heating system by using a solar collector in the primary circuit of the heat pump. It is known that the price of material and installation of the primary circuit collector is 30% of the total cost of the heat pump heating system. The use of a solar collector in the primary circuit of a heat pump eliminates the need for drilling or underground installation of a low-potential thermal energy collector. The rejection of the classic types of collectors: horizontal collectors and vertical probes, also has a positive environmental effect on

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6

Al-Najjar, Hussein Mohammed Taqi. "Study of Energy Gains by Orientation of Solar Collectors in Baghdad City." Journal of Engineering 21, no. 10 (2015): 17–35. http://dx.doi.org/10.31026/j.eng.2015.10.02.

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Firstly, in this study, a brief updated description and applications of different solar collectors used in renewable energy systems for supplying electric and thermal energy was presented. Secondly, an attempt was made to utilize tilting orientation of solar collector for maximizing collector energy with time in respect to horizontal orientation. For energy calculation, global solar radiation was used since they are directly related. For that purpose, field measurements of half-hourly radiation on two flat panels of tilting and horizontal orientations were carried out throughout 8-month period

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Bilgen, E., and M. A. Richard. "Horizontal concrete slabs as passive solar collectors." Solar Energy 72, no. 5 (2002): 405–13. http://dx.doi.org/10.1016/s0038-092x(02)00014-2.

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8

Aronescu, Avi, and Joseph Appelbaum. "Shading on Photovoltaic Collectors on Rooftops." Applied Sciences 10, no. 8 (2020): 2977. http://dx.doi.org/10.3390/app10082977.

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Rooftop photovoltaic (PV) systems in urban environments play an important role in solar electric energy generation. Shading on PV collectors, by self-shading, walls and fences on rooftops, affect negatively the output energy of the PV systems. Increasing the distance between the collector rows, and between the walls and fences near to the collectors, may minimize the shading losses. Practically, this option is usually limited, especially on rooftops. Rooftops may be of different types: horizontal, inclined, and saw-tooth, and may have obscuring structures like walls and fences. The distance be

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9

Todoran, Tudor Paul, and Mugur Ciprian Balan. "Ground Temperature Variation around the Horizontal Collectors of a Heat Pump." Applied Mechanics and Materials 659 (October 2014): 481–86. http://dx.doi.org/10.4028/www.scientific.net/amm.659.481.

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The manuscript presents results of a 3 years experiment concerning the monitoring of temperature variation around a horizontal collector, coupled to a ground – water heat pump. Ground temperature was monitored in 7 (seven) measurement points: 1 (one) in the center of the collector area and 6 (six) at 15 cm, 30 cm and 60 cm of the collector boundary. The data processing methodology, described in the manuscript, allowed corrections, comparison with natural ground temperature variation and calculation of important characteristics of temperature variation in each measurement point. The main obtain

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10

Patay, István, Miklós Erdélyi, and László Gulyás. "Developing and testing solar collectors." Progress in Agricultural Engineering Sciences 5, no. 1 (2009): 55–74. http://dx.doi.org/10.1556/progress.5.2009.3.

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A relatively new trend is the development of concentrator-type solar collectors and cells for the use in micro-concentrators. The geometry of these concentrators is simple, the reflexion surfaces or mirrors are usually flat-plate surfaces. The relations of radiation in the inner spaces of these collectors are complicated. The OSLO optical edition software can be used to study and simulate the light paths in the concentrator elements and resonators, using the laws of geometrical optics. Based on the results of study and simulation, a pilot collector was built for energetic testing. In the appli

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11

Appelbaum, Joseph, Avi Aronescu, and Tamir Maor. "Shading by Overhang PV Collectors." Applied Sciences 9, no. 20 (2019): 4280. http://dx.doi.org/10.3390/app9204280.

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Photovoltaic modules integrated into buildings may provide shading to windows, doors and walls to protect against sun rays and at the same time generate ancillary electrical energy. The study develops the methodology for calculating the shadow variation cast by overhangs on doors, windows, carports, and calculates the annual incident energy (beam, diffuse and global energy) on overhangs made up of conventional and bifacial PV modules. The methodology of the present study is different from published articles including software programs. The study starts with shadows on walls cast by a horizonta

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12

Furbo, Simon, Niels Kristian Vejen, and Louise Jivan Shah. "Thermal Performance of a Large Low Flow Solar Heating System With a Highly Thermally Stratified Tank." Journal of Solar Energy Engineering 127, no. 1 (2005): 15–20. http://dx.doi.org/10.1115/1.1767190.

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In year 2000 a 336 m2 solar domestic hot water system was built in Sundparken, Elsinore, Denmark. The solar heating system is a low flow system with a 10000 l hot-water tank. Due to the orientation of the buildings half of the solar collectors are facing east, half of the solar collectors are facing west. The collector tilt is 15° from horizontal for all collectors. Both the east-facing and the west-facing collectors have their own solar collector loop, circulation pump, external heat exchanger and control system. The external heat exchangers are used to transfer the heat from the solar collec

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13

Boubeghal, Abdelouahab, Salim Aoualmit, Abla Chaker, Ahmed Mediani, and Mohamed Azizi. "Theoretical and experimental study of a single-pass solar air collector for drying food products." Thermal Science, no. 00 (2025): 95. https://doi.org/10.2298/tsci250213095b.

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This paper involved a theoretical and experimental study of a single-pass solar air collector to supply hot air to a solar dryer. A Fortran code is developed to solve the heat transfer equations and determine the thermal performance of the collector's components, such as the absorber plate, glass cover, and heat transfer air. Three similar solar collectors, installed at different inclination angles (horizontal, 30? inclination, and 70? inclination), were constructed and tested at the Research Unit (URER-MS) in southern Algeria. The effect of the collector's inclination on its thermal performan

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Ahmed Abd-Eltawab Altaher, Mohamed Salama Abd-Elhady, Mohamed Nagiub El-Sheikh, and Seif Alnasr Ahmed. "The Effect of Using Secondary Reflectors on the Thermal Performance of Solar Collectors with Evacuated Tubes." Journal of Advanced Research in Fluid Mechanics and Thermal Sciences 99, no. 2 (2022): 187–96. http://dx.doi.org/10.37934/arfmts.99.2.187196.

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The aim of this paper is to improve the thermal performance of the evacuated tube solar collectors by using secondary reflectors and covering the collector surface area with an aluminum foil. Adding a secondary reflecting surface in the form of a parabola fixed on the end of the parabolic trough, acts as an additional reflective surface, which increases the input energy to the solar collector and consequently improves the thermal output of the collector. Two solar collectors were manufactured, one with modifications and the other without modifications, which is taken as a reference for the sak

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15

Srinivasan, J. "Convection suppression in horizontal solar collectors using density stratification." Solar Energy 48, no. 5 (1992): 287–89. http://dx.doi.org/10.1016/0038-092x(92)90056-g.

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16

Swaid, Saeed, Joseph Appelbaum, and Avi Aronescu. "Shading and Masking of PV Collectors on Horizontal and Sloped Planes Facing South and North—A Comparative Study." Energies 14, no. 13 (2021): 3850. http://dx.doi.org/10.3390/en14133850.

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With the increase in PV system installations, the available free land and rooftops for these systems may become scarcer, and therefore sloped fields facing the north may be utilized for that purpose. In deployments of PV collectors in multiple rows, either on horizontal or sloped planes, the second and subsequent rows are subject to two effects: shading and masking. Both effects reduce the electric energy generated by the PV systems. Multiple rows of collectors are deployed on horizontal planes and on sloped planes facing south, and literature on the topic has been published. No literature dea

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17

Gabániová, Ľubomíra, Dušan Kudelas, and Martin Prčík. "Modelling Ground Collectors and Determination of the Influence of Technical Parameters, Installation and Geometry on the Soil." Energies 14, no. 21 (2021): 7153. http://dx.doi.org/10.3390/en14217153.

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The main objective of this work was to model ground collectors with different parameters and geometries in ANSYS R19.2 and to simulate their operation during the heating season in Slovakia in order to determine their impact on the soil. At the same time, four new geometries in the shape of vertical spirals with diameters of 6, 8 and 10 m were designed and simulated to occupy a smaller area while maintaining performance similar to classical geometries. Due to climate change, heat pumps are becoming an important proxy in the heating of buildings and are an important part of decarbonisation plans

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18

Lu, Qing Ping, Chang Sheng Jiang, and Qing Ju Hao. "Stabilization of Chromium(VI) from Chromic Slag with Two Types of Thiol Collectors." Advanced Materials Research 414 (December 2011): 186–90. http://dx.doi.org/10.4028/www.scientific.net/amr.414.186.

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Two thiol collectors, sodium diethyldithiocarbamate (DDTC) and potassium ethyl xanthate (EXT), were adopted to stabilize hexavalent chromium from chromic slag. The average usage of each thiol collector is 62.5 μmol∙g-1 in chromic slag. The leaching characteristic of Cr6+ in chromic slag was analyzed according to the acidic extraction process with the toxicity characteristic leaching procedure (TCLP) and the procedures of extraction in water with the horizontal vibration method (HMV). Under the 0.1 mol∙L-1 TCLP and HMV conditions, we compared them with FeSO4 and found that two thiol collectors

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19

Liu, Xinchun, Yongde Kang, Hongna Chen, and Hui Lu. "Application of a High-Precision Aeolian Sand Collector in Field Wind and Sand Surveys." International Journal of Environmental Research and Public Health 18, no. 14 (2021): 7393. http://dx.doi.org/10.3390/ijerph18147393.

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Sand collectors are important for quantitatively monitoring aeolian sand activities. In this paper, an automatic high-precision sand collector was designed. Based on the measured data of aeolian transport performed with a piezoelectric saltation sensor (H11-Sensit) and a 10 m high meteorological tower, the sampling efficiency of the automatic sand sampler and the horizontal dust flux of the near surface were analyzed based on observed data. The results were as follows: the best-fitting function between the number of impacting sand particles and the amount of collected sand was a linear relatio

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20

Raza, Syed Ali, Syed Sulman Ahmad, Tahir Abdul Hussain Ratlamwala, Ghulam Hussain, and Mohammed Alkahtani. "Techno-Economic Analysis of Glazed, Unglazed and Evacuated Tube Solar Water Heaters." Energies 13, no. 23 (2020): 6261. http://dx.doi.org/10.3390/en13236261.

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In the residential sector, a great part of the electricity goes into heating water by electric water heaters, which results in high CO2 emissions as well as an unprecedented increase in electricity demand leading to an energy crisis. This study offers solar water heaters as a more economical and efficient replacement for electric water heaters. The present study is aimed at investigating the potential for solar water heaters in the subcontinent, especially in India. A feasibility analysis is performed for seven cities in the subcontinent, namely Mumbai, New Delhi, Kolkata, Assam, Gujrat and Ma

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21

Zlateva, Merima, Totyo Totev, and Dinko Kanev. "Analysis and determination of the optimal collector array orientation characteristics in solar systems." E3S Web of Conferences 551 (2024): 02014. http://dx.doi.org/10.1051/e3sconf/202455102014.

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This paper presents results analysis for the distribution of direct and diffuse solar radiation for a specific climatic zone in Bulgaria. The influence of the slope angle of the collector array over monthly solar radiation incident is studied and regression dependencies regarding incident total, direct and diffuse specific annual solar radiation are derived. Based on the obtained dependencies, the optimal value of the solar collectors slope angle, that guarantees maximum value of the annual solar radiation, is determined. The ratio of direct radiation on an inclined to that on a horizontal sur

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22

Huang, Xiao Chun, Ming Fu Hu, and Fu Sheng Dong. "The Calculation of Radiation and Optimum Tilt Angle on the Inclined Plane of South-Facing Collector in Winter Months." Advanced Materials Research 860-863 (December 2013): 48–53. http://dx.doi.org/10.4028/www.scientific.net/amr.860-863.48.

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In solar applications, collectors are usually installed with a tilt angel to obtain the maximum amount of radiation. In this paper, the anisotropic model -Hay model was used to calculate the daily total radiation on the tilt face and theoretical analysis was used to get the optimum tilt angel of southern collector face in winter months. Then the diffused radiation on horizontal face was obtained by using the isolation between daily total radiation and daily diffused radiation. Computer program was written to calculate the month radiation under different tilt angel and the maximum angel corresp

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23

Tang, Run Sheng, Yu Qin Yang, and Ya Mei Yu. "An Algorithm to Estimate Daily Collectible Beam Radiation on South-North Oriented Solar Tube Collectors." Advanced Materials Research 485 (February 2012): 301–5. http://dx.doi.org/10.4028/www.scientific.net/amr.485.301.

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It is essential to estimate the daily collectible radiation on collectors to predict the thermal performance of a solar system consisting of solar tube collectors. However, the calculation of daily collectible radiation actually received by a solar tube array is extremely complex. In this work, an algorithm for estimating daily beam radiation received by south-north oriented solar tube collectors (SNSTC) for the case of and is suggested based on monthly horizontal radiation and correlations suggested by Collares-Pereiraβ and Rabl. Comparisons of results between expected from the algorithm and

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Saputra, Maidi, Rizal Rizal, and Al Munawir. "PENINGKATAN EFISIENSI KOLEKTOR SURYA: MODIFIKASI MODEL FIN PIPA KOLEKTOR." Jurnal Mekanova: Mekanikal, Inovasi dan Teknologi 6, no. 1 (2020): 44. http://dx.doi.org/10.35308/jmkn.v6i1.2213.

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The use of solar energy in Indonesia is classified as having high potential; it is caused by Indonesia as a country on the equator. The use of solar energy today is widely used in the electricity generation sector and some in water heating and cooling systems. Excessive use of fossil energy will result in uncontrolled air pollution in the years to come. Increasing pollution in the air increases the greenhouse effect, and it causes an increase in acidic substances in the air, distribution of CO2 emissions, and an increase in room temperature. Therefore it is necessary to use energy derived from

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25

Khasanov, Bakhytzhan K., Akzhan K. Kasenov, Marlen S. Musaev, and Zhalgas M. Serniyazov. "Increasing the efficiency of the development of carbonate collectors by horizontal well systems." Kazakhstan journal for oil & gas industry 2, no. 1 (2020): 48–59. http://dx.doi.org/10.54859/kjogi95589.

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Reservoir development of fractured reservoirs is an essential problem. 90% of oil reserves in the fields of Kazmunaigas is concentrated in fractured reservoirs. Due to the double porosity, the development of such collectors is less effective by standard methods, therefore application of the new approaches is extremely vital. This article presents a method for developing pore-fractured reservoirs with a horizontal well system. To implement this method, 3D simulation model was build and respective calculations were performed. As a result, the horizontal well system has shown its efficiency compa

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Aronescu, Avi, and Joseph Appelbaum. "The Effect of Collector Azimuth on Inter-Row Shading in Photovoltaic Fields—A Comprehensive Point of View." Energies 16, no. 13 (2023): 4876. http://dx.doi.org/10.3390/en16134876.

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Rooftop buildings, mountain terrains, rivers, and lake beds may be oriented at different azimuths other than due south (in the northern hemisphere), on which photovoltaic (PV) systems may be installed. The present study presents a comprehensive point of view on the relation between the inter-row spacing and the inter-row shading in multiple-row collectors of PV fields; it analytically formulates the inter-row spacing and the associated shading losses for collectors deployed at any azimuth on horizontal, sloped-planed, and oriented toward the south and north, and is supported by the numerical r

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Pi, Seong-Min, and Seung-Hyun Kim. "A Study on the Optimum Design of Horizontal Collectors in Floodplain Filtration." Journal of Korean Society of Environmental Engineers 34, no. 6 (2012): 430–37. http://dx.doi.org/10.4491/ksee.2012.34.6.430.

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Li, Ming, Chao Wu, Zhi-yong Zhou, Wei-chun Lian, and Zhi-xiong Chen. "Design and Optimum of Dust Collector with Corrugated Plate for Underground Mine." Advances in Civil Engineering 2018 (October 23, 2018): 1–5. http://dx.doi.org/10.1155/2018/4368267.

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A set of dust collectors was designed with corrugated plate for an underground metal mine, which has low ventilation resistance, simple maintenance, and strong environmental adaptability. A three-dimensional simulation model was built based on ANSYS-Fluent software, and it was used to analyze the influence law of key parameters on the comprehensive dust removal efficiency; the angle of corrugated plate to the horizontal plane, the surface characteristics of plate, pressure loss and dust removal efficiency were discussed. The optimal design scheme of the dust collector was determined according

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29

Jyani, Lalit, Shivangi Sharma, Kailash Chaudhary, and Kamlesh Purohit. "Direct Absorption Solar Collector: An Experimental Investigation of Al2O3-H2O Nanofluid over the Flat Plate at Different Tilt Angles, and Mass-Flow Rates." New Energy Exploitation and Application 3, no. 1 (2024): 24–40. http://dx.doi.org/10.54963/neea.v3i1.214.

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The escalating demand for solar thermal energy, coupled with the current inefficiencies in existing systems, underscores the critical need for innovative advancements in thermal storage solar collectors. The efficiency of solar collectors relies not solely on design effectiveness but also on the thermophysical properties, such as heat capacity and thermal conductivity, inherent in the working fluid. This study investigates a novel solar collector with a gross area of 0.36 m2, operating on the principle of direct absorption. Experimental investigations were done at various tilt angles (15°, 20°

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30

Damian, Andrei, Marian Alexandru, and Tiberiu Catalina. "Numerical Evaluation of the Solar Collectors Selfshading Related to their Building Integration." Mathematical Modelling in Civil Engineering 13, no. 4 (2017): 12–26. http://dx.doi.org/10.1515/mmce-2017-0011.

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AbstractIn view of the recent preoccupation at worldwide level, for the integration of the solar systems components within the building skin, we made a numerical investigation in order to assess the opportunity to implement a long string of solar panels along a horizontal or vertical building surface.The study analyses deals with the phenomenon of self-shading, which appears in the case of medium and large solar systems that use solar panels placed one behind the other, along the same row (individual string), but also under the shape of parallel rows (parallel strings). The study creates a mat

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Giangrande, Adriana, Cataldo Pierri, Daniele Arduini, et al. "An Innovative IMTA System: Polychaetes, Sponges and Macroalgae Co-Cultured in a Southern Italian In-Shore Mariculture Plant (Ionian Sea)." Journal of Marine Science and Engineering 8, no. 10 (2020): 733. http://dx.doi.org/10.3390/jmse8100733.

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In this paper, we report data from the first year of rearing of a set of filter feeder bioremediator organisms: macrobenthic invertebrates (sabellid polychaetes and sponges), coupled with macroalgae, realized in a mariculture fish farm. This innovative integrated multi-trophic aquaculture (IMTA) system was realized at a preindustrial level in the Gulf of Taranto (southern Italy, northern Ionian Sea), within the framework of the EU Remedia Life project. Long lines containing different collector typologies were placed around the fish breeding cages. Vertical collectors were utilized for both pol

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Duran-Romero, Daniel, Josep Grau-Bové, Héctor Bolivar-Sanz, and Xilan Wu. "Assessment of Dust Deposition through Image Analysis in Complex and Remote Exhibition Sites: Study in the Cloister of the Santa María de El Paular Monastery in the Sierra de Guadarrama, Spain." Sustainability 16, no. 10 (2024): 4257. http://dx.doi.org/10.3390/su16104257.

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Dust deposition is an important aspect of the conservation of heritage collections. Most proposed methods for dust monitoring focus on total area coverage or airborne concentrations. There is a lack of published data and methodologies to obtain size distributions of deposited particles on real historic sites. The purpose of the study was to develop and describe a method for obtaining quantitative data from dust deposition without the need for sophisticated laboratory equipment, based on optical microscopy photography and software-based image analysis. Bare microscope slides were used as passiv

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Todoran, Tudor Paul, and Mugur Ciprian Balan. "Study of Ground – Water Heat Pump Parameters during 3 Years of Operation." Applied Mechanics and Materials 659 (October 2014): 487–92. http://dx.doi.org/10.4028/www.scientific.net/amm.659.487.

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The manuscript presents results of a 3 years experiment, concerning in the monitoring of working parameters of a ground – water heat pump with horizontal collectors. The measured working parameters of the refrigerant circuit are: evaporating pressure, condensing pressure, superheating temperature, discharge temperature, sub cooling temperature. There were also measured the flow rate and the temperatures on the heating circuit of water and on the horizontal collectors circuit with antifreeze. The methodology of data processing, described in the manuscript, allowed calculation of evaporating tem

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34

Morklianyk, B. V., B. Ye Brezden, and P. O. Protsenko. "TECHNICAL AND ECONOMIC DESIGN PRINCIPLES OF HEAT PUMPS WITH HORIZONTAL AND VERTICAL COLLECTORS." Scientific Bulletin of UNFU 26, no. 7 (2016): 272–77. http://dx.doi.org/10.15421/40260744.

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Contreras, Ernesto Enciso, Jesús de la Cruz Alejo, Juan Gabriel Barbosa Saldaña, Irving Cardel Alcocer Guillermo, and José Carlos Alejandro Aguilar Anastasio. "Direct Steam Generation Methodology in Horizontal Tubes for Parabolic Trough Solar Collectors Designing." Revista de Gestão Social e Ambiental 18, no. 10 (2024): e09184. http://dx.doi.org/10.24857/rgsa.v18n10-160.

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Purpose: The present work has the objective to describe the methodology that is been carried out for the optimization of a computational tool for Parabolic Trough Solar Collector (PTC) designing and assessment, the optimization is centered in a new section where de solar collector produces steam directly, named Direct Steam Generation (DSG). Theoretical reference: A PTC collector consist of a sheet with parabolic cross section with a high reflectance surface, at the focus of the parabola is placed a tube whose material must have high thermal conductivity, this tube must be recovered by a selec

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36

Montoya-Márquez, Orlando, and José Flores-Prieto. "Heat Removal Factor in Flat Plate Solar Collectors: Indoor Test Method." Energies 11, no. 10 (2018): 2783. http://dx.doi.org/10.3390/en11102783.

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This paper presents a couple of methods to evaluate the heat removal factor FR of flat plate solar collectors, as well as a parametric study of the FR against the tilt angle β, and (Ti − Ta)/G, and its effects on the a0-factor (FRτα) and the a1-factor (FRULmin). The proposed methods were based on indoor flow calorimetry. The first method considers the ratio of the actual useful heat to the maximum useful heat. The second takes into account the slopes of the family of efficiency curves (FRULmin) according to ANSI/ASHRAE 93-2010, and the minimum overall heat loss coefficient, ULmin. In both meth

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Zhao, Chunyu, Shijun You, Hao Gao, and Wei Yu. "Energy conversion performance investigations for a horizontal evacuated tubular collector." International Journal of Numerical Methods for Heat & Fluid Flow 26, no. 1 (2016): 146–58. http://dx.doi.org/10.1108/hff-03-2015-0111.

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Purpose – The purpose of this paper is to use numerical simulations to investigate the energy conversion performance and the flow and temperature structures inside horizontal tubes connected to a vertical manifold channel. Design/methodology/approach – The simulations are performed for different flow rates and inlet temperatures using CFD. Findings – In both the “flowing wind mode” and “upwind mode,” the inlet velocity is not infinitely small under the influence of natural convection; however, such small inlet velocities cannot be achieved in practice and are of no practical significance. In t

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Kong, Li, Yunpeng Zhang, Zhijian Lin, Zhongzhu Qiu, Chunying Li, and Ping Le. "Optimal design of the solar tracking system of parabolic trough concentrating collectors." International Journal of Low-Carbon Technologies 15, no. 4 (2020): 613–19. http://dx.doi.org/10.1093/ijlct/ctaa065.

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Abstract The present work aimed to select the optimum solar tracking mode for parabolic trough concentrating collectors using numerical simulation. The current work involved: (1) the calculation of daily solar radiation on the Earth’s surface, (2) the comparison of annual direct solar radiation received under different tracking modes and (3) the determination of optimum tilt angle for the north-south tilt tracking mode. It was found that the order of solar radiation received in Shanghai under the available tracking modes was: dual-axis tracking &gt; north-south Earth’s axis tracking &g

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Azhar Ali Khan, Muhammad, and Baqir Muhammad. "Spatial comparative analysis of parabolic trough collectors and photovoltaic systems in Saudi Arabia." World Journal of Engineering 13, no. 4 (2016): 300–310. http://dx.doi.org/10.1108/wje-08-2016-041.

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Purpose The aim of this study is to develop a mathematical model for solar power generation system which starts with the quantification of solar resources on different characteristic surfaces at any location. Design/methodology/approach This study is based on a detailed quantitative analysis of solar potential at three different cities of Saudi Arabia: Riyadh, Mecca and Sharura. Direct normal insolation is calculated for one-axis tracking surfaces with rotation about East–West (EW) and North–South (NS) horizontal axes, a two-axes tracking surface and a fixed surface tilted at the latitude of e

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Savicki, D. L., and H. A. Vielmo. "NUMERICAL SIMULATION OF WATER CIRCULATION IN A CYLINDRICAL HORIZONTAL THERMAL TANK." Revista de Engenharia Térmica 8, no. 1 (2009): 72. http://dx.doi.org/10.5380/reterm.v8i1.61885.

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It is carried out a numerical study of the three-dimensional temperature and velocity fields in a cylindrical horizontal thermal tank during the process of water circulation. The numerical simulations were made using an academic Finite Volumes numerical code. This simulation considers that the thermal tank is connected to solar collectors. So, in the tank, the inlet jet temperature is higher than those inside the tank. This study aims to investigate the influence of the inlet jet on thermal stratification. The results show that for the mass flow rate studied, there is no significant variation

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Huneeus, Francisco. "Ante a intempérie existencial: vertical ou horizontal?" PHENOMENOLOGICAL STUDIES - Revista da Abordagem Gestáltica 14, no. 1 (2008): 111–17. http://dx.doi.org/10.18065/rag.2008v14n1.15.

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Our vocation as existentialists possibly comes, just as Perls, from a disillusion before the existing psychotherapeutic systems. Gestalt and its proposal responds to a growth of what possibly was the conscience state prevailing during 99% of our existence as a species on earth, in which time we were nomad hunters-collectors until the late Paleolithic of almost 35 thousand years which M. Berman calls the paradox and characterizes it by an alert animal state, a phenomenological perception of ground, an absolute respect by the natural world and its processes, an existential and horizontal conce

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Wong, Colin L. Y., and Willy Zawadzki. "Emissions rate measurement with flow modelling to optimize landfill gas collection from horizontal collectors." Waste Management 157 (February 2023): 199–209. http://dx.doi.org/10.1016/j.wasman.2022.12.018.

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Pan, Yi Jun, Chien Kuo Yen, Feng Wei Cheng, Wen Hao Hsing, and Wei Sheng Chuang. "Uniformity of Nanofiber Alignment by Electrospinning." Advanced Materials Research 287-290 (July 2011): 2635–39. http://dx.doi.org/10.4028/www.scientific.net/amr.287-290.2635.

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Electrospinning of polyacrylonitrile was used to investigate the effect of horizontal vs. vertical fiber deposition methods and operating variables on the degree of nanofiber alignment. A high-speed camera and Fiji image analysis software were used to assess differences and changes in the degree of fiber parallelism, allowing for effective analysis of the impact of operating variables on fiber parallel alignment. The results show that the strength of the electric field affects the fibers to assume a parallel alignment. Too weak the electric field, the fibers are unable to form a straight bundl

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Ji, Xu, Ming Li, Weidong Lin, Tufeng Zheng, and Yunfeng Wang. "Effect of Installation of Solar Collector on Performance of Balcony Split Type Solar Water Heaters." International Journal of Photoenergy 2015 (2015): 1–9. http://dx.doi.org/10.1155/2015/865041.

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The influences of surface orientation and slope of solar collectors on solar radiation collection of balcony split type solar water heaters for six cities in China were analyzed by employing software TRNSYS. The surface azimuth had greater effect on solar radiation collection in high latitude regions. For deviation of the surface slope angle within ±20° around the optimized angle, the variation of the total annual collecting solar radiation was less than 5%. However, with deviation of 70° to 90°, the variation was up to 20%. The effects of water cycle mode, reverse slope placement of solar col

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Romashchenko, M. I., D. P. Savchuk, A. M. Shevchenko, O. A. Babitska, O. I. Kharlamov, and I. V. Kotykovych. "PROTECTION OF TERRITORIES FROM WATERLOGGING IN THE ZONE OF THE NORTH CRIMEAN CANAL OF KHERSON REGION AND WAYS TO IMPROVE IT." Міжвідомчий тематичний науковий збірник "Меліорація і водне господарство", no. 2 (December 21, 2022): 65–74. http://dx.doi.org/10.31073/mivg202202-342.

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The system of protecting territories from the harmful effects of water using vertical drainage in the zone of the North Crimean Canal of the Kherson region was considered and the proposals for its improvement by creating additional horizontal drainage systems with gravity drainage were substantiated. Field drainage studies were carried out at 8 research and production sites with a total area of 4763 hectares and a term of operation of 48-55 years and more. The conducted studies included surveying the drainage in the areas, measuring the drainage flow and the depth of groundwater levels, and de

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Abdiev, Umirbek Begmatovich, and Boysori Abdikholikovich Yuldoshov. "INSPECTION ELECTRICAL AND HEAT PARAMETERS OF PHOTOVOLTAIC-THERMAL BATTERY, STUDYING THE EFFECTS OF POLLUTION." Scientific Reports of Bukhara State University 5, no. 5 (2021): 2–20. http://dx.doi.org/10.52297/2181-1466/2021/5/5/1.

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Introduction. The article discusses increasing the intensity of light incident on the surface of a photovoltaic battery (PVB) based on semiconductor solar battery, methods of cooling the PVB and protecting the surface from contamination have been investigated. To do this, the PVB is the planes that reflect light to the long sides, and a polycarbonate collector with a parallel channel on the back, this device looks like a photovoltaic-thermal battery (PVT). The article presents the results of the study of electrical and thermal parameters of PVT when changing (increasing) the intensity of solar

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Mazurek, Gustaw. "Estimation of Solar Irradiation on Inclined Surface Based on Web Databases." International Journal of Electronics and Telecommunications 60, no. 4 (2014): 315–20. http://dx.doi.org/10.2478/eletel-2014-0041.

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Abstract Estimation of Global Tilted Irradiation (GTI) is a key to performance assessment of typical solar systems since they usually employ tilted photovoltaic (PV) modules or collectors. Numerous solar radiation databases can deliver irradiation values both on horizontal and tilted plane, however they are validated mostly with horizontal-plane ground measurements. In this paper we have compared GTI estimates retrieved from five Internet databases with results of measurements at two PV systems located in Poland. Our work shows that in spite of good agreement in annual scale, there is a tenden

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Wądołowska, Bernadetta, and Dorota Anna Krawczyk. "Analysis of the Advisability of Using Solar Collectors in a Single-Family House in Poland and Spain." Proceedings 51, no. 1 (2020): 9. http://dx.doi.org/10.3390/proceedings2020051009.

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In this paper we show the advisability of usage of solar collectors for domestic hot water (DHW) preparation in buildings located in two countries: Poland and Spain. The analysis was conducted for a single-family house with horizontal roof. During the calculations we took into account factors depending on the building location such as national rules, climatic conditions, cost of system installation, and fuel and electricity prices. Based on the total design heat losses and demand for DHW, the demand for usable energy for heating the buildings and DHW preparation was calculated. A gas boiler wa

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Liu, Xin, Enshen Long, and Jin Li. "Comparison and Mechanism Study on the Difference of Collecting Performance of Horizontal and Vertical Evacuated Collectors." IOP Conference Series: Earth and Environmental Science 310 (September 5, 2019): 022079. http://dx.doi.org/10.1088/1755-1315/310/2/022079.

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Eck, M., R. Uhlig, M. Mertins, A. Häberle, and H. Lerchenmüller. "Thermal Load of Direct Steam-Generating Absorber Tubes with Large Diameter in Horizontal Linear Fresnel Collectors." Heat Transfer Engineering 28, no. 1 (2007): 42–48. http://dx.doi.org/10.1080/01457630600985659.

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