Publisher: Springer-Verlag (Total: 2626 journals)

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Showing 1 - 200 of 2626 Journals sorted alphabetically
3D Printing in Medicine     Open Access   (Followers: 5)
3D Research     Hybrid Journal   (Followers: 21, SJR: 0.222, CiteScore: 1)
4OR: A Quarterly J. of Operations Research     Hybrid Journal   (Followers: 13, SJR: 0.825, CiteScore: 1)
AAPS J.     Hybrid Journal   (Followers: 32, SJR: 1.118, CiteScore: 4)
AAPS PharmSciTech     Hybrid Journal   (Followers: 9, SJR: 0.752, CiteScore: 3)
Abdominal Radiology     Hybrid Journal   (Followers: 22, SJR: 0.866, CiteScore: 2)
Abhandlungen aus dem Mathematischen Seminar der Universitat Hamburg     Hybrid Journal   (Followers: 4, SJR: 0.439, CiteScore: 0)
aBIOTECH : An Intl. J. on Plant Biotechnology and Agricultural Sciences     Hybrid Journal   (Followers: 2)
Academic Psychiatry     Full-text available via subscription   (Followers: 32, SJR: 0.53, CiteScore: 1)
Academic Questions     Hybrid Journal   (Followers: 9, SJR: 0.106, CiteScore: 0)
Accreditation and Quality Assurance: J. for Quality, Comparability and Reliability in Chemical Measurement     Hybrid Journal   (Followers: 34, SJR: 0.316, CiteScore: 1)
Acoustical Physics     Hybrid Journal   (Followers: 12, SJR: 0.359, CiteScore: 1)
Acoustics Australia     Hybrid Journal   (Followers: 2, SJR: 0.232, CiteScore: 1)
Acta Analytica     Hybrid Journal   (Followers: 7, SJR: 0.367, CiteScore: 0)
Acta Applicandae Mathematicae     Hybrid Journal   (Followers: 1, SJR: 0.675, CiteScore: 1)
Acta Biotheoretica     Hybrid Journal   (Followers: 3, SJR: 0.284, CiteScore: 1)
Acta Diabetologica     Hybrid Journal   (Followers: 19, SJR: 1.587, CiteScore: 3)
Acta Endoscopica     Hybrid Journal   (Followers: 1)
acta ethologica     Hybrid Journal   (Followers: 4, SJR: 0.769, CiteScore: 1)
Acta Geochimica     Hybrid Journal   (Followers: 8, SJR: 0.24, CiteScore: 1)
Acta Geodaetica et Geophysica     Hybrid Journal   (Followers: 3, SJR: 0.305, CiteScore: 1)
Acta Geophysica     Hybrid Journal   (Followers: 11, SJR: 0.312, CiteScore: 1)
Acta Geotechnica     Hybrid Journal   (Followers: 7, SJR: 1.588, CiteScore: 3)
Acta Informatica     Hybrid Journal   (Followers: 5, SJR: 0.517, CiteScore: 1)
Acta Mathematica     Hybrid Journal   (Followers: 13, SJR: 7.066, CiteScore: 3)
Acta Mathematica Hungarica     Hybrid Journal   (Followers: 2, SJR: 0.452, CiteScore: 1)
Acta Mathematica Sinica, English Series     Hybrid Journal   (Followers: 6, SJR: 0.379, CiteScore: 1)
Acta Mathematica Vietnamica     Hybrid Journal   (SJR: 0.27, CiteScore: 0)
Acta Mathematicae Applicatae Sinica, English Series     Hybrid Journal   (SJR: 0.208, CiteScore: 0)
Acta Mechanica     Hybrid Journal   (Followers: 25, SJR: 1.04, CiteScore: 2)
Acta Mechanica Sinica     Hybrid Journal   (Followers: 5, SJR: 0.607, CiteScore: 2)
Acta Metallurgica Sinica (English Letters)     Hybrid Journal   (Followers: 9, SJR: 0.576, CiteScore: 2)
Acta Meteorologica Sinica     Hybrid Journal   (Followers: 3, SJR: 0.638, CiteScore: 1)
Acta Neurochirurgica     Hybrid Journal   (Followers: 7, SJR: 0.822, CiteScore: 2)
Acta Neurologica Belgica     Hybrid Journal   (Followers: 3, SJR: 0.376, CiteScore: 1)
Acta Neuropathologica     Hybrid Journal   (Followers: 5, SJR: 7.589, CiteScore: 12)
Acta Oceanologica Sinica     Hybrid Journal   (Followers: 3, SJR: 0.334, CiteScore: 1)
Acta Physiologiae Plantarum     Hybrid Journal   (Followers: 4, SJR: 0.574, CiteScore: 2)
Acta Politica     Hybrid Journal   (Followers: 19, SJR: 0.605, CiteScore: 1)
Activitas Nervosa Superior     Hybrid Journal   (SJR: 0.147, CiteScore: 0)
Adaptive Human Behavior and Physiology     Hybrid Journal   (Followers: 1)
adhäsion KLEBEN & DICHTEN     Hybrid Journal   (Followers: 9, SJR: 0.103, CiteScore: 0)
ADHD Attention Deficit and Hyperactivity Disorders     Hybrid Journal   (Followers: 28, SJR: 0.72, CiteScore: 2)
Adhesion Adhesives & Sealants     Hybrid Journal   (Followers: 11)
Administration and Policy in Mental Health and Mental Health Services Research     Partially Free   (Followers: 21, SJR: 1.005, CiteScore: 2)
Adolescent Research Review     Hybrid Journal   (Followers: 2)
Adsorption     Hybrid Journal   (Followers: 5, SJR: 0.703, CiteScore: 2)
Advanced Composites and Hybrid Materials     Hybrid Journal  
Advanced Fiber Materials     Full-text available via subscription  
Advances in Applied Clifford Algebras     Hybrid Journal   (Followers: 4, SJR: 0.698, CiteScore: 1)
Advances in Astronautics Science and Technology     Hybrid Journal  
Advances in Atmospheric Sciences     Hybrid Journal   (Followers: 42, SJR: 0.956, CiteScore: 2)
Advances in Computational Mathematics     Hybrid Journal   (Followers: 23, SJR: 0.812, CiteScore: 1)
Advances in Contraception     Hybrid Journal   (Followers: 3)
Advances in Data Analysis and Classification     Hybrid Journal   (Followers: 57, SJR: 1.09, CiteScore: 1)
Advances in Gerontology     Partially Free   (Followers: 8, SJR: 0.144, CiteScore: 0)
Advances in Health Sciences Education     Hybrid Journal   (Followers: 36, SJR: 1.64, CiteScore: 2)
Advances in Manufacturing     Hybrid Journal   (Followers: 5, SJR: 0.475, CiteScore: 2)
Advances in Neurodevelopmental Disorders     Hybrid Journal   (Followers: 2)
Advances in Operator Theory     Hybrid Journal   (Followers: 4)
Advances in Polymer Science     Hybrid Journal   (Followers: 50, SJR: 1.04, CiteScore: 3)
Advances in Therapy     Hybrid Journal   (Followers: 5, SJR: 1.075, CiteScore: 3)
Advances in Traditional Medicine     Hybrid Journal   (Followers: 4)
Adversity and Resilience Science : J. of Research and Practice     Hybrid Journal   (Followers: 3)
Aegean Review of the Law of the Sea and Maritime Law     Hybrid Journal   (Followers: 9)
Aequationes Mathematicae     Hybrid Journal   (Followers: 2, SJR: 0.517, CiteScore: 1)
Aerobiologia     Hybrid Journal   (Followers: 4, SJR: 0.673, CiteScore: 2)
Aerosol Science and Engineering     Hybrid Journal  
Aerospace Systems     Hybrid Journal   (Followers: 1)
Aerotecnica Missili & Spazio : J. of Aerospace Science, Technologies & Systems     Hybrid Journal  
Aesthetic Plastic Surgery     Hybrid Journal   (Followers: 12, SJR: 0.825, CiteScore: 1)
Affective Science     Hybrid Journal   (Followers: 2)
African Archaeological Review     Hybrid Journal   (Followers: 20, SJR: 0.862, CiteScore: 1)
Afrika Matematika     Hybrid Journal   (Followers: 3, SJR: 0.235, CiteScore: 0)
Ageing Intl.     Hybrid Journal   (Followers: 8, SJR: 0.39, CiteScore: 1)
Aggiornamenti CIO     Hybrid Journal   (Followers: 1)
Aging Clinical and Experimental Research     Hybrid Journal   (Followers: 3, SJR: 0.67, CiteScore: 2)
Agricultural Research     Hybrid Journal   (Followers: 7, SJR: 0.276, CiteScore: 1)
Agriculture and Human Values     Open Access   (Followers: 15, SJR: 1.173, CiteScore: 3)
Agroforestry Systems     Open Access   (Followers: 20, SJR: 0.663, CiteScore: 1)
Agronomy for Sustainable Development     Open Access   (Followers: 19, SJR: 1.864, CiteScore: 6)
AI & Society     Hybrid Journal   (Followers: 9, SJR: 0.227, CiteScore: 1)
AIDS and Behavior     Hybrid Journal   (Followers: 18, SJR: 1.792, CiteScore: 3)
Air Quality, Atmosphere & Health     Hybrid Journal   (Followers: 7, SJR: 0.862, CiteScore: 3)
Akupunktur & Aurikulomedizin     Full-text available via subscription   (Followers: 1)
Algebra and Logic     Hybrid Journal   (Followers: 7, SJR: 0.531, CiteScore: 0)
Algebra Universalis     Hybrid Journal   (Followers: 2, SJR: 0.583, CiteScore: 1)
Algebras and Representation Theory     Hybrid Journal   (Followers: 1, SJR: 1.095, CiteScore: 1)
Algorithmica     Hybrid Journal   (Followers: 9, SJR: 0.56, CiteScore: 1)
Allergo J.     Full-text available via subscription   (Followers: 2, SJR: 0.234, CiteScore: 0)
Allergo J. Intl.     Hybrid Journal   (Followers: 2)
Alpine Botany     Hybrid Journal   (Followers: 5, SJR: 1.11, CiteScore: 3)
ALTEX : Alternatives to Animal Experimentation     Open Access   (Followers: 2)
AMBIO     Hybrid Journal   (Followers: 9, SJR: 1.569, CiteScore: 4)
American J. of Cardiovascular Drugs     Hybrid Journal   (Followers: 18, SJR: 0.951, CiteScore: 3)
American J. of Community Psychology     Hybrid Journal   (Followers: 32, SJR: 1.329, CiteScore: 2)
American J. of Criminal Justice     Hybrid Journal   (Followers: 10, SJR: 0.772, CiteScore: 1)
American J. of Cultural Sociology     Hybrid Journal   (Followers: 22, SJR: 0.46, CiteScore: 1)
American J. of Dance Therapy     Hybrid Journal   (Followers: 9, SJR: 0.181, CiteScore: 0)
American J. of Potato Research     Hybrid Journal   (Followers: 3, SJR: 0.611, CiteScore: 1)
American J. of Psychoanalysis     Hybrid Journal   (Followers: 22, SJR: 0.314, CiteScore: 0)
American Sociologist     Hybrid Journal   (Followers: 16, SJR: 0.35, CiteScore: 0)
Amino Acids     Hybrid Journal   (Followers: 7, SJR: 1.135, CiteScore: 3)
AMS Review     Partially Free   (Followers: 4)
Analog Integrated Circuits and Signal Processing     Hybrid Journal   (Followers: 11, SJR: 0.211, CiteScore: 1)
Analysis and Mathematical Physics     Hybrid Journal   (Followers: 6, SJR: 0.536, CiteScore: 1)
Analysis in Theory and Applications     Hybrid Journal   (Followers: 1)
Analysis of Verbal Behavior     Hybrid Journal   (Followers: 6)
Analytical and Bioanalytical Chemistry     Hybrid Journal   (Followers: 32, SJR: 0.978, CiteScore: 3)
Anatomical Science Intl.     Hybrid Journal   (Followers: 3, SJR: 0.367, CiteScore: 1)
Angewandte Schmerztherapie und Palliativmedizin     Hybrid Journal  
Angiogenesis     Hybrid Journal   (Followers: 3, SJR: 2.177, CiteScore: 5)
Animal Cognition     Hybrid Journal   (Followers: 23, SJR: 1.389, CiteScore: 3)
Annales françaises de médecine d'urgence     Hybrid Journal   (Followers: 1, SJR: 0.192, CiteScore: 0)
Annales Henri Poincaré     Hybrid Journal   (Followers: 3, SJR: 1.097, CiteScore: 2)
Annales mathématiques du Québec     Hybrid Journal   (Followers: 4, SJR: 0.438, CiteScore: 0)
Annali dell'Universita di Ferrara     Hybrid Journal   (SJR: 0.429, CiteScore: 0)
Annali di Matematica Pura ed Applicata     Hybrid Journal   (Followers: 1, SJR: 1.197, CiteScore: 1)
Annals of Biomedical Engineering     Hybrid Journal   (Followers: 19, SJR: 1.042, CiteScore: 3)
Annals of Combinatorics     Hybrid Journal   (Followers: 4, SJR: 0.932, CiteScore: 1)
Annals of Data Science     Hybrid Journal   (Followers: 13)
Annals of Dyslexia     Hybrid Journal   (Followers: 11, SJR: 0.85, CiteScore: 2)
Annals of Finance     Hybrid Journal   (Followers: 37, SJR: 0.579, CiteScore: 1)
Annals of Forest Science     Hybrid Journal   (Followers: 7, SJR: 0.986, CiteScore: 2)
Annals of Functional Analysis     Hybrid Journal   (Followers: 4)
Annals of Global Analysis and Geometry     Hybrid Journal   (Followers: 1, SJR: 1.228, CiteScore: 1)
Annals of Hematology     Hybrid Journal   (Followers: 15, SJR: 1.043, CiteScore: 2)
Annals of Mathematics and Artificial Intelligence     Hybrid Journal   (Followers: 14, SJR: 0.413, CiteScore: 1)
Annals of Microbiology     Hybrid Journal   (Followers: 13, SJR: 0.479, CiteScore: 2)
Annals of Nuclear Medicine     Hybrid Journal   (Followers: 4, SJR: 0.687, CiteScore: 2)
Annals of Operations Research     Hybrid Journal   (Followers: 11, SJR: 0.943, CiteScore: 2)
Annals of Ophthalmology     Hybrid Journal   (Followers: 14)
Annals of PDE     Hybrid Journal   (Followers: 1)
Annals of Regional Science     Hybrid Journal   (Followers: 9, SJR: 0.614, CiteScore: 1)
Annals of Software Engineering     Hybrid Journal   (Followers: 13)
Annals of Solid and Structural Mechanics     Hybrid Journal   (Followers: 11, SJR: 0.239, CiteScore: 1)
Annals of Surgical Oncology     Hybrid Journal   (Followers: 19, SJR: 1.986, CiteScore: 4)
Annals of Telecommunications     Hybrid Journal   (Followers: 8, SJR: 0.223, CiteScore: 1)
Annals of the Institute of Statistical Mathematics     Hybrid Journal   (Followers: 1, SJR: 1.495, CiteScore: 1)
Antonie van Leeuwenhoek     Hybrid Journal   (Followers: 5, SJR: 0.834, CiteScore: 2)
Apidologie     Hybrid Journal   (Followers: 5, SJR: 1.22, CiteScore: 3)
APOPTOSIS     Hybrid Journal   (Followers: 9, SJR: 1.424, CiteScore: 4)
Applicable Algebra in Engineering, Communication and Computing     Hybrid Journal   (Followers: 3, SJR: 0.294, CiteScore: 1)
Applications of Mathematics     Hybrid Journal   (Followers: 3, SJR: 0.602, CiteScore: 1)
Applied Biochemistry and Biotechnology     Hybrid Journal   (Followers: 42, SJR: 0.571, CiteScore: 2)
Applied Biochemistry and Microbiology     Hybrid Journal   (Followers: 20, SJR: 0.21, CiteScore: 1)
Applied Categorical Structures     Hybrid Journal   (Followers: 4, SJR: 0.49, CiteScore: 0)
Applied Composite Materials     Hybrid Journal   (Followers: 53, SJR: 0.58, CiteScore: 2)
Applied Entomology and Zoology     Partially Free   (Followers: 7, SJR: 0.422, CiteScore: 1)
Applied Geomatics     Hybrid Journal   (Followers: 3, SJR: 0.733, CiteScore: 3)
Applied Geophysics     Hybrid Journal   (Followers: 11, SJR: 0.488, CiteScore: 1)
Applied Intelligence     Hybrid Journal   (Followers: 15, SJR: 0.6, CiteScore: 2)
Applied Magnetic Resonance     Hybrid Journal   (Followers: 4, SJR: 0.319, CiteScore: 1)
Applied Mathematics & Optimization     Hybrid Journal   (Followers: 10, SJR: 0.886, CiteScore: 1)
Applied Mathematics - A J. of Chinese Universities     Hybrid Journal   (Followers: 1, SJR: 0.17, CiteScore: 0)
Applied Mathematics and Mechanics     Hybrid Journal   (Followers: 5, SJR: 0.461, CiteScore: 1)
Applied Microbiology and Biotechnology     Hybrid Journal   (Followers: 70, SJR: 1.182, CiteScore: 4)
Applied Physics A     Hybrid Journal   (Followers: 11, SJR: 0.481, CiteScore: 2)
Applied Physics B: Lasers and Optics     Hybrid Journal   (Followers: 27, SJR: 0.74, CiteScore: 2)
Applied Psychophysiology and Biofeedback     Hybrid Journal   (Followers: 8, SJR: 0.519, CiteScore: 2)
Applied Research in Quality of Life     Hybrid Journal   (Followers: 12, SJR: 0.316, CiteScore: 1)
Applied Solar Energy     Hybrid Journal   (Followers: 21, SJR: 0.225, CiteScore: 0)
Applied Spatial Analysis and Policy     Hybrid Journal   (Followers: 6, SJR: 0.542, CiteScore: 1)
Aquaculture Intl.     Hybrid Journal   (Followers: 26, SJR: 0.591, CiteScore: 2)
Aquarium Sciences and Conservation     Hybrid Journal   (Followers: 2)
Aquatic Ecology     Hybrid Journal   (Followers: 38, SJR: 0.656, CiteScore: 2)
Aquatic Geochemistry     Hybrid Journal   (Followers: 3, SJR: 0.591, CiteScore: 1)
Aquatic Sciences     Hybrid Journal   (Followers: 14, SJR: 1.109, CiteScore: 3)
Arabian J. for Science and Engineering     Hybrid Journal   (Followers: 5, SJR: 0.303, CiteScore: 1)
Arabian J. of Geosciences     Hybrid Journal   (Followers: 2, SJR: 0.319, CiteScore: 1)
Archaeological and Anthropological Sciences     Hybrid Journal   (Followers: 24, SJR: 1.052, CiteScore: 2)
Archaeologies     Hybrid Journal   (Followers: 13, SJR: 0.224, CiteScore: 0)
Archiv der Mathematik     Hybrid Journal   (Followers: 1, SJR: 0.725, CiteScore: 1)
Archival Science     Hybrid Journal   (Followers: 70, SJR: 0.745, CiteScore: 2)
Archive for History of Exact Sciences     Hybrid Journal   (Followers: 7, SJR: 0.186, CiteScore: 1)
Archive for Mathematical Logic     Hybrid Journal   (Followers: 3, SJR: 0.909, CiteScore: 1)
Archive for Rational Mechanics and Analysis     Hybrid Journal   (Followers: 1, SJR: 3.93, CiteScore: 3)
Archive of Applied Mechanics     Hybrid Journal   (Followers: 6, SJR: 0.79, CiteScore: 2)
Archives and Museum Informatics     Hybrid Journal   (Followers: 184, SJR: 0.101, CiteScore: 0)
Archives of Computational Methods in Engineering     Hybrid Journal   (Followers: 6, SJR: 1.41, CiteScore: 5)
Archives of Dermatological Research     Hybrid Journal   (Followers: 7, SJR: 1.006, CiteScore: 2)
Archives of Environmental Contamination and Toxicology     Hybrid Journal   (Followers: 14, SJR: 0.773, CiteScore: 2)
Archives of Gynecology and Obstetrics     Hybrid Journal   (Followers: 19, SJR: 0.956, CiteScore: 2)
Archives of Microbiology     Hybrid Journal   (Followers: 10, SJR: 0.644, CiteScore: 2)
Archives of Orthopaedic and Trauma Surgery     Hybrid Journal   (Followers: 10, SJR: 1.146, CiteScore: 2)
Archives of Osteoporosis     Hybrid Journal   (Followers: 2, SJR: 0.71, CiteScore: 2)
Archives of Sexual Behavior     Hybrid Journal   (Followers: 12, SJR: 1.493, CiteScore: 3)
Archives of Toxicology     Hybrid Journal   (Followers: 19, SJR: 1.541, CiteScore: 5)
Archives of Virology     Hybrid Journal   (Followers: 5, SJR: 0.973, CiteScore: 2)
Archives of Women's Mental Health     Hybrid Journal   (Followers: 18, SJR: 1.274, CiteScore: 3)
Archivio di Ortopedia e Reumatologia     Hybrid Journal  
Archivum Immunologiae et Therapiae Experimentalis     Hybrid Journal   (Followers: 2, SJR: 0.946, CiteScore: 3)
ArgoSpine News & J.     Hybrid Journal  
Argumentation     Hybrid Journal   (Followers: 6, SJR: 0.349, CiteScore: 1)
Arid Ecosystems     Hybrid Journal   (Followers: 3, SJR: 0.2, CiteScore: 0)
Arkiv för Matematik     Hybrid Journal   (Followers: 1, SJR: 0.766, CiteScore: 1)
arktos : The J. of Arctic Geosciences     Hybrid Journal  
Arnold Mathematical J.     Hybrid Journal   (Followers: 1, SJR: 0.355, CiteScore: 0)
Arthropod-Plant Interactions     Hybrid Journal   (Followers: 2, SJR: 0.839, CiteScore: 2)
Arthroskopie     Hybrid Journal   (Followers: 1, SJR: 0.131, CiteScore: 0)

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Similar Journals
Journal Cover
Applied Solar Energy
Journal Prestige (SJR): 0.225
Number of Followers: 21  
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 1934-9424 - ISSN (Online) 0003-701X
Published by Springer-Verlag Homepage  [2626 journals]
  • Fabrication of Thin-Film Solar Cells Based on CdTe Films and Investigation
           of Their Photoelectrical Properties
    • Abstract: This study presents the results of investigating thin-film CdS/CdTe-based solar cells obtained on glass substrates with In2O3(Sn) and SnO2 frontal electrodes. On the surface of frontal electrodes (In2O3(Sn)/SnO2), 100-nm thick cadmium sulfide films were deposited by vacuum thermal evaporation at a substrate temperature of 200°C, then application of 4–5-μm thick cadmium telluride films by chemical molecular beam deposition at a substrate temperature of 600°C. The obtained heterosystems were subjected to “chloride” treatment, which is a standard technological operation for the fabrication of efficient solar cells based on CdS/CdTe. Photoelectrical characteristics of the resulting solar cells were studied. An increase in the efficiency of thin-film solar cells after heat treatment was shown.
      PubDate: 2020-03-01
  • Increasing the Convective Heat Transfer Coefficient Inside Heat Removal
           Channels of Sheet-Piped Light-Absorbing Panels of Flat-Plate Solar
           Collectors in the Laminar Flow Regime of Heat Transfer Fluid
    • Abstract: — The study presents ways to improve convective heat transfer inside heat removal channels of light-absorbing heat-exchange panels of flat-plate solar water heating collectors in laminar viscous and viscous gravity modes of the heat transfer fluid flow by affecting the thermal boundary layer formed on the inner surfaces of their walls.
      PubDate: 2020-03-01
  • A Study of the Parameters of a Combined Photo-Thermoelectric Installation
           under Field Conditions
    • Abstract: The parameters of a combined photo-thermoelectric installation based on modern solar cells (SCs) made of polycrystalline silicon and thermoelectric batteries (TBs) based on bismuth telluride with improved thermal contacts were experimentally investigated. The heating and cooling of the photovoltaic section of the installation were studied. Analysis of the photographs of infrared radiation obtained during the heating indicates that all surfaces are nonuniform in terms of the temperature. The white spots partially observable in the central parts of photovoltaic batteries (PVBs) suggest a high temperature, i.e., the process of “overheating”. After cooling the cold junction of the thermoelectric battery with water below room temperature, a significant change in the temperature gradient of the PVB and partial restoration of the basic parameters of the PVB were observed. The inhomogeneity of the temperature gradient over the PVB surface is apparently caused by uneven removal of heat from the front surface to the back of the battery. Based on the obtained experimental data, comparative graphs of the parameters of the combined photo-thermoelectric installation with and without a reflector were constructed.
      PubDate: 2020-03-01
  • Monitoring System for Small-Scale Photovoltaic Plants
    • Abstract: – This study presents the results of research aimed at developing and creating a monitoring system for solar photovoltaic power plants; this system would allow measuring values of key output parameters (generated power, current and voltage, photovoltaic module, and ambient temperatures). The presented monitoring system consists of a measuring device, a computer, a shunt, and thermal sensors. The measuring device was made on the basis of an STM32F415RGT6 microcontroller. It is shown that an operational amplifier with a programmable gain can be used in which the gain can be changed via the SPI interface to 1, 2, 3, 4, 5, 8, 10, 12, 16, or 32. When high and low voltages are measured, this gain is programmatically switched to lower and, vice versa, higher levels. This makes it possible to measure the voltage smoothly in the entire range to high precision and without manual switching. The DS18B20 temperature sensors are used to measure the temperature from –55 to 125ºC. Several programs based on C++Builder are developed to display graphs and the MySQL database and save the measurement results on a computer. Every 15 min the software collects data from the measuring device, displays them in the form of tables, graphs, and also records and stores the data in a MySQL database for further processing and analysis.
      PubDate: 2020-03-01
  • Unity Efficiency and Zero-Oscillations Based MPPT for Photovoltaic Systems
    • Abstract: Maximum power point tracking (MPPT) is essential for photovoltaic systems to ensure a maximum power extraction from PV panels. However, some issues such as oscillations, power loss and other technical aspects still unsolved. This paper presents and discusses a new MPPT algorithm with zero-oscillations and unity efficiency in transient and steady-states. This algorithm leads to track the maximum power point under extreme operating conditions. The proposed MPPT method is based on the simple adaptive linear neuron. In addition, its implementation is achieved without any additional control loop, which resulted in a simple control. In order to validate the proposal effectiveness, both simulation and experiment tests are carried out under variable irradiance and load. Comparison between the developed MPPT and the conventional perturb and observe algorithm is also performed. Obtained results show that with the proposed method, unity efficiency is reached and oscillations are fully removed in the transient and steady-states. The originality of this work is the design of a simple and efficient MPPT algorithm based on the ADALINE with unity efficiency and zero-oscillations. Moreover, the proposal is verified using a real PV system under irradiance and load changes.
      PubDate: 2020-03-01
  • Determination of Power Flows in Microgrids with Renewable Energy Sources
           by Using Special Computer Programs
    • Abstract: — The article discusses the issues of determining power flows in micro networks with renewable energy sources by using the Electrical Transient Analyzer Program (ETAP) software. In the model, the sources of electrical energy are: photovoltaic, microhydroelectric power stations, wind and other types of stations, as well as the main electric network. Using ETAP software, various experiments were conducted for the modes of the selected microgrid scheme and their results were obtained.
      PubDate: 2020-03-01
  • Ultraviolet Concentration Factor of a Truncated Compound Parabolic
           Concentrator under Different Weather Conditions
    • Abstract: — This study presents the results of ultraviolet radiation measurement in a truncated compound parabolic concentrator. The measurements were performed by using of a portable ultraviolet sensor both inside and outside the concentrator without the presence of receiver, under direct and diffuse solar radiation, to calculate the real value of the concentration factor of ultraviolet radiation. The truncated compound parabolic concentrator was designed in Solid Works and built via 3D printing, with a theoretical concentration factor of 4.6. This study showed the differences in the form of the ultraviolet radiation when measurements were made under direct radiation and diffuse solar radiation. These differences are important when measurements were made along the concentrator profile, at different heights within the concentrator and, also, along it. Finally, a concentration factor of 3.3 and 1.4 were calculated on a sunny and a cloudy days, respectively. These values correspond to a concentration efficiency of 71.7 and 31.3%, respectively, against the theoretical value of 4.6 proposed in the design.
      PubDate: 2020-03-01
  • Multi-Objective Optimization of Complex Measures on Supplying Energy to
           Rural Residential Buildings in Uzbekistan Using Renewable Energy Sources
    • Abstract: This study presents the first results of multi-objective optimization of typical four-room rural residential buildings in Uzbekistan with different levels of thermal insulation. For that purpose, a simplified static model of buildings based on the heating degree-days has been employed and the optimal designs were found for three scenarios. In the first scenario, the life-cycle cost of the reconstruction measure was analyzed where the optimal thicknesses of the insulation layer were found for the roof, floor, and external walls but no solutions were found for windows, solar collectors, and photovoltaic (PV) panels. In the second scenario, primary energy consumption was minimized to zero for space heating and domestic hot water. In this scenario, the thickness of insulation layers for building envelopes and the size of solar collectors were optimized in various regions. In the final scenario, low carbon communities were considered in technoeconomic conditions of Uzbekistan. However, no optimal solutions were found in the current cost of electricity.
      PubDate: 2020-03-01
  • DC-Current Sensor-Less MPPT Based Grid-Fed Single-Phase Photovoltaic (PV)
    • Abstract: This paper presents grid-feeding type micro-inverter for a single-phase grid-interactive photovoltaic (PV) system. The system comprises of two stages, a step-up DC-DC converter with series resonant type voltage multiplier-a doubler and an inverter operating on single-switch modulation technique in order to improve efficiency of system. Use of single switch-modulating inverter helps in preventing shoot-through problem. The PV current from array is estimated without employing a DC current sensor to make system operate at maximum power point (MPP). A simulation for low power 300 W PV system without DC-current sensor maximum power point tracking (MPPT) control has been carried out to analyze cost effectiveness solution for small power rooftop applications. The simulation has been carried out on MATLAB®/Simulink platform under varying irradiation conditions to verify effectiveness of control technique and ripple present into injected grid current. The total harmonic distortion in grid current has been observed to be less than 5% even at as low as 0.25G irradiation to comply IEEE standards.
      PubDate: 2020-03-01
  • Autonomous Multifunctional Measuring Device for Monitoring the
           Characteristics of Photovoltaic Modules
    • Abstract: The study provides a multifunctional measuring device that searches for the maximum energy output using a certain algorithm and calculates the fill factor and efficiency of a solar module. It also monitors the air temperature and relative humidity, the temperature of the solar module, the level of solar radiation, wind speed, and current and voltage of the solar module. An electrical circuit for measuring the current–voltage characteristic of photovoltaic modules is proposed. In addition, rechargeable batteries allowing measurements without connecting the device to a power supply ensure autonomy of the device. An algorithm is proposed for finding the point of maximum power of a photovoltaic module. The device is developed on the basis of an ATmega2560 microcontroller with additional sensors. The measuring device software sends all acquired data from the device to a computer to be saved in a database.
      PubDate: 2020-03-01
  • Solar Heat Supply in Russia
    • Abstract: While the total installed capacity of the world’s solar heat supply is 480 GW (600 million m2), it is 68 MW in Russia (85 000 m2). The study presents data on five major Soviet scientific solar engineering schools, four research and design institutes, and seven solar collector factories. It mentions the leaders of solar technology in the theoretical foundations (Dr. Sci. (Tech.) B.P. Weinberg), the designs of solar collectors (SCs) (Cand. Sci. (Tech.) B.V. Petukhov), solar thermal units (Dr. Sci. (Tech.) B.V. Tarnizhevskii, Dr. Sci. (Tech.) R.R. Avezov), design (Dr. Sci. (Tech.) M.D. Rabinovich, Cand. Sci. (Tech.) Yu.K. Rashidov). In Russia, research on solar radiation is carried out at the Moscow State University (Dr. Sci. (Tech.) A.A. Solovyev, Cand. Sci. (Econ.) K.S. Degtyarev), Joint Institute for High Temperatures, Russian Academy of Sciences (Dr. Sci. (Tech.) O.S. Popel, Cand. Sci. (Tech.) S.E. Frid), and Kuban Agrarian University (Dr. Sci. (Tech.) V.A. Butuzov). The characteristics of SCs of two major Russian manufacturers are presented: NPO Mashinostroenie (Reutov, Moscow oblast) and NovyPolus (Moscow). Despite the SCs of these manufacturers having close dimensions, they differ in materials and techniques for manufacturing absorbers. The former use copper and aluminum welded absorbers, and the latter use only copper soldered absorbers. The characteristics of air and vacuum SCs of NovyPolus are presented. The study describes the technical solutions of the solar thermal unit (STU) with SCs of the NovyPolus with an area of 240 m2 in the village of Dederkoy in Tuapse in the Krasnodar krai; the cost structure with a payback period of 4.5 years is presented. The paper also presents the technical solutions of the STU with the SCs of NPO Mashinostroenie with an area of 100 m2 in the village of Arkhipo-Osipovka of the Krasnodar krai and the STU with an area of 72 m2 in the Sanatorium settlement of Yalta in the Crimea; the cost structure with a payback period of 7 to 20 years is described.
      PubDate: 2020-03-01
  • Digital Ballast Load Controller for a Small Hydropower Plant
    • Abstract: For small HPPs operating as off-grid low capacity generation facilities, it is advisable to adjust the ballast load capacity for the AC frequency deviation from the nominal value. At present, there are two practical circuit designs of this type of a controller: 1. Step ballast load connection to the generator output using a contactor-relay switching; and 2. The use of analog power semiconductor automation (analog ballast load). The advantage of this solution is more accurate automatic control. One of the most promising circuit designs for small HPP ballast load controllers is a digital frequency controller. Digital measurement is widely used in modern circuitry, characterized by high accuracy and is well combined with a stepwise automatic ballast switched by thyristor contactors. The practice of using digital frequency controllers to stabilize the rotational speed of an off-grid small HPP has shown that they provide adequate power plant dynamic indicators and stable plant operation with almost all types of hydraulic turbines. This work, based on the analysis of the current use of digital frequency controllers as automatic ballast load controllers for small HPPs, proposes the use of automatic digital microprocessor control systems.
      PubDate: 2020-01-01
  • Private Solar Power Plants of Ukraine of Small Capacity: Features of
           Exploitation and Operating Experience
    • Abstract: — In the post-Soviet space, Ukraine has seen intensive development of private solar generation, which is facilitated by the “green” tariff legally introduced in the country on June 2015, which allows small private power plants with a capacity of up to 30 kW not only to consume energy for their needs, but also to sell surplus to the centralized network. In the country there is a well-defined algorithm for the relationship between the object of solar generation and the energy supplying organization. The three solar power plants of small capacity that are located in private households in the city of Melitopol’ is the striking example of this interaction. The analysis of the structure of these power plants, the orientation of the photovoltaic panels and their operation allows us to say that the electrotechnical generating equipment of these plants is effectively operated yearround. In the warm season, the consumed electric energy is enough to supply household and communal needs, and sell the surplus into the grid at the “green” tariff. In the cold season, at not all of these private power plants are the surplusses of the energy supplying organizations sold, since most of the electricity they generate is spent on heating the premises and supplying hot water. Today the possibility of increasing the power generation by photovoltaic modules within the framework of the quotas permitted by the “green” law is being considered.
      PubDate: 2020-01-01
  • Calculation of Thermal and Exergy Efficiency of Solar Power Units with
           Linear Radiation Concentrators
    • Abstract: A calculation and optimization algorithm is proposed for operating modes of composite parabolic trough mirror-concentrating sysetms (MCSs) with allowance for the geometric and optical parameters of the concentrator heat receiver in a wide range of operating conditions, as well as temperature conditions of the system as a whole. The thermal and exergy efficiency (i.e., the reversible thermal Carnot cycle) are estimated, the values of which for the developed linear composite parabolic trough concentrators are 0.4438 and 0.0932, respectively.
      PubDate: 2020-01-01
  • Solar Air Heater with Finned Absorber Plate and Helical Flow Path: A CFD
    • Abstract: In the present numerical investigation, a unique design of solar air heater with finned absorber plate allowing helical flow of air is considered. The design enhances the heat transfer rate by enhancing the effective heat transfer area as well as by increasing the flow turbulence. The novel design is compared with a conventional single flow single pass design. Computational study of flow dynamics and heat transfer characteristics for both the considered designs is done at different mass flow rates using commercial software ANSYS FLUENT 18.0. Results indicate a maximum thermal performance enhancement of 3.72 times due to the novel absorber plate design as compared to its flat plate counterpart at a mass flow rate of 0.013 kg/s. The rate of enhancement in the heat transfer coefficient with increase in mass flow rate is much higher in case of solar air heater with helical flow as compared to its conventional counterpart. Thermal and hydraulic performance for both the collectors at different mass flow rate is described in details and the results are supported with different contours.
      PubDate: 2020-01-01
  • Modelling and Parameters Extraction of Flexible Amorphous Silicon Solar
           Cell a-Si:H
    • Abstract: The precise of solar cell model parameters being the prerequisite for realizing accurate photovoltaic models. Hence, the parameters identification techniques have attracted immense interest over the years among the researchers. This paper proposes a modelling and prediction of electrical intrinsic parameter extraction method of flexible hydrogenated amorphous silicon a-Si:H solar cell, based on the meta-heuristic firefly algorithm (FA). The characteristics of solar cells are non-linear, multivariable and multi-modal and difficult to identifies the electrical intrinsic parameters by conventional and analytical methods with high accuracy. Recently, the firefly algorithm has attracted the attention to optimize the non-linear and complex systems, based on the flashing patterns and behaviour of firefly’s swarm. Besides, the proposed constrained objective function is derived from the current–voltage curve. It is the absolute errors between the experimental and calculated current and voltage values. Furthermore, the obtained results of the proposed algorithm are compared with the results obtained by quasi-Newton method (Q-N) and self-organizing migrating algorithm (SOMA). Indeed, to validate the performance of the algorithm, the statistical analyses are carried out to measure the accuracy of the estimated parameters. In the end, the theoretical results of the firefly algorithm show an excellent agreement with experimental data and more accurate compared to other compared techniques.
      PubDate: 2020-01-01
  • Comprehensive Design Tool for Sizing Solar Water Pumping System in Egypt
    • Abstract: Solar water pumping systems are considered one of the best solutions especially in rural and isolated areas where the traditional sources of power (electricity or diesel) are unavailable or very costly. It represents a clean source of energy, available with abundant quantities with very good average daily solar radiation of about 5.5 kW h/m2/day. The present work provides a comprehensive study for a complete design of the solar pumping system components with different water demands. A computer program is designed and developed to offer the system design and the solar simulation model is presented. The hydraulic power, photovoltaic (PV) peak power, PV required area, and total system costs for different total dynamic heads and different water demands ranged from 1–1000 m3/day are calculated. The present research is a good tool for designers, users, and buyers of such systems. It is found that the PV solar water pumping system is more economically feasible than diesel generators up to a water demand of 100 m3/day. The model is a needed tool for all concerned in the field of PV solar water pumping including costumers.
      PubDate: 2020-01-01
  • Silicon Photovoltaic Cells with Deep p–n -Junction
    • Abstract: By the diffusion obtained the Si 〈B, P〉 (group I) and Si 〈B, P + Ni〉 (group II) structures with deep p–n-junctions. It is demonstrated that the parameters of silicon photovoltaic cells with deep p–n-junctions are improved due to nickel doping. After nickel diffusion, the average value of the open circuit voltage Voc of the photo cells to group I increases by 19.7%, and the short-circuit current density Jsc in-creases by 89%. It was established that the formation of nickel clusters occurs at the optimum temperature of thermal annealing T = 750–800°C. The relative increase in the efficiency of photovoltaic cells after ad-ditional thermal annealing at T = 800°C is 118.8%. In addition, in samples with a nickel-enriched area on the front side of the p–n-junction, the fill factor of the current–voltage characteristic increased by 30%. The influence of nickel atom clusters on the bulk properties of the base and the properties of the surface regions of the solar cell, where the concentration of nickel atoms is 2–2.5 orders of magnitude greater than in volume, is considered. It is proved that the nickel-rich n-layer near-surface region plays a significant role in increasing the efficiency of photovoltaic cells. Experimental results show that an increase in the lifetime of minority charge carriers leads to a sig-nificant increase in the solar cell collection factor. We associate the obtained data mainly with the getter properties of nickel atom clusters. We assume that doping with nickel clusters can increase the absorption coefficient of the base of the solar cell in the infrared region of the spectrum due to the appearance of plasmon resonance, which should lead to a better alignment of the absorption region of infrared light with the p–n-junction.
      PubDate: 2020-01-01
  • Temperature Mode Optimization for Solar Reverse-Osmosis Water Desalination
    • Abstract: — This work is aimed at studying an effect of the temperature of source saline water on the efficiency of reverse osmosis membrane, the service life thereof, as well as the productivity of the considered small-scale solar water-desalination plant. For the case of this plant, alongside with solar photovoltaic cells used to supply necessary electrical energy, solar thermal converters are also recommended to use for a significant reduction in power consumption and for enhancing plant productivity.
      PubDate: 2020-01-01
  • The Method of Hydraulic Calculation of a Heat Exchange Panel of a Solar
           Water-Heating Collector of a Tube–Tube Type with a Given Nonuniform
           Distribution of Fluid Flow Along Lifting Pipes
    • Abstract: The purpose of this work is to develop a method for the hydraulic calculation of a heat exchange panel of a solar tube collector of a tube type with a given nonuniform distribution of fluid flow under conditions of forced circulation. On the basis of previously obtained design dependencies, a method of hydraulic calculation of a heat exchange panel of a solar thermal collector of a flat-plate type with a given uneven distribution of fluid flow under conditions of forced circulation has been developed. An example of calculation using the developed method is given.
      PubDate: 2020-01-01
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Heriot-Watt University
Edinburgh, EH14 4AS, UK
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