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Browsing Research Publications/Outputs by Impact Area "Energy Supply and Demand"

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An aerodynamic CFD analysis of inlet swirl in a micro-gas turbine combustor

Author: Meyers, Bronwyn C ; Grobler, Jan-Hendrik ; Snedden, GC Date: Jul 2023 A combustor was designed for a 200N micro-gas turbine [1, 2] using the NREC preliminary combustor design method [1, 2, 3]. During the design process, there are various aspects where there are no definitive methodologies for specifying the ... Read more
A benchmark dataset for defect detection and classification in electroluminescence images of PV modules using semantic segmentation

Author: Pratt, Lawrence E ; Matheus, Jana ; Klein, R Date: Dec 2023 Electroluminescence (EL) images enable defect detection in solar photovoltaic (PV) modules that are otherwise invisible to the naked eye, much the same way an x-ray enables a doctor to detect cracks and fractures in bones. This paper presents ... Read more c b n d
The Circular Economy as Development Opportunity: Exploring Circular Economy Opportunities across South Africa’s Economic Sectors

Author: Godfrey, Linda K ; Nahman, Anton ; Oelofse, Suzanna HH ; Trotter, Douglas ; Khan, Sumaya ; Nontso, Zintle ; Magweregwede, Fleckson ; Sereme, Busisiwe V ; Okole, Blessed N ; Gordon, Gregory ER ; Brown, Bernadette ; Pillay, Boyse ; Schoeman, Chanel ; Fazluddin, Shahed ; Ojijo, Vincent O ; Cooper, Antony K ; Kruger, Daniel M ; Napier, Mark ; Mokoena, Refiloe ; Steenkamp, Anton J ; Msimanga, Xolile P ; North, Brian C ; Seetal, Ashwin R ; Mathye, Salamina M Date: Dec 2021 The intention of this book is to present the CSIR’s position and interpretation of the circular economy, and to use it to drive discussions on where immediate circular economy opportunities are achievable in South Africa. Opportunities that ... Read more
The cost of production and storage of renewable hydrogen in South Africa and transport to Japan and EU up to 2050 under different scenarios

Author: Roos, Thomas H Date: Oct 2021 The decarbonisation of hard-to-abate sectors globally will require significant volumes of carbon-free hydrogen. An investigation has been performed to determine the cost at which hydrogen can be generated by electrolysis using renewable ... Read more
Cross-dataset performance evaluation of deep learning distracted driver detection algorithms

Author: Zandamela, Frank ; Ratshidaho, Terence ; Nicolls, F ; Stoltz, George G Date: Nov 2022 Deep learning has gained traction due its supremacy in terms of accuracy and ability to automatically learn features from input data. However, deep learning algorithms can sometimes be flawed due to many factors such as training dataset, ... Read more
Defect detection and quantification in electroluminescence images of solar PV modules using U-net semantic segmentation

Author: Pratt, Lawrence E ; Govender, Devashen ; Klein, R Date: Nov 2021 Electroluminescence (EL) images enable defect detection in solar photovoltaic (PV) modules that are otherwise invisible to the naked eye, much the same way an x-ray enables a doctor to detect cracks and fractures in bones. The prevalence of ... Read more
Experimental analysis of a zeolite heat storage system

Author: Sheik, Muhammed ; Klein, Peter ; Segakweng, Tshiamo Date: Nov 2021 Solar energy supply does not always match demand and it is therefore necessary to investigate efficient ways of storing thermal energy. Sorption based thermochemical heat storage provides high energy densities as well as an exceptional advantage ... Read more
Impact of measured spectrum variation on solar photovoltaic efficiencies worldwide

Author: Kinsey, GS ; Riedel-Lyngskær, NC ; Miguel, A ; Boyd, M ; Braga, M ; Shou, C ; Cordero, RR ; Duck, BC ; Maweza, Elijah L ; Pratt, Lawrence E Date: Aug 2022 In photovoltaic power ratings, a single solar spectrum, AM1.5, is the de facto standard for record laboratory efficiencies, commercial module specifications, and performance ratios of solar power plants. More detailed energy analysis that ... Read more
Magnetite thermal energy storage for CSP plants

Author: Sheik, Muhammed ; Segakweng, Tshiamo ; Sekhuthe, Karabelo L Date: Nov 2023 The Department of Mineral Resources and Energy estimates that the industrial sector is the largest consumer of energy in South Africa. Approximately 66% of energy end-use in industry is for heat generation during manufacturing. South African ... Read more
Modelling of solar photovoltaic module performance

Author: Mkasi, Hlaluku W ; Lawrence, Pratt ; Ayanna, Manjunath B ; Roro, Kittessa T Date: Nov 2021 The high demand for low carbon energy and rapidly decreasing solar panel prices have led to a surge in solar photovoltaic (PV) plants across the globe, more than at any other time since the industry began. Combined with geographic variations ... Read more
Modelling photovoltaic power output using machine Learning techniques

Author: May, Siyasanga I ; Pratt, Lawrence E ; Roro, Kittessa T ; Bokoro, P Date: Aug 2022 This work focuses on modelling the power output of multiple PV technologies installed at the outdoor test facility of the Council for Scientific and Industrial Research (CSIR) in Pretoria. Extreme Gradient Boosting (XGB) and Artificial Neural ... Read more
Multi-resolution segmentation of solar photovoltaic systems using deep learning

Author: Kleebauer, M ; Marz, Christopher A ; Reudenbach, C ; Braun, M Date: Dec 2023 In the realm of solar photovoltaic system image segmentation, existing deep learning networks focus almost exclusively on single image sources both in terms of sensors used and image resolution. This often prevents the wide deployment of such ... Read more
The numerical aerodynamic investigation of swirling inlet flow in a vaporizer tube micro-gas turbine combustor

Author: Meyers, Bronwyn C ; Grobler, Jan-Hendrik ; Snedden, GC Date: Sep 2022 A combustor was designed for a 200N micro-gas turbine for the model aircraft industry using the NREC design method. Multiple designs resulted which varied in terms of annular area split configuration, hole area splits and relative hole ... Read more
Power output predictions of photovoltaic system using machine learning

Author: May, Siyasanga I ; Pratt, Lawrence E ; Roro, Kittessa T ; Bokoro, P Date: Nov 2021 This work focuses on developing prediction models for the power output of multiple PV technologies installed at the outdoor test facility on the Pretoria campus of the Council for Scientific and Industrial Research. Random Forest (RF) and ... Read more
PV module reliability scorecard - Round 1

Author: Pratt, Lawrence E ; Basappa Ayanna, Manjunath ; May, Siyasanga I ; Mkasi, Hlaluku W ; Maweza, Elijah L ; Roro, Kittessa T Date: Nov 2021 Solar PV system component reliability is key to longterm success for the PV industry, given the 25-year lifespan of PV generators. PV modules are one key component needed to deliver on the lifetime production of PV systems, as they are the ... Read more
Solar PV inverter characterization in indoor laboratory

Author: Basappa Ayanna, Manjunath ; Pratt, Lawrence E ; Roro, Kittessa T Date: Nov 2021 A commercial 3ph 25 kW inverter is characterised at the Smart Grid Laboratory, CEA-INES in accordance with IEC/EN 61727 and EN50530. The minimum, nominal and maximum power point tracking power conversion efficiency for normalized power levels ... Read more
Spectral analysis using a multi-bin method for photovoltaic sites

Author: Maweza, Elijah L ; Pratt, Lawrence E ; Roro, Kittessa T Date: Nov 2021 The high demand for low carbon energy and rapidly decreasing solar panel prices have led to a surge in solar photovoltaic (PV) plants across the globe, more than at any other time since the industry began. Combined with geographic variations ... Read more
Statistics of utility-scale power generation in South Africa in 2021

Author: Pierce, Warrick T ; Ferreira, Bianca A Date: Apr 2022 Summary of 2021 statistics: Coal still dominates and provides about 80% of electricity generated, record high diesel usage, and renewables (excluding hydro) accounted for 6.7%. Read more
Statistics of utility-scale power generation in South Africa in 2021

Author: Ferreira, Bianca A ; Pierce, Warrick T Date: Apr 2022 This presentation discusses the statistics derived from utility-scale power generation in South Africa in 2021. Read more
Systems based CFD modelling of package steam boilers

Author: Klein, Peter ; Potgieter, M ; Ferreira, Bianca A Date: Aug 2021 Dynamic thermo-fluid models of fire-tube steam boilers can be used to optimise the design and operation of equipment, resulting in possible energy and emissions savings. This work presents the development of a dynamic boiler model of a 4-pass ... Read more

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