Author:Johannsen, ADate:Nov 1982Principles of the operation of air-heating collectors are discussed. The fundamental differences between the design principles of air-heating as opposed to water-heating collectors are highlighted. The main requirement is the transfer of heat ...Read more
Author:Strydom, JFSDate:27 Nov 1979The objective of two of the studies was to choose the most economical source of heating energy, taking cognizance of the building owner’s particular circumstances; in both cases a suitable alternative to light petroleum oil, which had been ...Read more
Author:Smit, Jacoba E; Grobler, AF; Karsten, AE; Sparrow, RWDate:Jul 2009Currently the primary source of energy for industrial and domestic use is based on fossil fuels. The supplies of these fuels are limited and are becoming depleted. Thus there is a search for alternative and more sustainable energy sources. ...Read more
Author:Page-Shipp, RJDate:10 Sep 1980This article correctly reflects the principles of Solar Water Heating as they pertain to South African conditions. However, it was written in 1980 and the global energy situation has changed considerably. Furthermore, modern commercial units ...Read more
Author:Greben, H; Burke, LM; Szewczuk, SDate:Oct 2009Identifying alternative sources of energy is a matter of urgency, since conventional energy sources are becoming exhausted. Renewable energy sources, such as biogas, can be generated from organic waste, through the anaerobic digestion (AD) ...Read more
Author:Rubin, N; Roos, T; Wilson, F; De Villiers, J; Perumal, SDate:May 2012Modelling, Identification, Simulation and Synthesis are well known components of the System Engineering Process. Ally these with the Target Aligned (TA) heliostat architecture and the universally acknowledged merits of using closed loop ...Read more
Author:Le Roux, Lukas J; Hietkamp, S; Cummings, FDate:Nov 2008An attractive and cheaper alternative to siliconbased photovoltaic (PV) cells for the conversion of solar light into electrical energy is to utilise dyeadsorbed, large-band-gap metal oxide materials such as TiO2 to absorb the solar light. ...Read more
Author:Le Roux, Lukas J; Arendse, C; Hietkamp, SDate:Feb 2006As fuel sources become depleted, there is an increasing need to turn to alternative sources of energy. Of particular interest, especially in southern Africa, is solar energy, since it is clean and abundant. A novel system that harnesses solar ...Read more
Author:Roro, Kittessa T; Tile, N; Yalisi, B; Forbes, ADate:May 2011For efficient photo-thermal conversion of solar energy a spectrally selective solar absorber surfaces are widely used. An ideal selective surface should have a high absorptance (low reflectance) in the solar wavelength range (0.3 to 2.5 µm) ...Read more
Author:Roro, Kittessa TDate:Jul 2011This presentation explores solar thermal energy for harnessing solar energy for thermal energy (heat). Solar thermal collectors for water heating use a spectrally selective surface that absorb sunlight and convert it to heat. The presentation ...Read more
Author:Yalisi, B; Katumba, G; Forbes, A; Pillay, SRDate:Jun 2009Selective solar absorbers are devices that have been designed to absorb as much as possible of the solar radiation which is in the wavelength range of 0.3 to 2.5 µm and to minimise thermal emittance in the wavelength range from 2.5µm to the ...Read more
Author:Bischof-Niemz, STDate:Oct 2015South Africa’s power system is currently under severe constraints with load shedding that occurred during 82 days in the first half of 2015. The Department of Energy is procuring new generation capacity and has already allocated a total of ...Read more
Author:Bischof-Niemz, TDate:Sep 2015This presentation looks at the status of the South African energy industry today. Solar PV & wind are the cheapest new-build options per kWh in South Africa, and cost competitiveness of renewables has two consequences: 1) distributed power ...Read more
Author:Bischof-Niemz, T; Roro, Kittessa TDate:Sep 2015Traditionally, when public entities buy an asset under an Engineering, Procurement and Construction (EPC) contract, the screening of the responses to the request for proposals is done in two stages: In a filter stage, all proposals that are ...Read more
Author:Bischof-Niemz, TDate:Oct 2015Renewables have, until today, been mainly driven by the United States, European and Chinese markets. This presentation reflects on the actual results by the South African Department of Energy on the cost comparativeness of South African solar ...Read more
Author:Cawood, WNDate:1976Since primitive man first set fire to a heap of twigs to warm his cave, mankind has been making use of the earth's energy resources. Fortunately, we still have the sun, which offers us an inexhaustible source of non-polluting energy.Read more
Author:Mphahlele, N; Ozoemena, KI; Le Roux, Lukas J; Cele, LMDate:May 2011Dye solar cell (DSC) has become one of the attractive devices for the conversion of solar energy into electricity worldwide, because of their remarkable properties such as low cost, non-toxicity and easy to fabricate as compared to other ...Read more
Author:Mushwana, CrescentDate:Sep 2015In 2014, 93 GW of wind and PV were newly installed globally, and until today renewables are mainly driven by the United States, Europe and China. South Africa has implemented an Integrated Resource Plan 2010 which highlights a plan of the ...Read more
Author:Bischof-Niemz, TDate:Sep 2015South Africa’s is a very carbon-intensive economy and its energy system is based on domestic coal and on imported oil. More than 50% of South Africa’s CO2 emission is due to electricity production from coal (Eskom), and ~16% of South Africa’s ...Read more