Photovoltaics is the only form of renewable energy that is able to cover today’s global energy demand and can even do so many times over. The diurnal cycle and the cycle of the seasons, however, mean that photovoltaics is unable to provide a constant power supply in one location.
Ao.Univ.-Prof. Dr. Karl Steininger from the Institute of Economics and the Wegener Center of the University of Graz and his team have developed an analysis tool that helps to make solar power available efficiently and constantly. The paper has just been published in the renowned Proceedings of the National Academy of Sciences.
Real weather values
“We determined the real solar radiation at 270 global sites by analysing the insolation shown for these sites in the NASA data of the past twenty years and transferring them to hourly values”, Steininger says. The scientists took this data as their starting point to derive the production capacity a photovoltaics plant of a given size would have at a certain time. “By means of our tool we are able to determine what combinations of panel surface and storage capacity make sense from an economic perspective”, the economist explains.
In order to supply the minimum energy required, the plants are either dimensioned large enough to produce sufficient electricity even in overcast conditions or when insolation levels are low during winter, or the storage capacities are of such vast dimensions that seasonal and/or bad weather losses can be evened out.
“The price of the modules is currently declining more rapidly than the price of storage systems which makes larger photovoltaic surfaces often the more logical choice”, the expert says. And space is certainly not a problem. Steininger: “It would take a mere two percent of the world’s desert areas to supply the whole world with energy at its current demand level.”
The new analytical tool also helps to combine several photovoltaic plants at different global sites in an economically efficient manner. “If we combine sufficiently remote eastern and western sites, there will always be daytime somewhere in the grid and the excess energy can be transmitted to the places where the sun is not above the horizon.” The same is true for a combination of sites on the northern and southern hemisphere. “In summer, Austria is able to produce four times the solar energy volume it can generate in winter”, Steininger says. Transmission costs are currently significantly lower than storage costs.
The tool is also very useful for energy suppliers inasmuch as it allows them to respond to current weather situations and use their own photovoltaic systems in an optimum manner. The technologies for storing the generated electrical power differ in price and efficiency. When clouds are forecast plant managers could activate additional storage for example, and thus save the costs of storage in lasting high-pressure periods.
Steininger and his team have used a theoretical concept of “isolines” from economics for this interdisciplinary application. The concept ensures a constant output level and has been demonstrated to be of practical value for economic optimization here in situations of variable conditions of solar insolation.
For inquiries please contact:
Ao.Univ.-Prof. Dr. Karl Steininger
Institute of Economics and Wegener Center for Climate and Global Change
Universitity of Graz
Phone: +43 664 8463147
Mag. Gudrun Pichler | Karl-Franzens-Universität Graz
A big nano boost for solar cells
18.01.2017 | Kyoto University and Osaka Gas effort doubles current efficiencies
Multiregional brain on a chip
16.01.2017 | Harvard John A. Paulson School of Engineering and Applied Sciences
An important step towards a completely new experimental access to quantum physics has been made at University of Konstanz. The team of scientists headed by...
Yersiniae cause severe intestinal infections. Studies using Yersinia pseudotuberculosis as a model organism aim to elucidate the infection mechanisms of these...
Researchers from the University of Hamburg in Germany, in collaboration with colleagues from the University of Aarhus in Denmark, have synthesized a new superconducting material by growing a few layers of an antiferromagnetic transition-metal chalcogenide on a bismuth-based topological insulator, both being non-superconducting materials.
While superconductivity and magnetism are generally believed to be mutually exclusive, surprisingly, in this new material, superconducting correlations...
Laser-driving of semimetals allows creating novel quasiparticle states within condensed matter systems and switching between different states on ultrafast time scales
Studying properties of fundamental particles in condensed matter systems is a promising approach to quantum field theory. Quasiparticles offer the opportunity...
Among the general public, solar thermal energy is currently associated with dark blue, rectangular collectors on building roofs. Technologies are needed for aesthetically high quality architecture which offer the architect more room for manoeuvre when it comes to low- and plus-energy buildings. With the “ArKol” project, researchers at Fraunhofer ISE together with partners are currently developing two façade collectors for solar thermal energy generation, which permit a high degree of design flexibility: a strip collector for opaque façade sections and a solar thermal blind for transparent sections. The current state of the two developments will be presented at the BAU 2017 trade fair.
As part of the “ArKol – development of architecturally highly integrated façade collectors with heat pipes” project, Fraunhofer ISE together with its partners...
19.01.2017 | Event News
10.01.2017 | Event News
09.01.2017 | Event News
20.01.2017 | Awards Funding
20.01.2017 | Materials Sciences
20.01.2017 | Life Sciences