University of Washington engineers have developed a novel technology that uses a Wi-Fi router -- a source of ubiquitous but untapped energy in indoor environments -- to power devices. The Power Over Wi-Fi (PoWiFi) system is one of the most innovative and game-changing technologies of the year, according to Popular Science, which included it in the magazine's annual "Best of What's New" awards announced Wednesday. The technology attracted attention earlier this year when researchers published an online paper showing how they harvested energy from Wi-Fi signals to power a simple temperature sensor, a low-resolution grayscale camera and a charger for a Jawbone activity tracking bracelet. The final paper will be presented next month at the Association for Computing Machinery's CoNEXT 2015 conference in Heidelberg, Germany, on emerging networking experiments and technologies. "For the first time we've shown that you can use Wi-Fi devices to power the sensors in cameras and other devices," said lead author Vamsi Talla, a UW electrical engineering doctoral student. "We also made a system that can co-exist as a Wi-Fi router and a power source -- it doesn't degrade the quality of your Wi-Fi signals while it's powering devices." PoWiFi could help enable development of the Internet of Things, where small computing sensors are embedded in everyday objects like cell phones, coffee makers, washing machines, air conditioners, mobile devices, allowing those devices to "talk" to each other. But one major challenge is how to energize those low-power sensors and actuators without needing to plug them into a power source as they become smaller and more numerous. The team of UW computer science and electrical engineers found that the peak energy contained in untapped, ambient Wi-Fi signals often came close to meeting the operating requirements for some low-power devices. But because the signals are sent intermittently, energy "leaked" out of the system during silent periods. The team fixed that problem by optimizing a router to send out superfluous "power packets" on Wi-Fi channels not currently in use -- essentially beefing up the Wi-Fi signal for power delivery -- without affecting the quality and speed of data transmission. The team also developed sensors that can be integrated in devices to harvest the power. In their proof-of-concept experiments, the team demonstrated that the PoWiFi system could wire-lessly power a gray-scale, low-power Omnivision VGA camera from 17 feet away, allowing it to store enough energy to capture an image every 35 minutes. It also re-charged the battery of a Jawbone Up24 wearable fitness tracker from zero to 41 per cent in 2.5 hours. The researchers also tested the PoWiFi system in six homes. Users typically didn't notice deterioration in web page loading or video streaming experiences, showing the technology could successfully deliver power via Wi-Fi in real-world conditions without degrading network performance. Although initial experiments harvested relatively small amounts of power, the UW team believes there's opportunity for make the PoWiFi system more efficient and robust. "In the future, PoWi-Fi could leverage technology power scaling to further improve the efficiency of the system to enable operation at larger distances and power numerous more sensors and applications," said co-author Shyam Gollakota, assistant professor of computer science and engineering. Source: Article, Source: flickr.com
Powering the next billion devices with Wi-Fi
University of Washington engineers have developed a novel technology that uses a Wi-Fi router -- a source of ubiquitous but untapped energy in indoor environments -- to power devices. The Power Over Wi-Fi (PoWiFi) system is one of the most innovative and game-changing technologies of the year, according to Popular Science, which included it in the magazine's annual "Best of What's New" awards announced Wednesday. The technology attracted attention earlier this year when researchers published an online paper showing how they harvested energy from Wi-Fi signals to power a simple temperature sensor, a low-resolution grayscale camera and a charger for a Jawbone activity tracking bracelet. The final paper will be presented next month at the Association for Computing Machinery's CoNEXT 2015 conference in Heidelberg, Germany, on emerging networking experiments and technologies. "For the first time we've shown that you can use Wi-Fi devices to power the sensors in cameras and other devices," said lead author Vamsi Talla, a UW electrical engineering doctoral student. "We also made a system that can co-exist as a Wi-Fi router and a power source -- it doesn't degrade the quality of your Wi-Fi signals while it's powering devices." PoWiFi could help enable development of the Internet of Things, where small computing sensors are embedded in everyday objects like cell phones, coffee makers, washing machines, air conditioners, mobile devices, allowing those devices to "talk" to each other. But one major challenge is how to energize those low-power sensors and actuators without needing to plug them into a power source as they become smaller and more numerous. The team of UW computer science and electrical engineers found that the peak energy contained in untapped, ambient Wi-Fi signals often came close to meeting the operating requirements for some low-power devices. But because the signals are sent intermittently, energy "leaked" out of the system during silent periods. The team fixed that problem by optimizing a router to send out superfluous "power packets" on Wi-Fi channels not currently in use -- essentially beefing up the Wi-Fi signal for power delivery -- without affecting the quality and speed of data transmission. The team also developed sensors that can be integrated in devices to harvest the power. In their proof-of-concept experiments, the team demonstrated that the PoWiFi system could wire-lessly power a gray-scale, low-power Omnivision VGA camera from 17 feet away, allowing it to store enough energy to capture an image every 35 minutes. It also re-charged the battery of a Jawbone Up24 wearable fitness tracker from zero to 41 per cent in 2.5 hours. The researchers also tested the PoWiFi system in six homes. Users typically didn't notice deterioration in web page loading or video streaming experiences, showing the technology could successfully deliver power via Wi-Fi in real-world conditions without degrading network performance. Although initial experiments harvested relatively small amounts of power, the UW team believes there's opportunity for make the PoWiFi system more efficient and robust. "In the future, PoWi-Fi could leverage technology power scaling to further improve the efficiency of the system to enable operation at larger distances and power numerous more sensors and applications," said co-author Shyam Gollakota, assistant professor of computer science and engineering. Source: Article, Source: flickr.com
Spain: Government expects solar to dominate by 2030 with up to 77 GW
Spain has currently an installed PV power of around 4.8 GW. Image: Solaria EnergÃa
In a new report, the Spanish Ministry of Industry, Tourism and Digital Agenda has predicted that solar will become the country’s largest electricity source by the end of the next decade. Cumulative installed PV power could even reach 77 GW by the end of 2030, according to the most bullish scenario drafted by the Spanish government.APRIL 3, 2018 EMILIANO BELLINI
Spain’s Ministry of Industry, Tourism and Digital Agenda has published a new report, including new growth scenarios for the future of the Spanish energy market, which recognizes solar as the future cheapest source of power, and the dominance of PV above all other energy sources by 2030.
The first scenario, called the “distributed generation scenario” (DG), forecasts strong development of renewable energy distributed generation coupled with storage systems.
According to the most optimistic figures provided by the ministry, solar is expected to reach a power production capacity of 47.1 TWh by 2030, thus becoming the country’s leading power source, followed by wind (31.0 TWh), combined cycle plants (24.5 TWh), hydropower (23.0 TWh), cogeneration facilities (8.5 TWh), and nuclear power (7.1 TWh). Overall, storage is expected to account for 2.3 TWh of total demand.
Under this scenario, renewables would have a 70% share in Spain’s electricity mix, while solar PV technology would reach a cumulative installed power of around 77 GW, followed by wind with 47.5 GW.
A second, less ambitious scenario, called “sustainable transition scenario” (TS), also expects solar to become the largest and cheapest source of power by 2030, but with “only” 40 TWh of power production capacity, and no storage deployed. Under this scenario, however, renewables would still account for 67% of total power generation capacity, although part of the missing 7 TWh from solar would be partly replaced with 4 TWh of power generation from coal.
The country’s power demand is expected to increase from around 253 TWh currently, to 285 TWh (TS scenario) and 296 TWh (DG scenario), respectively. Costs of power generation, meanwhile, would range from €52/MWh in the TS scenario to €32.7/MWh in the DG scenario.
Commenting on the scenario with the highest penetration of solar and renewables, the Spanish government said that their increasing share would significantly reduce power generation costs, thus enabling savings of around €9.6 billion.
This would negatively impact the profitability of thermal back-up capacity, which will still be necessary in order to deal with fluctuations, while also making renewable energy project investment returns more problematic, the ministry said.
CO2 emissions, however, would be more than halved, and power exports to France would increase by around 236%, as a consequence of the price spread with the neighboring country, the report’s authors noted.
Spanish solar association, UNEF has welcomed the findings of the report, claiming that the Spanish government has finally acknowledged the high value of the PV technology.
“The forecast of a considerable increase in installed PV capacity by 2030, which would increase tenfold compared to current levels, is a key opportunity to allow citizens to have access to cheaper energy and to reach a more stable development model, in contrast to the dynamics of acceleration-braking-acceleration that has characterized the last years,” said association president, José Donoso.
Spain has currently an installed PV power of around 4.8 GW. Source: https://www.pv-magazine.com
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