The journal, Renewable Energy, seeks to promote and disseminate knowledge on the various topics and technologies of renewable energy systems and components. The journal aims to serve researchers, engineers, economists, manufacturers, NGOs, associations and societies to help them keep abreast of new…
Solar thermal power plants designed for solar-only generation are well matched to summer noon peak loads in prosperous areas with significant cooling demands, such as the south-western United States. Using thermal energy storage systems, solar thermal operating periods can even be extended to meet base-load needs.
Jan. 25, 2017 — Germany decided to go nuclear-free by 2022. A CO2-emission-free electricity supply system based on intermittent sources, such as wind and solar — or photovoltaic (PV) — power could replace nuclear … read more
Everything the other reviewer stated was correct. The CEO Paul Graff is not just rude, he is sociopathic. He just yells, refuses to be reasoned with. I offered him a deal nobody could refuse, paying more for a system that had no contract and all I asked for was a contract that described the system. But no. So I brought a negotiator at no cost in to settle the dispute as Paul saw fit. He had never had anything intelligent to offer. They refused to participate. A year later they brought a forced arbitration upon me with “expedited proceedures.” I think they hoped to ambush me. They did and they still lost. 9 out 10 forced arbitrations are won by the corporation. So for them to lose everything with a lawyer on their case no less, this looks really bad. These are criminals. Dumb, rude, criminals. Bait and switch is their bread and butter. And everything is your fault. They charge you for exery mistake they make, so they try hard to make as many as possible. Then they yell at you. If they call, hang up. These are truly criminals. I’m not kidding. They bait you with what you want but install the very cheapest possible. This bait and switch. In my case, they forgot to give me a contract. Guess what? If you accept work from them they solar power a oecedent that ressurects some mythical contract. It’s dumb. The bait and switch is so effective that even caught, they still had enough money for materials labor abd a 40% profit margin on only a down payment of 50% of the total they claimed I owed. Even having lost their own forced arbitration, they still profited that much, EVEN WITHOUT A CONTRACT. Just run away. Hang up. All lies…. read more
Deciduous trees and plants have been promoted as a means of controlling solar heating and cooling. When planted on the southern side of a building in the northern hemisphere or the northern side in the southern hemisphere, their leaves provide shade during the summer, while the bare limbs allow light to pass during the winter. Since bare, leafless trees shade 1/3 to 1/2 of incident solar radiation, there is a balance between the benefits of summer shading and the corresponding loss of winter heating. In climates with significant heating loads, deciduous trees should not be planted on the Equator-facing side of a building because they will interfere with winter solar availability. They can, however, be used on the east and west sides to provide a degree of summer shading without appreciably affecting winter solar gain.
The most widely used flat-plate collectors consist of a blackened metal plate, covered with one or two sheets of glass, that is heated by the sunlight falling on it. This heat is then transferred to air or water, called carrier fluids, that flow past the back of the plate. The heat may be used directly, or it may be transferred to another medium for storage. Flat-plate collectors are commonly used for hot-water heating and house heating. The storage of heat for use at night or on cloudy days is commonly accomplished by using insulated tanks to store the water heated during sunny periods. Such a system can supply a home with hot water drawn from the storage tank, or, with the warmed water flowing through tubes in floors and ceilings, it can provide space heating. Flat-plate collectors typically heat carrier fluids to temperatures ranging from 66 to 93 °C (150 to 200 °F). The efficiency of such collectors (i.e., the proportion of the energy received that they convert into usable energy) ranges from 20 to 80 percent, depending on the design of the collector. (See also solar heating.)
A PV cell is made of semiconductor material. When photons strike a PV cell, they may reflect off the cell, pass through the cell, or be absorbed by the semiconductor material. Only the absorbed photons provide energy to generate electricity. When the semiconductor material absorbs enough sunlight (solar energy), electrons are dislodged from the material’s atoms. Special treatment of the material surface during manufacturing makes the front surface of the cell more receptive to the dislodged, or free, electrons so the that the electrons naturally migrate to the surface of the cell.
In America, utilities are burdened with infrastructure, such as the endless poles and wires that come down in storms. Off-Grid doesn’t have to worry about poles, and the wires only run a few feet, from panel to battery to appliance. Still, the company is working with technology that is brand-new and needs to be made cheaply in order to be affordable. When solar energy first came to Africa, it was expensive and unreliable. Arne Jacobson, a professor of environmental-resources engineering at Humboldt State University, in California, is a couple of decades older than most of the entrepreneurs I met in Africa. He got his doctorate studying the first generation of home solar in Kenya, in the late nineteen-nineties. “In Kenya, I was trying to understand the quality of the panels that had started to flood the market,” he said. Much of the technology had “big troubles. Chinese panels, panels from the U.K., all this low-quality junk coming in. Later, L.E.D.s that failed in hours or days instead of lasting thousands of hours, as they should. People’s first experiences were often really bad.”
The common features of passive solar architecture are orientation relative to the Sun, compact proportion (a low surface area to volume ratio), selective shading (overhangs) and thermal mass. When these features are tailored to the local climate and environment they can produce well-lit spaces that stay in a comfortable temperature range. Socrates’ Megaron House is a classic example of passive solar design. The most recent approaches to solar design use computer modeling tying together solar lighting, heating and ventilation systems in an integrated solar design package. Active solar equipment such as pumps, fans and switchable windows can complement passive design and improve system performance.
“A group of environmentalists wants Michigan’s utility companies to use 30 percent renewable energy by 2030. The wind and solar advocates have started a campaign to get their proposal on the 2018 statewide ballot. ”
The United States has some of the largest solar farms in the world. Solar Star is a 579 megawatt (MWAC) farm near Rosamond, California. Completed in June 2015, it uses 1.7 million solar panels, spread over 13 square kilometres (5.0 sq mi). The Desert Sunlight Solar Farm is a 550 MW solar power plant in Riverside County, California, that uses thin-film solar photovoltaic modules made by First Solar. The Topaz Solar Farm is a 550 MW photovoltaic power plant, in San Luis Obispo County, California. The Blythe Solar Power Project is a 485 MW photovoltaic station planned for Riverside County, California.
Concentrating solar energy technologies use mirrors to reflect and concentrate sunlight onto receivers that absorb solar energy and convert it to heat. We use this thermal energy for heating homes and buildings or to produce electricity with a steam turbine or a heat engine that drives a generator.
In the United States, one of the main problems with purchasing green energy through the electrical grid is the current centralized infrastructure that supplies the consumer’s electricity. This infrastructure has led to increasingly frequent brown outs and black outs, high CO2 emissions, higher energy costs, and power quality issues. An additional $450 billion will be invested to expand this fledgling system over the next 20 years to meet increasing demand. In addition, this centralized system is now being further overtaxed with the incorporation of renewable energies such as wind, solar, and geothermal energies. Renewable resources, due to the amount of space they require, are often located in remote areas where there is a lower energy demand. The current infrastructure would make transporting this energy to high demand areas, such as urban centers, highly inefficient and in some cases impossible. In addition, despite the amount of renewable energy produced or the economic viability of such technologies only about 20 percent will be able to be incorporated into the grid. To have a more sustainable energy profile, the United States must move towards implementing changes to the electrical grid that will accommodate a mixed-fuel economy.
Photovoltaic solar modules are composed of multiple, interconnected solar cells, which effectively trap photon energy between layers of silicon wafers. Negatively charged electrons are then knocked loose from their atoms, allowing them to flow freely through the semiconductors. Separate diodes, and P-N junctions prevent reverse currents and reduce loss of power on partially shaded panels.
Concentrating Solar Power (CSP) systems use lenses or mirrors and tracking systems to focus a large area of sunlight into a small beam. The concentrated heat is then used as a heat source for a conventional power plant. A wide range of concentrating technologies exists; the most developed are the parabolic trough, the concentrating linear fresnel reflector, the Stirling dish and the solar power tower. Various techniques are used to track the Sun and focus light. In all of these systems a working fluid is heated by the concentrated sunlight, and is then used for power generation or energy storage.
Solar energy is the energy that is in sunlight. It has been used for thousands of years in many different ways by people all over the world. As well as its traditional human uses in heating, cooking, and drying, it is used today to make electricity where other power supplies are absent, such as in remote places and in space. It is becoming cheaper to make electricity from solar energy and in many situations it is now competitive with energy from coal or oil. A solar cooker can be used for cooking food.
Renewable energy can be particularly suitable for developing countries. In rural and remote areas, transmission and distribution of energy generated from fossil fuels can be difficult and expensive. Producing renewable energy locally can offer a viable alternative.
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