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Jie Cheng, doctoral student in electrical engineering, stands next to the partial prototype of a wind turbine system that research suggests could yield 8.5 percent more electricity than conventional counterparts.
A new prototype from the University of Nebraska-Lincoln's Jie Cheng could give a second wind to turbines that currently waste Mother Nature's strongest breaths. Cheng, a doctoral candidate studying electrical engineering, has designed a system that could improve wind turbine efficiency by capturing and storing surplus energy for later use as electricity.
In a recent study based on historical wind data from rural Springview, Nebraska, Cheng compared the prototype's performance against a conventional wind turbine for a week. That extra juice would account for more than 18 times the monthly energy use of the average American household, according to the U.S.
Physicists have shown that only 59.3 percent of the kinetic energy from wind can be captured by a rotor, with modern wind turbines designed to approach this limit. When the wind exceeds this speed threshold, turbines adjust their blade angles to maintain a constant energy output and prevent potential mechanical damage. Cheng's system helps resolve this problem by converting and directing the spillage to an air compression tank, where the excess energy remains until wind speeds dip enough to pull the turbine back beneath its optimal capacity. That way, Cheng said, the system addresses the wasted potential energy normally lost during strong winds as well as the energy deficit that turbines typically suffer during relatively calm periods. Cheng said vast swaths of open land and strong, consistent winds that characterize the Cornhusker State have made it ideal for testing his system and could make it a good place to begin incorporating the design.
Cheng is collaborating with Lincoln Electric System, the American Public Power Association and UNL's NUtech Ventures office to explore the market viability and introduction of his design. The Journal of Power and Energy Engineering published Cheng's recent study, which he authored with adviser Fred Choobineh, a Blackman Distinguished Professor of Engineering. EU's grid connected cumulative capacity in 2014 reached 129 GW, meeting 8% of European electricity demand, equivalent to the combined annual consumption of Belgium, the Netherlands, Greece and Ireland.
Siemens has increased the generator capacity of its gearless offshore wind turbines from six to seven megawatts.
Renewable wind energy is experiencing a boom, with more wind turbines popping up across landscapes in the U.S. High-frequency antennas transmit radio waves across vast distances and even over mountain ranges using very little energy, making them ideal for military communications. Virtual reality, oddly enough, isn't immune to the problems that arise in practical reality. Apple is edging its way a little further into health care with the release of new iPhone apps that patients can use to manage their own medical conditionsa€”from diabetes to pregnancy and even depression.
It's now possiblea€”though neither easy nor particularly convenienta€”to buy stuff on Facebook via automated messaging "bots." But it's far from clear that people really want to go shopping on the social network.
So it's basically a CAES based battery.The thing is, compressed air storage has abysmal efficiency because of compression heat loss and decompression pressure loss.
If having it wastes 90% then you've just gained 10% extra energy production for very little spillage Also, in larger wind farms or regions with lots of wind power, the other turbines already capture the energy spilled over.
It's a good thing Eikka did not tell us they were not economically feasible before we built them.
Nukes get greater subsidies, and would not even exist without them, yet the cost to produce (not sell), power from Vogtle Three is already up to thirteen cents, and still climbing. What Jie Cheng, the article's author, and most commenters here apparently fail to understand is that a properly designed wind turbine does not simply spill wind energy when its generator has reached maximum power. Were this not so, it would be simple enough to simply install a larger generator to up the design power level. You will have to learn to control your inverter outputs.Or, maybe batteries will save you, the kind they already have in Germany for reactance control.
A windbreak (a tree, or a group of trees or shrubs) will reduce the wind speed for a distance as much as 30 times the windbreaka€™s height. To maximize windbreaks, use trees and shrubs that have low crowns and block wind close to the ground. Planting shrubs, bushes and vines next to your house can help insulate your home in all seasons. Your local Home Energy Team affiliate can help you plan your energy efficient landscaping project - and help you make your home more comfortable, durable and energy efficient. On the eve of Thanksgiving this year, I was grateful I had the good fortune of meeting Nate Adams of Energy Smart Home Performance on his home turf in Cleveland, Ohio.
This is a house that if you looked at it from the curb it would bring to mind chilly, drafty interiors with steam radiators everywhere to offset the ever-present, creeping chill of winter by a giant lake. This approach, along with a building envelope that is well sealed and evenly insulated, can deliver incredible comfort at lower thermostat temperature set points. Perhaps what attracts me the most about this house, in addition to its amazing comfort at minimal energy demand, is that it proves this is where we need to focus our attention to reduce dependency on fossil fuels and improve outdoor air quality.
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Still, wish there were more details and pictures about the steps he took to insulate and air seal the house.
With the system constantly operating, it is 62F over the whole house, not just next to the thermostat.
Air sealing is certainly the best and cheapest start, followed by increasing attic insulation.
Replacing windows, increasing wall thickness, and replacing heating equipment is very costly and in many cases does not increase efficiency enough to warrant. We opted for getting Icynene foam blown into walls via 3 holes per 16″ between joists. Also laid down thick poly on crawl space floor and sealed to walls so moisture wouldn’t wreck things. Foam for walls – $7000, foam for attic, $5000 with $2000 rebater from electric company.
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As part of the Obama Administration's efforts to reduce energy bills for American families and businesses and reduce greenhouse gas emissions, the Energy Department today announced 12 projects to develop innovative heating, cooling, and insulation technologies as well as open source energy efficiency software to help homes and commercial buildings save energy and money. Commercial and residential buildings use nearly 40% of the total energy consumed in the United States each year and produce more than 40% of the nation's carbon pollution.
Today, the Energy Department announced about $6 million to nine projects that will develop new energy efficient building technologies, including heating, ventilation, and air conditioning (HVAC) systems and building insulation. National Renewable Energy Laboratory ($750,000 DOE investment): The project will develop affordable insulation plastic film for large windows.
Sandia National Laboratories and United Technologies Research Center ($750,000 DOE investment): This project will help demonstrate a rotating heat exchanger technology for residential HVAC systems. Thermolift, Oak Ridge National Laboratory, Stony Brook University, and National Grid ($750,000 DOE investment): This project will help commercialize a natural gas heat pump to provide heating, cooling, and hot water for homes and commercial buildings.
The Energy Department today also announced up to $5 million to three projectsa€”led by the University of California, Virginia Tech, and Carnegie Mellon Universitya€”to develop open source software that helps building owners and operators measure, monitor, and adjust lighting, HVAC, and water heating energy use to save energy without compromising performance.

See more about the Energy Department's broader efforts to help building owners and operators across the country save money by saving energy. Before installing new windows, it’s important to determine the type that will work best in your home’s configuration. Northern-facing windows collect no solar heat and generally are used only for lighting.  They can’t be counted on to provided sustained warmth, as they have very little SHGC capability. Consider, too, the type of window operating system you want to install, since different styles have different air leakage rates.
Fixed panes do not open at all, making these generally air tight, but no ventilation is available, either, which reduces their appeal.
Similarly, single- and double-sliding windows feature glass which slides horizontally, and they, too, have higher air leakage.
Casement windows are hinged at the sides and open outward.  Both these and awning windows, which are hinged at the top, are more airtight since the sash closes by pressing against the frame. Naturally, your selection is going to come down to the style that looks best on your home but, armed with this information, you can make a choice that balances aesthetics with energy-efficiency.
This entry was posted in DIY Tips, Exterior Preparation, Home Maintenance, Interior Preparation, Uncategorized, Windows and tagged energy efficiency, go green on September 11, 2015 by Scott Gibson. Unless your heating and air conditioning system has been recently updated, chances are your home is using a ducted system for heating and cooling.
If you’re looking for an eco-friendly heating and cooling system that will provide comfortable temperatures in your home year-round, perhaps it’s time to consider a ductless system. You can choose a different style and capacity unit for each zone in the home, providing a customized experience for each room. The difference is that in a multi-split system, each of the units has a line running back to the outdoor unit. While the multi-split system must be controlled via each indoor unit, you can control your entire home’s temperature through a single control with a flex system, which allows for better management. Before you jump on buying and installing one of the above systems, it’s important to note that there are different options for each. If you live in a climate where heating and cooling are equally important, then you’ll want to consider a heat pump.
Also consider if you’d like to completely replace your heating and cooling system or if you can use your home’s current duct system to supplement temperatures changes throughout the home.
If you need to manage different areas of the home independently, then a single-split system isn’t going to cut it.
If you’re not sure which option is best for your home and needs, contact a professional in your area for personalized advice. Brands we service:Rheem - Lennox - Amana - Carrier - Fujitsu - Ruud - Luxaire - Goodman - Trane - Bryant - York - Day & Night - Mitsubishi - Payne - Comfortmaker - Tappan - Honeywell - Williams - Nest - Coleman and more!
Improving the energy efficiency of our homes, businesses, and industries can yield quick, significant, and sustained energy savings, and save consumers and businesses billions of dollars in the process. Time and again, energy efficiency policies have proven to be smart investments that create significant financial returns. We already have the technology to reduce our natural gas and electricity consumption by more than 25 percent. In Climate 2030: A National Blueprint for a Clean Energy Economy, UCS highlights energy efficiency initiatives with the potential for the greatest savings. Programs like the Energy Star Label help consumers make better, more efficient choices when they replace or install new appliances. The industrial sector produces millions of different products for consumers each year, but is also responsible for about one-third of all U.S.
Energy-efficient building designs can significantly reduce the energy demands of both sectors. We can shift our nation away from dirty fossil fuels and toward cleaner, renewable sources of power—but not without you. Juliet Christian-SmithApril 29, 2016Why Would Congress Vote to Keep Carrots Out of Corner Stores?
The Supreme Court's recent ruling on the Clean Power Plan is a speed bump, not a stop sign. A thorough cleaning of your home will not only provide a fresh start to the season, it will also help to improve the energy efficiency of your home. Cheng found a 250-kilowatt system would yield an additional 3,830 kilowatt-hours of electricity per week a€“ about 16,400 extra kwh a month. However, these turbines also have a capacity for generating electricity that corresponds to a given wind speeda€”a speed far slower than what nature regularly whips up. The resulting "mechanical spillage" means that turbines fall well short of utilizing their full capacity.
The better the individual turbines capture energy, the more they slow down the wake they leave behind, so it's not strictly necessary to optimize individual turbines to maximum efficiency rather than minimum price and minimum maintenance.Rather, it would be cheaper and more effective to have a larger CAES battery that is served by multiple turbines through the grid.
A Windbreaks can save you a lot of money on heating and cooling costs, and the benefits grow as the trees and shrubs grow.
A The wind chill is how cold it a€?feels likea€? based on how fast heat is lost from skin due to wind and cold.
A Ideally, the trees and shrubs should be planted at a distance from the home that is 2-5 times the height of the mature tree. A So use windbreaks to make your landscape lovely and keep your heating costs down when the wind kicks up. It is estimated to be over 100 years old, survived a nearby natural gas plant explosion back in the 1940s, and is within a stone’s throw of Lake Erie. Overall, this was achieved by attention to detail pertaining to envelope air sealing and drastic reduction in duct leakage. It involves a mechanical and control strategy where the system’s capacity can infinitely vary between its maximum rated capacity to a turn down minimum much lower than conventional single speed systems can.
Be careful to provide ventilation or dehumidification enough to prevent creating a mold box. It is part of Important Media -- a network of 20 progressive blogs working to make the world a better, greener place. Opinions and comments published on this site may not be sanctioned by, and do not necessarily represent the views of Sustainable Enterprises Media, Inc., its owners, sponsors, affiliates, or subsidiaries.
These projects will receive an approximately $11 million Energy Department investment, matched by about $1 million in private sector funding.
According to the Energy Information Administration, about 48% of energy consumption in U.S. The projects will also help curb emissions of hydrofluorocarbons (HFCs)a€”potent greenhouse gases primarily used in refrigeration and air conditioning.
The transparent film easily fits on top of the window glass and uses a material familiar to the construction industry, helping to reduce manufacturing and supply chain costs.
The heat pump will improve HVAC system cycle efficiency and increase the use of heat pumps in colder climates.
The all-in-one unit will not use harmful hydrofluorocarbons and refrigerants and could triple space heating efficiency.

According to a study by the Pacific Northwest National Laboratory, commercial building owners could save an average 38% on heating and cooling bills by installing energy control systems. Each system includes an outdoor compressor along with indoor air-handling units connected to the outdoor unit by a refrigerant line. This is ideal for a single-zone space, such as a one-room addition to your home or if you’re installing heating and cooling for a garage or outbuilding. Unlike the single split system, the multi-split system allows you to create multiple zones in your house where each one can be controlled independently. Like a multi-split system, you can connect many indoor units to the same outdoor unit, but the flex zone system allows for more indoor units.
The heat pump system not only cools your home, but it can reverse the functions and heat your home by reversing the refrigerant flow. For instance, you could place a single-split unit in the main living area of your house and then use your current system for the bedrooms when needed.
For instance, upstairs bedrooms may need cooling power while the basement may need to be heated. What’s more, these energy savings would allow us to shut down the oldest, dirtiest power plants—and not build new ones to replace them.
In order to get these efficient technologies and measures deployed, we need policies and programs that help overcome entrenched, inefficient practices and empower businesses and consumers to make wise decisions and eliminate wasteful uses of energy. Investing in high-efficiency combined heat and power systems has the potential to save even more. Your generous support helps develop science-based solutions for a healthy, safe, and sustainable future.
Sign up to receive critical updates and urgent action opportunities from the Union of Concerned Scientists. Check out this infographic from Ambit Energy for all the details on energy-saving spring cleaning. The system would also marginally cut total energy costs while significantly reducing fluctuations in power generation, the study reported. When you release the air, the tank goes cold and the pressure is reduced.For small scale systems, the efficiency is barely above 10%. The efficiency goes up and the price goes down because you don't need to duplicate effort and maintain so many moving parts. A If you know how to use landscaping to maximize the benefits of windbreaks in your climate, you can save hundreds of dollars on your utility bills over time. A Same for your home, as the wind increases, your exposed home lets more cold outside air infiltrate, making your home colder - and making your heating source work harder to keep you comfortable.
Once inside, I was shown via the digital thermostat that the air temperature was 62?F, and later found the surrounding wall surfaces showed infrared scan readings in the mid 50s. In addition, Nate bravely specified a 24 KBTUH Carrier Greenspeed heat pump to replace a steam boiler (estimated at 100 KBTUH). Single speed (and to an extent, two-stage) systems are essentially binary control; they are either on or off, operating at full capacity or shut down.
Since Nate made sure the ducts were as air tight as possible, and very well insulated, minimal system loss or house pressurization concerns occur with a continually operating blower. On a house of this age in a climate with over 6000 heating degree days, this is an impressive feat.
Balloon construction – could run tape measure from basement, up two floors and into attic. In the United States, emissions of HFCs are expected to nearly triple by 2030, and double from current levels of 1.5% of greenhouse gas emissions to 3% by 2020. Ductless systems are a great choice because they don’t waste the energy typically lost through cracks and leaks in ducts.
These systems usually only require a small three-inch hole in the wall to run the conduits between the indoor and outdoor units.
Instead, you might have only two lines running back to the outdoor unit, and then each one “branches” so the system can accommodate up to 8 zones. The electricity used to power our air conditioners, lighting, refrigerators, and other appliances accounts for roughly half of that; water and space heating consume the rest. The buildings where we work, shop, meet, and play account for another 18 percent of energy consumption.
CAES starts to make sense if you hollow out a volume the size of a small apartment building Well whaddaya know: the hollow parts of the wind energy towers are just about that volume (and then some). There's money to be made in them there wind turbines, and only those who build them will make it. So far your front runner is because some stupid birds might fly into them I think you're confusing me with someone else.
With windbreaks, you provide a layer of insulation for your home to protect it from the wind. A system like Greenspeed has an inverter-driven compressor, variable speed blowers and fans, and electronically controlled expansion valves (EXVs) that together can precisely meter refrigerant and airflow for the actual load on the house at a given time of day.
The comfort result is minimal air temperature stratification within the home since the air is always in gentle motion, with the system adding or removing heat and humidity as needed. While better insulation and more efficient windows and equipment helped precipitate this decline, the projects announced today are focused on furthering these savings. They are also where some of the most significant and readily available energy savings can be found.
My main complaint is that they're unreliable and inconvenient in their intermittency, and as a result highly expensive as an energy source.
For anyone who understands psychrometrics, this is entirely possible from a psychrometric standpoint; now HVAC technology has caught up to make it possible for a well-suited house.
This result will be much less satisfactory if the building shell is leaky and unevenly insulated, and there is considerable duct leakage. CAES starts to make sense if you hollow out a volume the size of a small apartment building, or seal off an old mine for the air tank. So far your front runner is because some stupid birds might fly into them, as if domestic cats don't kill many thousands of times more birds or that birds fly into windows far more than wind turbines. As such they aren't a solution to our energy needs and problems, instead creating more problems than they solve, yet we are being forced to pay ever-increasing amounts of public money to the few private companies that build them. Nate knew this going in and worked very hard to ensure those negative factors were minimized. Other proposals have been to sink large concrete spheres under the sea and use the water as counter-pressure.

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