GPS, Cameras To Improve Snowplow Efficiency
2009-11-14 15:58:00 Winter is, sadly, coming soon. Mayor Daley, after getting his proverbial butt spanked last year for cutbacks to snow removal because of budget deficits....
Portland Eco-Districts, OLED Lighting, Efficiency First, + Sustainable Path
2009-09-19 11:00:00 The green case for city living. Sustainable cities are the solution. A major price drop for solar panels. Panels of OLED lights fascinate designers. Interest in sustainable buidling grows. Portland establishes eco-districts to reduce GHGs. New green buildings put efficiency and environment first. The two different paths toward sustainability. Off-the-grid and self-reliant new homesteaders. The business of sustainability. Congratulations to Ben and Aaron for each winning a copy of the Earth DVD in our recent contest. Also, follow @jetsongreen on Twitter for more news, links, and commentary.
By: Jetson Green
New Gasoline-Diesel Mixture to Raise Efficiency and Lower Emissions without
2009-09-17 03:59:00 Both gasoline engines and diesel engines have their advantages over the other when it comes to certain applications. However, they both also suffer from drawbacks that some people find too difficult to live with. This may all change though, as a new gasoline-diesel mixture is being researched and tested that promises to bring the best of both worlds into the hands of the consumer.
Carbon Nanotubes Used to Build a Near-Ideal Efficiency Solar Cell
2009-09-15 16:16:00 From Gizmag Emerging Technology Magazine: Today's photovoltaic technology, while certainly promising, offers very poor efficiency because of inherent issues in its working mechanism. Using carbon nanotubes, however, Cornell University researchers now hope to lead the way to the nex
Prius 6-Door Limo Goes To Great Lengths For Hybrid Efficiency
2009-09-07 02:00:00 Coming after the innovative yet outrageous Prius Hearse, the Prius Limo stretches the concept of hybrid efficiency to new heights... or should we say, lengths.
Increasing the Efficiency of an Old Boiler
2009-09-04 15:38:00 Problem: I have a boiler that I use to circulate an antifreeze mixture through tubing that is in the concrete of my car wash bay floors. This boiler is 20+ years old and not nearly as efficient as it could be. During the harsh winter months here in Michigan, I see an increase of around $2500/month i
Tetris players found to have greater brain efficiency, thicker cortex and b
2009-09-02 23:05:00 From Engadget: You just knew all that Tetris playing you did as a kid yesterday was good for you, huh? A new study published by the big thinkers at Mind Research Network has found that "practicing Tetris" can actually improve brain efficiency and lead to a thicker cortex in other a
From speed comes efficiency?
2009-08-26 23:06:00 The annual Isle of Man TT Has spawned a new class This year, the Manx government added a futuristic new event to the June race schedule. The TTXGP, for "Tourist Trophy eXtreme Grand Prix," was billed as the first zero-emissions motorcycle race. All of us here know that there is no such
improving the efficiency of electric hybrid bike
2009-08-26 18:28:00 i am going to design a electric hybrid bike with improved efficiency wih existing one....... in that the shoock obsorbs and seats are designed in electrical design likewise copper coil wounded outside as a spring and inside with permanant magnet it should design with high flux density and improved n
Inverter Efficiency Errors
2009-08-23 05:04:00 Before I start, for those who have posted that it is cheaper to go out and buy an inverter rather build your own, it entirely depends on which part of the world you live in. The total cost of parts for a 2000 Watt Sine wave inverter outside of "developed" nations is roughly $30.00 USD. We are do
New 5-Stroke Engine to Boost Efficiency and Reduce Emissions
2009-08-23 00:54:00 Our four stroke engines have been around for a very long time and while many small changes have been made to them over those many years, the basic principal of operation has remained the same. Now, a new engine design that uses an additional stroke may be taking over the number 1 position when it comes to small powerplants.
A New Approach to Improve Diesel Engine Efficiency
2009-07-30 21:01:00 A New Approach to Improve Diesel Engine Efficiency Diesel Engines play an important role as Prime mover for various Stationary and Mobile Equipment for many Decades. It is being manufactured right from little horse power to more than hundred thousand horse power. There is no alternative for
NDT % vs. Joint Efficiency - ASME B.31.1
2009-07-29 16:38:00 The Question is How we can determinate the % of NDT for welds when the Factor E is different than 1 (Full NDT according with Table 136.4 ASME B31.1). But for Random per example with E 0.85, whats the % to be used, 10%, 20%,15%..........???? What is the way to determinate the minimun random
US Vehicle Efficiency Hardly Changed Since Model T
2009-07-24 14:56:00 From New Scientist - Online News: The average fuel efficiency of the US vehicle fleet has risen by just 3 miles per gallon since the days of the Ford Model T, and has barely shifted at all since 1991. Those are the conclusions reached by Michael Sivak and Omer Tsimhoni at the Un
Rock The Bike utilizes power efficiency of JBL PRX series Loudspeakers to d
2009-07-20 10:30:00 In a highly creative and environmentally forward-thinking application of JBL PRX portable loudspeakers, Rock the Bike, a designer and manufacturer of bicycles with an eye on raising the awareness of the ?bike culture,? has employed PRX loudspeakers at several of its live music events, which are run on human power generated on bicycles. For its ...
By: Gadget Mania
How to Calculate the Efficiency of Cooling Tower
2009-07-14 14:52:00 I have all the necessary data with me to find the efficiency of cooling tower. I used the following formula to find out the efficiency of cooling tower but i think it may lead to wrong answer...kindly help me out Efficiency = (Inlet Temp - Outlet Temp) / (Inlet Temp - Wet bulb temp of air)
Calculating Cooling Tower Efficiency
2009-07-14 14:52:00 I have all the necessary data with me to find the efficiency of cooling tower. I used the following formula to find out the efficiency of cooling tower but i think it may lead to wrong answer...kindly help me out Efficiency = (Inlet Temp - Outlet Temp) / (Inlet Temp - Wet bulb temp of a
Efficiency of 5 to 10 kw gasoline generators for home use
2009-07-13 03:23:00 For 100% efficient conversion you should get 38 kwh per gal of gasoline from these things. Anyone run a test on these small generators? Commercially generated power in the US goes from 10 to 40 cents/kwh, so these small inefficient engine/generators should cost more per kwh than this.
Efficiency of 5 to 10 KW Gasoline Generators for Residential Use
2009-07-13 03:23:00 For 100% efficient conversion you should get 38 kwh per gal of gasoline from these things. Anyone run a test on these small generators? Commercially generated power in the US goes from 10 to 40 cents/kwh, so these small inefficient engine/generators should cost more per kwh than this.
Money To Burn: CL & P, UI Have Millions In Energy-Efficiency Funds To Offer
2009-07-06 04:56:00 Image by 80sAustin via Flickr By LYNN DOAN, The Hartford Courant Late last year, Connecticut Light & Power Co. was desperate for energy conservation money. Several programs it runs for the state, which pay for power-saving improvements from lightbulbs in homes to tinted windows in office parks, were oversubscribed. The company had promised $10 million it didn’t have ...
By: News for Greens
Efficiency In Inefficiency
2009-06-23 06:00:00 Cycling is said to be an efficient mode of transport, when compared to running or driving a motor vehicle. Agreed. Mile for mile, far lesser calories and energy is spent, far lesser pollution emitted. But might that idea topple upside down when the road heads uphill?When road grade rises, there is a seesaw effect in the amount of resistance wind and gravity play. Wind drag now goes down resisting less, and gravity comes up slowing you considerably. All that matters now is how much weight you carry and what gearing you have on the bike. The same gearing that perhaps tripled your speed output on a given rotational crank input on flats will plunge on a steep climb. If you choose to go with a lower gearing, your speed drops. So there is an apparent tradeoff there.But it stands out, I guess, that one of the obvious elements of cycling athleticism - this notion of how good a cyclist someone is - is by assessing how well they can climb steep roads. Some of us may have this thinking that we...
condensor vacuum limits turbine cycle efficiency or not
2009-06-18 09:11:00 More the condensor vacuum more the turbine output & more efficiency or is there any limit.
Turbine Efficiency
2009-06-18 09:11:00 More the condensor vacuum more the turbine output & more efficiency or is there any limit.
Combustion Efficiency and Room Ventilation
2009-06-17 20:17:00 dear sir, I want to know what is the air:fuel(diesel) ratio for best combustion efficiency?Secondly how to calculate heat dissipated from engine and generator to calculate the fresh air and exhaust air required by allowing 6 deg.c. rise in room temprature than atmospheric tempr
Do High-efficiency Motors Save Energy?
2009-06-17 14:16:00 Motor efficiency is not a single number; it depends on how the motor is used. Most efficiencies are measured at 75% output. What if the motor is used at 50% output? Or 90%? Or what if the load is highly variable? Part of the energy savings comes from reduced motor slip — but this actually rais
DIY Solar Charger Wins United States Of Efficiency Contest
2009-06-16 20:14:00 Jerome Kelty of Boulder County, CO was so concerned about how much carbon dioxide was being released into the air simply by the charging of iPhones® and iPod Touches®, that he decided to build his own solar charger for them and a range of other devices with USB ports. He won a new 'green' Mac computer, and you win his DIY instructions for the solar charger!
Energy Efficiency Is Becoming Passé
2009-06-14 14:19:00 Look at the difference a year makes: in 2008 all the talk was about energy efficiency and "green" was the buzzword. Now, one year later, energy prices have dropped and the difficult economic conditions are forcing companies to look for other ways to invest their capital instead of in energy-saving
Find the Volumetric Efficiency
2009-06-12 21:23:00 a single stage air compressor with 6% of clearance volume compresses air from 1.2 bar to 6.5 bar.find the volumetric efficiency if the exponent of expansion process changes from 1.55 to 1.72.
VRV system ; efficiency
2009-06-02 10:59:00 how does the VRV system efficient than conventional type A/C units?
Efficiency of PowerChain belt drives?
2009-05-28 13:23:00 Is there any independant data on the losses for these Gates belts? Would appreciate any sources you could suggest.
Efficiency of Gates Powerchain Belts
2009-05-28 13:23:00 Is there any independant data on the losses for these Gates belts? Would appreciate any sources you could suggest.
Water Heating Efficiency
2009-05-24 09:50:00 We have a situation at my work where we heat water to 95 oC because we only have one tank, but require process water at 92, 82 and 70 oC. We mix cold water with the 95 oC water to bring the temp down for the other set points. We heat the tank with direct steam injection which is pretty efficient, bu
Do High Efficiency (HE) Motors Save Energy?
2009-05-19 14:38:00 With standard electric motor efficiencies running at 85 — 90% it's hard to see what a few extra percentage points will mean in the long run for motor applications. Motor efficiency levels are measured at specific output loads, usually 75%. So what if the actual load is different? And since red
Boosting Efficiency When Times Are Tough
2009-05-16 14:22:00 One way companies can cope with a tough economy is to get more efficient at what they do. Efficiency can be improved in a number of ways—employee training and education, investment in automation and advanced equipment, and reengineered business processes. All require some investment, but such
steam boiler efficiency
2009-05-15 11:08:00 main function of steam boiler is to release heat energy in fuel which absorbed by water .water absorbs heat and changed from liquid to steam with certain amount and pressure . my question how to calculate fuel consumption and boiler efficiency related to product steam under different pressure
Joint Efficiency and Pressure Vessel Design
2009-05-13 08:15:00 In pressure vessel design, joint efficiency 85%- what does it actualy mean in terms of manufacturing
Steam Turbines and Interstage Efficiency
2009-05-06 09:14:00 steam Turbine Extraction type forthe given pr. & temperature condition at inlet , extraction & Exhaust condition how to calculate interstage efficiency for turbine? Efficiency is calculated by using actual enthalpy/ideal enthalpy? how to consider steam losses?
Efficiency of a Hybrid System
2009-05-05 21:59:00 Hi All, I'm currently building a a hybrid system that contains a solar panel, an adjustable voltage regulator, Reversible Fuel Cell, DC-DC converter and and a DC-AC converter. The output of the solar panel is (17.82 V, 0.57 A, 10W) which I have connected to an adjustable voltage r
Efficiency of a Hybrid System
2009-05-05 16:39:00 Hi All, I'm currently building a a hybrid system that contains a solar panel, an adjustable voltage regulator, Reversible Fuel Cell, DC-DC converter and and a DC-AC converter. The output of the solar panel is (17.82 V, 0.57 A, 10W) which I have connected to an adjustable voltage regulator
Joint Efficiency
2009-04-21 10:47:00 While designig storage tanks with API650, is it not needed to apply joint efficiency?
Overall efficiency of gasoline powered cars
2009-04-12 02:58:00 Does anyone know what the overall efficiency of gasoline powered vehicles is, starting with the total energy value of the fuel to the actual delivered power to the road? For example, the energy content of 1 gallon of gasoline is 36.7 kilowatt hours or 49.24 horsepower hours. Can that be equated
Writing Effective Meeting Notes : Take Your Note-Taking Efficiency To New H
2009-04-09 19:12:00 Often I get pulled into unavoidable (sometimes unbearable) corporate experiences, called meetings. Some days, it seems like that only thing I have done is attend meetings! There was a time I used to scribble something on a notebook. I called it my meetings notes. (Basically, I had an accumulation of unprocessed meeting notes.)The ?wake up call? occurred one day when I spent about 20 minutes trying to find a ?meeting note page?, on a meeting I attended about a month ago! Worse part was that I couldn?t remember a single thing from that meeting. (Things did fall into place when I finally found the particular page though!)If you attend many meetings, track many projects, etc the benefit of note taking will be painfully obvious and taking meeting notes becomes a survival skill, naturally!Yet, I am surprised at how few people bother to take notes in meetings. Why Bother With Meetings Notes? 1. The value of the meeting (in most cases) is the action taken after everyone's left the meeting ...
By: Enhance Life
Writing Effective Meeting Notes : Take Your Note-Taking Efficiency To New H
2009-04-09 19:12:00 Often I get pulled into unavoidable (sometimes unbearable) corporate experiences, called meetings. Some days, it seems like that only thing I have done is attend meetings! There was a time I used to scribble something on a notebook. I called it my meetings notes. (Basically, I had an accumulation of unprocessed meeting notes.)The ?wake up call? occurred one day when I spent about 20 minutes trying to find a ?meeting note page?, on a meeting I attended about a month ago! Worse part was that I couldn?t remember a single thing from that meeting. (Things did fall into place when I finally found the particular page though!)If you attend many meetings, track many projects, etc the benefit of note taking will be painfully obvious and taking meeting notes becomes a survival skill, naturally!Yet, I am surprised at how few people bother to take notes in meetings. Why Bother With Meetings Notes? 1. The value of the meeting (in most cases) is the action taken after everyone's left the meeting ...
By: Enhance Life
3D Solar Cells Boost Efficiency While Reducing Size, Weight and Complexity
2009-04-04 13:19:00 3D Solar Cells Boost Efficiency While Reducing Size, Weight and Complexity of Photovoltaic Arrays
By: dynamics
From 40.7 to 42.8 % Solar Cell Efficiency - Renewable Energy World
2009-04-04 13:07:00 From 40.7 to 42.8 % Solar Cell Efficiency - Renewable Energy World
By: dynamics
Syncronous vs inductive motor efficiency
2009-03-31 00:35:00 Question out of curiosity: I have 8000 hp syncronous motors driven by Siemens GTO drives. We are looking at replacing the system with Induction motors and associated drives. I was asked if Syncronous motors are more efficient than induction. I have looked for an answer in text books and can not
Efficiency: Syncronous Motors vs. Induction Motors
2009-03-31 00:35:00 Question out of curiosity: I have 8000 hp syncronous motors driven by Siemens GTO drives. We are looking at replacing the system with Induction motors and associated drives. I was asked if Syncronous motors are more efficient than induction. I have looked for an answer in text books and can
Fiber Optic Specs and Efficiency
2009-03-28 21:57:00 Hi all, I am doing a project that requires detailed specifications on a fiber optic cable I have. It is an RCA Fiber Optic cable with a product code dt3hp. I am trying to shine a 5mW and 532 nm laser though the cable and determine the power and beam diameter on the output. I am also curious if
Axial Fan efficiency vs Centrifugal fans efficiency
2009-03-23 18:38:00 Hi, Fan Parameters: 1. Flow: 3000 cmh, 2. Diameter: 350 mm, - For centrifugal fan: I can achieve following parameters: A. Pressure: 100 Pa B. Power: 160 Wat
Chilling Plant Efficiency - 15 TR and R22
2009-03-23 08:10:00 We are having 15 TR chilling plant and refrigerant is R22 (Freon) and media is brine solution (Methanol). I want to know the calculation of efficiency of chilling plant which will be used for me to calculate any chilling plant used in Industry. |
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