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Text of the page (random words):
o the author of the long emergency speak of how we are running out of oil and that buildings over 7 stories were going to go away because we wouldn t have the energy to run elevators i wondered how much energy it took to run an elevator i think this guy is a quack and history will prove him wrong but i still wanted to know if there was anything to what he said when i found this otis elevator energy use calculator i decided to investigate 1 how much electricity does a typical high rise apartment dweller use in elevator trips in a month assuming you are traveling 20 floors making 2 round trips a day you would use 5 8 kwh a month calculations below at 07 a kwh this would be 40 worth of electricity to put that in perspective my refrigerator uses approximately 52 kwh a month and the average home uses 888 kwh a month or 153 times as much so it is not very much 2 how much electricity is used per round trip per floor and per km per round trip 20 floors 100 wh this is about how much a desktop computer and monitor use running for 30 minutes per floor one direction 3 meters 2 5 wh that is approximately 1 2 the amount of energy it takes to recharge a cellphone battery per km 800 wh to put this in perspective the tesla roadster electric uses 110 wh per km a counter weighted elevator is therefore about 1 7 as efficient as the tesla roadster per km then again the elevator goes up and down while the roadster travels on flat land 3 does reducing your use of elevator trips make sense for health reasons probably walking up a couple of flights of stairs a day is good excerise and your heart will be happy with you but in terms of reducing energy usage for environmental reasons not really there are many other things that are much easier to do that would have bigger impacts changing 3 100 w light bulbs to cfls would save more electricity than the typical apartment dweller going cold turkey on elevators if you were to walk up and down 3 flights of stairs instead of an elevator that would save 15 wh a day or 450 wh a month that would be enough to power a 37 plasma tv for 3 hours it is something but not much if you wanted to save energy you would be better off trying to walk or take public transportation to work if living in a high rise in a dense urban environment allows you to save more than 1 gallon of gasoline due to decreased driving the elevator usage more than pays for itself in energy savings after all this analysis i am left with the same thought that i had when i started this elevators don t use much energy and that long emergency guy is seriously bonkers calculations data was gathered from the otis elevator energy use calculator they use the following assumptions 1 residential building each user performs 2 runs per day up and down each run as a rule corresponds to half of the elevator s total rise each floor as a rule is 3 m high in part of the runs the elevator does not spend energy as i understand it each run is an up and down so this means there are 4 single leg journeys a day i believe this assumes that you are the only person in the elevator each time you take it this might over estimate the total as sometimes you share a ride on the other hand sometimes you are on the ground floor and the elevator has to travel many floors to get to you so this would under estimate the total hopefully they more or less cancel each other out i entered the following values car capacity 20 people number of stops including main entrance and basements 41 total population of the building 1000 people number of elevators that serves this population 1 there are many types of elevators that it calculates for variable frequency type controller gearless machine current technology 5777 kwh month ac type controller geared machine and hydrolic old technology 8888 kwh month gen2 elevator system machineroomless latest technology 4493 kwh month i chose to go with the current technology but numbers can be adjusted accordingly as 1 1000 of the people one persons total comes to 5 777 kwh a month since the run corresponds to 1 2 the total rise 41 stops means that you travel 20 floors from the 1st to the 21st which is 60 meters 5 8 kwh 60 trips 2 trips a day 30 days a month 1 kwh 120 meters double for up and down 8 wh a meter 800 wh a km update i found this post on askpablo about energy use of elevators he puts the energy needed to travel one floor at 1 5 wh this is a bit lower than my 2 5 wh estimate but in the same ballpark read more summary only at 2 21 2007 39 comments labels energy environmentalism air traffic management efficiency environmental responsibility every minute of flying time that we can save reduces fuel consumption by an average of 62 litres and co2 emissions by 160 kilogrammes governments are quick to make vacations more expensive with new taxes in the name of the environment but they are slow to improve the infrastructure it s about time they realised what a difference a minute can make said iata director general and ceo giovanni bisignani the intergovernmental panel on climate change ipcc estimates that there is 12 inefficiency in air traffic management globally that means up to 73 million tonnes of wasted co2 emissions and nearly us 13 5 billion in wasted costs said bisignani iata s work to optimize 350 routes in 2006 yielded 6 million tonnes of co2 savings but that is only the tip of the iceberg we see issues in all continents the approach to hong kong is up to 25 minutes longer than it needs to be flying from sao paolo to lima is 9 minutes too long johannesburg to london is 10 minutes too long and flying to manila from japan has 5 unneeded minutes optimizing routes should not be a battle it s a win win situation for the passenger and for the environment said bisignani if we can reduce co2 emissions while making air flight faster that seems like a no brainer via iata via green car congress read more summary only at 2 21 2007 0 comments labels energy environmentalism tuesday february 20 2007 computer servers use 1 2 of total us electricity i have written before how server farms are replacing aluminum refining as the major users of cheap electricity this report looks at the extent of server energy use total power used by servers represented about 0 6 of total u s electricity consumption in 2005 when cooling and auxiliary infrastructure equipment are included that number grows to 1 2 an amount comparable to that for color televisions the total power demand in 2005 including associated infrastructure is equivalent in capacity terms to about five 1000 mw power plants for the u s and 14 such plants for the world the total electricity bill for operating those servers and associated infrastructure in 2005 was about 2 7 b and 7 3 b for the u s and the world respectively aggregate electricity use for servers doubled over the period 2000 to 2005 both in the u s and worldwide if power per server remains constant those trends would imply an increase in electricity used by servers worldwide of about 40 by 2010 if in addition the average power use per unit goes up at the same rate for each class as our analysis indicates that it did from 2000 to 2005 total electricity used by servers by 2010 would be 76 higher than it was in 2005 and these numbers are probably an underestimate as they don t take into account networking equipment and tape backups it also doesn t include google as they don t use server class machines in their server farms ironic isn t it if you include google they estimate it would raise the total worldwide electricity use by servers 1 7 there are 10 306 servers in the us and 27 282 in the world us has 37 of the world s total this works out to 1 server per 30 000 americans the servers use 45 billion kwh of energy per year in the us and 123 billion kwh worldwide this works out to 150 kwh per american via business 2 0 pdf via ecoiron read more summary only at 2 20 2007 0 comments labels energy monday february 19 2007 bionic eye restores sight to the blind a bionic eye that can restore sight to the blind should be available commercially within two years scientists behind the revolutionary technology announced yesterday the artificial retina has been cleared by us regulators to begin trials on between 50 and 75 people suffering from two of the most common causes of blindness opening the way for millions more to benefit from similar implants in the future if the research progresses well a device could be on the market early in 2009 at a likely cost of about 15 000 said mark humayun professor of ophthalmology at the doheny eye institute part of the university of southern california an early version of the prosthetic retina has already been fitted to six patients with retinitis pigmentosa a degenerative and incurable eye condition that affects 1 in 3 500 people all have recovered the ability to detect light and motion and even to make out large letters and to distinguish between objects such as a cup a knife and a plate the second generation device that is now starting trials should provide even better vision as it contains 60 light sensitive electrodes compared with 16 in the previous model more improvements are expected within five to seven years with a 1000 electrode implant that will enable previously blind people to recognise faces professor humayun said the bionic eye consists of three elements first a miniature camera worn in a pair of dark glasses which transmits images to a radio receiver implanted near the patient s eye this then sends a signal on to a tiny silicon and platinum chip about 4mm square that sits on the retina the chip s electrodes stimulate the ganglion cells that transmit visual information to the optic nerve and onwards to the brain which can then construct a visual image good stuff if they are able to go from 60 to 1000 in 5 years that is an increase of 75 a year if they can keep that up for an additional 14 years they get to 2 million electrode implants that give you 1080p hd resolution once we get there sign me up baby via times online read more summary only at 2 19 2007 1 comments labels cyborgs tesla motors to build electric sports sedan tesla motors will build its new automobile assembly facility in albuquerque new mexico construction on the 150 000 square foot plant will begin in april 2007 at the latest the new mexico plant will be the company s first assembly facility in the united states and will produce the whitestar an upcoming four door five passenger all electric sports sedan the first cars will roll off the assembly line in the fall of 2009 and tesla motors will produce at least 10 000 cars each year the vehicles will cost 50 000 for the standard model or 65 000 for a premium model with greater performance and range this is all part of tesla s secret master plan looks like they are shooting to release their sports sedan in fall of 2009 not quite the 2008 they were hoping for earlier but not that far off 10 000 is a nice size to produce and a couple of magnitudes of order higher than the 100 roadsters they are rolling out this year 50 000 is a good price decrease from the 100 000 the roadster but still pricey for sports sedan then again if you are only paying 01 a mile for electricity rather than the 10 a mile you pay with 2 gasoline and a 20 mpg car the extra cost might pay for itself over the lifetime of the car the key thing for me is the range the batteries will get if it is close to the 250 miles of their roadster i think this vehicle will be a big winner in the marketplace via green car congress read more summary only at 2 19 2007 0 comments labels environmentalism thursday february 15 2007 jevons paradox in economics the jevons paradox is an observation made by william stanley jevons who stated that as technological improvements increase the efficiency with which a resource is used total consumption of that resource may increase rather than decrease in his 1865 book the coal question jevons observed that england s consumption of coal soared after james watt introduced his coal fired steam engine which greatly improved the efficiency of thomas newcomen s earlier design watt s innovations made coal a more cost effective power source leading to increased use of his steam engine in a wide range of industries this in turn made total coal consumption rise even as the amount of coal required for any particular application fell i just finished reading winning the oil endgame while i thought the ideas on how to conserve oil were good i wondered if jevons paradox would come into play as cars became more efficient with oil would this lead to people driving larger cars and driving further offsetting any oil reductions seems like you need a tax on gasoline as well to overcome jevons paradox via wikipedia read more summary only at 2 15 2007 0 comments labels economics energy environmentalism interesting articles of the week does the world have enough lithium to allow us all to drive electric cars a father attempts to hack his child s brain to help with his sensory processing disorder viruses not prions may be at the root of diseases such as scrapie bse and variant creutzfeldt jakob disease vcjd researchers say former fed chairman paul volcker supports oil or carbon emissions taxes to combat global warming and says the argument that they would ruin an economy was fundamentally false gtc biotherapeutics is among several companies worldwide perfecting the art of pharming genetically modifying animals to churn out drugs for disorders like hemophilia and cancer read more summary only at 2 15 2007 2 comments labels interesting articles free roads are anything but free historically we ve spent billions on roads and provided them for free this approach has given us endless traffic jams because as any former soviet commissar can tell you if prices are too low endless queues follow our free roads end up being anything but free as massive congestion causes us to pay with time instead of cash tolls should be used to charge people for the congestion they create if i drive during peak hours i slow everyone else down congestion based tolls help us make the right decision about when and how often to drive granted if we just raise tolls on major highways like the turnpike then we push people onto the already crowded side streets knowing that london mayor ken livingstone in 2003 introduced a congestion charge throughout much of his city that led to an 18 percent reduction in traffic and a 30 percent drop in congestion the change made the city more livable especially for lower and middle income residents who rode buses i hate traffic and would definitely be willing to pay tolls to avoid it even more so if the toll money could be used to offset other taxes i pay via boston globe read more summary only at 2 15 2007 0 comments labels economics wednesday february 14 2007 the fastest xp prank ever genius i love it via metacafe via digg read more summary only at 2 14 2007 0 comments labels funny technology video monday february 12 200...