Very cheap solar power
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From: jimp on 3 Feb 2010 19:14 In sci.physics habshi(a)anony.net wrote: > BBC today showed a great method of cooling . Water is > sprinkled over charcoal in permieter wall a few inches thick. The sun > evaporates this water and carries heat away . Temp falls from 30 to > 18C ie comfortable. This is called evaporative cooling and has been known to the rest of the world for thousands of years. You are still an idiot. -- Jim Pennino Remove .spam.sux to reply.
From: BradGuth on 3 Feb 2010 19:43 On Feb 3, 4:14 pm, j...(a)specsol.spam.sux.com wrote: > In sci.physics hab...(a)anony.net wrote: > > BBC today showed a great method of cooling . Water is > > sprinkled over charcoal in permieter wall a few inches thick. The sun > > evaporates this water and carries heat away . Temp falls from 30 to > > 18C ie comfortable. > > This is called evaporative cooling and has been known to the rest of the > world for thousands of years. > > You are still an idiot. > > -- > Jim Pennino > > Remove .spam.sux to reply. The physics and science of evaporative cooling isn't known by the vast majority of our K12s. ~ BG
From: J. Clarke on 3 Feb 2010 22:07 habshi(a)anony.net wrote: > BBC today showed a great method of cooling . Water is > sprinkled over charcoal in permieter wall a few inches thick. The sun > evaporates this water and carries heat away . Temp falls from 30 to > 18C ie comfortable. > So maybe during the summer we can clad a building with a > charcoal coating and let water sprinle on it . > > http://www.bbc.co.uk/programmes/b00nmt73 Google "swamp cooler". Only works when the humidity is very low.
From: DanB on 4 Feb 2010 01:06 J. Clarke wrote: > habshi(a)anony.net wrote: >> BBC today showed a great method of cooling . Water is >> sprinkled over charcoal in permieter wall a few inches thick. The sun >> evaporates this water and carries heat away . Temp falls from 30 to >> 18C ie comfortable. >> So maybe during the summer we can clad a building with a >> charcoal coating and let water sprinle on it . >> >> http://www.bbc.co.uk/programmes/b00nmt73 > > Google "swamp cooler". You must be clear. Hashbrains doesn't know what google is. He pretends to need baby steps. Wait, the sign of a troll! Gee....
From: habshi on 5 Feb 2010 20:38
If the govt sticks to its words then within five years solar panels will cover every british roof and save billions of liters of oil and gas each year excerpt guardian.co.uk If the government offered to pay you �1,000 a year for the next 25 years, in return for an up-front investment of �12,500, you'd snap it up in a second. Well, that's pretty much the deal on offer this week after the government finally revealed what it will pay those who install electricity generating solar panels � in and around their homes � through the new "Feed-in Tariffs" (FITs). After years of campaigning by environmental groups � helped in small part by this newspaper � the government has finally agreed to reward households and businesses installing electricity-generating measures with enough of a return to make it a serious financial, as well as an environmental, investment. If you've got the money (which is a big "if") and, crucially, a sunny, south-facing roof, you can earn a 7%-10% tax-free return, an income that will rise in line with inflation. At the same time, you get to do more than your fair share in reducing the UK's carbon� emissions. In the week that the energy regulator,� Ofgem, warned the nation to expect 20% electricity price hikes by 2020, and warned future supplies were in jeopardy, investors in solar panels will have the added benefit of being a net provider of electricity, and largely insulated from future price hikes that could see household bills top �2,000 a year by 2020. Announcing the new tariffs' introduction this week, the energy and climate change secretary Ed Miliband said the guaranteed income would be a big incentive for householders "to make the move to low carbon� living".� "The feed-in tariff will change the way householders and communities think about their future energy needs, making the payback for investment far shorter than in the past." Although Milliband announced a number of tariffs � including what the government will pay those installing wind turbines � the one that will appeal most to the average UK householder will be for installing photovolatiac (PV) solar panels � at a typical cost of �10,000-�12,500. From 1 April, households with approved� schemes will be paid for the electricity they generate, even if they use all of it themselves. The level of payment depends on the technology and whether it is being fitted to an existing� home, or installed as part of newbuild. Importantly, future payments are guaranteed for the next 25 years and have been, unexpectedly, linked to inflation. Anyone fitting a typical �12,500, 2.5kW PV system to their existing home will initially be paid 41.3p per kilowatt hour (kWh) generated. Enough, according to Miliband, to reward them with up to �900 in the first year on top of a �140-a-year saving on their bills. The measure, which is inevitably quite complicated, is designed to reward those who reduce their own electricity consumption by installing low-energy lighting and A-rated white goods, and to ultimately export excess electricity generated back to the grid. Households get an extra 3p for each kWh they export on top of the 41.3p they get paid for all units generated. Those building PV roof panels into a new-build home get a slightly lower tariff (36.1p per kWh). The fact that the payments are not taxed make it a particularly rewarding investment for higher-rate taxpayers � those earning more than just over �43,000. Regulated payments We estimate homeowners can save and earn more than �1,000 per year for 25 years, increasing with inflation, giving a payback in around 10 years." He says homeowners with flat roofs may well find they can install a system, as will those with conventional roofs that face a few degrees either side of south, east or west. Panels perform best in unshaded sites angled towards the sun at a pitch of 30-40 degrees. Ashley Seager went solar three years ago I fitted solar photovoltaic panels on my house nearly three years ago. They are great � we get 90% of our electricity off our own roof over the course of the year. And three years ago the panels were more expensive than they are now. We spent �17,000 but got half of that back in a grant from the Low Carbon Buildings Programme, which was dogged by complexity and stop-go �decisions by the government. It is much easier now. You install the solar panels or wind turbine and away you go � no messing about with grant applications that take months. But, undeterred, I am looking at fitting solar thermal panels elsewhere on the roof to generate most of our hot water. That is because, as well as announcing the cashback for green electricity schemes, DECC also published its proposals for payments for renewable heat gear such as solar thermal or ground source heat pumps. I reckon that from next April a normal solar thermal system could generate around �200 a year, based on the 18p per kWh DECC is proposing. Added to the �150-odd you save in heating water, you approach a 10% return, assuming you pay �3,000-�3,500 for your thermal system. Go for it! Perhaps more importantly, it has said it will be giving feed-in tariffs to households installing solar water heaters, from April 2011. These are much cheaper (�3,500). There's also help for air and ground-source heat pumps. Money will be returning to this subject in forthcoming articles. |