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Moss/Lichen on roof, now we are into pollution.
"Bob Hobden" wrote in message ... "IMM" wrote in message Vehicles "are" a very large polluters, especially when they are concentrated in cities, where masses of people live. Great progress is being made on pollution from homes, in insulation standards, boiler efficiency , etc, yet there appears no immediate solution to the filthy car. Sorry!? I think you have that the wrong way round. No. The laws on vehicle pollution continue to get tougher and tougher and the manufacturers have had to comply to continue to sell vehicles. Not tough enough, the Internal combustion engine is only around 30% efficient, and the emissions are highly polluting because of the small explosions it creates (not continuous burn). There has been massive strides in reducing pollution from cars, per mile travelled. They are still highly inefficient and pollute heavily. Catalytic Converters, Electronic Engine Control, lean burn engines, two stage ignition, direct petrol injection, particle traps etc with more to come. They are twiddling around the edges of a flawed highly inefficient design. We are significantly reducing overall pollution figures despite a massive increase in vehicles, now all we need to do is get rid of all those old polluting buses. Pollution is still high and efficiency woefully low. As for central heating, I thought the figures were they produced 80% of the greenhouse gasses produced in this country. Not in a million years. CH output is very low. Natural gas is the main CH fuel, and this is the cleanest fuel by a mile. Technology is there to make boilers very efficient and very clean burning, at no great cost, also by increasing insulation standards, a homes emissions can be drastically reduced. This can be done right now and people wonder why it is not being implemented. The car? Well apart from taxing larger engines, not much at all can be done. There are some advanced concept engines around, but the big corps have not yet taken up these ideas, tending not wanting any change at all. Not much can be done about cars? What about the exhaust emmissions laws which have worked amazingly and conuinue to get tougher, the MOT emissions tests, that's a damn sight more than is happening with central heating. Emission equipment still is just twiddling around the edges. See above. Some people use boilers that are decades old and with no maintanance. A natural gas boiler can go for many, many years and still be quite clean burning. Modern boilers are super efficient, and emissions super clean too. The efficient of gas boilers rose by about 30% in a few years. Lets see if GM can do that with a sill piston engine. Fact is... All the major manufacturers and significant others are working flat out on Fuel Cell engines which produce no pollution except steam. MIT realsed a paper that fuel cells research has not come up with the goods and diesel and gasoline engines will have top fill the bill in the short to medium term. The US government gave billions to auto makers to squander. They don't want change. They should not be given research money at all. The technology should researched by other organisations and legislation to make them adopt the technology. Meanwhile they continue to develop even cleaner reciprocating engines. Still twiddling around the edges. No major breakthroughs yet, despite some nice, more efficient, and running, concept engines around. http://conceptengine.tripod.com/ http://www.deadbeatdad.org/eliptoid/ The Russians have come up a Rotary engine that is the reverse of the wankel, Instead of a an elliptical chamber and triangular rotor, it is the reverse. the seals are in the engine block, and can be readily changed. Good for Heat and power applications. The Russians make two normal Wankel engines for aircraft and helicopters. The Australians have come up with a good improvement on the piston engine, not using a crank shaft and or swivelling con-rods. No real figures as yet, but production imminent. An auto engine is currently being tested in a Proton car donated by Proton. http://www.revetec.com/website/ Cars are even dirtier until the engine and exhaust is hot. So, in many cases, when the car is used to go to Safeway or the school run, the thing is hardly up to temperature before being switched off. In this period they pollute heavily. The current piston internal combustion engine needs totally replacing. True but that's as much a social problem. No. the engine is highly polluting until fully hot which takes many miles. --- -- Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.558 / Virus Database: 350 - Release Date: 02/01/2004 |
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