Home  5  Books  5  GBEzine  5  News  5  HelpDesk  5  Register  5  GreenBuilding.co.uk
Not signed in (Sign In)

Categories



Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
These two books are the perfect starting place to help you get to grips with one of the most vitally important aspects of our society - our homes and living environment.

PLEASE NOTE: A download link for Volume 1 will be sent to you by email and Volume 2 will be sent to you by post as a book.

Buy individually or both books together. Delivery is free!


powered by Surfing Waves




Vanilla 1.0.3 is a product of Lussumo. More Information: Documentation, Community Support.

Welcome to new Forum Visitors
Join the forum now and benefit from discussions with thousands of other green building fans and discounts on Green Building Press publications: Apply now.




    • CommentAuthorCWatters
    • CommentTimeMay 19th 2008 edited
     
    ..according to article in the Times today. They report on tests carried out by Auto Express Magazine.

    It would seem that David Cameron's Hybrid Lexus achieves worse mpg figures (only 26.7mpg) than something like the diesel version of the Ford Galaxy which is a seven seat people carrier that achieves 36-42mpg in real world driving.

    http://www.timesonline.co.uk/tol/news/environment/article3958376.ece

    The Focus diesel/electric hybrid did a bit better at 46mpg but I wonder what a standard focus diesel achieves?
    • CommentAuthorTheDoctor
    • CommentTimeMay 19th 2008
     
    i would want far better performance than 46mpg from a hybrid.

    for a car as small as a Focus, that is absolutely p*ss-poor, and I would imagine it is easily achievable in their bog-standard diesel model.

    I achieve this easily in a 2 litre 407 diesel estate (I average around 45mpg, and get 48-52 over long journeys.


    for a small car with 'whizzo' technology, i would be extremely disappointed not to see 60+mpg as a minimum.

    it is not all about the technology, but about driving style. If you drive a hybrid with a heavy foot, you are going to get poor performance. A driving style with an eye for economy should be richly rewarded by a hybrid.
    slamming on the breaks as you screech up to a set of reds is a waste of embodied energy. wherever it came from.
  1.  
    There's me thinking hybrids were supposed to use regenerative braking! There was as a similar article a short time ago where a Prius and a BMW 5 series were driven to Geneva, and around the city for a bit. While, the BMW did win on fuel consumption, I still think the Prius was marginally better for CO2. Even accepting that the Prius will have to have replacement batteries at about 100,000 miles, I still think it has lower CO2 emissions than a BMW 520d, though admittedly not by much.

    T

    T
    • CommentAuthorTheDoctor
    • CommentTimeMay 19th 2008
     
    regenerative breaking will recover some of the energy lost. Far from all of it, however.

    too many "i've done my bit" Daily Mail readers are buying hybrids to score a green point or two over Mrs Miggins next door, but are incapable of driving economically, and still charge around as if they were in their BMW X5

    the hybrid is a tool, like any other, and it must be used correctly to achieve its optimum function

    a fancy pair of running shoes doesn't finish the marathon for you!
  2.  
    In what way is driving a hybrid economically different from driving say, a BMW 520d economically?

    T
    • CommentAuthorchuckey
    • CommentTimeMay 19th 2008
     
    I thought that the advantage of a hybrid was only in stop-start motoring. On a motor way you are running on the "proper" engine any way, and you are carting around 1/2 ton of batteries/ electric motors/ cabling/ electronics. I think what we need are KISS vehicles. Make 'em light and simple. My 1959 Austin Healey Sprite would do over 50 mpg, also My 1996 VW Passat, will do that as well (nursing it along at 45 mph on a motorway), despite the fact thats its twice the weight. Now if one put the VWs engine into the Sprite, lots of MPG possible (and mph!!).
    Frank
  3.  
    Hybrids need to be driven in the correct way as any vehicle, they are more powerful and efficient if driven correctly.

    However they do produce the best results "round town" as the batteries are not powerful enough for high speed motoring....Yet.

    This would all be irrelavent in 10 yrs or so when an act of government may finally means fuel cell
    cars. I am sure Toyota could churn one out very quickly if they had to.
  4.  
    Chuckey,

    The weight gain is negated by the lack of gearbox on a full Hybrid. Dont forget there are 3 types Micro, Mild and full.
    • CommentAuthorbiffvernon
    • CommentTimeMay 20th 2008 edited
     
    Posted By: CWatters.something like the diesel version of the Ford Galaxy which is a seven seat people carrier that achieves 36-42mpg in real world driving.
    I happened to have a ride in a Ford Galaxy yesterday from Cumbria to Lincolnshire, mostly along motorways at 70mph. We were playing with the little fuel consumption gizmo and ended the trip with it recording 49.9 mpg, much to the owner's irritation as she was trying to get it to 50 and coasted the last few hundred yards in neutral, to no avail.
    • CommentAuthorStuartB
    • CommentTimeMay 20th 2008
     
    "(nursing it along at 45 mph on a motorway)" Frank - this is very dangerous driving and would lead to loads of accidents, extra MPG is not much use if you have an HGV rammed in your rear.

    Most manufacturers do a family diesel that will achieve 50mpg if not driven like an F1 car, small family diesels can achieve 60mpg. These are perfectly acceptable environmentally responsible cars to run until technology improves enough so that we don't have to rely on petrol or diesel for the majority of our motoring power.
    • CommentAuthorbiffvernon
    • CommentTimeMay 20th 2008
     
    >perfectly acceptable environmentally responsible cars

    What? While CO2 levels remain as high as they are (and still rising), any CO2 emitting car is not perfectly acceptable environmentally responsible.
    But since we are not environmentally responsible we will keep driving until we can't afford the fuel, by which time it will all be much too late.
    • CommentAuthorStuartB
    • CommentTimeMay 20th 2008
     
    With what is currently available for the mass market globally these are the best option. There will be a significant period of transition until we switch to less polluting cars, until then high mpg, low CO2 diesels are the way forward.

    What is the alternative for mass market? It takes about 7 years from concept to launching a new car. You can't just stop driving any car that emits CO2, the worlds economy would collapse! We will need to drive polluting cars for many years to come until technology develops further.

    What we do have the power to do is demand that our cars are less polluting and the manufacturers will start building these engines. Less polluting, high mpg cars are now in demand, unfortunately that means paying a premium.
    :sad:
    • CommentAuthorStuartB
    • CommentTimeMay 20th 2008
     
    On the subject of having to pay a premium due to increased demand. I remember 20 years ago when I started driving that diesel was about two thirds the cost of petrol and pretty much the only diesel vehicles on the road were lorries, vans and taxis.

    Now that performance of diesel engines has improved so much and sales are matching those of petrol engines you would think that the price of diesel should have gone down. Greater demand for diesel should reduce the cost to the consumer due economies of scale, competition etc. However diesel is now £1.25lt and petrol £1.09lt. Is this just one massive rip off by the oil companies?
    •  
      CommentAuthorted
    • CommentTimeMay 20th 2008
     
    Diesel is £1.329 at my local garage this week - price seems to change weekly now.

    How is the 16p/litre price differential over unleaded justified? That's 72p per gallon.

    I understand that diesel is more expensive to refine - or so the oil companies are quick to tell us - but surely not by that margin?
  5.  
    I think its a tax thing, the government made the decision a few years back that the sulphur emissions of diesel ment it warrented a higher tax than petrol, or at least that was their excuse at the time. So, the idea is to dissuade people from using diesel!
    • CommentAuthorTheDoctor
    • CommentTimeMay 20th 2008
     
    apparently there is currently a UK diesel refinery capacity shortage as well at the moment - allegedly
    • CommentAuthorbiffvernon
    • CommentTimeMay 20th 2008 edited
     
    It's not a tax thing nor a UK thing but a global issue based on the design of refineries, some built a long time ago, the changing ratio of light sweet to heavy sour crudes, as the best easy oil gets used up, increased demand from road transport and the conversion of the shipping fleet from heavy oils to diesel.

    WTI reached a new record of $127.82 earlier this afternoon. It takes a few weeks for the forecourt price to really reflect crude prices so don't expect our diesel to get cheaper.

    edit: oops, $128.19 now.
  6.  
    from www.petrol prices.com:


    "Despite these reductions in sulphur emissions, standard diesel fuel is still taxed more heavily than petrol. In 1994, duty on diesel and unleaded petrol (ULP) was the same, however from 1996 through to 1998 diesel was around a penny per litre more expensive. In 1999 it became three pence per litre. At this stage, ultra low sulphur diesel (ULSD) was introduced into the market and, by 2000 the majority of diesel being sold changed to ULSD. This carries a lower duty rate than standard diesel, and by 2001 the differential between standard diesel and ULSD was up to six pence per litre. However, since 2003 high oil prices have caused the duty on all fuels to rise drastically. In the last 2½ years alone a tripling in oil price has caused the price of fuels to rocket, and it seems to have been the case that diesel users have suffered more than the rest of us. If this were the whole picture though, then fuel would be as expensive everywhere as it is here in the UK.

    The fact of the matter is that, even with the hike in oil prices, almost three quarters of the petrol station price for any given fuel is government duty. Considering that Britain’s motorists buy over 30 billion litres of fuel a year, that’s a lot of tax."
  7.  
    <blockquote><cite>Posted By: biffvernon</cite>It's not a tax thing nor a UK thing</blockquote>

    Edmund King, the president of the AA, said: "We may be pleased that we have two English teams in the Uefa Champions League final but it is more worrying that we are top of the European fuel taxation league in terms of unleaded petrol and diesel."

    A study from accountants Grant Thornton shows that the rise in oil prices will see the Treasury take over £1 billion extra in VAT on petrol – more than would have been garnered from the 2p duty rise.

    and from the BBC:

    " The European Commission has drawn up plans for a harmonised European diesel duty which, if implemented, would make the fuel cheaper for road users in the UK.

    Under the proposals, European Union governments would be obliged to tax diesel at a common rate of about 350 euros (£224) per 1,000 litres, the Financial Times reported on Monday.

    The UK government would have to halve its current diesel duty of about 700 euros per 1,000 litres, cutting tax revenues by about £6bn a year, in order to comply.

    Diesel duties would also be cut in Germany and Denmark, but would rise steeply in Portugal and Greece."
    • CommentAuthorbiffvernon
    • CommentTimeMay 20th 2008
     
    Yes of course there's loads of tax, but my point was that the recent differential increase we have seen in the past several weeks reflects a global diesel shortage resulting from the factors I outlined above.

    btw WTI went up to $129.31 this afternoon, yet another record broken.
    •  
      CommentAuthorfostertom
    • CommentTimeMay 20th 2008
     
    I followed the chain of argument in the www.petrolprices.com quote until
    Posted By: bot de pailleHowever, since 2003 high oil prices have caused the duty on all fuels to rise drastically
    duty is pence per litre, independent of price. VAT (not duty) will have gone up pro rata with price, but applying equally to all fuels. So neither this, nor the following bot de paille post quote explain
    recent relatively higher diesel prices through duty or tax.
  8.  
    Because of the way that diesel and petrol is double taxed, including VAT.
    The tax on diesel is higher because claims the government, it releases sulphur. Because of the way the double tax is applied by the government, when prices go up, the tax regime imposed on fuel is amplified. because the tax on diesel is higher the ampliefied effect on diesel is more.
    this is why, as reported by the BBC, the recent oil rises have also netted the UK government 1 £billion extra in tax.

    in spain you can still buy petrol for 1 euro a litre, their tax regime has not amplified the fuel prices as much as in the UK.
    •  
      CommentAuthorfostertom
    • CommentTimeMay 20th 2008 edited
     
    Posted By: bot de paillewhen prices go up, the tax regime imposed on fuel is amplified
    No, in fact the reverse. When the ex-refinery price goes up, sure, VAT goes up pro rata, but duty stays unchanged (until the next Budget) because it's per litre, regardless of price. So far from amplifying price rises, the tax regime cushions and reduces the proportional rise seen by the end-user. And until and unless the govt deliberately puts a higher rise on diesel duty than on petrol, the tax regime doesn't explain diesel getting more expensive relative to petrol - again, the reverse, between Budgets the tax regime will tend to converge their end-user prices. If diesel's end-user price has risen faster than petrol, that must be mainly because ex- refinery price has been raised faster by the producers, plus some duty tinkering at Budget time.
  9.  
    the uk has the highest fuel tax in the world

    the UK taxes diesel higer than petrol

    every other european country the price of diesel is lower than petrol, from the AA:

    out of 26 countries, only in the UK, US and Ireland is the price of diesel higher than petrol

    Country Currency Unleaded Diesel Unleaded Diesel
    Austria Euro - - 1.171 1.096
    Belgium Euro - - 1.433 1.158
    Finland Euro - - 1.322 1.061
    Germany Euro - - 1.372 1.226
    Greece Euro - - 1.032 1.029
    Netherlands Euro - - 1.470 1.138
    Italy Euro - - 1.330 1.286
    Luxembourg Euro - - 1.131 0.971
    Spain Euro - - 1.057 0.974
    France Euro - - 1.295 1.115
    Ireland Euro - - 1.152 1.104
    Portugal Euro - - 1.314 1.114
    Slovenia Euro - - 1.000 0.994
    Sweden Swedish Krona 11.94 11.54 1.292 1.248
    Estonia Kroons 13.20 12.90 0.843 0.824
    Latvia Lats 0.653 0.625 0.950 0.909

    Slovakia Koroan 38.04 38.81 1.144 1.167
    Switzerland Swiss Franc 1.75 1.82 1.044 1.086
    GB Sterling 0.990 1.019 1.425 1.466
    USA US Dollars 0.729 0.80 0.503 0.553
    Northern Ireland Pound Sterling 0.981 1.001 1.411 1.440
    Norway Norwegian Krone 12.10 10.80 1.514 1.351
    Poland Zloty 4.30 3.85 1.124 1.007
    Hungary Forint 282.6 270.0 1.152 1.101
    Czech Republic Czech Koruna 29.90 28.70 1.080 1.037
    Denmark Danish Krone 9.99 9.13 1.343 1.227
    •  
      CommentAuthorfostertom
    • CommentTimeMay 21st 2008 edited
     
    Not disputing (if you says so) that
    Posted By: bot de paillethe uk has the highest fuel tax in the world

    the UK taxes diesel higer than petrol

    every other european country the price of diesel is lower than petrol
    but you and www.petrol prices.com were saying that diesel rising faster than petrol was due to some automatic effect of the duty + VAT dual tax regime - it's not, the reverse in fact. It's now clear that expensive diesel is not due to production cost factors, as Biff was saying, cos it doesn't happen elsewhere, but solely due to deliberate UK/IR/US govt decision at Budget time after time to escalate diesel duty (p/litre) faster than petrol. Why, indeed, that's the question.
    • CommentAuthorStuartB
    • CommentTimeMay 21st 2008
     
    From the BBC

    "Diesel cars, which are more economical, now total 40% of all UK car sales, up from 10% in 2000, said the Society of Motor Manufacturers and Traders (SMMT)."

    http://news.bbc.co.uk/1/hi/business/7174856.stm

    So if you sold diesel for a living and you were part of a cartel who controlled prices in the UK and the market you were selling into was to grow from 10% to 40% in 8 years wouldn't you be tempted to raise your prices to cash in? We are all being screwed by the big oil companies. Always have been and always will until the stuff runs out.
    •  
      CommentAuthorfostertom
    • CommentTimeMay 21st 2008
     
    I bloody hate diesels, powerful these days yes but once a soggy pudding always a soggy pudding. Anyone calculated the embodied energy of manufacture in triple bypass turbos etc, and generally massiveness due to the higher stresses due to higher combustion pressure reqd to compression-ignite and to produce given power at lower revs?

    As LJKSetright pointed out in Car mag's glory days 30yrs ago, a turbo'd piston engine is very perverse. Make the compression stage much bigger, the combustion stage much smaller and simpler, mount both on the same shaft, and you've got a gas turbine, quantum leap ahead in thermodynamic efficiency.
    •  
      CommentAuthoragu
    • CommentTimeMay 21st 2008
     
    Slightly moving away from cars but still on motoring. I was sitting at a set of traffic lights the other night at about midnight. While I sat there for about 3 minutes waiting for them to change ( I was on a main road, lights to help people from residential roads get on to it) not a single car came out of the other roads. I thought that it must cost local councils a fortune in electricicty to run the lights and was wondering why more aren't put on to part time usage so after say 9pm they are turned off. Does anybody know why this isn't the case?? To my mind not only would councils save money to spend somewhere else ( probably if my town is anything to go by more road works!) but the environementally impact would be huge if this happened on all suitable traffic lights around the country. Have I missed something here because it seems to be a win win situation for all. Less money, less pollution and less time sitting at lights for no reason.
  10.  
    The higher the compression ratio the higher the efficiency, that's why a BMW 520d gives better real mpg than a Prius - plus you don't have to replace the batteries (and all their embodied energy) every 60 - 100k miles.

    If you want to get a handle on the difference in the embodied energy between a diesel and a petrol engine, simply apply the UK energy/gdp ratio which is about 8MJ/pound by my calculations.

    Of course under no circumstances can driving be described as green.

    T
    • CommentAuthorSimonH
    • CommentTimeMay 21st 2008
     
    Best to get your facts from the source not lobby group websites (or newspapers which like slagging of anything to do with improving the environment)...

    Road fuel duty for all fuels is now £0.5235 per litre.

    http://customs.hmrc.gov.uk/channelsPortalWebApp/downloadFile?contentID=HMCE_PROD1_027232

    So diesel is more expensive because of supply chain issues not tax. Most forecourts now sell low sulphur pretol or diesel so the differential has been scrapped.

    The ford focus mentioned in the report is not a hybrid but one of fords new econetic range. They've used low viscosity engine oil, stiffened suspension, changed the engine maps, fitted low rolling resistance types, changed aerodynamics a little and shaved several percent of the fuel consumption.

    VW have Blue motion which is similar.

    BMW have efficient dynamics which also includes stopping the engine when you are stationary and in neutral and a display telling you when to change gear. They also only use the alternator when the engine isn't under load. Upto 15% improvement.

    All this articale really does is show how useless the Official Fuel consumption figures are. And that the CO2 figure is based on the combined cycle so will always be lower than reality. The test is useless becuase is doesn't include air resistance, hills, cold weather, head winds. To make them repeatable and controllable they are carried out in a lab not a real road. I'd have thought it was now possible to conduct tests somewhere like MIRA on a day with windspeed less than 5kph? And temperature between 15-20 degrees and no rain. Although that last one might be hard in the UK ;-) The manufactureres aren't to blame - the EU is for allowing a useless test to be the basis on which all cars are sold. If anyone is working out EU wide emissions based on the existing car stock they better add 50% to their calcs. Or use fuel sold instead!

    http://www.vcacarfueldata.org.uk/information/fuel-consumption-testing-scheme.asp

    I really can't believe that millions of cars are sold based on a 11km / 6.8 mile labaratory test drive!!

    I now just look at the urban figure - as that what you really get. The Extra urban is simply unobtainable - unless you are driving with a tail wind on a flat surface in summer. Combined can be obtained if you do 3 miles of urban followed by 100 miles of motorway driving at 70 mph or less.

    A prius does well for a petrol powered car which has 12% less energy in it's fuel than a diesel. A fuel that is also cheaper to buy. The previous test The Times did was basically all long distance cruising UK to switzerland or something - so the 1.5l prius was never going to get to use it's electric motor. But I came to the conclusion a Toyota Aygo is a better buy - it fits 4 adults, has a boot big enough for 8 carrier bags of shopping (or 4 reusable big ikea blue bags) group 1 insurance, 98 mph max speed, OTR £6700. :-) And you can hire a bigger car if you need to or get a trailer.

    That is until real electric cars are here in a couple of years. All the bits needed are now avaiable - if only to development / integration companies...

    Drive trains
    http://www.uqm.com/products/specsheet.html
    http://www.acpropulsion.com/technology/gen2.htm

    Batteries
    http://www.altairnano.com/markets_energy_systems.html
    http://peswiki.com/index.php/Directory:EEStore (so secretive they don't have a website!?)

    I did consider ripping the 3 litre lump out my 330ci and sticking in something electric powered. But it seems a couple of years too early :-(. But if you have the skills look for an old one with a knackered engine, scuffed seats and turn it into an [almost] lightweight electric racer. You can lose 600kg from the 330ci and the frame is stiff as you could ask. They can be had for under £4000 on autotrader with high mileages.

    Simon.
   
The Ecobuilding Buzz
Site Map    |   Home    |   View Cart    |   Pressroom   |   Business   |   Links   
Logout    

© Green Building Press