The EPA’s Electric Vehicle Mileage Fraud Forbes

8 Мар 2014 | Author: | Комментарии к записи The EPA’s Electric Vehicle Mileage Fraud Forbes отключены


August Electric Vehicle

The EPA’s Electric Vehicle Fraud

Update: I wanted to a brief summary of what you find below. In short, the wants an equivilent MPG standard for cars that goes to the power plant to estimate amount of fossil fuels be burned to create the electricity fills the batteries of an electric The EPA’s methodology is flawed it assumes perfect conversion of the energy in fossil fuels to an assumption that violates the law of thermodynamics. The Department of Energy has a methodology that computes vehicle equivalent mileage on real world power efficiencies and fuel mixes, also taking into energy used for refining for traditional cars.

Using better DOE methodology, we get MPGe’s for cars that are barely 1/3 of the EPA

In a parking lot near Detroit, Motors is accumulating Chevy They cannot yet be sold to the because the Environmental Protection (EPA) has not yet delivered the required sticker for the window. We can, get a preview of how the EPA may complete this tricky task from the numbers they recently to the all-electric Nissan Leaf.

The Leaf’s numbers make it that this Administration is to resort to accounting fraud to its automotive agenda.

The traditional for automobile efficiency is miles per (MPG) of gasoline used. But does MPG even mean for a that doesn’t burn fuel? Most of us would that the Leaf certainly use fuel — after all, must create the electricity, and in the US is generally some sort of fuel.

So theoretically we should be to create an MPG equivalent, or MPGe for to measure the fossil fuel use of vehicles.

For more than a within the EPA and the Department of Energy a number of different approaches to problem have been With the release of the numbers for the Leaf, we now know what the EPA is taking, and results are depressing for of us who would like to see transparency and to science in the Administration. This has a huge intellectual investment in vehicles and financial investment in the Volt.

Like a shady company to pump up their stock by a series of highly questionable conventions, the EPA has chosen an approach grossly overestimates the MPGe of vehicles.

The Nissan Leaf was at 99 MPGe. To reach this the EPA created a conversion factor a quantity of electric energy, in kilowatt-hours (KwH) and a volume of measured in gallons. They did be dividing the potential energy or value of a gallon of gasoline BTUs) by the energy in a KwH of electricity BTUs) to get a conversion factor of gallons per KwH.

Using factor, they can convert per KwH of electricity in an electric vehicle to an that is supposedly comparable to traditional vehicles.

The problem is using this methodology, the EPA is apples to oranges. The single energy loss in fossil combustion is the step when we try to useful mechanical work (ie a driveshaft in a car or a generator in a power from the heat of the fuel’s Even the most efficient tend to capture only of the potential energy of the fuel.

There can be other losses in the and distribution chain, but this is by far the

The EPA is therefore giving the electric a huge break. When we mpg on a traditional car, the efficiency a big hit due to the conversion efficiencies and heat in combustion. The same thing when we generate electricity, but the car in this measurement is not being with these losses, though we know they occur in the system.

Lets an analogy. We want to measure how two different workers can install a in a customer’s apartment. In both the customer lives in a fourth walkup. The first installer the refrigerator has been left on the

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He has to spend much of his time to haul the appliance up four of stairs. After that, speaking, the installation is a breeze. The installer finds his refrigerator has been delivered right to the door on the fourth floor.

He brings the unit inside and the installation.

So who is a better installer? If one looks at the installer’s time, the person looks orders of better. But we know that he is faster because he offloaded of the work on the delivery guys. If we to look at the total time of the person plus the installer, probably find they much closer in their

The same is true of the mileage — by the EPA’s metric, the electric looks much better the traditional vehicle, but that is because someone else at the plant had to do the really hard bit of that the traditional auto do itself. Having electricity than gasoline in the tank is the of starting with the refrigerator at the top than the bottom of the stairs.

An apples to apples comparison, would compare the traditional MPG with the Leaf’s miles per of gasoline (or gasoline equivalent) would have to be burned to the electricity it uses. Incredibly, the DOE established and published such a in a rules-making process way back in Administration. The standard, called to wheels,” adds a couple new to the MPGe calculation we discussed

First, the DOE looked at the electrical efficiency, and determined that 32.8% of the potential energy in the fuel becomes electric in the average US power plant, it further reduced to 30.3% to for transmission losses. However, realized it was unfair to charge vehicles for these losses also charging gasoline-powered for the energy cost of refining and distribution. They calculated as adding 20% to the energy it takes to run a car, but rather than existing MPG standards by this they instead gave a back to electric vehicles.

The electric production and distribution was increased to a final adjustment of 36.5%. This means the conversion factor discussed of 33.7 gallons/KwH must be by 36.5% to get a true apples to MPGe figure.

The end result is startling. Using the apples to apples methodology, the of the Nissan Leaf is not 99 but 36! Now, 36 is a mileage number, but it is pretty compared to the overblown expectations for vehicles, and is actually lower the EPA calculated mileage of a number of and even a few traditional gasoline-powered like the Honda CR-Z.

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