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IFEU Heidelberg

23

Besides these two in depth studies ([EBERLE 2000] & [WALLENTOWITZ et al. 1996]) other values can be found in the relevant literature ([BUXMANN & GEDIGA 1998], [VW AG 2002], [REPPE et al.1998], [KIEFER et al. 1998] & [PETERSEN 2000]). These sources (Tab. 3), however, are rather estimates and rules of thumb which are, for example, used for life-cycle assessment. The origin and validity of these values is not specified in the respective sources.

Source

Specific fuel sa vings [l/(100 km*100 kg)]

Relative energy Savings [%]

[EBERLE 2000] (NEDC Test) without adjusted rear axle transmission

0.134

2.11)

Tab. 3: Overview of specific and relative fuel and energy savings for passenger cars

[EBERLE 2000] (NEDC Simulation)

0.049 - 0.139

without adjusted rear axle transmission

[EBERLE 2000] (NEDC Test) with adjusted rear axle transmission

0.409

6.41)

[EBERLE 2000] (NEDC Simulation) with adjusted rear axle transmission

0.343 - 0.481

[EBERLE 2000] (NEDC Simulation for diesel vehicles) with adjusted rear axle transmission

0.29 - 0.33

[WALLENTOWITZ et al. 1996] (NEDC Tests and Simulations)

0.1 - 0.25

1.371) - 3.71)

[BUXMANN & GEDIGA 1998] Estimate

0.25 - 0.5

1)

[VW AG 2002] Estimate [REPPE et al.1998] Estimate [KIEFER et al. 1998] Estimate [PETERSEN 2000] Estimate IFEU calculation based on the source

4 4 4.5 4

IFEU 2003

A relative value of about 4 % fuel savings for a 10 % weight reduction is often stated as rule of thumb and reflects a commonly accepted coefficient of weight induced energy savings for passenger cars. While the relative energy savings for a weight reduction without any modifications are in the range of 2% - 4 %, a much higher value of over 6 % can be achieved with a modification of the rear axle transmission. [EBERLE 2000] is the only source providing data for weight induced fuel savings for vehicles with a modified rear axle transmission, meaning data with the performance of the original vehicle maintained.

As can be seen in Chart 7 and Chart 8, absolute fuel savings in l/ (100 km*100 kg) bet- ter represent the fuel savings than relative numbers due to the independence of fuel savings of the absolute weight level of the vehicle. Therefore, we assume 0.35 l spe- cific fuel savings for gasoline and 0.3 l specific fuel savings for diesel cars per

Energy savings by light-weighting

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