Forurener krydstogtskibe så meget?

Seniorforsker ved Institut for Mekanisk Teknologi på DTU, Hans Otto Holmegaard Kristensen, undrer sig stærkt over de beregninger der ligger bag artiklen: Krydstogtskibe forurener København - der med Politiken som kilde, blev bragt søndag.

Holmegaard skriver til redaktionen, at han er lidt rystet over de i artiklen anførte tal. Hans Otto Holmegaard Kristensen ser regnestykket således:

Fra København til Milano er distancen 1160 km, hvilket medfører at en diesel dreven personbil vil forbruge mellem 60 og 70 kg olie. Lad mig bruge det laveste tal 60 kg.

10000 biler vil forbruge i alt 10000 x 60 kg = 600000 kg olie = 600 tons olie svarende til forbruget for et krydstogtskibs generering af el i 10 timer iflg. de anførte kilder, dvs. et forbrug på 60 tons olie per time.

En dieselgenerator bruger ca. 0.21 kg olie per kW time dvs. skibet har en generator effekt i drift svarende til 60000/0.21 = 286000 kW !!!

Holmegaard mener, at der mindst er tale om en faktor 10 fejl i regnestykket, og at det derfor ikke bør stå uimodsagt.

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