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English   Alternative drive systems in Buses of Daimler AG – Part II
30.12.2008 von admin


A 1979 brochure shows an again modified vehicle with a 78-hp engine and now three hydride storage tanks, a 55 kilogram magnesium2-nickel tank and two titanium-iron tanks weighing 93 and 98 kilograms, respectively. Insulation included, the total weight of all three storage units added up to 400 kilograms. The gasoline equivalent of the stored hydrogen quantity of 5.5 kilograms was 20.5 liters.


Mercedes-Benz City Bus: eco-friendly hydrogen drive, 1979.

A diagram explains the layout: The waste-gas-heated high-temperature hydride tank also serves as a stationary heater that delivers an output of eight to nine kilowatts. A downstream low-temperature hydride tank utilizes the residual heat of the exhaust flow. Another low-temperature hydride tank is connected to a heat exchanger and serves also as a cooling unit of the air conditioner, delivering three to four kilowatts.

“In a hydrogen drive system (sponsored by the Federal Ministry for Research and Technology) with a hydride storage tank, a large part of the engine heat is accumulated in the hydride when the hydrogen is extracted,” the brochure explains. “At the hydrogen filling station, this stored energy is recovered when the storage unit is recharged. Measurements by Daimler-Benz show that as much as 80 percent of the energy in the exhaust gas of a hydrogen-burning engine can be reused.”


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