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This article provides an overview on Hydrogen cars and how we can generate renewable hydrogen to fuel these cars. There are two well-known brands of Hydrogen based cars already in the market, BMW7 and Honda FCX Clarity models.

BMW7 works on Hydrogen Internal Combustion engine fuelled by Liquid Hydrogen. It is a 6 Liters V12 engine with 191Kw capacity and 390 N of torque. It offers 100km from 50 Liters of Liquid Hydrogen with a density of about 70-80gms/lit and offers 100kms from Gasoline of 16.7 liters. It has a capacity of 170 liters for liquid Hydrogen storage at the rear end of the car. It can run both on Hydrogen as well as on Gasoline. Liquid hydrogen has a better power density but liquefaction is a cryogenic technology and consumes power for liquefaction. The storage tank also is of special construction because Liquid Hydrogen is stored at -253C.

Honda FCX Clarity car is fuel cell car fuelled by compressed Hydrogen gas. It offers 100kms for 3.5 lits of Hydrogen (at 5000 psi pressure with density at 30gms/lit.). It has Hydrogen storage of 3.92kgs kgs with a total mileage of 240miles. Increasing Hydrogen storage gas pressure up to 10000psi, the Hydrogen power density is considerably increased making it comparable with liquid Hydrogen. Moreover fuel cell car is silent while driving because there is no combustion engine.
BMW is able to use their existing conventional internal combustion engine with slight changes suitable for Hydrogen so that they can use their existing infrastructure. But Honda FCX uses proton exchange membrane Fuel cell. It is an electrochemical device that converts Hydrogen into electricity which runs the motor for transmission of power. It is similar to an electric car in which power is stored in batteries and used to drive the motor for transmission. The only difference is the power is generated in Fuel cell car as and when hydrogen is supplied whereas in Electric cars, power is drawn from stored energy from the battery.

We can inject pure Hydrogen along with Gasoline, CNG or LPG to assist the combustion to save fuel consumption up to 30% and to reduce harmful emissions. The conventional gasoline cars can be fitted with water electrolyzer to generate Hydrogen using the car battery. The electrolyzer currently sold in the market is quite different. They generate ‘water gases’ and not pure Hydrogen. They electrolyze water using pulsating DC current which essentially breaks down water into Hydrogen and oxygen molecules. The complete mixture of Hydrogen, Oxygen and undissociated water molecules are injected into fuel manifold of the car. The hydrogen will assist in the process of combustion to certain extend and help save the fuel consumption of gasoline.

Renewable Hydrogen is a potential source for fuelling automobiles. One can use solar panels and simple tap water to generate hydrogen gas and store them under high pressure in cylinders. We will be releasing an eBook in the near future to design a suitable Renewable Hydrogen system and install them at homes and businesses for power generation as well as to fuel two-stroke engines such as scooters and bikes. Initially the book will offer DIY kits to design and install power generation for homes and businesses up to 10Kw capacity electricity generation. We will be conducting trials on two-stroke engines using renewable Hydrogen to get approvals from proper transport authorities for safety and usage on Indian roads.

Hydrogen can be safely handled as long as we take appropriate safety measures as we normally do while handling petroleum products like gasoline or butane gas. It may look like a daunting task to fuel a car with Hydrogen gas but in reality, all necessary equipment and systems are commercially available including High pressure Carbon fiber tanks fully tested and approved.

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