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Flammability range of gas could be defined in term of its lower flammability limit (LFL) and upper flammability limit (UFL). The LFL of a gas is the lower gas concentration that still support a self-propagating flame when mixed with air and ignited. Below the LFL, there is not enough fuel to support the combustion reaction. The UFL of a gas is the upper gas concentration that still support a self-propagating flame when mixed with air and ignited. Above the UFL, there is not enough oxygen to support the combustion reaction. Continue Reading »

Tags: Hydrogen

Fuel cells are electro-chemical device that convert chemical energy on hydrogen into DC electrical energy. Its mainly different with battery, battery consume DC electric energy with long times when charging and generate DC electric energy when discharging. Battery just device to storing electric energy with limitation capability. Fuel cells just need hydrogen gas which flow to electrode to generate DC electric energy. Its similar with internal combustion engine that need fossil fuel to generate mechanical energy then moving the generator to produce the electric energy. The different with internal combustion engine is fuel cells not release carbon-dioxide emission, just water vapour. Fuel cells with hydrogen fuel very environmental-friendly. Continue Reading »

Tags: Fuel Cell