pravin nitnaware
Pune University, Mechanical Engineering, Faculty Member
CNG and compressed hydrogen are compared to illustrate why CNG, but not compressed hydrogen, is a viable alternative vehicle fuel. It is shown that natural gas has a greater energy content per mole than hydrogen and that more moles of... more
CNG and compressed hydrogen are compared to illustrate why CNG, but not compressed hydrogen, is a viable alternative vehicle fuel. It is shown that natural gas has a greater energy content per mole than hydrogen and that more moles of natural gas than hydrogen may be stored in a given volume under identical conditions. Natural gas stored at 20.78 MPa (3000 psig) and 21.1°C (70°F) contains five times as much energy as hydrogen stored under the same conditions. Natural gas stored in a representative size CNG cylinder provides a range of about 100 km, while hydrogen in the same cylinder would provide a range of only 26 km, even assuming 30% greater efficiency from the hydrogen-fueled engine.
