Spet0789 wrote:I’m not sure that coal gas (which I was aware of) is what most people have in mind when they think of the modern hydrogen economy. As I said, the problems with leaks arise when hydrogen is at higher pressures. Because of its low specific energy, most of the modern applications do require these pressures.
You might like to read https://funscience.in/calorific-value-o ... industries.
This will tell you that hydrogen has by far the highest calorific value of any gas.
Table of calorific value of fuels
Serial No. Fuel Calorific value
1. Hydrogen 150 KJ/g
2. Methane 55 KJ/g
3. LPG 50 KJ/g
4. Kerosene oil 48 KJ/g
5. Charcoal 33 KJ/g
6. Wood 17 KJ/g
It also has the lowest density, which means that the calorific value of a Nm3 is lower. So 22.4Nm3 of Hydrogen contains just over 2kg, whereas the value for Methane is about 16kg.