# Asociación Española del Hidrógeno

• • • #### Tecnologías de Hidrógeno y Pilas de Combustible

HYDROGEN STATISTICS

 1. Density: 0.0899 kg/Nm3 (gas) 0.0708 kg/l (liquid) 2. Heating value - higher: 120 MJ/kg lower: 141.86 MJ/kg 3. Explosion limits: 4.0 – 75.0 % (concentration of H2 in air) 4. Detonation limits: 18.3 – 59.0 % (concentration of H2 in air) 5. Specific heat capacity: Cp=14.199 KJ/(kg·K) Cv=10.074 KJ(kg·K) 6. Diffusion coefficient: 0.61 cm2/s

Compressibility factor according to the following table:

 Pressure (bar) 1 50 100 150 200 250 300 350 Compression factor 1 1.032 1.065 1.089 1.132 1.166 1.201 1.236

 Pressure (bar) 400 500 600 700 800 900 1000 Compression factor 1.272 1.344 1.416 1.489 1.56 1.632 1.702

Example of applying the compressibility factor: 1 50-litre bottle (conventional) at 200 bars of hydrogen at 0ºC contains 0.050 m* 200 / 1.132 = 8.834 Nm3

EQUIVALENTS

HYDROGEN - ENERGY

 Mass H2 (kg) ↔ H2 gas  (Nm3) ↔ H2 líquid1  (litres) ↔ Energy2  (MJ) ↔ Energy2  (kW·h) 1 = 11.12 = 14.12 = 120 = 33.33 0.0899 = 1 = 1.270 = 10,8 = 3,00 0.0708 = 0.788 = 1 = 8.495 = 2.359 0.00833 = 0.0926 = 0.1177 = 1 = 0.278 0.0300 = 0.333 = 0.424 = 3.6 = 1

1 Hydrogen is liquid at atmospheric pressure of less than 20.39 K

2 Based on lower calorific value

HYDROGEN FLOW – ELECTRIC POWER

 Kg/h de H2 ↔ Nm3/h de H2 gas ↔ Litres/h of H2 líquido1 ↔ Power2  (kW) 1 = 11.12 = 14.12 = 33.33 0.0899 = 1 = 1.270 = 3.00 0.0708 = 0.788 = 1 = 2.359 0.00833 = 0.0926 = 0.1177 = 0.278 0.0300 = 0.333 = 0.424 = 1

1 Hydrogen is liquid at atmospheric pressure of less than 20,39 K

2 Based on lower calorific value

Examples:

1.An electrolyser with 85% output that produces 10 Nm3 per hour consumes 35,29 kW (10·3.00/0.85) of power and 8.091 kg of water per hour (10·0.0899·(18/2)).

2.A 10kW fuel cell with total output of 45%  consumes 7.40 Nm3 per hour of H2(10·0.333/0,45) or 0.667 kg/hour of H2 (10·0.030/0.45), and produces 6.00 kg of water per hour (0.667·(18/2)).

COMPARISON OF HYDROGEN WITH OTHER FUELS

Energy value based on lower calorific value

1 kg of H2 ↔ 2.78 kg of gasoline ↔ 2.80 kg of diesel fuel ↔ 2.40 kg of methane ↔ between 2.54 and 3.14 kg of natural gas (depending of the composition of the NG) ↔ 2.59 kg of propane ↔ 2.62 kg of butane ↔ 6.09 kg of methanol

1 litre of liquid H2 ↔ 0.268 litres of gasoline ↔ 0.236 litres of diesel fuel ↔ 0,431 litres of methanol

1 litre of H2 (at 350 bars) ↔ 0.0965 litres of gasoline ↔ 0.0850 litres of diesel fuel ↔ 0.240 litres of methane (at 350 bars) ↔between 0.3 and 0.35 litres of natural gas (at 350 bars) ↔ 0.117 litres of propane (at 350 bars) ↔ 0.127 litres of butane (a 350 bars) ↔ 0.191 litres of methanol

module by camp26

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