Both types exploit the large liquid-to-gas volume ratio that occurs when liquid transitions to gas phase.
These types of fuels typically use the regulation of gas production and flow to power pistons in an engine.
The pistons move due to the mechanical power transformed from the monitored production of gaseous fuel.
[2] This is determined based on the methane content of the liquefied fuel and any other dissolved gas, and varies as a result of experimental efficiencies.
Gas liquefying processes have been improving over the past decades with the advent of better machinery and control of system heat losses.
[citation needed] Efficiency can be tied to the pure component cascade processes which minimize the overall source to sink temperature difference associated with refrigerant condensing.
All process designers of liquefaction plants using proven technologies face the same challenge: to efficiently cool and condense a mixture with a pure refrigerant.