Liquid Hydrogen: Managing the Silent Losses That Shape the Future of Clean Energy

Abstract

Liquid Hydrogen (LH₂) is becoming a strategic energy vector for long‑distance maritime transport, aerospace applications, and high‑density energy storage. Yet, its extreme cryogenic nature (–253 °C, only 20 ˚C above absolute zero) makes it inherently unstable. It tends to continuously generate boil‑off gas (BOG) that puts a threat both on safety and commercial efficiency. This article examines the integration of high‑efficiency turboexpanders into future Hydrogen Carriers as a method to manage BOG and with that to keep under control the tank pressure and reduce energy losses. Using recent industrial data and thermodynamic modeling, the study shows that turboexpander‑based reliquefaction plants can reduce BOG by 30–45%, lower the liquid temperature by 1.5–2.2 °C per cycle, and enable zero‑venting transoceanic voyages. The findings position BOG management not as an auxiliary function but as the central engineering challenge that will determine the suitability of practical Hydrogen use.