Reference
Industrial gas, hydrogen, battery and CO₂ glossary
Short definitions of the terms used across Eldtek's product pages, with links to the page that covers each topic.
- AEM electrolyzer
- An electrolyzer built around an anion exchange membrane. It can use non-precious catalysts such as nickel. Hydrogen gas plants →
- Ammonia cracking
- A high-temperature, catalytic process that splits ammonia (NH₃) into nitrogen and hydrogen. Hydrogen gas plants →
- Balance of plant (BOP)
- Everything in a plant apart from its main unit. For a hydrogen plant it includes power electronics, water treatment, gas drying and purification, compression, storage and safety systems. Hydrogen gas plants →
- BESS (battery energy storage system)
- A complete system that stores electricity in batteries, including the cells, BMS, thermal management, power conversion and controls. Battery energy storage systems →
- BMS (battery management system)
- The electronic controller of a battery. It monitors the cells, protects them, balances their charge, estimates state of charge and health, and communicates with other equipment. Battery energy storage systems →
- Capture rate
- The share of the CO₂ in a gas stream that a capture system removes. CO₂ capture systems →
- Carbon molecular sieve
- An adsorbent with very small pores that lets oxygen enter faster than nitrogen. It is the adsorbent used in PSA nitrogen generators. Nitrogen gas plants →
- CCUS (carbon capture, utilisation and storage)
- The chain of capturing CO₂ from a source, then using it in products or storing it permanently underground. CO₂ capture systems →
- Depth of discharge (DoD)
- The share of a battery's capacity that has been used. A battery with 90% usable depth of discharge delivers 90% of its nominal energy. Battery energy storage systems →
- Electrolyzer
- A device that uses electricity to split water into hydrogen and oxygen. Hydrogen gas plants →
- Flue gas
- The exhaust gas from a furnace, boiler, kiln or engine. It is mainly nitrogen and contains CO₂, water vapour and trace pollutants. CO₂ capture systems →
- Green hydrogen
- Hydrogen made by electrolysis of water using renewable electricity such as solar or wind power. Hydrogen gas plants →
- IP rating
- A code for how well an enclosure resists dust and water. IP65 means dust-tight and protected against water jets. Battery energy storage systems →
- LiFePO₄ (lithium iron phosphate)
- A lithium-ion battery chemistry known for thermal stability and long cycle life. Each cell has a nominal voltage of 3.2 V. Battery energy storage systems →
- Membrane gas separation
- A method that separates gases by the different speeds at which they permeate through a thin membrane. It is used for nitrogen generation and for CO₂ capture. CO₂ capture systems →
- Nm³/h (normal cubic metres per hour)
- A measure of gas flow. It gives the volume of gas delivered each hour at normal reference conditions of 0 °C and 1.013 bar, so flows of different gases can be compared fairly. Nitrogen gas plants →
- PEM electrolyzer
- An electrolyzer built around a proton exchange membrane. It handles high current density and rapid changes in load. Hydrogen gas plants →
- Permeate and retentate
- In a membrane system, the permeate is the gas that passes through the membrane and the retentate is the gas that stays on the feed side. CO₂ capture systems →
- PSA (pressure swing adsorption)
- A process that separates gases by passing them through a bed of adsorbent at high pressure and then releasing the pressure to clear the bed. Two beds work in turn so the output is continuous. Nitrogen gas plants →
- Purity
- The percentage of the product gas that is the wanted gas. Nitrogen at 99.999% purity contains no more than 10 parts per million of other gases. Nitrogen gas plants →
- State of charge (SoC)
- How full a battery is, shown as a percentage of its capacity. Battery energy storage systems →
- VPSA (vacuum pressure swing adsorption)
- A form of PSA that regenerates the adsorbent bed under vacuum. It uses less energy per unit of gas and is mainly used for large oxygen plants. Oxygen gas plants →
- Zeolite
- A crystalline adsorbent that holds back nitrogen from air. It is the adsorbent used in PSA and VPSA oxygen plants. Oxygen gas plants →
Explore
Eldtek solutions
Nitrogen gas plants
PSA and membrane nitrogen generators for inerting, packaging, heat treatment and electronics.
Up to 99.999% N₂View specifications →Oxygen gas plants
PSA and VPSA oxygen plants for steel, glass, pulp and paper and waste-water treatment.
Up to 95% O₂View specifications →Hydrogen gas plants
AEM and PEM electrolyzers, complete turnkey systems and ammonia crackers.
10 – 1,000+ Nm³/hView specifications →CO₂ capture systems
Membrane CO₂ capture for industrial flue gas, with no solvents and a retrofit-ready design.
Up to ~90% captureView specifications →Battery energy storage
From 12 V and 24 V modules to home, industrial and grid-scale systems, each with a BMS.
12 V to MWhView specifications →