Metrology for Hydrogen Vehicles (MetroHyVe)
TÜV SÜD NEL is collaborating with various companies and National Measurement Institutes on the EMPIR Joint Research Project 'Metrology for Hydrogen Vehicles'.
Four key metrology challenges which will impede the uptake of hydrogen fuel cell vehicles were identified through consultation with vehicle manufacturers, hydrogen gas producers, standardisation bodies and operators of hydrogen refuelling stations. The following metrology challenges are addressed by MetroHyVe:
- Flow metering
- Hydrogen quality assurance
- Hydrogen quality control
As custodian of the UK's National Standards for Flow Measurement, NEL is well placed to provide the facilities, knowledge and experience required to develop new flow metering solutions.
Flow Metering Challenges
No methodology currently exists for calibrating flow meters for hydrogen provided by refueling stations. Flow metrology is very challenging at the typical operating conditions, with pressures of up to 875 bar and temperatures ranging from -40 Â°C to 85 Â°C. There are no flow calibration laboratories currently available which operate with high pressure hydrogen.
NEL will investigate whether the flowmeters installed in hydrogen refuelling stations can be calibrated using alternative gases such as nitrogen and air. This would allow cost effective calibrations using one of many existing gas flow calibration laboratories.
Several of the commercially available flowmeters designed for metering in hydrogen refuelling stations will be tested in the NEL high pressure gas flow facility using nitrogen at flowrates and densities equivalent to field conditions. NEL will be working closely with METAS, RISE and Cesame-Exadebit to complete this series of tests. The effect of temperature and pressure on the performance of these meters will also be investigated.
The flow meters which are first calibrated in nitrogen will then be installed in a hydrogen refuelling station and tested against gravimetric flow standards developed in the project. The performance of flowmeters which have completed the full experimental programme will inform the development of standard methods of verification, which can be used to meet the accuracy requirements expected from an end user and mandated by National and European legislation.
A full description of the MetroHyVe project, stakeholders and consortium members is provided on the official website: