Measurement uncertainty tool for HRS dispensers

M. MacDonald, N. Glen, M. A. de Huu, R. Maury, S. Rønneberg, A. Wiener

Abstract

Verifications of hydrogen refuelling stations have shown that variations in the station design and operation can greatly influence accuracy at the dispenser, and there are sources of error unrelated to the flow meter which if uncorrected make it difficult to achieve the accuracy requirements of OIML R-139. To improve dissemination of knowledge in this area, an interactive measurement uncertainty tool has been developed which allows the user to specify a range of different station configurations and filling scenarios to estimate the resulting errors at the dispenser. This is intended to serve as a basis for HRS manufacturers to improve HRS designs with respect to billing accuracy and to assist notified bodies in understanding uncertainty contributions from an HRS and the corrections required. This paper describes the initial version of the HRS uncertainty tool, explaining the inputs required from the user, the sources of measurement uncertainty considered, how the flow meter behaviour is modelled, and which calculations are implemented.

Keywords

Hydrogen; Measurement uncertainty; Refuelling station; HRS; FCEV

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IMEKO-TC9-2019-158.pdf

DOI

10.21014/tc9-2022.158

IMEKO TC

TC9 - Flow Measurement

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