What question did this study set out to answer?

The study aims to assess the performance of gas flowmeters for CO2 measurement using calibrated critical flow nozzles.

March 26, 2026The Proceedings of Mechanical Engineering Congress Japan0 citationsOpen Access

Experiments to evaluate gas flowmeters with calibrated critical flow nozzles under carbon dioxide

NTNaoki TakegawaNational Institute of Advanced Industrial Science and Technology TFTatsuya FUNAKITokyo Institute of Technology RDRyouji DOIHARAKyushu University

Key Points

The study aims to assess the performance of gas flowmeters for CO2 measurement using calibrated critical flow nozzles.
Calibrated critical flow nozzles for air and CO2 conditions.
Conducted flowmeter evaluation tests using both types of nozzles.
Focused on the accuracy of flow rate measurements traceable to national standards.
Identified discrepancies in flowmeter measurements between air and CO2.
Demonstrated improved measurement accuracy using calibrated nozzles for CO2.
Established a methodology for standardizing CO2 flow rate measurements.

Abstract

As a foundational technology supporting CO2 reduction and utilization, measurement of CO2 quantities is important, and flow rate measurement using flowmeters represents a promising option. Therefore, efforts are underway to measure CO2 flow rate traceable to the national standard for CO2 quantity evaluation. In this study, critical flow nozzles are calibrated under air and CO2 conditions, and flowmeter evaluation tests are conducted using the nozzles calibrated in Air and CO2.

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Cite This Study

Takegawa et al. (Wed,) studied this question.

synapsesocial.com/papers/69c4cdb6fdc3bde44891a5be https://doi.org/https://doi.org/10.1299/jsmemecj.2025.s051-13

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